A new crate, solidcraft-step (L1, no modelling backend), holds the Part 21
parser (moved from the kernel, which now reads through it) and STEP geometry
as plain data: lines, conics, B-splines (rational and implied knots),
polylines, trimmed curves, surface curves with their pcurves, 3D offset
curves; planes, cylinders, cones, spheres, tori (degenerate too), B-spline
surfaces, revolutions, linear extrusions, offset and rectangular trimmed
surfaces. Each keeps STEP's own definition and parameterisation, in mm and
radians, with pcurves scaled by their surface's parameter units. Shared
entities stay shared. A writer emits the same entities back, deduplicated.
Tests per entity check values against analytic points, units, round trips
and hostile input; an ignored test reads and round-trips every edge curve
and face surface of the tangency-labs/models STEP files.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brennen HerbruckandClaude Opus 5.5
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