   ID3DXSkinMesh
  it seem to ID3DXSkinMesh is not update in d3d9, when I search msdn, its last document is from d3d8.1. is any other interface instead of it?   
  I know. ID3DXSkinInfo instead of it.but I wanna know how structure of skinmesh?I guess:skinmesh{a list of vertex;//m verticesa list of bone;//n bonesrelation between a list of bone and a list of vertexbuffer(maybe be mxn weights)}Do I guess right?   