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From Odwiki

The TrailSOP looks at previous frames and allows you to create copies of the geometry at previous frames, generate lines through points from previous frames (called TemporalModelling) or, most commonly, it can compute velocity infomation. This is particularly useful for motion blur purposes.

There is one limitation however - the number of points or the order of the points in the geometry cannot change. It has to have consistent geometry to determine the previous position of surface.

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