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+# react-babylonjs
+
+> _'react-babylonjs'_ integrates the Babylon.js real time 3D engine with React
+
+`react-babylonjs` lets you build your scene and components using a familiar declarative syntax with the benefits of reusable components and hooks. The Babylon.js API is mostly covered declaratively thanks to code generation and even custom props allow you to declaratively add shadows, physics, 3D models, attach 2D/3D UI to meshes, etc.
+
+Fully supports hooks. Full support for TypeScript with auto-completion on elements and compile time checks. Context API and hooks provide easy access to Scene/Engine/Canvas.
+
+[![NPM version](http://img.shields.io/npm/v/react-babylonjs.svg?style=flat-square)](https://www.npmjs.com/package/react-babylonjs)
+[![NPM downloads](http://img.shields.io/npm/dm/react-babylonjs.svg?style=flat-square)](https://www.npmjs.com/package/react-babylonjs)
+
+## How to Install
+
+```sh
+$ npm i react-babylonjs @babylonjs/core @babylonjs/gui
+```
+
+OR
+
+```sh
+$ yarn add react-babylonjs @babylonjs/core @babylonjs/gui
+```
+
+_No third party dependencies outside of React + babylon.js_
+If you are upgrading from 2.x please follow the breaking changes guide:
+
+> [3.0 breaking changes](docs/breaking-changes-2.x-to-3.0.md)
+
+## Models
+
+If you are using 3D models ensure you have added the `@babylonjs/loaders` NPM. It is not a direct dependency, but registers loaders as plugins via imports with side effects:
+
+- Register **all** model types `import @babylonjs/loaders;`
+- OBJ `import '@babylonjs/loaders/OBJ';`
+- glTF `import '@babylonjs/loaders/glTF';`
+
+_(more instructions on model loading in ES6 [here](https://doc.babylonjs.com/divingDeeper/developWithBjs/treeShaking#loaders) )_
+
+# Usage Styles
+
+`react-babylonjs` tries to remain unopinionated about how you integrate BabylonJS with React. This module provides a 100% declarative option and/or you can customise by adding code. There are lots of escape hatches where you can switch to imperative coding and direct access to objects.
+
+## Connecting the pieces
+
+If you are new to React or babylon.js (or both) there is some learning ahead. The babylon.js documentation site is really useful for understanding the basics of lighting, cameras, etc. This project aims to make easy to integrate those into React using JSX.
+
+Here we re-use a `SpinningBox` component that can be clicked or hovered. These reusable components can be used to compose a declarative scene. We are using hooks for the clicking, hovering and spinning.
+
+![Connecting the pieces](https://raw.githubusercontent.com/brianzinn/react-babylonjs/master/docs/images/react-babylonjs-boxes.gif)
+
+```jsx
+import React, { useRef, useState } from "react";
+import {
+  Engine,
+  Scene,
+  useBeforeRender,
+  useClick,
+  useHover,
+} from "react-babylonjs";
+import { Vector3, Color3 } from "@babylonjs/core";
+
+const DefaultScale = new Vector3(1, 1, 1);
+const BiggerScale = new Vector3(1.25, 1.25, 1.25);
+
+const SpinningBox = (props) => {
+  // access Babylon scene objects with same React hook as regular DOM elements
+  const boxRef = useRef(null);
+
+  const [clicked, setClicked] = useState(false);
+  useClick(() => setClicked((clicked) => !clicked), boxRef);
+
+  const [hovered, setHovered] = useState(false);
+  useHover(
+    () => setHovered(true),
+    () => setHovered(false),
+    boxRef
+  );
+
+  // This will rotate the box on every Babylon frame.
+  const rpm = 5;
+  useBeforeRender((scene) => {
+    if (boxRef.current) {
+      // Delta time smoothes the animation.
