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Clifford GarwoodandClaude Opus 4.7
9a87b96ded
Replace imex_head_transform's fifth argument (Vec3d primary_origin) with a Vec2d primary_zone_center and rewrite the Mirror branch as a true reflection about the plane x = primary_zone_center.x + gantry_offset.x/2. Previous math flipped about the primary's current origin, which: * let the ghost drift out of the target zone as the primary moved, and * made mirrored drag motion track 1:1 with the primary instead of reflecting. The new transform places the ghost at the mirrored position within the target zone (matching where the mirror tool actually prints) and reflects drag so primary +X → ghost -X while Y tracks 1:1 — i.e. the ghost stays a true mirror while the user drags. Off-row Mirror targets (e.g. T3 on a 2x2) still reflect across the same X-plane as on-row peers. PartPlate::calc_imex_ghosts and update_imex_ghost_transforms now feed primary_off (the primary head's zone center) instead of an instance-space Vec3d. Mirror tests rewritten against the new geometric contract: ghost origin at the reflected position, primary drag deltas reflected across the zone-boundary plane. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>