diff --git a/dist/base-system.d.ts b/dist/base-system.d.ts
index 4837827..20ac2c0 100644
--- a/dist/base-system.d.ts
+++ b/dist/base-system.d.ts
@@ -35,7 +35,7 @@ export declare class BaseSystem<TBody extends Body = Body> extends RBush<TBody>
      */
     createPolygon(position: PotentialVector, points: PotentialVector[], options?: BodyOptions): Polygon;
     /**
-     * re-insert body into collision tree and update its aabb
+     * re-insert body into collision tree and update its bbox
      * every body can be part of only one system
      */
     insert(body: TBody): RBush<TBody>;
diff --git a/dist/base-system.js b/dist/base-system.js
index 2c51640..31ab232 100644
--- a/dist/base-system.js
+++ b/dist/base-system.js
@@ -63,7 +63,7 @@ class BaseSystem extends model_1.RBush {
         return polygon;
     }
     /**
-     * re-insert body into collision tree and update its aabb
+     * re-insert body into collision tree and update its bbox
      * every body can be part of only one system
      */
     insert(body) {
@@ -81,8 +81,6 @@ class BaseSystem extends model_1.RBush {
         body.minY = body.bbox.minY - body.padding;
         body.maxX = body.bbox.maxX + body.padding;
         body.maxY = body.bbox.maxY + body.padding;
-        // set system for later body.system.updateBody(body)
-        body.system = this;
         // reinsert bounding box to collision tree
         return super.insert(body);
     }
diff --git a/dist/bodies/circle.d.ts b/dist/bodies/circle.d.ts
index 782ab8e..427848f 100644
--- a/dist/bodies/circle.d.ts
+++ b/dist/bodies/circle.d.ts
@@ -1,6 +1,6 @@
 import { BBox } from "rbush";
 import { Circle as SATCircle } from "sat";
-import { BaseSystem } from "../base-system";
+import { System } from "../system";
 import { BodyGroup, BodyOptions, BodyProps, BodyType, PotentialVector, SATVector, Vector } from "../model";
 /**
  * collider - circle
@@ -53,7 +53,7 @@ export declare class Circle extends SATCircle implements BBox, BodyProps {
     /**
      * reference to collision system
      */
-    system?: BaseSystem;
+    system?: System;
     /**
      * was the polygon modified and needs update in the next checkCollision
      */
diff --git a/dist/demo/demo.js b/dist/demo/demo.js
index 4b22658..42d4b55 100644
--- a/dist/demo/demo.js
+++ b/dist/demo/demo.js
@@ -2124,7 +2124,7 @@ class BaseSystem extends model_1.RBush {
         return polygon;
     }
     /**
-     * re-insert body into collision tree and update its aabb
+     * re-insert body into collision tree and update its bbox
      * every body can be part of only one system
      */
     insert(body) {
@@ -2142,8 +2142,6 @@ class BaseSystem extends model_1.RBush {
         body.minY = body.bbox.minY - body.padding;
         body.maxX = body.bbox.maxX + body.padding;
         body.maxY = body.bbox.maxY + body.padding;
-        // set system for later body.system.updateBody(body)
-        body.system = this;
         // reinsert bounding box to collision tree
         return super.insert(body);
     }
@@ -3319,7 +3317,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.BodyGroup = exports.getGroup = exports.BodyType = exports.SATCircle = exports.SATPolygon = exports.SATVector = exports.Response = exports.RBush = exports.isSimple = exports.bin2dec = void 0;
+exports.BodyGroup = exports.getGroup = exports.BodyType = exports.SATCircle = exports.SATPolygon = exports.SATVector = exports.Response = exports.RBush = exports.isSimple = void 0;
 const rbush_1 = __importDefault(__webpack_require__(/*! rbush */ "./node_modules/rbush/rbush.min.js"));
 Object.defineProperty(exports, "RBush", ({ enumerable: true, get: function () { return rbush_1.default; } }));
 const sat_1 = __webpack_require__(/*! sat */ "./node_modules/sat/SAT.js");
@@ -3327,13 +3325,6 @@ Object.defineProperty(exports, "SATCircle", ({ enumerable: true, get: function (
 Object.defineProperty(exports, "SATPolygon", ({ enumerable: true, get: function () { return sat_1.Polygon; } }));
 Object.defineProperty(exports, "Response", ({ enumerable: true, get: function () { return sat_1.Response; } }));
 Object.defineProperty(exports, "SATVector", ({ enumerable: true, get: function () { return sat_1.Vector; } }));
-/**
- * binary string to decimal number
- */
-function bin2dec(binary) {
-    return Number(`0b${binary}`.replace(/\s/g, ""));
-}
-exports.bin2dec = bin2dec;
 var poly_decomp_es_1 = __webpack_require__(/*! poly-decomp-es */ "./node_modules/poly-decomp-es/dist/poly-decomp-es.js");
 Object.defineProperty(exports, "isSimple", ({ enumerable: true, get: function () { return poly_decomp_es_1.isSimple; } }));
 /**
@@ -3482,6 +3473,16 @@ class System extends base_system_1.BaseSystem {
          */
         this.response = new model_1.Response();
     }
+    /**
+     * re-insert body into collision tree and update its bbox
+     * every body can be part of only one system
+     */
+    insert(body) {
+        const insertResult = super.insert(body);
+        // set system for later body.system.updateBody(body)
+        body.system = this;
+        return insertResult;
+    }
     /**
      * separate (move away) bodies
      */
@@ -3524,6 +3525,16 @@ class System extends base_system_1.BaseSystem {
         };
         return (0, optimized_1.some)(bodies, checkCollision);
     }
+    /**
+     * callback all bodies in area
+     */
+    checkArea(area, callback = utils_1.returnTrue, response = this.response) {
+        const bodies = this.search(area);
+        const checkOne = (body) => {
+            return this.checkOne(body, callback, response);
+        };
+        return (0, optimized_1.some)(bodies, checkOne);
+    }
     /**
      * check all bodies collisions with callback
      */
@@ -3630,7 +3641,7 @@ exports.System = System;
 "use strict";
 
 Object.defineProperty(exports, "__esModule", ({ value: true }));
-exports.returnTrue = exports.cloneResponse = exports.drawBVH = exports.drawPolygon = exports.dashLineTo = exports.getSATTest = exports.getBounceDirection = exports.mapArrayToVector = exports.mapVectorToArray = exports.clonePointsArray = exports.checkAInB = exports.areSameGroup = exports.intersectAABB = exports.notIntersectAABB = exports.bodyMoved = exports.extendBody = exports.clockwise = exports.distance = exports.ensurePolygonPoints = exports.ensureVectorPoint = exports.createBox = exports.createEllipse = exports.rad2deg = exports.deg2rad = exports.RAD2DEG = exports.DEG2RAD = void 0;
+exports.bin2dec = exports.returnTrue = exports.cloneResponse = exports.drawBVH = exports.drawPolygon = exports.dashLineTo = exports.getSATTest = exports.getBounceDirection = exports.mapArrayToVector = exports.mapVectorToArray = exports.clonePointsArray = exports.checkAInB = exports.areSameGroup = exports.intersectAABB = exports.notIntersectAABB = exports.bodyMoved = exports.extendBody = exports.clockwise = exports.distance = exports.ensurePolygonPoints = exports.ensureVectorPoint = exports.createBox = exports.createEllipse = exports.rad2deg = exports.deg2rad = exports.RAD2DEG = exports.DEG2RAD = void 0;
 const sat_1 = __webpack_require__(/*! sat */ "./node_modules/sat/SAT.js");
 const intersect_1 = __webpack_require__(/*! ./intersect */ "./src/intersect.ts");
 const model_1 = __webpack_require__(/*! ./model */ "./src/model.ts");
@@ -3917,6 +3928,13 @@ function returnTrue() {
     return true;
 }
 exports.returnTrue = returnTrue;
+/**
+ * binary string to decimal number
+ */
+function bin2dec(binary) {
+    return Number(`0b${binary}`.replace(/\s/g, ""));
+}
+exports.bin2dec = bin2dec;
 
