void DeleteDecal(int which);
void MakeDecal(decal_type atype, XYZ *where, float *size, float *opacity, float *rotation);
void MakeDecal(decal_type atype, XYZ where, float size, float opacity, float rotation);
void DeleteDecal(int which);
void MakeDecal(decal_type atype, XYZ *where, float *size, float *opacity, float *rotation);
void MakeDecal(decal_type atype, XYZ where, float size, float opacity, float rotation);