AJ Isaacs d854a1f5d2 fix: use arc joins at convex corners in offset geometry ...

Convex corners were being miter-joined (lines extended to a point)
because IntersectsUnbounded always finds an intersection for non-parallel
lines. Now checks the cross product of original line directions to detect
convex corners and inserts an arc instead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-28 15:53:20 -04:00

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