+      var deltaTimeInMillis = scene.getEngine().getDeltaTime();
+      boxRef.current.rotation.y +=
+        (rpm / 60) * Math.PI * 2 * (deltaTimeInMillis / 1000);
+    }
+  });
+
+  return (
+    <box
+      name={props.name}
+      ref={boxRef}
+      size={2}
+      position={props.position}
+      scaling={clicked ? BiggerScale : DefaultScale}
+    >
+      <standardMaterial
+        name={`${props.name}-mat`}
+        diffuseColor={hovered ? props.hoveredColor : props.color}
+        specularColor={Color3.Black()}
+      />
+    </box>
+  );
+};
+
+export const SceneWithSpinningBoxes = () => (
+  <div>
+    <Engine antialias adaptToDeviceRatio canvasId="babylonJS">
+      <Scene>
+        <arcRotateCamera
+          name="camera1"
+          target={Vector3.Zero()}
+          alpha={Math.PI / 2}
+          beta={Math.PI / 4}
+          radius={8}
+        />
+        <hemisphericLight
+          name="light1"
+          intensity={0.7}
+          direction={Vector3.Up()}
+        />
+        <SpinningBox
+          name="left"
+          position={new Vector3(-2, 0, 0)}
+          color={Color3.FromHexString("#EEB5EB")}
+          hoveredColor={Color3.FromHexString("#C26DBC")}
+        />
+        <SpinningBox
+          name="right"
+          position={new Vector3(2, 0, 0)}
+          color={Color3.FromHexString("#C8F4F9")}
+          hoveredColor={Color3.FromHexString("#3CACAE")}
+        />
+      </Scene>
+    </Engine>
+  </div>
+);
+```
+
+[code sandbox for above](https://codesandbox.io/s/epic-darwin-tohk0)
+
+## Hooks, Shadows and Physics (and optionally TypeScript, too)
+
+You can declaratively use many features together - here only the button click handler actually has any code - and we have declarative Physics, GUI, Lighting and Shadows. demo: [Bouncy demo](https://brianzinn.github.io/react-babylonjs/?path=/story/physics--bouncy-playground-story)
+
+```jsx
+import React, { useRef } from 'react';
+// full code at https://github.com/brianzinn/create-react-app-typescript-babylonjs
+
+const App: React.FC = () => {
+  let sphereRef = useRef<Nullable<Mesh>>();
+
+  const onButtonClicked = () => {
+    if (sphereRef.current) {
+      sphereRef.current.physicsImpostor!.applyImpulse(
+        Vector3.Up().scale(10),
+        sphereRef.current.getAbsolutePosition()
+      );
+    }
+  };
+
+  return (
+    <Engine antialias={true} adaptToDeviceRatio={true} canvasId="sample-canvas">
+      <Scene enablePhysics={[gravityVector, new CannonJSPlugin()]}>
+        <arcRotateCamera name="arc" target={ new Vector3(0, 1, 0) }
+          alpha={-Math.PI / 2} beta={(0.5 + (Math.PI / 4))}
+          radius={4} minZ={0.001} wheelPrecision={50}
+          lowerRadiusLimit={8} upperRadiusLimit={20} upperBetaLimit={Math.PI / 2}
+        />
+        <hemisphericLight name='hemi' direction={new Vector3(0, -1, 0)} intensity={0.8} />
+        <directionalLight name="shadow-light" setDirectionToTarget={[Vector3.Zero()]} direction={Vector3.Zero()} position = {new Vector3(-40, 30, -40)}
+          intensity={0.4} shadowMinZ={1} shadowMaxZ={2500}>
+          <shadowGenerator mapSize={1024} useBlurExponentialShadowMap={true} blurKernel={32}
+            shadowCasters={["sphere1", "dialog"]} forceBackFacesOnly={true} depthScale={100}
+          />
+        </directionalLight>
+        <sphere ref={sphereRef} name="sphere1" diameter={2} segments={16} position={new Vector3(0, 2.5, 0)}>
+          <physicsImpostor type={PhysicsImpostor.SphereImpostor} _options={{
+              mass: 1,
+              restitution: 0.9
+          }} />
+          <plane name="dialog" size={2} position={new Vector3(0, 1.5, 0)}>
+            <advancedDynamicTexture name="dialogTexture" height={1024} width={1024} createForParentMesh={true} hasAlpha={true}>
+              <rectangle name="rect-1" height={0.5} width={1} thickness={12} cornerRadius={12}>
+                  <rectangle>
+                    <babylon-button name="close-icon" background="green" onPointerDownObservable={onButtonClicked}>
+                      <textBlock text={'\uf00d click me'} fontFamily="FontAwesome" fontStyle="bold" fontSize={200} color="white" />
+                    </babylon-button>
+                  </rectangle>
+              </rectangle>
+            </advancedDynamicTexture>
+          </plane>
+        </sphere>
+
+        <ground name="ground1" width={10} height={10} subdivisions={2} receiveShadows={true}>
+          <physicsImpostor type={PhysicsImpostor.BoxImpostor} _options={{
+              mass: 0,
+              restitution: 0.9
+          }} />
+        </ground>
+        <vrExperienceHelper webVROptions={{ createDeviceOrientationCamera: false }} enableInteractions={true} />
+      </Scene>
+    </Engine>
+  );
+}
+```
+
+## Developer Experience and Fast Refresh
+
+With declarative (TSX/JSX) coding and fast refresh, you experience the same development workflow in 3D - ie: save changes in your editor and see them immediately in the browser. Note in this capture when the light is dimmed that the state changes persist even **after** code updates and scene refresh.
