For rigid object, the data structures that most collision detection algorithms depend on end in the pre-processing phase.
对于刚体对象，大部分碰撞检测算法所依赖的数据结构都可以在预处理阶段处理完毕。
Phase detection of projected grating is an effective method which can be used to measure the shape of a 3 D object.
投影栅相位法是检测三维曲面形体几何尺寸的较为有效的光学手段。
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