fill_triangles bounded the slab triangulator by edges x slabs, as if every
edge crossed every slab. A ring sampled finely at a close zoom has hundreds
of edges and slabs but only four edges in each slab, so the estimate ran a
hundred times over the hover highlight's budget and the fill was dropped,
leaving only the outline. Count the slabs each edge actually spans instead.
Region2::triangulate tested every edge against every slab, so its work was
the overestimate. It now sweeps upward with the edges crossing the current
slab, giving the same triangles in time proportional to them.
Fixes#164
Co-authored-by: Vitali M. <[email protected]>
Extrude, revolve (partial and full turn), tapered extrude, loft (incl. to a
point), sweep, path sweep, coil, primitives, lip, emboss and thicken attach
the exact history of the bodies they build: each face's profile segment, cap
or operand face, and each edge's operand edge, recorded by topology identity
inside the building call. Nothing is sampled; a body whose faces do not follow
the expected construction carries no history. Face sources are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8
