Support of pose animation

[gongminmin]

(Migrated from wishlist)

Requested by cin.

Add support of pose animation (vertex and normal with any weight). Example: We have original model and and two "shots" with different positions of some vertex. In model we have "animation track" which contains weights on different time. When engine play the track, it get interpolated weight and compute new vertexes positions relative by original. Also interpolated normals. (May be this need do more better than I wrote :)

[DormancyBear]

关于 Pose Animation，我就找到了这个描述OGRE: Animation，看最终所要实现的效果，有点像 BlendShapes（之前在 Unity 上瞄过 UnityChan 的面部表情动画，就是对 SMILE1、SMILE2、SAP 等 6 个极端表情分别赋以权值来 blend 得到最终表情），不知道理解得对不对。
之前确实没有接触过这方面，但想学习一下，能参与进这一功能的开发吗。。

[gongminmin]

是的，就是这样的blend shape。