jyviko c070f044ab STEP import: a torus face round most of its tube is formed within one turn of it ...

A torus face covering most of its tube off the tube's quarter lines (an
exhaust collector's bend: 326° of the tube from −113.8°) needed a fifth
quarter along the tube, which STEP counts from the outer equator: its form
ran past a full turn of the tube and SMLib refused the solid. #8496 turns
frames about the axis only, and the torus label had no tube reference.

The torus label gets a tube start (`tube_start`, radians; 0 and left out
of the record by default, so older records mean what they did): v counts
from there, in every evaluator, form, pcurve, iso curve, tessellation,
placement, SSI and SMLib transfer. A spilling torus face's tube start moves
to where its tube begins, or a turn before where it ends, whichever puts
its tube circles on the grid of a round face they are about the axis of
(a pipe's cylinder meeting the bend); circles round the tube are labelled
from the tube start (brep::form::on_tube), so their forms and pcurves lie
on the face's quarter grid exactly. The saved-format change is one file,
crates/doc/src/format/pending/torus-tube-start.rs.

Engine assembly: COLLECTOR_EXHAUST_VER_1 now comes in as a closed solid
(refused 3 -> 2); Poppy Humanoid unchanged (4).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-28 21:22:11 -04:00

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topology.rs

STEP import: a torus face round most of its tube is formed within one turn of it

2026-10-28 21:22:11 -04:00