Quarter-Turn Winder & Spiral Staircase Dancing-Tread .DXF & Headroom Solver

Deterministic Harmonic/trapezoidal dancing-winder tangent redistribution along offset walk-line (r = 500 mm) + 3D vertical headroom clearance ray check engine (.dxf, .step, .pdf) built for Arke, Fontanot, AutoCAD, Archicad — zero-upload ephemeral Wasm RAM execution.

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