 
 /***/ }),
@@ -4030,34 +4048,34 @@ module.exports.height = height;
   \****************************/
 /***/ ((module, __unused_webpack_exports, __webpack_require__) => {
 
-const { BodyGroup } = __webpack_require__(/*! ../model */ "./src/model.ts")
-const { System } = __webpack_require__(/*! ../system */ "./src/system.ts")
-const { getBounceDirection } = __webpack_require__(/*! ../utils */ "./src/utils.ts")
-const { width, height, loop } = __webpack_require__(/*! ./canvas */ "./src/demo/canvas.js")
-const seededRandom = (__webpack_require__(/*! random-seed */ "./node_modules/random-seed/index.js").create)("@Prozi").random
+const { BodyGroup } = __webpack_require__(/*! ../model */ "./src/model.ts");
+const { System } = __webpack_require__(/*! ../system */ "./src/system.ts");
+const { getBounceDirection } = __webpack_require__(/*! ../utils */ "./src/utils.ts");
+const { width, height, loop } = __webpack_require__(/*! ./canvas */ "./src/demo/canvas.js");
+const seededRandom = (__webpack_require__(/*! random-seed */ "./node_modules/random-seed/index.js").create)("@Prozi").random;
 
 function random(min, max) {
-  return Math.floor(seededRandom() * max) + min
+  return Math.floor(seededRandom() * max) + min;
 }
 
 class Stress {
   constructor(count = 2000) {
-    this.size = Math.sqrt((width * height) / (count * 50))
-
-    this.physics = new System(5)
-    this.bodies = []
-    this.polygons = 0
-    this.boxes = 0
-    this.circles = 0
-    this.ellipses = 0
-    this.lines = 0
-    this.lastVariant = 0
-    this.count = count
-    this.bounds = this.getBounds()
-    this.enableFiltering = false
+    this.size = Math.sqrt((width * height) / (count * 50));
+
+    this.physics = new System(5);
+    this.bodies = [];
+    this.polygons = 0;
+    this.boxes = 0;
+    this.circles = 0;
+    this.ellipses = 0;
+    this.lines = 0;
+    this.lastVariant = 0;
+    this.count = count;
+    this.bounds = this.getBounds();
+    this.enableFiltering = false;
 
     for (let i = 0; i < count; ++i) {
-      this.createShape(!random(0, 20))
+      this.createShape(!random(0, 20));
     }
 
     this.legend = `<div><b>Total:</b> ${count}</div>
@@ -4071,10 +4089,10 @@ class Stress {
         <input id="filtering" type="checkbox"/> Enable Collision Filtering
       </label>
     </div>
-    `
+    `;
 
-    this.lastTime = Date.now()
-    this.updateBody = this.updateBody.bind(this)
+    this.lastTime = Date.now();
+    this.updateBody = this.updateBody.bind(this);
 
     // observer #debug & add filtering checkbox event
     const observer = new window.MutationObserver((mutations) => {
@@ -4083,20 +4101,20 @@ class Stress {
           if (node.id == "debug") {
             document
               .querySelector("#filtering")
-              .addEventListener("change", () => this.toggleFiltering())
-            observer.disconnect()
+              .addEventListener("change", () => this.toggleFiltering());
+            observer.disconnect();
           }
-        })
-      })
-    })
+        });
+      });
+    });
     observer.observe(document.querySelector("body"), {
       subtree: false,
       childList: true,
-    })
+    });
 
     this.start = () => {
-      loop(this.update.bind(this))
-    }
+      loop(this.update.bind(this));
+    };
   }
 
   getBounds() {
@@ -4113,152 +4131,152 @@ class Stress {
       this.physics.createBox({ x: 0, y: 0 }, 10, height, {
         isStatic: true,
       }),
-    ]
+    ];
   }
 
   toggleFiltering() {
-    this.enableFiltering = !this.enableFiltering
-    this.physics.clear()
-    this.bodies.length = 0
-    this.polygons = 0
-    this.boxes = 0
-    this.circles = 0
-    this.ellipses = 0
-    this.lines = 0
-    this.lastVariant = 0
-    this.bounds = this.getBounds()
+    this.enableFiltering = !this.enableFiltering;
+    this.physics.clear();
+    this.bodies.length = 0;
+    this.polygons = 0;
+    this.boxes = 0;
+    this.circles = 0;
+    this.ellipses = 0;
+    this.lines = 0;
+    this.lastVariant = 0;
+    this.bounds = this.getBounds();
     for (let i = 0; i < this.count; ++i) {
-      this.createShape(!random(0, 20))
+      this.createShape(!random(0, 20));
     }
   }
 
   update() {
-    const now = Date.now()
-    this.timeScale = Math.min(1000, now - this.lastTime) / 60
-    this.lastTime = now
-    this.bodies.forEach(this.updateBody)
+    const now = Date.now();
+    this.timeScale = Math.min(1000, now - this.lastTime) / 60;
+    this.lastTime = now;
+    this.bodies.forEach(this.updateBody);
   }
 
   updateBody(body) {
-    body.setAngle(body.angle + body.rotationSpeed * this.timeScale, false)
+    body.setAngle(body.angle + body.rotationSpeed * this.timeScale, false);
 
     if (seededRandom() < 0.05 * this.timeScale) {
-      body.targetScale.x = 0.5 + seededRandom()
+      body.targetScale.x = 0.5 + seededRandom();
     }
 
     if (seededRandom() < 0.05 * this.timeScale) {
-      body.targetScale.y = 0.5 + seededRandom()
+      body.targetScale.y = 0.5 + seededRandom();
     }
 
     if (Math.abs(body.targetScale.x - body.scaleX) > 0.01) {
       const scaleX =
         body.scaleX +
-        Math.sign(body.targetScale.x - body.scaleX) * 0.02 * this.timeScale
+        Math.sign(body.targetScale.x - body.scaleX) * 0.02 * this.timeScale;
       const scaleY =
         body.scaleY +
-        Math.sign(body.targetScale.y - body.scaleY) * 0.02 * this.timeScale
+        Math.sign(body.targetScale.y - body.scaleY) * 0.02 * this.timeScale;
 
-      body.setScale(scaleX, scaleY, false)
+      body.setScale(scaleX, scaleY, false);
     }
 
     // as last step update position, and bounding box
     body.setPosition(
       body.x + body.directionX * this.timeScale,
-      body.y + body.directionY * this.timeScale
-    )
+      body.y + body.directionY * this.timeScale,
+    );
 
     // separate + bounce
-    this.bounceBody(body)
+    this.bounceBody(body);
   }
 
   bounceBody(body) {
-    const bounces = { x: 0, y: 0 }
+    const bounces = { x: 0, y: 0 };
     const addBounces = ({ overlapV: { x, y } }) => {
-      bounces.x += x
-      bounces.y += y
-    }
+      bounces.x += x;
+      bounces.y += y;
+    };
 
-    this.physics.checkOne(body, addBounces)
+    this.physics.checkOne(body, addBounces);
 
     if (bounces.x || bounces.y) {
-      const size = 0.5 * (body.scaleX + body.scaleY)
+      const size = 0.5 * (body.scaleX + body.scaleY);
       const bounce = getBounceDirection(body, {
         x: body.x + bounces.x,
         y: body.y + bounces.y,
-      })
+      });
 
       bounce.scale(body.size).add({
         x: body.directionX * size,
         y: body.directionY * size,
-      })
+      });
 
-      const { x, y } = bounce.normalize()
+      const { x, y } = bounce.normalize();
 
-      body.directionX = x
-      body.directionY = y
-      body.rotationSpeed = (seededRandom() - seededRandom()) * 0.1
+      body.directionX = x;
+      body.directionY = y;
+      body.rotationSpeed = (seededRandom() - seededRandom()) * 0.1;
 
-      body.setPosition(body.x - bounces.x, body.y - bounces.y)
+      body.setPosition(body.x - bounces.x, body.y - bounces.y);
     }
   }
 
   createShape(large) {
-    const minSize = this.size * 1.0 * (large ? seededRandom() + 1 : 1)
-    const maxSize = this.size * 1.25 * (large ? seededRandom() * 2 + 1 : 1)
-    const x = random(0, width)
-    const y = random(0, height)
-    const direction = (random(0, 360) * Math.PI) / 180
+    const minSize = this.size * 1.0 * (large ? seededRandom() + 1 : 1);
+    const maxSize = this.size * 1.25 * (large ? seededRandom() * 2 + 1 : 1);
+    const x = random(0, width);
+    const y = random(0, height);
+    const direction = (random(0, 360) * Math.PI) / 180;
     const options = {
       isCentered: true,
       padding: (minSize + maxSize) * 0.2,
-    }
+    };
 
