When performing a sweep the user specifies a motion vector, this specifies the direction and magnitude of the path the objects is swept over.
为了执行一次扫掠，用户需要指定一个运动矢量，它指出了方向和将要用于扫掠的路径长度。
When performing a sweep the user specifies a motion vector, this specifies the direction and magnitude of the path the objects is swept over.
为了执行一次扫掠，用户需要指定一个运动矢量，它指出了方向和将要用于扫掠的路径长度。
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