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Variable-radius fillets through middle points: radii at positions along the edge, straight or smooth between

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kernel::fillet_variable_points(body, edge, start, [(position, radius)...], smooth): the radius law is a B-spline of the edge parameter (straight pieces, or C1 cubic pieces with Catmull-Rom slopes), and since every section's arc is affine in its radius the blend is exactly a rational B-spline (degree 2 across, the law's degree along) with B-spline contact curves on the faces. The largest radius along the edge decides whether the blend fits. Fillet type variable takes mid: [[position, radius expr], ...] and smooth; middle radii are parameters of the feature (Mid radius) and follow user parameters. Tests: straight pieces against (1 - pi/4) L (a^2 + ab + b^2) / 3 per piece, smooth against the integrated law, either end as start, refusals; engine test with a parameter-driven middle radius.

Refs #9

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT
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bherbruckandClaude Opus 5.5 committed 2026-10-10 06:06:33 +00:00
1 parent a7fe0429f0
commit be18bd6573
8 files changed
+192 -19
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crates/doc/src/eval.rs
+6 -2
View File
@@ -2620,11 +2620,15 @@ fn eval_feature(doc: &Document, vals: &BTreeMap<String, Value>, f: &Feature, st:
};
let nb = match &f.kind {
FeatureKind::Fillet { style: crate::FilletStyle::Chord, .. } => kernel::fillet_chord(&mb.body, &edges, r)?,
FeatureKind::Fillet { style: crate::FilletStyle::Variable { radius2, start }, .. } => {
FeatureKind::Fillet { style: crate::FilletStyle::Variable { radius2, start, mid, smooth }, .. } => {
let r2 = val(vals, radius2, Kind::Length)?;
let mut pts = vec![(0.0, r), (1.0, r2)];
for (t, e) in mid {
pts.push((*t, val(vals, e, Kind::Length)?));
}
let mut b = mb.body.clone();
for p in &edges {
b = kernel::fillet_variable(&b, *p, *start, r, r2)?;
b = kernel::fillet_variable_points(&b, *p, *start, &pts, *smooth)?;
}
b
}