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render3d: Schnitt-Modul — Cut-Polygone + sichtbare/verdeckte Kanten aus Prismen

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Analytische Eigen-Engine-Alternative zum OCCT-HLR-Spike: Schnittebene
(Punkt+Normale) gegen extrudierte Fussabdruck-Prismen; Cut-Polygone in
(u,v)-Schnittkoordinaten mit Komponenten-Referenz (spaetere Schraffur),
Projektion der dahinterliegenden Kanten mit Verdeckungstest, getrennt
visible/hidden. SectionOutput serde-serialisierbar (Meter). 26 Tests,
Example section_svg schreibt docs/welle-c-hlr-spike/section-engine-proof.svg
(L-Wand+Bodenplatte: Poché, durchgezogene sichtbare, gestrichelte verdeckte
Kanten). Offene Punkte in docs/design/engine-section-pipeline.md.
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2026-07-03 08:13:57 +02:00
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docs/welle-c-hlr-spike/section-engine-proof.svg
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