User-reported regressions on the 1:1 legacy ports: slab/ceiling moves
were slow (polygon CSG rebuilds per scene.update tick), fence moves
teleported briefly on commit (residual mesh.position offset survived
the geometry rebuild). All three now use the same live-drag pattern
the legacy fence move was designed for:
- During drag, write only to `sceneRegistry.nodes.get(id).position`
+ `useLiveTransforms`. No `scene.update`, no polygon rebuild, no
React re-render of geometry.
- History stays UNPAUSED — scene state isn't changing.
- On commit, a single `scene.update` writes the translated
polygon (or fence start/end + linked-fence cascade). Recorded as one
natural undo step.
- Tools leave `mesh.position` at the drag delta on commit;
GeometrySystem / CeilingSystem reset it to (0,0,0) when they
rebuild the geometry on the next frame. By the time position
clears, the new geometry is in place — no teleport.
Two framework changes enable this:
- `GeometrySystem` (viewer/systems/geometry) now resets
`group.position` + `group.rotation` after every rebuild, matching
the legacy `FenceSystem.updateFenceGeometry` behavior. Tools that
translate the group during live-drag can rely on the reset.
- Legacy `CeilingSystem.updateCeilingGeometry` extends its existing
`position.y` reset to cover X/Z too — previously it left X/Z at the
drag delta after rebuild, double-translating the visual.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
