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feat: add texture aspect correction for non-square textures in UV mapping

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CNCKitchen
2026-04-02 17:23:24 +02:00
parent ccf77c988a
commit 7289c2cabc
4 changed files with 89 additions and 23 deletions
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js/mapping.js
+28 -7
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@@ -104,7 +104,13 @@ export function getCubicBlendWeights(normal, blend, seamBandWidth = 0.35) {
*/
export function computeUV(pos, normal, mode, settings, bounds) {
const { min, size, center } = bounds;
const { scaleU, scaleV, offsetU, offsetV } = settings;
// Compensate for non-square textures: divide scale by aspect correction
// so equal world-space distances produce equal physical texture distances.
const aU = settings.textureAspectU ?? 1;
const aV = settings.textureAspectV ?? 1;
const scaleU = (settings.scaleU) / aU;
const scaleV = (settings.scaleV) / aV;
const { offsetU, offsetV } = settings;
const rotRad = (settings.rotation ?? 0) * Math.PI / 180;
const maxDim = Math.max(size.x, size.y, size.z);
const md = Math.max(maxDim, 1e-6);
@@ -230,9 +236,17 @@ export function computeUV(pos, normal, mode, settings, bounds) {
case MODE_CUBIC: {
const weights = getCubicBlendWeights(normal, settings.mappingBlend ?? 0.0, settings.seamBandWidth ?? 0.35);
const tYZ = applyTransform((pos.y - min.y) / md, (pos.z - min.z) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
const tXZ = applyTransform((pos.x - min.x) / md, (pos.z - min.z) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
const tXY = applyTransform((pos.x - min.x) / md, (pos.y - min.y) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
// Flip U based on normal sign so opposite faces show correct (non-mirrored) text.
// Derived from camera right = view_dir × up_dir for each face orientation (Z-up).
let yzU = (pos.y - min.y) / md;
if (normal.x < 0) yzU = -yzU;
let xzU = (pos.x - min.x) / md;
if (normal.y > 0) xzU = -xzU;
let xyU = (pos.x - min.x) / md;
if (normal.z < 0) xyU = -xyU;
const tYZ = applyTransform(yzU, (pos.z - min.z) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
const tXZ = applyTransform(xzU, (pos.z - min.z) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
const tXY = applyTransform(xyU, (pos.y - min.y) / md, scaleU, scaleV, offsetU, offsetV, rotRad);
if (weights.x > 0.999) return tYZ;
if (weights.y > 0.999) return tXZ;
@@ -263,18 +277,25 @@ export function computeUV(pos, normal, mode, settings, bounds) {
const wy = by / sum;
const wz = bz / sum;
// Flip U based on normal sign so opposite faces show correct (non-mirrored) text.
let yzU = (pos.y - min.y) / md;
if (normal.x < 0) yzU = -yzU;
let xzU = (pos.x - min.x) / md;
if (normal.y > 0) xzU = -xzU;
let xyU = (pos.x - min.x) / md;
if (normal.z < 0) xyU = -xyU;
const uvXY = {
u: (pos.x - min.x) / md,
u: xyU,
v: (pos.y - min.y) / md,
w: wz,
};
const uvXZ = {
u: (pos.x - min.x) / md,
u: xzU,
v: (pos.z - min.z) / md,
w: wy,
};
const uvYZ = {
u: (pos.y - min.y) / md,
u: yzU,
v: (pos.z - min.z) / md,
w: wx,
};