Wassim SAMADandClaude Opus 4.7
82c9b5e1df
User reported the slab/fence mesh jittered/teleported continuously
while dragging (not on commit — during the drag). Root cause: the
move tool wrote TWO conflicting values per grid:move tick:
1. `mesh.position.set(deltaX, 0, deltaZ)` — relative offset, direct
Three.js mutation.
2. `useLiveTransforms.set(id, { position: [originalCenter + deltaX,
0, originalCenter + deltaZ], rotation: 0 })` — absolute world
position of the translated polygon center.
`ParametricNodeRenderer` reads `useLiveTransforms` and binds it via
React: `<group position={liveTransform.position}>`. So every Zustand
notification re-rendered the renderer and reconciled the group's
position back to "originalCenter + delta" (the absolute), overriding
the "delta" the direct mutation had just written. The two systems
fought every frame → visible jitter.
Fix: `useLiveTransforms.position` now holds the SAME delta the direct
mutation uses (`[deltaX, 0, deltaZ]`). React reconciles to the same
value the direct mutation already set — no conflict.
The cursor sphere position stays as the translated polygon center
(it's tracked separately via React state, not `useLiveTransforms`).
Ceiling aligned for consistency, though CeilingRenderer doesn't read
`useLiveTransforms` so the value there has no rendering effect.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>