-    let body
-    let variant = this.lastVariant++ % 5
+    let body;
+    let variant = this.lastVariant++ % 5;
 
     switch (variant) {
       case 0:
         if (this.enableFiltering) {
-          options.group = BodyGroup.Circle
+          options.group = BodyGroup.Circle;
         }
         body = this.physics.createCircle(
           { x, y },
           random(minSize, maxSize) / 2,
-          options
-        )
+          options,
+        );
 
-        ++this.circles
-        break
+        ++this.circles;
+        break;
 
       case 1:
-        const width = random(minSize, maxSize)
-        const height = random(minSize, maxSize)
+        const width = random(minSize, maxSize);
+        const height = random(minSize, maxSize);
         if (this.enableFiltering) {
-          options.group = BodyGroup.Ellipse
-          console.log()
+          options.group = BodyGroup.Ellipse;
+          console.log();
         }
-        body = this.physics.createEllipse({ x, y }, width, height, 2, options)
+        body = this.physics.createEllipse({ x, y }, width, height, 2, options);
 
-        ++this.ellipses
-        break
+        ++this.ellipses;
+        break;
 
       case 2:
         if (this.enableFiltering) {
-          options.group = BodyGroup.Box
+          options.group = BodyGroup.Box;
         }
         body = this.physics.createBox(
           { x, y },
           random(minSize, maxSize),
           random(minSize, maxSize),
-          options
-        )
+          options,
+        );
 
-        ++this.boxes
-        break
+        ++this.boxes;
+        break;
 
       case 3:
         if (this.enableFiltering) {
-          options.group = BodyGroup.Line
+          options.group = BodyGroup.Line;
         }
         body = this.physics.createLine(
           { x, y },
@@ -4266,15 +4284,15 @@ class Stress {
             x: x + random(minSize, maxSize),
             y: y + random(minSize, maxSize),
           },
-          options
-        )
+          options,
+        );
 
-        ++this.lines
-        break
+        ++this.lines;
+        break;
 
       default:
         if (this.enableFiltering) {
-          options.group = BodyGroup.Polygon
+          options.group = BodyGroup.Polygon;
         }
         body = this.physics.createPolygon(
           { x, y },
@@ -4284,28 +4302,28 @@ class Stress {
             { x: random(minSize, maxSize), y: -random(minSize, maxSize) },
             { x: -random(minSize, maxSize), y: -random(minSize, maxSize) },
           ],
-          options
-        )
+          options,
+        );
 
-        ++this.polygons
-        break
+        ++this.polygons;
+        break;
     }
 
     // set initial rotation angle direction
-    body.rotationSpeed = (seededRandom() - seededRandom()) * 0.1
-    body.setAngle((random(0, 360) * Math.PI) / 180)
+    body.rotationSpeed = (seededRandom() - seededRandom()) * 0.1;
+    body.setAngle((random(0, 360) * Math.PI) / 180);
 
-    body.targetScale = { x: 1, y: 1 }
-    body.size = (minSize + maxSize) / 2
+    body.targetScale = { x: 1, y: 1 };
+    body.size = (minSize + maxSize) / 2;
 
-    body.directionX = Math.cos(direction)
-    body.directionY = Math.sin(direction)
+    body.directionX = Math.cos(direction);
+    body.directionY = Math.sin(direction);
 
-    this.bodies.push(body)
+    this.bodies.push(body);
   }
 }
 
-module.exports = Stress
+module.exports = Stress;
 
