普通骨骼动画和蒙皮骨骼动画实现的例子， 适合初学者学习DirectX 3D ，.x格式的 后面还有实现MD3 MD2 的，后面在传-General skeletal bone animation and skinning animation examples of the realization, for beginners to learn DirectX 3D,. X format and there are the realization of the MD3 MD2, behin