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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
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commit be18bd6573
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+192 -19
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crates/kernel/src/lib.rs
+1 -1
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@@ -50,7 +50,7 @@ mod topo;
pub use blend::{ChamferSide, chamfer, chamfer_sides, fillet};
pub use blend_corner::fillet_radii;
pub use blend_variable::{fillet_chord, fillet_variable};
pub use blend_variable::{fillet_chord, fillet_variable, fillet_variable_points};
pub use body::{Body, EdgeInfo, FaceInfo, FacePaint, Paint};
pub use build::{PathSeg, box_solid, cylinder, extrude, extrude_tapered, loft, revolve, sphere, sweep, torus};
pub use delete_face::delete_faces;