Merge pull request #552 from BabylonJS/drigax/fix_549

Make baked animations get excluded in export if they aren't relevant within group frame range.

Author: Drigax

Maya/Exporter/BabylonExporter.GLTFExporter.Animation.cs

@@ -161,8 +161,20 @@ private void ExportNodeAnimation(GLTFAnimation gltfAnimation, int startFrame, in
 
                     // Optimization process always keeps first and last frames
                     OptimizeAnimations(keysInRangeFull, true);
+                    bool keysInRangeAreRelevant = IsAnimationKeysRelevant(keysInRangeFull, babylonAnimation.property);
+
+                    // if we are baking the animation frames, then do a less efficient check against all frames in the scene for this animation channel if the first check fails.
+                    if (!keysInRangeAreRelevant && _bakeAnimationFrames)
+                    {
+                        List<BabylonAnimationKey> optimizedKeysFull = new List<BabylonAnimationKey>(babylonAnimation.keysFull);
+                        OptimizeAnimations(optimizedKeysFull, true);
+                        keysInRangeAreRelevant = IsAnimationKeysRelevant(optimizedKeysFull, babylonAnimation.property);
+                    }
 
-                    if (IsAnimationKeysRelevant(keysInRangeFull, babylonAnimation.property))
+                    // If we have any significant animation keys in this channel
+                    // (or if we are baking the animation track and have any relevant (non-identity) animation keys in the whole track)
+                    // then add the optimized keys in range to the animation track
+                    if (keysInRangeAreRelevant)
                     {
                         // Override animation keys
                         babylonAnimation.keys = keysInRangeFull.ToArray();