 
 /***/ }),
diff --git a/dist/model.d.ts b/dist/model.d.ts
index cf914c3..15ff909 100644
--- a/dist/model.d.ts
+++ b/dist/model.d.ts
@@ -1,16 +1,12 @@
 import { BBox, default as RBush } from "rbush";
 import { Circle as SATCircle, Polygon as SATPolygon, Response, Vector as SATVector } from "sat";
-import { BaseSystem } from "./base-system";
+import { System } from "./system";
 import { Box } from "./bodies/box";
 import { Circle } from "./bodies/circle";
 import { Ellipse } from "./bodies/ellipse";
 import { Line } from "./bodies/line";
 import { Point } from "./bodies/point";
 import { Polygon } from "./bodies/polygon";
-/**
- * binary string to decimal number
- */
-export declare function bin2dec(binary: string): number;
 export { Polygon as DecompPolygon, Point as DecompPoint, isSimple } from "poly-decomp-es";
 export { RBush, BBox, Response, SATVector, SATPolygon, SATCircle };
 export type CollisionCallback = (response: Response) => boolean | void;
@@ -149,7 +145,7 @@ export interface BodyProps extends Required<BodyOptions> {
     /**
      * collisions system reference
      */
-    system?: BaseSystem;
+    system?: System;
     /**
      * was the body modified and needs update in the next checkCollision
      */
diff --git a/dist/model.js b/dist/model.js
index ae0a1f0..b3577b4 100644
--- a/dist/model.js
+++ b/dist/model.js
@@ -3,7 +3,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
     return (mod && mod.__esModule) ? mod : { "default": mod };
 };
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.BodyGroup = exports.getGroup = exports.BodyType = exports.SATCircle = exports.SATPolygon = exports.SATVector = exports.Response = exports.RBush = exports.isSimple = exports.bin2dec = void 0;
+exports.BodyGroup = exports.getGroup = exports.BodyType = exports.SATCircle = exports.SATPolygon = exports.SATVector = exports.Response = exports.RBush = exports.isSimple = void 0;
 const rbush_1 = __importDefault(require("rbush"));
 Object.defineProperty(exports, "RBush", { enumerable: true, get: function () { return rbush_1.default; } });
 const sat_1 = require("sat");
@@ -11,13 +11,6 @@ Object.defineProperty(exports, "SATCircle", { enumerable: true, get: function ()
 Object.defineProperty(exports, "SATPolygon", { enumerable: true, get: function () { return sat_1.Polygon; } });
 Object.defineProperty(exports, "Response", { enumerable: true, get: function () { return sat_1.Response; } });
 Object.defineProperty(exports, "SATVector", { enumerable: true, get: function () { return sat_1.Vector; } });
-/**
- * binary string to decimal number
- */
-function bin2dec(binary) {
-    return Number(`0b${binary}`.replace(/\s/g, ""));
-}
-exports.bin2dec = bin2dec;
 var poly_decomp_es_1 = require("poly-decomp-es");
 Object.defineProperty(exports, "isSimple", { enumerable: true, get: function () { return poly_decomp_es_1.isSimple; } });
 /**
diff --git a/dist/system.d.ts b/dist/system.d.ts
index a505686..ae8bb16 100644
--- a/dist/system.d.ts
+++ b/dist/system.d.ts
@@ -1,7 +1,7 @@
 /// <reference types="sat" />
 import { BaseSystem } from "./base-system";
 import { Line } from "./bodies/line";
-import { Body, CollisionCallback, RaycastHit, Response, Vector } from "./model";
+import { BBox, Body, CollisionCallback, RBush, RaycastHit, Response, Vector } from "./model";
 /**
  * collision system
  */
@@ -14,6 +14,11 @@ export declare class System<TBody extends Body = Body> extends BaseSystem<TBody>
      * for raycasting
      */
     protected ray: Line;
+    /**
+     * re-insert body into collision tree and update its bbox
+     * every body can be part of only one system
+     */
+    insert(body: TBody): RBush<TBody>;
     /**
      * separate (move away) bodies
      */
@@ -26,6 +31,10 @@ export declare class System<TBody extends Body = Body> extends BaseSystem<TBody>
      * check one body collisions with callback
      */
     checkOne(body: TBody, callback?: CollisionCallback, response?: Response): boolean;
+    /**
+     * callback all bodies in area
+     */
+    checkArea(area: BBox, callback?: CollisionCallback, response?: Response): boolean;
     /**
      * check all bodies collisions with callback
      */
diff --git a/dist/system.js b/dist/system.js
index 3d33d89..f79d42b 100644
--- a/dist/system.js
+++ b/dist/system.js
@@ -18,6 +18,16 @@ class System extends base_system_1.BaseSystem {
          */
         this.response = new model_1.Response();
     }
+    /**
+     * re-insert body into collision tree and update its bbox
+     * every body can be part of only one system
+     */
+    insert(body) {
+        const insertResult = super.insert(body);
+        // set system for later body.system.updateBody(body)
+        body.system = this;
+        return insertResult;
+    }
     /**
      * separate (move away) bodies
      */
@@ -60,6 +70,16 @@ class System extends base_system_1.BaseSystem {
         };
         return (0, optimized_1.some)(bodies, checkCollision);
     }
+    /**
+     * callback all bodies in area
+     */
+    checkArea(area, callback = utils_1.returnTrue, response = this.response) {
+        const bodies = this.search(area);
+        const checkOne = (body) => {
+            return this.checkOne(body, callback, response);
+        };
+        return (0, optimized_1.some)(bodies, checkOne);
+    }
     /**
      * check all bodies collisions with callback
      */
diff --git a/dist/utils.d.ts b/dist/utils.d.ts
index c2e3c32..da63702 100644
--- a/dist/utils.d.ts
+++ b/dist/utils.d.ts
@@ -103,3 +103,7 @@ export declare function cloneResponse(response: Response): Response;
  * dummy fn used as default, for optimization
  */
 export declare function returnTrue(): boolean;
+/**
+ * binary string to decimal number
+ */
+export declare function bin2dec(binary: string): number;
diff --git a/dist/utils.js b/dist/utils.js
index 337b3bf..6156e64 100644
--- a/dist/utils.js
+++ b/dist/utils.js
@@ -1,6 +1,6 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.returnTrue = exports.cloneResponse = exports.drawBVH = exports.drawPolygon = exports.dashLineTo = exports.getSATTest = exports.getBounceDirection = exports.mapArrayToVector = exports.mapVectorToArray = exports.clonePointsArray = exports.checkAInB = exports.areSameGroup = exports.intersectAABB = exports.notIntersectAABB = exports.bodyMoved = exports.extendBody = exports.clockwise = exports.distance = exports.ensurePolygonPoints = exports.ensureVectorPoint = exports.createBox = exports.createEllipse = exports.rad2deg = exports.deg2rad = exports.RAD2DEG = exports.DEG2RAD = void 0;
+exports.bin2dec = exports.returnTrue = exports.cloneResponse = exports.drawBVH = exports.drawPolygon = exports.dashLineTo = exports.getSATTest = exports.getBounceDirection = exports.mapArrayToVector = exports.mapVectorToArray = exports.clonePointsArray = exports.checkAInB = exports.areSameGroup = exports.intersectAABB = exports.notIntersectAABB = exports.bodyMoved = exports.extendBody = exports.clockwise = exports.distance = exports.ensurePolygonPoints = exports.ensureVectorPoint = exports.createBox = exports.createEllipse = exports.rad2deg = exports.deg2rad = exports.RAD2DEG = exports.DEG2RAD = void 0;
 const sat_1 = require("sat");
 const intersect_1 = require("./intersect");
 const model_1 = require("./model");
@@ -287,3 +287,10 @@ function returnTrue() {
     return true;
 }
 exports.returnTrue = returnTrue;
+/**
+ * binary string to decimal number
+ */
+function bin2dec(binary) {
+    return Number(`0b${binary}`.replace(/\s/g, ""));
+}
+exports.bin2dec = bin2dec;
diff --git a/docs/assets/search.js b/docs/assets/search.js
index e3c2bc6..c6c51b9 100644
--- a/docs/assets/search.js
+++ b/docs/assets/search.js
@@ -1,2 +1,2 @@
 window.searchData =
-  "data:application/octet-stream;base64,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";
+  "data:application/octet-stream;base64,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";
diff --git a/docs/classes/Circle.html b/docs/classes/Circle.html
index 093ada5..8a842ce 100644
--- a/docs/classes/Circle.html
+++ b/docs/classes/Circle.html
@@ -1103,7 +1103,8 @@ <h3 class="tsd-anchor-link">
             <div class="tsd-signature">
               <span class="tsd-kind-property">system</span
               ><span class="tsd-signature-symbol">?:</span>
-              <span class="tsd-signature-type">BaseSystem</span
+              <a href="System.html" class="tsd-signature-type tsd-kind-class"
+                >System</a
               ><span class="tsd-signature-symbol">&lt;</span
               ><a
                 href="../types/Body.html"
diff --git a/docs/classes/System.html b/docs/classes/System.html
index 05eb002..f4717d2 100644
--- a/docs/classes/System.html
+++ b/docs/classes/System.html
@@ -113,8 +113,8 @@ <h4>Hierarchy</h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L31"
-                >src/system.ts:31</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L33"
+                >src/system.ts:33</a
               >
             </li>
           </ul>
@@ -187,6 +187,11 @@ <h3 class="tsd-index-heading">Methods</h3>
                         <use href="../assets/icons.svg#icon-2048"></use></svg
                       ><span>check<wbr />All</span></a
                     >
+                    <a href="System.html#checkArea" class="tsd-index-link"
+                      ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
+                        <use href="../assets/icons.svg#icon-2048"></use></svg
+                      ><span>check<wbr />Area</span></a
+                    >
                     <a href="System.html#checkCollision" class="tsd-index-link"
                       ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                         <use href="../assets/icons.svg#icon-2048"></use></svg
@@ -295,9 +300,7 @@ <h3 class="tsd-index-heading">Methods</h3>
                         <use href="../assets/icons.svg#icon-2048"></use></svg
                       ><span>get<wbr />Potentials</span></a
                     >
-                    <a
-                      href="System.html#insert"
-                      class="tsd-index-link tsd-is-inherited"
+                    <a href="System.html#insert" class="tsd-index-link"
                       ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                         <use href="../assets/icons.svg#icon-2048"></use></svg
                       ><span>insert</span></a
@@ -570,8 +573,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L40"
-                    >src/system.ts:40</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L42"
+                    >src/system.ts:42</a
                   >
                 </li>
               </ul>
@@ -605,8 +608,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L35"
-                    >src/system.ts:35</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L37"
+                    >src/system.ts:37</a
                   >
                 </li>
               </ul>
@@ -740,8 +743,100 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L101"
-                        >src/system.ts:101</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L131"
+                        >src/system.ts:131</a
+                      >
+                    </li>
+                  </ul>
+                </aside>
+              </li>
+            </ul>
+          </section>
+          <section class="tsd-panel tsd-member">
+            <a id="checkArea" class="tsd-anchor"></a>
+            <h3 class="tsd-anchor-link">
+              <span>check<wbr />Area</span
+              ><a
+                href="#checkArea"
+                aria-label="Permalink"
+                class="tsd-anchor-icon"
+                ><svg viewBox="0 0 24 24">
+                  <use href="../assets/icons.svg#icon-anchor"></use></svg
+              ></a>
+            </h3>
+            <ul class="tsd-signatures">
+              <li class="tsd-signature tsd-anchor-link">
+                <a id="checkArea.checkArea-1" class="tsd-anchor"></a
+                ><span class="tsd-kind-call-signature">check<wbr />Area</span
+                ><span class="tsd-signature-symbol">(</span
+                ><span class="tsd-kind-parameter">area</span>,
+                <span class="tsd-kind-parameter">callback</span
+                ><span class="tsd-signature-symbol">?</span>,
+                <span class="tsd-kind-parameter">response</span
+                ><span class="tsd-signature-symbol">?</span
+                ><span class="tsd-signature-symbol">)</span
+                ><span class="tsd-signature-symbol">: </span
+                ><span class="tsd-signature-type">boolean</span
