Scaling root bone animation on copy part 2

- passing skelDimensionsRatio arg to Bone.copyAnimationRange()
- using this to scale root bone translation, if dimensionsAtRest
property available

This has not been tested.  I do not have .blend(s).  The need for
an arg change makes this PR easier incase changes on PG during testing,
once .babylon wt skeletons which have dimensionsAtRest property are
available.

dist/preview release/what's new.md

@@ -27,6 +27,7 @@
     - Added support for various normal maps conventions ([deltakosh](https://github.com/deltakosh))
     - Added postprocess.enablePixelPerfectMode to avoid texture scaling/stretching when dealing with non-power of 2 resolutions. cannot be used on post-processes chain ([deltakosh](https://github.com/deltakosh))
     - Enabled other post processes to be used when also using a 3D Rig ([jcpalmer](https://github.com/Palmer-JC))
+    - Got Skeleton.copyAminationRange scaling better for different bone lengths ([jcpalmer](https://github.com/Palmer-JC))
     - Added skeleton.getBoneIndexByName(boneName: string) ([dad72](https://github.com/dad72))
     - Added node._children to track children hierarchy ([deltakosh](https://github.com/deltakosh))
     - Added Camera.ForceAttachControlToAlwaysPreventDefault to help embedding Babylon.js in iFrames ([deltakosh](https://github.com/deltakosh))
@@ -60,7 +61,7 @@
     - Unity exporter now support skeletons ([sebavan](https://github.com/sebavan))
     - Support for 3dsmax 2017 ([deltakosh](https://github.com/deltakosh))
     - Added support for up to 8 bones influences per vertex for 3dsmax exporter ([deltakosh](https://github.com/deltakosh))
-    - Added console logging for .babylon file loading ([jcpalmer](https://github.com/Palmer-JC))
+    - Added console logging for .babylon file loading & depreciated SceneLoader.Load() in favor of Append() ([jcpalmer](https://github.com/Palmer-JC))
   - **API doc**
     - class `SolidParticleSystem` documented ([jerome](https://github.com/jbousquie))
     - class `MeshBuilder` documented ([jerome](https://github.com/jbousquie))

src/Bones/babylon.bone.ts

@@ -98,7 +98,7 @@
             this._skeleton._markAsDirty();
         }
 
-        public copyAnimationRange(source: Bone, rangeName: string, frameOffset: number, rescaleAsRequired = false): boolean {
+        public copyAnimationRange(source: Bone, rangeName: string, frameOffset: number, rescaleAsRequired = false, skelDimensionsRatio : Vector3 = null): boolean {
             // all animation may be coming from a library skeleton, so may need to create animation
             if (this.animations.length === 0) {
                 this.animations.push(new Animation(this.name, "_matrix", source.animations[0].framePerSecond, Animation.ANIMATIONTYPE_MATRIX, 0));
@@ -116,25 +116,40 @@
             
             // rescaling prep
             var sourceBoneLength = source.length;
-            var scalingReqd = rescaleAsRequired && sourceBoneLength && this.length && sourceBoneLength !== this.length;
-            var ratio = scalingReqd ? this.length / sourceBoneLength : null;
-
+            var sourceParent = source.getParent();
+            var parent = this.getParent();
+            var parentScalingReqd = rescaleAsRequired && sourceParent && sourceBoneLength && this.length && sourceBoneLength !== this.length;
+            var parentRatio = parentScalingReqd ? parent.length / sourceParent.length : null;
+            
+            var dimensionsScalingReqd = rescaleAsRequired && !parent && skelDimensionsRatio && (skelDimensionsRatio.x !== 1 || skelDimensionsRatio.y !== 1 || skelDimensionsRatio.z !== 1);           
+            
             var destKeys = this.animations[0].getKeys();
             
-            // loop vars declaration / initialization
+            // loop vars declaration
             var orig: { frame: number, value: Matrix };
-            var origScale = scalingReqd ? Vector3.Zero() : null;
-            var origRotation = scalingReqd ? new Quaternion() : null;
-            var origTranslation = scalingReqd ? Vector3.Zero() : null;
+            var origTranslation : Vector3;
             var mat: Matrix;
 
             for (var key = 0, nKeys = sourceKeys.length; key < nKeys; key++) {
                 orig = sourceKeys[key];
                 if (orig.frame >= from && orig.frame <= to) {
-                    if (scalingReqd) {
-                        orig.value.decompose(origScale, origRotation, origTranslation);
-                        origTranslation.scaleInPlace(ratio);
-                        mat = Matrix.Compose(origScale, origRotation, origTranslation);
+                    if (rescaleAsRequired) {
+                        mat = orig.value.clone();
+                        
+                        // scale based on parent ratio, when bone has parent
+                        if (parentScalingReqd) {
+                            origTranslation = mat.getTranslation();
+                            mat.setTranslation(origTranslation.scaleInPlace(parentRatio));
+                            
+                        // scale based on skeleton dimension ratio when root bone, and value is passed
+                        } else if (dimensionsScalingReqd) {
+                            origTranslation = mat.getTranslation();
+                            mat.setTranslation(origTranslation.multiplyInPlace(skelDimensionsRatio));                            
+
+                        // use original when root bone, and no data for skelDimensionsRatio
+                        } else {
+                            mat = orig.value;                            
+                        }
                     } else {
                         mat = orig.value;
                     }

src/Bones/babylon.skeleton.ts

@@ -135,6 +135,8 @@
                 Tools.Warn(`copyAnimationRange: this rig has ${this.bones.length} bones, while source as ${sourceBones.length}`);
                 ret = false;
             }
+            
+            var skelDimensionsRatio = (rescaleAsRequired && this.dimensionsAtRest && source.dimensionsAtRest) ? this.dimensionsAtRest.divide(source.dimensionsAtRest) : null;
 
             for (i = 0, nBones = this.bones.length; i < nBones; i++) {
                 var boneName = this.bones[i].name;