Edge::curve_interval (and brep::curve_interval for assemble's edges) gives the interval on the
edge's curve itself: a form circle's angles of its ends, its frame turned by the SMLib conversion
so the angle grows along the NURBS. lip and the ruled surfaces read arcs by it; the hull, the
blend tangents, the patch pcurves, point paths, IGES output and the prism runs evaluate on
Edge::parameters. assemble carries an edge's form through.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
sketch.intersection_curve (LinkSource::Intersection, crates/doc/src/
project.rs) intersected the two bodies' display meshes triangle by triangle
and chained the segments into polylines: a curve known only as points, off
the true intersection by the meshes' chord.
kernel::meeting_edges(a, a_face, b, b_face, chord) takes each side whole or
as one face (that face alone as a surface body, surfaces::taken), tags both
and imprints the first by the second in SMLib (smlib_imprint: "each of its
faces that `tool` meets cut along the intersection", capi/include/smlib.h).
SMLib intersects the faces' surfaces and trims each curve to both faces, so
the edges the imprint makes are exactly where they meet; its own history
says which they are (an edge no edge of either operand became). Each comes
back as its record curve on its interval, from SMLib's export of the
imprinted body, with its points from that body's mesh at `chord`. Sides that
do not meet give none.
The intersection link now stores each edge as a wire with its exact curve
(Wire::exact, the existing WireCurve; no new type or format change), its
points at 1/1000 of the larger body. project3d::mesh_intersection, its
triangle/triangle test and segment chaining go; project3d::mesh_of becomes
part_of (the body and, for a face reference, the face index).
Needs in crates/kernel/src/lib.rs (the coordinator's): `mod intersection;`
and `pub use intersection::{MeetingEdge, meeting_edges};`.
Not built: base in progress (kernel-smlib/no-truck 513ebe47 does not build).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
jyviko