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Their boundary and vertices are in the object's plane (OCS). Only a mirrored plane (0,0,-1) was handled, by flipping x; a tilted plane whose normal points down was taken for a mirror too, and one pointing up kept its plane coordinates, so each face landed turned about the origin by its own angle. A tilted one is now mapped to the WCS and drawn as seen from above at its mean height: bulged edges are flattened (they are elliptical there), and a hatch's pattern direction and origin follow. Its extrusion becomes Z, since its points are plan coordinates now. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>