+
+![babylon.js Fast Refresh](https://raw.githubusercontent.com/brianzinn/react-babylonjs/master/docs/images/react-babylonjs-hmr.gif)
+
+## API
+
+This project uses code generation, which allows fast reconciliation and excellent typings support.
+
+> [react-babylonjs API](docs/api.md)
+
+## Release History and changes
+
+> [Changes and commit history](docs/changes.md)
+
+## Storybook
+
+~50 sample web pages with viewable source code on [github pages](https://brianzinn.github.io/react-babylonjs/).
+
+## Example Projects
+
+- [Create React App (JavaScript)](https://github.com/brianzinn/create-react-app-babylonjs) CRA JavaScript implementation. Github pages has live examples of typical and declarative usage some with Redux.
+- [Create React App (TypeScript)](https://github.com/brianzinn/create-react-app-typescript-babylonjs) CRA 3 TypeScript. Examples of physics, shadows, etc.
+
+## Contributors
+
+- Huge shout out to [Konsumer](https://github.com/konsumer) that helped bring this project to the next level. The ideas and code sandboxes from issue #6 inspired the code generation and HOC + Context API integration.
+- [seacloud9](https://github.com/seacloud9) for adding [storybook](https://brianzinn.github.io/react-babylonjs/), [GSAP demo](https://brianzinn.github.io/react-babylonjs/?path=/story/integrations--gsap-timeline), [dynamic terrain](https://brianzinn.github.io/react-babylonjs/?path=/story/babylon-basic--dynamic-terrain) (extension) & [PIXI demo](https://brianzinn.github.io/react-babylonjs/?path=/story/integrations--pixi-story).
+- [hookex](https://github.com/hookex) has made the largest contribution :) Proper texture handling [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/textures--image-texture), Node parenting, [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/babylon-basic--transform-node) Full Screen GUI [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/gui--gui-full-screen), Effect Layers [glow demo](https://brianzinn.github.io/react-babylonjs/?path=/story/special-fx--glow-layer), behaviors [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/behaviors--pointer-drag-behavior), useHover & useClick hooks [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/hooks--use-hover-event) and react-spring integration [demo](https://brianzinn.github.io/react-babylonjs/?path=/story/integrations--react-spring). Author of `react-babylon-spring` - https://github.com/hookex/react-babylon-spring.
+- [dennemark](https://github.com/dennemark) add support for `CascadedShadowGenerator`, `createPortal` and `Html` (project HTML in scene - ported from `drei`). Also, stories for [Snippet Material](https://brianzinn.github.io/react-babylonjs/?path=/story/babylon-basic--snippet-material) and ["tunnel" zustand integration](https://brianzinn.github.io/react-babylonjs/?path=/story/integrations--zustand-tunnel).
+- [kencyke](https://github.com/kencyke) created a cool multi-canvas + cloud point repo that insipired creation of `<pointsCloudSystem .../>` as host element.
+- [flostellbrink](https://github.com/flostellbrink) fixed the `react-babylon-spring` integration and added GH action for Storybook ([github pages](https://brianzinn.github.io/react-babylonjs))
+
+> Thanks also to all the people who have contributed with issues/questions/discussions. All the great ideas and requests are why this project evolved beyond an experiment.
+
+Made with ♥