Describes an animation track and specifies blending weight, speed, and position for the track at a given time.
typedef struct D3DXTRACK_DESC {
D3DXPRIORITY_TYPE Priority;
FLOAT Weight;
FLOAT Speed;
DOUBLE Position;
BOOL Enable;
} D3DXTRACK_DESC, *LPD3DXTRACK_DESC;
Tracks with the same priority are blended together, and the two resulting values are then blended using the priority blend factor. A track must have an animation set (stored separately) associated with it.