Release 2.15.0

Added

1. Supports morph target animation. (WPF.SharpDX/UWP/Core)
2. Supports animation playback speed. (WPF.SharpDX/UWP/Core)
3. Supports releasing geometry data after loading into GPU. Call Geometry3D.SetAsTransient() to enable this feature. (WPF.SharpDX/UWP/Core) (Restrictions: View only; no hit test support; geometry must not be shared with multiple models; Must enable before attaching geometry3D onto a Model3D/Node, or before the Model3D/node being attached to a viewport.)
4. Supports billboard alignment relative to the origin. (WPF.SharpDX/UWP/Core)
5. Supports animation updater group. (WPF.SharpDX/UWP/Core)
6. Added extension helper method to create animation updaters from animation list. (WPF.SharpDX/UWP/Core)

Improvement

1. Improved thread buffer management. (WPF.SharpDX/UWP/Core)
2. Changed return type for SceneNodeGroupModel3D AddNode RemoveNode. #1443 (WPF.SharpDX/UWP/Core)

Fixed

1. Fixed border highlights and outline blur Post Effect blending issues #1491. (WPF.SharpDX/UWP/Core)
2. Fixed environment map is still being used on object after disabling it. (WPF.SharpDX/UWP/Core)
3. Fixed UWP assimp nuget spec is missing files. #1505 (UWP)
4. Fixed UnmapSubresource is not called after MapSubresource during hit test for bone skinning mesh. #1499 (WPF.SharpDX/UWP/Core)
5. Fixed wrong padding(bottom/right) in billboard single text. #1520 (WPF.SharpDX/UWP/Core)