+                ><a
+                  href="#checkArea.checkArea-1"
+                  aria-label="Permalink"
+                  class="tsd-anchor-icon"
+                  ><svg viewBox="0 0 24 24">
+                    <use href="../assets/icons.svg#icon-anchor"></use></svg
+                ></a>
+              </li>
+              <li class="tsd-description">
+                <div class="tsd-comment tsd-typography">
+                  <p>callback all bodies in area</p>
+                </div>
+                <div class="tsd-parameters">
+                  <h4 class="tsd-parameters-title">Parameters</h4>
+                  <ul class="tsd-parameter-list">
+                    <li>
+                      <span
+                        ><span class="tsd-kind-parameter">area</span>:
+                        <a
+                          href="../interfaces/BBox.html"
+                          class="tsd-signature-type tsd-kind-interface"
+                          >BBox</a
+                        ></span
+                      >
+                    </li>
+                    <li>
+                      <span
+                        ><span class="tsd-kind-parameter">callback</span>:
+                        <a
+                          href="../types/CollisionCallback.html"
+                          class="tsd-signature-type tsd-kind-type-alias"
+                          >CollisionCallback</a
+                        ><span class="tsd-signature-symbol">
+                          = returnTrue</span
+                        ></span
+                      >
+                    </li>
+                    <li>
+                      <span
+                        ><span class="tsd-kind-parameter">response</span>:
+                        <a
+                          href="Response.html"
+                          class="tsd-signature-type tsd-kind-class"
+                          >Response</a
+                        ><span class="tsd-signature-symbol"> = ...</span></span
+                      >
+                    </li>
+                  </ul>
+                </div>
+                <h4 class="tsd-returns-title">
+                  Returns <span class="tsd-signature-type">boolean</span>
+                </h4>
+                <div class="tsd-comment tsd-typography"></div>
+                <aside class="tsd-sources">
+                  <ul>
+                    <li>
+                      Defined in
+                      <a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L115"
+                        >src/system.ts:115</a
                       >
                     </li>
                   </ul>
@@ -830,8 +925,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L115"
-                        >src/system.ts:115</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L145"
+                        >src/system.ts:145</a
                       >
                     </li>
                   </ul>
@@ -922,8 +1017,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L75"
-                        >src/system.ts:75</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L89"
+                        >src/system.ts:89</a
                       >
                     </li>
                   </ul>
@@ -1904,8 +1999,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L164"
-                        >src/base-system.ts:164</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L161"
+                        >src/base-system.ts:161</a
                       >
                     </li>
                   </ul>
@@ -1966,8 +2061,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L173"
-                        >src/base-system.ts:173</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L170"
+                        >src/base-system.ts:170</a
                       >
                     </li>
                   </ul>
@@ -2141,8 +2236,8 @@ <h4>Deprecated</h4>
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L198"
-                        >src/base-system.ts:198</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L195"
+                        >src/base-system.ts:195</a
                       >
                     </li>
                   </ul>
@@ -2150,7 +2245,7 @@ <h4>Deprecated</h4>
               </li>
             </ul>
           </section>
-          <section class="tsd-panel tsd-member tsd-is-inherited">
+          <section class="tsd-panel tsd-member">
             <a id="insert" class="tsd-anchor"></a>
             <h3 class="tsd-anchor-link">
               <span>insert</span
@@ -2159,7 +2254,7 @@ <h3 class="tsd-anchor-link">
                   <use href="../assets/icons.svg#icon-anchor"></use></svg
               ></a>
             </h3>
-            <ul class="tsd-signatures tsd-is-inherited">
+            <ul class="tsd-signatures">
               <li class="tsd-signature tsd-anchor-link">
                 <a id="insert.insert-1" class="tsd-anchor"></a
                 ><span class="tsd-kind-call-signature">insert</span
@@ -2186,7 +2281,7 @@ <h3 class="tsd-anchor-link">
               <li class="tsd-description">
                 <div class="tsd-comment tsd-typography">
                   <p>
-                    re-insert body into collision tree and update its aabb every
+                    re-insert body into collision tree and update its bbox every
                     body can be part of only one system
                   </p>
                 </div>
@@ -2218,13 +2313,13 @@ <h4 class="tsd-returns-title">
                 </h4>
                 <div class="tsd-comment tsd-typography"></div>
                 <aside class="tsd-sources">
-                  <p>Inherited from BaseSystem.insert</p>
+                  <p>Overrides BaseSystem.insert</p>
                   <ul>
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L119"
-                        >src/base-system.ts:119</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L48"
+                        >src/system.ts:48</a
                       >
                     </li>
                   </ul>
@@ -2480,8 +2575,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L182"
-                        >src/system.ts:182</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L212"
+                        >src/system.ts:212</a
                       >
                     </li>
                   </ul>
@@ -2577,8 +2672,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L188"
-                        >src/base-system.ts:188</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L185"
+                        >src/base-system.ts:185</a
                       >
                     </li>
                   </ul>
@@ -2708,8 +2803,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L45"
-                        >src/system.ts:45</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L59"
+                        >src/system.ts:59</a
                       >
                     </li>
                   </ul>
@@ -2774,8 +2869,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L54"
-                        >src/system.ts:54</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/system.ts#L68"
+                        >src/system.ts:68</a
                       >
                     </li>
                   </ul>
@@ -3050,8 +3145,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L206"
-                        >src/base-system.ts:206</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L203"
+                        >src/base-system.ts:203</a
                       >
                     </li>
                   </ul>
@@ -3098,8 +3193,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L155"
-                        >src/base-system.ts:155</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L152"
+                        >src/base-system.ts:152</a
                       >
                     </li>
                   </ul>
@@ -3165,8 +3260,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L148"
-                        >src/base-system.ts:148</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/base-system.ts#L145"
+                        >src/base-system.ts:145</a
                       >
                     </li>
                   </ul>
@@ -3368,6 +3463,10 @@ <h3>
                 ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                   <use href="../assets/icons.svg#icon-2048"></use></svg
                 ><span>check<wbr />All</span></a
+              ><a href="#checkArea" class=""
+                ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
+                  <use href="../assets/icons.svg#icon-2048"></use></svg
+                ><span>check<wbr />Area</span></a
               ><a href="#checkCollision" class=""
                 ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                   <use href="../assets/icons.svg#icon-2048"></use></svg
@@ -3432,7 +3531,7 @@ <h3>
                 ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                   <use href="../assets/icons.svg#icon-2048"></use></svg
                 ><span>get<wbr />Potentials</span></a
-              ><a href="#insert" class="tsd-is-inherited"
+              ><a href="#insert" class=""
                 ><svg class="tsd-kind-icon" viewBox="0 0 24 24">
                   <use href="../assets/icons.svg#icon-2048"></use></svg
                 ><span>insert</span></a
diff --git a/docs/demo/demo.js b/docs/demo/demo.js
index 0297015..39aae5e 100644
--- a/docs/demo/demo.js
+++ b/docs/demo/demo.js
@@ -2813,7 +2813,7 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
             return polygon;
           }
           /**
-           * re-insert body into collision tree and update its aabb
+           * re-insert body into collision tree and update its bbox
            * every body can be part of only one system
            */
           insert(body) {
@@ -2831,8 +2831,6 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
             body.minY = body.bbox.minY - body.padding;
             body.maxX = body.bbox.maxX + body.padding;
             body.maxY = body.bbox.maxY + body.padding;
-            // set system for later body.system.updateBody(body)
-            body.system = this;
             // reinsert bounding box to collision tree
             return super.insert(body);
           }
@@ -4171,7 +4169,6 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
           exports.Response =
           exports.RBush =
           exports.isSimple =
-          exports.bin2dec =
             void 0;
         const rbush_1 = __importDefault(
           __webpack_require__(/*! rbush */ "./node_modules/rbush/rbush.min.js"),
@@ -4209,13 +4206,6 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
             return sat_1.Vector;
           },
         });
-        /**
-         * binary string to decimal number
-         */
-        function bin2dec(binary) {
-          return Number(`0b${binary}`.replace(/\s/g, ""));
-        }
-        exports.bin2dec = bin2dec;
         var poly_decomp_es_1 = __webpack_require__(
           /*! poly-decomp-es */ "./node_modules/poly-decomp-es/dist/poly-decomp-es.js",
         );
@@ -4382,6 +4372,16 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
              */
             this.response = new model_1.Response();
           }
+          /**
+           * re-insert body into collision tree and update its bbox
+           * every body can be part of only one system
+           */
+          insert(body) {
+            const insertResult = super.insert(body);
+            // set system for later body.system.updateBody(body)
+            body.system = this;
+            return insertResult;
+          }
           /**
            * separate (move away) bodies
            */
@@ -4430,6 +4430,20 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
             };
             return (0, optimized_1.some)(bodies, checkCollision);
           }
+          /**
+           * callback all bodies in area
+           */
+          checkArea(
+            area,
+            callback = utils_1.returnTrue,
+            response = this.response,
+          ) {
+            const bodies = this.search(area);
+            const checkOne = (body) => {
+              return this.checkOne(body, callback, response);
+            };
+            return (0, optimized_1.some)(bodies, checkOne);
+          }
           /**
            * check all bodies collisions with callback
            */
@@ -4537,7 +4551,8 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
         "use strict";
 
