运动的变换不是必须共面的， 也不必须是同心的。
The motion transformation is not necessary coplanar, nor must it be concentric.
当两个物体的面比较接近时，会出现共面的闪烁现象，将大面模型的共面区域掏空。
If the faces of two objects are close enough, the Shared plane will flash.
每一单元具有基底和远侧顶点，当该远侧顶点投影到与该基底共面的平面上时，偏离该基底的中心。
Each unit has a base and a distal apex that is off-center from the base when projected on to a plane that is coplanar with the base.
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