Used to specify the drive surface reference vector. The purpose of the reference vector is twofold. First, it indicates the material side of the drive surfaces. Second, it indicates the the projection direction of &REFPT onto the drive surfaces.
Characteristics
Write Only - Three Position Numerical Array - Any Real Number
发表于 2011-12-1 21:13:49
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发表于 2011-12-1 21:18:23