         Object.defineProperty(exports, "__esModule", { value: true });
-        exports.returnTrue =
+        exports.bin2dec =
+          exports.returnTrue =
           exports.cloneResponse =
           exports.drawBVH =
           exports.drawPolygon =
@@ -4886,6 +4901,13 @@ which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
           return true;
         }
         exports.returnTrue = returnTrue;
+        /**
+         * binary string to decimal number
+         */
+        function bin2dec(binary) {
+          return Number(`0b${binary}`.replace(/\s/g, ""));
+        }
+        exports.bin2dec = bin2dec;
 
         /***/
       },
diff --git a/docs/enums/BodyGroup.html b/docs/enums/BodyGroup.html
index d6ec083..0d425f1 100644
--- a/docs/enums/BodyGroup.html
+++ b/docs/enums/BodyGroup.html
@@ -73,8 +73,8 @@ <h1>Enumeration BodyGroup</h1>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L58"
-                >src/model.ts:58</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L51"
+                >src/model.ts:51</a
               >
             </li>
           </ul>
@@ -156,8 +156,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L62"
-                    >src/model.ts:62</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L55"
+                    >src/model.ts:55</a
                   >
                 </li>
               </ul>
@@ -182,8 +182,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L60"
-                    >src/model.ts:60</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L53"
+                    >src/model.ts:53</a
                   >
                 </li>
               </ul>
@@ -208,8 +208,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L59"
-                    >src/model.ts:59</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L52"
+                    >src/model.ts:52</a
                   >
                 </li>
               </ul>
@@ -234,8 +234,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L63"
-                    >src/model.ts:63</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L56"
+                    >src/model.ts:56</a
                   >
                 </li>
               </ul>
@@ -260,8 +260,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L64"
-                    >src/model.ts:64</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L57"
+                    >src/model.ts:57</a
                   >
                 </li>
               </ul>
@@ -286,8 +286,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L61"
-                    >src/model.ts:61</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L54"
+                    >src/model.ts:54</a
                   >
                 </li>
               </ul>
diff --git a/docs/enums/BodyType.html b/docs/enums/BodyType.html
index 75d75f1..873bbc6 100644
--- a/docs/enums/BodyType.html
+++ b/docs/enums/BodyType.html
@@ -73,8 +73,8 @@ <h1>Enumeration BodyType</h1>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L37"
-                >src/model.ts:37</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L30"
+                >src/model.ts:30</a
               >
             </li>
           </ul>
@@ -156,8 +156,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L41"
-                    >src/model.ts:41</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L34"
+                    >src/model.ts:34</a
                   >
                 </li>
               </ul>
@@ -182,8 +182,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L39"
-                    >src/model.ts:39</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L32"
+                    >src/model.ts:32</a
                   >
                 </li>
               </ul>
@@ -208,8 +208,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L38"
-                    >src/model.ts:38</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L31"
+                    >src/model.ts:31</a
                   >
                 </li>
               </ul>
@@ -234,8 +234,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L42"
-                    >src/model.ts:42</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L35"
+                    >src/model.ts:35</a
                   >
                 </li>
               </ul>
@@ -260,8 +260,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L43"
-                    >src/model.ts:43</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L36"
+                    >src/model.ts:36</a
                   >
                 </li>
               </ul>
@@ -286,8 +286,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L40"
-                    >src/model.ts:40</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L33"
+                    >src/model.ts:33</a
                   >
                 </li>
               </ul>
diff --git a/docs/functions/bin2dec.html b/docs/functions/bin2dec.html
index 2342ddd..4b4f719 100644
--- a/docs/functions/bin2dec.html
+++ b/docs/functions/bin2dec.html
@@ -103,8 +103,8 @@ <h4 class="tsd-returns-title">
                   <li>
                     Defined in
                     <a
-                      href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L20"
-                      >src/model.ts:20</a
+                      href="https://github.com/Prozi/detect-collisions/blob/master/src/utils.ts#L382"
+                      >src/utils.ts:382</a
                     >
                   </li>
                 </ul>
diff --git a/docs/functions/ensureConvex.html b/docs/functions/ensureConvex.html
index f43015a..6a5554f 100644
--- a/docs/functions/ensureConvex.html
+++ b/docs/functions/ensureConvex.html
@@ -123,14 +123,14 @@ <h4>Type Parameters</h4>
                         >Polygon</a
                       ><span class="tsd-signature-symbol"> | </span
                       ><a
-                        href="../classes/Circle.html"
+                        href="../classes/Point.html"
                         class="tsd-signature-type tsd-kind-class"
-                        >Circle</a
+                        >Point</a
                       ><span class="tsd-signature-symbol"> | </span
                       ><a
-                        href="../classes/Point.html"
+                        href="../classes/Circle.html"
                         class="tsd-signature-type tsd-kind-class"
-                        >Point</a
+                        >Circle</a
                       ></span
                     >
                   </li>
diff --git a/docs/functions/getGroup.html b/docs/functions/getGroup.html
index 2142785..b590321 100644
--- a/docs/functions/getGroup.html
+++ b/docs/functions/getGroup.html
@@ -104,8 +104,8 @@ <h4 class="tsd-returns-title">
                   <li>
                     Defined in
                     <a
-                      href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L49"
-                      >src/model.ts:49</a
+                      href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L42"
+                      >src/model.ts:42</a
                     >
                   </li>
                 </ul>
diff --git a/docs/interfaces/BodyOptions.html b/docs/interfaces/BodyOptions.html
index 20573a1..50b1e30 100644
--- a/docs/interfaces/BodyOptions.html
+++ b/docs/interfaces/BodyOptions.html
@@ -111,8 +111,8 @@ <h1>Interface BodyOptions</h1>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L91"
-                >src/model.ts:91</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L84"
+                >src/model.ts:84</a
               >
             </li>
           </ul>
@@ -199,8 +199,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L110"
-                    >src/model.ts:110</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L103"
+                    >src/model.ts:103</a
                   >
                 </li>
               </ul>
@@ -230,8 +230,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L120"
-                    >src/model.ts:120</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L113"
+                    >src/model.ts:113</a
                   >
                 </li>
               </ul>
@@ -264,8 +264,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L105"
-                    >src/model.ts:105</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L98"
+                    >src/model.ts:98</a
                   >
                 </li>
               </ul>
@@ -298,8 +298,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L95"
-                    >src/model.ts:95</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L88"
+                    >src/model.ts:88</a
                   >
                 </li>
               </ul>
@@ -334,8 +334,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L100"
-                    >src/model.ts:100</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L93"
+                    >src/model.ts:93</a
                   >
                 </li>
               </ul>
@@ -365,8 +365,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L115"
-                    >src/model.ts:115</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L108"
+                    >src/model.ts:108</a
                   >
                 </li>
               </ul>
diff --git a/docs/interfaces/BodyProps.html b/docs/interfaces/BodyProps.html
index 49aa814..2d2cc68 100644
--- a/docs/interfaces/BodyProps.html
+++ b/docs/interfaces/BodyProps.html
@@ -124,7 +124,10 @@ <h1>Interface BodyProps</h1>
           ><span class="tsd-signature-symbol">; </span><br /><span>    </span
           ><a class="tsd-kind-property" href="BodyProps.html#system">system</a
           ><span class="tsd-signature-symbol">?: </span
-          ><span class="tsd-signature-type">BaseSystem</span
+          ><a
+            href="../classes/System.html"
+            class="tsd-signature-type tsd-kind-class"
+            >System</a
           ><span class="tsd-signature-symbol">&lt;</span
           ><a
             href="../types/Body.html"
@@ -318,8 +321,8 @@ <h4>Implemented by</h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L162"
-                >src/model.ts:162</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L155"
+                >src/model.ts:155</a
               >
             </li>
           </ul>
@@ -510,8 +513,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L110"
-                    >src/model.ts:110</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L103"
+                    >src/model.ts:103</a
                   >
                 </li>
               </ul>
@@ -542,8 +545,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L181"
-                    >src/model.ts:181</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L174"
+                    >src/model.ts:174</a
                   >
                 </li>
               </ul>
@@ -575,8 +578,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L196"
-                    >src/model.ts:196</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L189"
+                    >src/model.ts:189</a
                   >
                 </li>
               </ul>
@@ -606,8 +609,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L120"
-                    >src/model.ts:120</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L113"
+                    >src/model.ts:113</a
                   >
                 </li>
               </ul>
@@ -640,8 +643,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L105"
-                    >src/model.ts:105</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L98"
+                    >src/model.ts:98</a
                   >
                 </li>
               </ul>
@@ -673,8 +676,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L176"
-                    >src/model.ts:176</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L169"
+                    >src/model.ts:169</a
                   >
                 </li>
               </ul>
@@ -707,8 +710,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L95"
-                    >src/model.ts:95</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L88"
+                    >src/model.ts:88</a
                   >
                 </li>
               </ul>
@@ -743,8 +746,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L100"
-                    >src/model.ts:100</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L93"
+                    >src/model.ts:93</a
                   >
                 </li>
               </ul>
@@ -777,8 +780,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L186"
-                    >src/model.ts:186</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L179"
+                    >src/model.ts:179</a
                   >
                 </li>
               </ul>
@@ -808,8 +811,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L115"
-                    >src/model.ts:115</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L108"
+                    >src/model.ts:108</a
                   >
                 </li>
               </ul>
@@ -828,7 +831,10 @@ <h3 class="tsd-anchor-link">
             <div class="tsd-signature">
               <span class="tsd-kind-property">system</span
               ><span class="tsd-signature-symbol">?:</span>
