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fix: flip ComputeNormal for CCW arcs on concave contour features

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CCW arcs (e.g. the top of a U-slot) had the radial normal pointing
into the part material instead of into the scrap. This caused the
lead-in preview to flip sides on concave features.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-31 17:37:26 -04:00
parent e8fe01aea2
commit c1f1c829dc
1 changed files with 6 additions and 0 deletions
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6
OpenNest.Core/CNC/CuttingStrategy/ContourCuttingStrategy.cs
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@@ -169,6 +169,12 @@ namespace OpenNest.CNC.CuttingStrategy
{ {
// Radial direction from center to point // Radial direction from center to point
normal = point.AngleFrom(arc.Center); normal = point.AngleFrom(arc.Center);
// For CCW arcs the radial points the wrong way — flip it.
// CW arcs are convex features (corners) where radial = outward.
// CCW arcs are concave features (slots) where radial = inward.
if (arc.Rotation == RotationType.CCW)
normal += System.Math.PI;
} }
else if (entity is Circle circle) else if (entity is Circle circle)
{ {