Identifies subsequent transformation matrices that can be used to blend vertices by using the corresponding matrix and a blending (beta) weight value specified in the vertex format.
#define D3DTS_WORLDn #define D3DTS_WORLD1 D3DTS_WORLDMATRIX(1) #define D3DTS_WORLD2 D3DTS_WORLDMATRIX(2) #define D3DTS_WORLD3 D3DTS_WORLDMATRIX(3)
These macros are provided to facilitate porting existing applications to Direct3D 9.