MxDrawScale3d 被称为"3D比例矢量"，此类用于表示3D空间中比例变换

[ object, uuid(8AEA0088-316E-4317-98E2-62B9A3B1F301), dual, nonextensible, helpstring("IMxDrawScale3d interface"), pointer_default(unique) ]
interface IMxDrawScale3d : IDispatch;