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feat: improve cubic mapping handling for better texture consistency on seams

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CNCKitchen
2026-03-19 14:04:12 +01:00
parent 32cc538bfb
commit e555a479fb
1 changed files with 10 additions and 2 deletions
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js/displacement.js
+10 -2
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@@ -177,12 +177,20 @@ export function applyDisplacement(geometry, imageData, imgWidth, imgHeight, sett
const sn = smoothNrmMap.get(k);
// Cubic at sharp seams: zone-area-weighted sampling with a stable per-face dominant axis.
// Cubic: zone-area-weighted sampling with a stable per-face dominant axis.
// Non-seam vertices use their single zone purely; seam-edge vertices that
// adjoin two zones get a face-area-proportional blend. This guarantees all
// three vertices of every triangle receive consistent displacement, making
// the mesh watertight with no mixed-projection artefact rows at the seam.
if (settings.mappingMode === 6 /* MODE_CUBIC */ && (settings.mappingBlend ?? 0) < 0.001) {
//
// Always use this path regardless of mappingBlend. The smooth normals from
// subdivision can be wrong on thin structures (e.g. a flat base plate) where
// top (0,0,1) and bottom (0,0,-1) face normals cancel at shared edge vertices,
// leaving a horizontal smooth normal. computeUV would then pick the wrong
// cubic projection axis, making those faces appear untextured. The face-
// normal-based zoneAreaMap is immune to this because it classifies faces by
// their geometric cross-product normal, not the averaged vertex normal.
if (settings.mappingMode === 6 /* MODE_CUBIC */) {
const za = zoneAreaMap.get(k);
const total = za ? za[0] + za[1] + za[2] : 0;
if (total > 0) {