typedef struct {
    DWORD     dwSize;
    D3DVECTOR  vPosition;
    D3DVECTOR  vVelocity;
    DWORD     dwInsideConeAngle;
    DWORD     dwOutsideConeAngle;
    D3DVECTOR  vConeOrientation;
    LONG      lConeOutsideVolume;
    D3DVALUE     flMinDistance;
    D3DVALUE     flMaxDistance;
    DWORD     dwMode;
} DS3DBUFFER;
