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Class-A surfacing 1/3: the continuity core, a G3 free-form blend and patch crown (#1249)

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The continuity core (kernel bridge: Hermite control rows reproducing a support surface's position, tangent, curvature and change of curvature, G0 to G3), surface.blend between two edge chains (#764), and a crown for fitted patches. Existing patches and fillets are unchanged by default (crown 0 is the plain patch bit for bit). SurfaceBlend and Patch.crown are noted under format 22.
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midasdf authored and GitHub committed 2026-10-15 13:32:16 -04:00
1 parent 4e10c31fdd
commit e8e2ccc8a9
17 files changed
+1687 -56
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crates/kernel/src/tspline.rs
+1 -15
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@@ -42,21 +42,7 @@ fn vertex(h: HPoint) -> Result<mt::Vertex> {
/// One face from a clamped tensor surface, bounded by its four boundary curves.
fn tensor_face(n: &NurbsSurface) -> Result<mt::Face> {
let [nu, nv] = n.count();
let [ku, kv] = n.knots();
let (ku, kv) = (mt::KnotVec::from(ku.clone()), mt::KnotVec::from(kv.clone()));
let corners = [n.point(0, 0), n.point(nu - 1, 0), n.point(nu - 1, nv - 1), n.point(0, nv - 1)];
let v: Vec<mt::Vertex> = corners.into_iter().map(vertex).collect::<Result<_>>()?;
let row = |j: usize| -> Vec<HPoint> { (0..nu).map(|i| n.point(i, j)).collect() };
let column = |i: usize| -> Vec<HPoint> { (0..nv).map(|j| n.point(i, j)).collect() };
let (Some(v0), Some(v1), Some(v2), Some(v3)) = (v.first(), v.get(1), v.get(2), v.get(3)) else { return Err(fail("corners")) };
let edge = |a: &mt::Vertex, b: &mt::Vertex, c: mt::Curve| mt::Edge::try_new(a, b, c).map_err(fail);
let bottom = edge(v0, v1, nurbs_curve(ku.clone(), &row(0))?)?;
let right = edge(v1, v2, nurbs_curve(kv.clone(), &column(nu - 1))?)?;
let top = edge(v3, v2, nurbs_curve(ku.clone(), &row(nv - 1))?)?;
let left = edge(v0, v3, nurbs_curve(kv.clone(), &column(0))?)?;
let wire: mt::Wire = vec![bottom, right, top.inverse(), left.inverse()].into();
mt::Face::try_new(vec![wire], crate::spline_conv::surface(n)?).map_err(fail)
crate::spline_conv::tensor_face(n)
}
/// A parameter point, exact (knot values are shared, so equal points have equal bits).