- Front and back coping tops that differ by 5 mm or more in any segment are
drawn as two coping parts split at the midline between the bearing rows.
Tolerance 5 mm and midline position are the draft assumptions (Q1·Q2).
- Scene extrudes each coping part across its own width.
- solveIp4 computes IP4 as the intersection of the IP1→IP2 line with the
line through IP3 turned by the bend angle (positive = counter-clockwise,
sign convention to be confirmed). Bent coping geometry remains 미실시.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
