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Error Control
Constrain the positions of the vertices such that they can only move by a certain extent from their original position.

-Balls
A vertex must not move by more than from its original position .
If leaves its ball after a smoothing iteration, it is projected back onto the closest point inside the ball:


Error Slabs
The movement of a vertex is constrained to its original tangent plane. Its position may not deviate from the tangent plane by more than . If it does, it is projected back: