Added fixedDragMeshBoundsSize for boundingbox gizmo to size anchors…

dist/preview release/what's new.md

@@ -45,6 +45,7 @@
 - Force compute world matrix of the newly-attached mesh of a ray helper ([RaananW](https://github.com/RaananW))
 - Allow 180 monoscopic videos on top of the video dome ([#8575](https://github.com/BabylonJS/Babylon.js/issues/8575)) ([RaananW](https://github.com/RaananW))
 - Added `AssetContainerTask` support to `AssetsManager` class ([MackeyK24](https://github.com/MackeyK24))
+- Added `fixedDragMeshBoundsSize` for boundingbox gizmo to size anchors from bounds size ([cedricguillemet](https://github.com/cedricguillemet))
 - Changed DeviceSourceManager getInput contract to no longer return nullable values ([Drigax](https://github.com/drigax))
 - Photo Dome and Video Dome now use the same abstract class and support the same parameters ([#8771](https://github.com/BabylonJS/Babylon.js/issues/8771)) ([RaananW](https://github.com/RaananW))
 - Added `getTransformNodesByTags` support to `Scene` class ([MackeyK24](https://github.com/MackeyK24))

src/Gizmos/boundingBoxGizmo.ts

@@ -54,9 +54,14 @@ export class BoundingBoxGizmo extends Gizmo {
     public scaleBoxSize = 0.1;
     /**
      * If set, the rotation spheres and scale boxes will increase in size based on the distance away from the camera to have a consistent screen size (Default: false)
+     * Note : fixedDragMeshScreenSize takes precedence over fixedDragMeshBoundsSize if both are true
      */
     public fixedDragMeshScreenSize = false;
-
+    /**
+     * If set, the rotation spheres and scale boxes will increase in size based on the size of the bounding box
+     * Note : fixedDragMeshScreenSize takes precedence over fixedDragMeshBoundsSize if both are true
+     */
+    public fixedDragMeshBoundsSize = false;
     /**
      * The distance away from the object which the draggable meshes should appear world sized when fixedDragMeshScreenSize is set to true (default: 10)
      */
@@ -353,7 +358,7 @@ export class BoundingBoxGizmo extends Gizmo {
             // Only update the bouding box if scaling has changed
             if (this.attachedMesh && !this._existingMeshScale.equals(this.attachedMesh.scaling)) {
                 this.updateBoundingBox();
-            } else if (this.fixedDragMeshScreenSize) {
+            } else if (this.fixedDragMeshScreenSize || this.fixedDragMeshBoundsSize) {
                 this._updateRotationSpheres();
                 this._updateScaleBoxes();
             }
@@ -491,6 +496,8 @@ export class BoundingBoxGizmo extends Gizmo {
                         rotateSpheres[index].absolutePosition.subtractToRef(this.gizmoLayer.utilityLayerScene.activeCamera.position, this._tmpVector);
                         var distanceFromCamera = this.rotationSphereSize * this._tmpVector.length() / this.fixedDragMeshScreenSizeDistanceFactor;
                         rotateSpheres[index].scaling.set(distanceFromCamera, distanceFromCamera, distanceFromCamera);
+                    } else if (this.fixedDragMeshBoundsSize) {
+                        rotateSpheres[index].scaling.set(this.rotationSphereSize * this._boundingDimensions.x, this.rotationSphereSize * this._boundingDimensions.y, this.rotationSphereSize * this._boundingDimensions.z);
                     } else {
                         rotateSpheres[index].scaling.set(this.rotationSphereSize, this.rotationSphereSize, this.rotationSphereSize);
                     }
@@ -516,6 +523,8 @@ export class BoundingBoxGizmo extends Gizmo {
                             scaleBoxes[index].absolutePosition.subtractToRef(this.gizmoLayer.utilityLayerScene.activeCamera.position, this._tmpVector);
                             var distanceFromCamera = this.scaleBoxSize * this._tmpVector.length() / this.fixedDragMeshScreenSizeDistanceFactor;
                             scaleBoxes[index].scaling.set(distanceFromCamera, distanceFromCamera, distanceFromCamera);
+                        } else if (this.fixedDragMeshBoundsSize) {
+                            scaleBoxes[index].scaling.set(this.scaleBoxSize * this._boundingDimensions.x, this.scaleBoxSize * this._boundingDimensions.y, this.scaleBoxSize * this._boundingDimensions.z);
                         } else {
                             scaleBoxes[index].scaling.set(this.scaleBoxSize, this.scaleBoxSize, this.scaleBoxSize);
                         }