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TRIMMERs

nurbs-loop

Creates a closed loop of nurbs curves which may be used to trim a surface.
The orientation of the loop decides the type of trimming. In particular if the the orientation is clockwise the loop will be treated as the boundary of the surface, otherwise it will be treated as a hole.


nurbs-loop-set

Creates a hierarchical set of nurbs loops.
Loops may be detached or nested, so as to produce different portions of a surface, possibly with holes.
Loops should never intersect.