dotCooCoo 446ccb1fd0 3D and Materials: twisted walls and bevels are drawn back to front ...

At 180° and 360° of twist, Extrude & Bevel and Inflate drew some wall
strips in the wrong order, and a far strip showed through a near one.
Each strip ran the whole length of an outline edge and was sorted by
the depth of its center, while a twisted wall can cross it far from
that center. The caps were sorted the same way.

Twisted walls and bevels are now drawn in pieces about as long as a
wall slice is wide (fewer near the 32,768-facet limit), and twisted
bevel steps turn at most 6° each, as wall slices do. A cap, or
Inflate's flat back, that faces the viewer is drawn after the walls,
and edge-on pieces of a twisted wall keep their own depth. Pieces that
face the viewer are drawn where their strip as a whole faces away, so
a twisted solid seen from behind shows its walls' corners around the
back cap. Untwisted solids give the same facets as on main.

Over 80 twisted squares, the facet seen over a point lay up to 79.7 pt
behind a nearer facet on main and now lies at most 5.0 pt behind.
"Twisted" in 72 pt type, extruded with a 360° twist, takes 12,311
facets instead of 7,622 and 3.1 ms instead of 1.9 ms.

Docs: docs/three-d.md.

2026-10-16 04:04:51 +07:00

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src

3D and Materials: twisted walls and bevels are drawn back to front

2026-10-16 04:04:51 +07:00

Cargo.toml

Effect › 3D and Materials: Extrude & Bevel, Inflate and Rotate

2026-10-13 00:35:07 +07:00