Async process step for a single lines node: compute tolerance, apply
extend_to_all if any, project to 3D (worker or main thread), and
return staged commit data — without mutating any mesh geometry. The
SceneLoader collects these stages, then runs all commits together so
the frame is atomic. signal (the per-update abort signal) reaches the
worker projection so a superseded pass rejects promptly.
Async process step for a single lines node: compute tolerance, apply
extend_to_allif any, project to 3D (worker or main thread), and return staged commit data — without mutating any mesh geometry. The SceneLoader collects these stages, then runs all commits together so the frame is atomic.signal(the per-update abort signal) reaches the worker projection so a superseded pass rejects promptly.