Fillet

Status: Implemented

Fillet replaces selected edges on a single solid with a constant-radius blend generated by BREP.filletSolid.

Inputs

• edges – pick edges directly or select faces to expand into their boundary edges.
• radius – constant radius applied to every edge.
• resolution – number of segments around the fillet tube; increase for smoother large radii.
• inflate – offsets tangency curves and end caps to avoid coplanar leftovers; closed loops skip the wedge inset to avoid self‑intersection.
• direction – INSET cuts material, OUTSET unions material back.
• combineEdges – OUTSET-only; hulls fillet ends that share a vertex so corner seams stay closed.
• showTangentOverlays – adds pre-inflate tangency polylines to the helper tube for debugging.
• debug – keeps helper bodies visible and logs extra diagnostics.

Behaviour

• All selected edges must belong to the same solid; face picks expand to boundary edges before the builder runs.
• Helper tube/wedge bodies are generated per edge and booleaned in sequence (union for OUTSET, subtract for INSET). When combineEdges is enabled, shared OUTSET corners are hulled together before the boolean to close gaps.
• Closed-loop paths suppress the wedge inset used for INSET cuts so the cutter does not self-intersect; tangency offsets still keep the fillet slightly inflated to avoid coplanar seams.
• On success the original solid is replaced by the blended result. Enabling debug leaves the helper tube/wedge (and any corner hulls or tangent overlays) in the scene for inspection.