-              <span class="tsd-signature-type">BaseSystem</span
+              <a
+                href="../classes/System.html"
+                class="tsd-signature-type tsd-kind-class"
+                >System</a
               ><span class="tsd-signature-symbol">&lt;</span
               ><a
                 href="../types/Body.html"
@@ -845,8 +851,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L191"
-                    >src/model.ts:191</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L184"
+                    >src/model.ts:184</a
                   >
                 </li>
               </ul>
@@ -878,8 +884,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L166"
-                    >src/model.ts:166</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L159"
+                    >src/model.ts:159</a
                   >
                 </li>
               </ul>
@@ -916,8 +922,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L171"
-                    >src/model.ts:171</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L164"
+                    >src/model.ts:164</a
                   >
                 </li>
               </ul>
@@ -957,8 +963,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L201"
-                        >src/model.ts:201</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L194"
+                        >src/model.ts:194</a
                       >
                     </li>
                   </ul>
@@ -997,8 +1003,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L206"
-                        >src/model.ts:206</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L199"
+                        >src/model.ts:199</a
                       >
                     </li>
                   </ul>
@@ -1061,8 +1067,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L236"
-                        >src/model.ts:236</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L229"
+                        >src/model.ts:229</a
                       >
                     </li>
                   </ul>
@@ -1122,8 +1128,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L231"
-                        >src/model.ts:231</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L224"
+                        >src/model.ts:224</a
                       >
                     </li>
                   </ul>
@@ -1180,8 +1186,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L241"
-                        >src/model.ts:241</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L234"
+                        >src/model.ts:234</a
                       >
                     </li>
                   </ul>
@@ -1269,8 +1275,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L221"
-                        >src/model.ts:221</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L214"
+                        >src/model.ts:214</a
                       >
                     </li>
                   </ul>
@@ -1362,8 +1368,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L226"
-                        >src/model.ts:226</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L219"
+                        >src/model.ts:219</a
                       >
                     </li>
                   </ul>
@@ -1458,8 +1464,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L211"
-                        >src/model.ts:211</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L204"
+                        >src/model.ts:204</a
                       >
                     </li>
                   </ul>
@@ -1554,8 +1560,8 @@ <h4 class="tsd-returns-title">
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L216"
-                        >src/model.ts:216</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L209"
+                        >src/model.ts:209</a
                       >
                     </li>
                   </ul>
diff --git a/docs/interfaces/ChildrenData.html b/docs/interfaces/ChildrenData.html
index 28f05ff..3c1a169 100644
--- a/docs/interfaces/ChildrenData.html
+++ b/docs/interfaces/ChildrenData.html
@@ -119,8 +119,8 @@ <h4>Type Parameters</h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L77"
-                >src/model.ts:77</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L70"
+                >src/model.ts:70</a
               >
             </li>
           </ul>
@@ -190,8 +190,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L78"
-                    >src/model.ts:78</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L71"
+                    >src/model.ts:71</a
                   >
                 </li>
               </ul>
diff --git a/docs/interfaces/Data.html b/docs/interfaces/Data.html
index 597a0b8..5b33087 100644
--- a/docs/interfaces/Data.html
+++ b/docs/interfaces/Data.html
@@ -119,8 +119,8 @@ <h4>Type Parameters</h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L84"
-                >src/model.ts:84</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L77"
+                >src/model.ts:77</a
               >
             </li>
           </ul>
@@ -186,8 +186,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L85"
-                    >src/model.ts:85</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L78"
+                    >src/model.ts:78</a
                   >
                 </li>
               </ul>
diff --git a/docs/interfaces/GetAABBAsBox.html b/docs/interfaces/GetAABBAsBox.html
index b7dbb90..7936020 100644
--- a/docs/interfaces/GetAABBAsBox.html
+++ b/docs/interfaces/GetAABBAsBox.html
@@ -109,8 +109,8 @@ <h1>Interface GetAABBAsBox</h1>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L150"
-                >src/model.ts:150</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L143"
+                >src/model.ts:143</a
               >
             </li>
           </ul>
@@ -255,8 +255,8 @@ <h5>
                     <li>
                       Defined in
                       <a
-                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L151"
-                        >src/model.ts:151</a
+                        href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L144"
+                        >src/model.ts:144</a
                       >
                     </li>
                   </ul>
diff --git a/docs/interfaces/PotentialVector.html b/docs/interfaces/PotentialVector.html
index ab2dcd7..367514c 100644
--- a/docs/interfaces/PotentialVector.html
+++ b/docs/interfaces/PotentialVector.html
@@ -110,8 +110,8 @@ <h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L134"
-                >src/model.ts:134</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L127"
+                >src/model.ts:127</a
               >
             </li>
           </ul>
@@ -174,8 +174,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L135"
-                    >src/model.ts:135</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L128"
+                    >src/model.ts:128</a
                   >
                 </li>
               </ul>
@@ -201,8 +201,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L136"
-                    >src/model.ts:136</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L129"
+                    >src/model.ts:129</a
                   >
                 </li>
               </ul>
diff --git a/docs/interfaces/RaycastHit.html b/docs/interfaces/RaycastHit.html
index 1292b2c..5a12b7a 100644
--- a/docs/interfaces/RaycastHit.html
+++ b/docs/interfaces/RaycastHit.html
@@ -112,8 +112,8 @@ <h4>Type Parameters</h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L126"
-                >src/model.ts:126</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L119"
+                >src/model.ts:119</a
               >
             </li>
           </ul>
@@ -179,8 +179,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L128"
-                    >src/model.ts:128</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L121"
+                    >src/model.ts:121</a
                   >
                 </li>
               </ul>
@@ -209,8 +209,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L127"
-                    >src/model.ts:127</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L120"
+                    >src/model.ts:120</a
                   >
                 </li>
               </ul>
diff --git a/docs/interfaces/Vector.html b/docs/interfaces/Vector.html
index 8358f8b..4cf6d88 100644
--- a/docs/interfaces/Vector.html
+++ b/docs/interfaces/Vector.html
@@ -108,8 +108,8 @@ <h4>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L142"
-                >src/model.ts:142</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L135"
+                >src/model.ts:135</a
               >
             </li>
           </ul>
@@ -177,8 +177,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L143"
-                    >src/model.ts:143</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L136"
+                    >src/model.ts:136</a
                   >
                 </li>
               </ul>
@@ -209,8 +209,8 @@ <h3 class="tsd-anchor-link">
                 <li>
                   Defined in
                   <a
-                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L144"
-                    >src/model.ts:144</a
+                    href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L137"
+                    >src/model.ts:137</a
                   >
                 </li>
               </ul>
diff --git a/docs/types/Body.html b/docs/types/Body.html
index 561fea1..c89c805 100644
--- a/docs/types/Body.html
+++ b/docs/types/Body.html
@@ -107,8 +107,8 @@ <h1>Type alias Body</h1>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L157"
-                >src/model.ts:157</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L150"
+                >src/model.ts:150</a
               >
             </li>
           </ul>
diff --git a/docs/types/CollisionCallback.html b/docs/types/CollisionCallback.html
index 7edaef8..4b6d93a 100644
--- a/docs/types/CollisionCallback.html
+++ b/docs/types/CollisionCallback.html
@@ -122,8 +122,8 @@ <h4 class="tsd-returns-title">
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L32"
-                >src/model.ts:32</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L25"
+                >src/model.ts:25</a
               >
             </li>
           </ul>
diff --git a/docs/types/InTest.html b/docs/types/InTest.html
index 6abd6fd..55a6fe5 100644
--- a/docs/types/InTest.html
+++ b/docs/types/InTest.html
@@ -157,8 +157,8 @@ <h4 class="tsd-returns-title">
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L249"
-                >src/model.ts:249</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L242"
+                >src/model.ts:242</a
               >
             </li>
           </ul>
diff --git a/docs/types/Leaf.html b/docs/types/Leaf.html
index e6a836b..a1f50c9 100644
--- a/docs/types/Leaf.html
+++ b/docs/types/Leaf.html
@@ -144,8 +144,8 @@ <h5>
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L70"
-                >src/model.ts:70</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L63"
+                >src/model.ts:63</a
               >
             </li>
           </ul>
diff --git a/docs/types/SATTest.html b/docs/types/SATTest.html
index 9d885d1..ddbc798 100644
--- a/docs/types/SATTest.html
+++ b/docs/types/SATTest.html
@@ -202,8 +202,8 @@ <h4 class="tsd-returns-title">
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L244"
-                >src/model.ts:244</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L237"
+                >src/model.ts:237</a
               >
             </li>
           </ul>
diff --git a/docs/types/TraverseFunction.html b/docs/types/TraverseFunction.html
index 0a355cb..cea7a51 100644
--- a/docs/types/TraverseFunction.html
+++ b/docs/types/TraverseFunction.html
@@ -182,8 +182,8 @@ <h4 class="tsd-returns-title">
             <li>
               Defined in
               <a
-                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L254"
-                >src/model.ts:254</a
+                href="https://github.com/Prozi/detect-collisions/blob/master/src/model.ts#L247"
+                >src/model.ts:247</a
               >
             </li>
           </ul>
diff --git a/package.json b/package.json
index efedc45..73d2600 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "detect-collisions",
-  "version": "9.6.0",
-  "description": "detecting collisions between bodies: Points, Lines, Boxes, Polygons (Concave too), Ellipses and Circles. Also RayCasting. All bodies can have offset, rotation, scale, bounding box padding, can be static (non moving) or be trigger bodies (non colliding).",
+  "version": "9.7.0",
+  "description": "detecting collisions between bodies: Points, Lines, Boxes, Polygons, Ellipses, Circles. RayCasting. Bodies have offset, rotation, scale, bbox padding, be static (non moving), be trigger bodies (non colliding).",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "scripts": {
diff --git a/src/base-system.ts b/src/base-system.ts
index d91c4e1..4b3dbbc 100644
--- a/src/base-system.ts
+++ b/src/base-system.ts
@@ -114,7 +114,7 @@ export class BaseSystem<TBody extends Body = Body>
   }
 
