mohanki/titan3d_react_node_sqllite
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fix: Align planar UV projection with GLTF spec to fix upside-down textures
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AI Bot
2026-09-22 10:11:54 +05:30
parent 585e6a2032
commit aa5de9f197
1 changed files with 7 additions and 7 deletions
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src/lib/bakingUtils.ts
+7 -7
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@@ -33,7 +33,7 @@ export function reprojectUVs(geometry: THREE.BufferGeometry, mappingType: 'plana
if (mappingType === 'planar') {
// Front planar projection
u = nx;
v = ny;
v = 1.0 - ny;
} else if (mappingType === 'cylinder') {
// Cylindrical projection
const centeredX = x - center.x;
@@ -41,7 +41,7 @@ export function reprojectUVs(geometry: THREE.BufferGeometry, mappingType: 'plana
// atan2 returns -PI to PI. We want 0 to 1 around the cylinder.
let angle = Math.atan2(centeredZ, centeredX);
u = (angle + Math.PI) / (2 * Math.PI);
v = ny;
v = 1.0 - ny;
} else if (mappingType === 'sphere') {
// Spherical projection
const centeredX = x - center.x;
@@ -53,7 +53,7 @@ export function reprojectUVs(geometry: THREE.BufferGeometry, mappingType: 'plana
let theta = Math.atan2(centeredZ, centeredX); // -PI to PI
u = (theta + Math.PI) / (2 * Math.PI);
v = 1.0 - (phi / Math.PI);
v = phi / Math.PI; // 0 at top, 1 at bottom
} else if (mappingType === 'box') {
// Simple box projection (pick dominant axis based on normal)
// This requires normals
@@ -65,11 +65,11 @@ export function reprojectUVs(geometry: THREE.BufferGeometry, mappingType: 'plana
}
const ax = Math.abs(normX), ay = Math.abs(normY), az = Math.abs(normZ);
if (ax > ay && ax > az) {
u = nz; v = ny;
u = nz; v = 1.0 - ny;
} else if (ay > ax && ay > az) {
u = nx; v = nz;
u = nx; v = 1.0 - nz;
} else {
u = nx; v = ny;
u = nx; v = 1.0 - ny;
}
}
@@ -128,7 +128,7 @@ export function bakeTextureToNewUVs(
vOldUV = uv2;
float finalX = mix(uv.x * 2.0 - 1.0, 1.0 - uv.x * 2.0, uFlipX);
float finalY = mix(uv.y * 2.0 - 1.0, 1.0 - uv.y * 2.0, uFlipY);
float finalY = mix(1.0 - uv.y * 2.0, uv.y * 2.0 - 1.0, uFlipY);
gl_Position = vec4(finalX, finalY, 0.0, 1.0);
}