description
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eliminates duplicate points in adjacent
polygons, "welding" them together. in K-3D, points and polygons are separate
entities, and adjacent polygons may or may not share points. The following example
contains two adjacent polygons that dont share points
and when you move one
of the points, the polygons no longer share an edge, creating a "gap":  
by "welding" points together, you eliminate duplicate points, improving
rendering speed and allowing you to move points without creating gaps between polygons:
 
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