Sets the priority blending weight used by the animation controller.
HRESULT SetPriorityBlend( FLOAT BlendWeight );
If the method succeeds, the return value is S_OK. If the method fails, the return value can be one of the following values: D3DERR_INVALIDCALL.
The blend weight is used to blend high and low priority tracks together.
Header: Declared in D3dx9anim.h.