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OneCAD/vendor/README.md
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bherbruckandClaude Opus 5.5 1c10d1e56a STEP import: 65/66 Fusion files; bounded meshing
Meshing (vendored truck-meshalgo) works within a budget so hostile files
cannot hang: bounded edge and surface divisions (point caps, depth and
round limits, NaN-safe), and a grid budget per face shared out per shell.
Surface grids refine only the direction that bends; rulings left undivided
get cells comparable to the other direction, so trimmed cylinders (holes,
tee joints) no longer lose volume to long triangles. The helical sweep
imports in 12 s instead of 7 minutes.

Small sphere patches get poles away from them even when the file runs a
seam through the patch (a pyramid's corner blend). Faces the mesher cannot
mesh are reported as import warnings. Test: wild B-spline and far-off
boundaries import in bounded time.

STEP corpus 65/66 (50-sweep-tight-bend: a horn-torus bend whose inner side
collapses to a point; Fusion's own area for it is also off).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL
2026-10-08 01:28:16 +00:00

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Markdown

# Vendored third-party crates
Copies of third-party crates that SolveCraft builds with local fixes, wired in with
`[patch.crates-io]` in the workspace `Cargo.toml`. They keep their own licence; changed lines
are marked `SolveCraft:` in the source.
## truck-shapeops 0.4.0 (Apache-2.0, © RICOS Co. Ltd., https://github.com/ricosjp/truck)
Changes:
- `transversal/integrate/mod.rs`: mesh both shells with `robust_triangulation` (faces made by
earlier booleans have boundaries that lie on their surface only within tolerance).
- `transversal/divide_face/mod.rs`: when projecting a loop onto a face's surface, fall back to
the nearest parameter when the exact search fails (intersection curves are approximations).
- `lib.rs`: `tr!` reports where an operation gives up when `SHAPEOPS_TRACE` is set; compiler
warnings no longer fail the build.
## truck-stepio 0.3.0 (Apache-2.0, © RICOS Co. Ltd., https://github.com/ricosjp/truck)
Only the writer (`out`) is used; SolveCraft reads STEP with its own reader.
Changes:
- `out/geometry.rs`: an `INTERSECTION_CURVE`'s second surface was written at the first
surface's entity index, so every boolean-made edge produced duplicate entity ids.
- `out/geometry.rs`: surfaces of revolution carry the right `same_sense`: truck's revolution
has the same parameterisation and normal as ISO 10303-42 (the writer flipped it), and a
mirroring transform reverses the normal.
- `lib.rs`: compiler warnings no longer fail the build. Example and test targets are dropped
(their sources are not vendored).
## truck-meshalgo 0.4.0 (Apache-2.0, © RICOS Co. Ltd., https://github.com/ricosjp/truck)
Changes:
- `tessellation/triangulation.rs`: parameter searches that land outside a surface's bounded,
non-periodic domain are rejected (a hinted B-spline search can run off and extrapolate to
thousands of parameter units, and meshing that grid never finishes); the last-resort nearest
search is clamped into the domain.
- `tessellation/triangulation.rs`, bounded work (hostile files must not hang): edge polylines
and surface grids come from our own bounded divisions (at most 20 000 points per edge, a
grid budget per face shared out of 10 million points per shell, 24 refinement rounds; a
point that does not evaluate counts as flat instead of recursing). Surface grids refine only
the direction that bends, and a ruling left undivided gets cells comparable to the other
direction (long triangles from a trim loop to the grid's far ends cut through cylinders).
- `lib.rs`: compiler warnings no longer fail the build. Example, test and bench targets are
dropped (their sources are not vendored).