   /**
-   * re-insert body into collision tree and update its aabb
+   * re-insert body into collision tree and update its bbox
    * every body can be part of only one system
    */
   insert(body: TBody): RBush<TBody> {
@@ -136,9 +136,6 @@ export class BaseSystem<TBody extends Body = Body>
     body.maxX = body.bbox.maxX + body.padding;
     body.maxY = body.bbox.maxY + body.padding;
 
-    // set system for later body.system.updateBody(body)
-    body.system = this;
-
     // reinsert bounding box to collision tree
     return super.insert(body);
   }
diff --git a/src/bodies/circle.ts b/src/bodies/circle.ts
index 88aafa7..46e5838 100644
--- a/src/bodies/circle.ts
+++ b/src/bodies/circle.ts
@@ -1,7 +1,7 @@
 import { BBox } from "rbush";
 import { Circle as SATCircle } from "sat";
 
-import { BaseSystem } from "../base-system";
+import { System } from "../system";
 import {
   BodyGroup,
   BodyOptions,
@@ -76,7 +76,7 @@ export class Circle extends SATCircle implements BBox, BodyProps {
   /**
    * reference to collision system
    */
-  system?: BaseSystem;
+  system?: System;
 
   /**
    * was the polygon modified and needs update in the next checkCollision
diff --git a/src/model.ts b/src/model.ts
index 7cfc28b..f571f88 100644
--- a/src/model.ts
+++ b/src/model.ts
@@ -6,7 +6,7 @@ import {
   Vector as SATVector,
 } from "sat";
 
-import { BaseSystem } from "./base-system";
+import { System } from "./system";
 import { Box } from "./bodies/box";
 import { Circle } from "./bodies/circle";
 import { Ellipse } from "./bodies/ellipse";
@@ -14,13 +14,6 @@ import { Line } from "./bodies/line";
 import { Point } from "./bodies/point";
 import { Polygon } from "./bodies/polygon";
 
-/**
- * binary string to decimal number
- */
-export function bin2dec(binary: string): number {
-  return Number(`0b${binary}`.replace(/\s/g, ""));
-}
-
 export {
   Polygon as DecompPolygon,
   Point as DecompPoint,
@@ -188,7 +181,7 @@ export interface BodyProps extends Required<BodyOptions> {
   /**
    * collisions system reference
    */
-  system?: BaseSystem;
+  system?: System;
 
   /**
    * was the body modified and needs update in the next checkCollision
diff --git a/src/system.ts b/src/system.ts
index a8d787f..3251197 100644
--- a/src/system.ts
+++ b/src/system.ts
@@ -11,6 +11,7 @@ import {
   BodyGroup,
   BodyType,
   CollisionCallback,
+  RBush,
   RaycastHit,
   Response,
   SATVector,
@@ -40,6 +41,18 @@ export class System<TBody extends Body = Body> extends BaseSystem<TBody> {
    */
   protected ray!: Line;
 
+  /**
+   * re-insert body into collision tree and update its bbox
+   * every body can be part of only one system
+   */
+  insert(body: TBody): RBush<TBody> {
+    const insertResult = super.insert(body);
+    // set system for later body.system.updateBody(body)
+    body.system = this;
+
+    return insertResult;
+  }
+
   /**
    * separate (move away) bodies
    */
@@ -97,7 +110,7 @@ export class System<TBody extends Body = Body> extends BaseSystem<TBody> {
   }
 
   /**
-   * check all bodies in area collisions with callback
+   * callback all bodies in area
    */
   checkArea(
     area: BBox,
diff --git a/src/utils.ts b/src/utils.ts
index 243e997..c1f86ed 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -375,3 +375,10 @@ export function cloneResponse(response: Response) {
 export function returnTrue() {
   return true;
 }
+
+/**
+ * binary string to decimal number
+ */
+export function bin2dec(binary: string): number {
+  return Number(`0b${binary}`.replace(/\s/g, ""));
+}