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OneCAD/vendor/truck-stepio/README.md
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bherbruckandClaude Opus 5.5 08cf223ced STEP export: unique ids, plain curves, right revolution senses; seams on split faces
Vendored truck-stepio (writer only): an intersection curve's second surface
was written at the first one's id (duplicate ids for every boolean edge),
and revolved surfaces lost their orientation (the modeling-surface sense was
always true; inverted or mirrored revolutions came out inside out). Export
now writes intersection edges as C1 cubic B-splines through exact points,
so files carry plain 3D curves and no redundant surfaces.

Vendored truck-meshalgo: hinted parameter searches that run off a B-spline's
domain are rejected or clamped (meshing their grid never finished).

STEP import: straight revolution profiles are bounded in the meridian plane
and stop at the axis; loops on revolutions start away from the axis; face
extents include edge end points. Edges between pieces of one split surface
draw as seams.

kernel::step_validate checks a STEP file (duplicate ids, dangling
references, dense numbering); the oracle replay now exports every rebuilt
part, validates it and re-imports it with no warnings and the same volume
(all 32 rebuildable cases pass).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL
2026-10-07 23:40:07 +00:00

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Markdown

# truck-stepio
[![Crates.io](https://img.shields.io/crates/v/truck-stepio.svg)](https://crates.io/crates/truck-stepio) [![Docs.rs](https://docs.rs/truck-stepio/badge.svg)](https://docs.rs/truck-stepio)
Reads/writes STEP files from/to truck.
## Sample Codes
### shape-to-step
convert from truck shape json to step file.
#### usage
```bash
shape-to-step <input shape file> [output shape file]
```
### step-to-mesh
Parse STEP data, extract shape, and meshing.