mirror of
https://github.com/CNCKitchen/stlTexturizer.git
synced 2026-04-07 22:11:32 +00:00
feat: enhance displacement preview with face normal and mask attributes for improved rendering
This commit is contained in:
CNCKitchen
+230
-2
@@ -59,6 +59,7 @@ const settings = {
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// ── Displacement preview state ────────────────────────────────────────────────
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let dispPreviewGeometry = null; // subdivided geometry with smoothNormal attribute
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let dispPreviewBusy = false; // true while async subdivision is running
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let dispPreviewParentMap = null; // Int32Array: subdivided face → original face index
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// ── DOM refs ──────────────────────────────────────────────────────────────────
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@@ -561,7 +562,15 @@ function pickTriangle(e) {
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_raycaster.setFromCamera(_canvasNDC(e), getCamera());
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const hits = _raycaster.intersectObject(mesh);
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const hit = getFrontFaceHit(hits, mesh);
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return hit ? hit.faceIndex : -1;
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if (!hit) return -1;
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let fi = hit.faceIndex;
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// When displacement preview is active the mesh uses the subdivided geometry,
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// so the raycaster returns a subdivided face index. Map it back to the
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// original face index so that excludedFaces always stores original indices.
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if (dispPreviewGeometry && mesh.geometry === dispPreviewGeometry && dispPreviewParentMap) {
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fi = dispPreviewParentMap[fi];
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}
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return fi;
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}
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function paintAt(e) {
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@@ -572,7 +581,11 @@ function paintAt(e) {
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const hit = getFrontFaceHit(hits, mesh);
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if (!hit) return;
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const triIdx = hit.faceIndex;
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// Map subdivided → original face index when displacement preview is active
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let triIdx = hit.faceIndex;
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if (dispPreviewGeometry && mesh.geometry === dispPreviewGeometry && dispPreviewParentMap) {
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triIdx = dispPreviewParentMap[triIdx];
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}
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if (brushIsRadius) {
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const hitPt = hits[0].point;
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@@ -607,6 +620,12 @@ function refreshExclusionOverlay() {
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exclCount.textContent = selectionMode
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? t(n === 1 ? 'excl.faceSelected' : 'excl.facesSelected', { n: n.toLocaleString() })
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: t(n === 1 ? 'excl.faceExcluded' : 'excl.facesExcluded', { n: n.toLocaleString() });
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// Update the faceMask attribute on the active preview geometry so the shader
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// reflects user-painted exclusions in real time.
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const activeGeo = (settings.useDisplacement && dispPreviewGeometry)
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? dispPreviewGeometry : currentGeometry;
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updateFaceMask(activeGeo);
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}
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function updateBrushCursor(e) {
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@@ -865,6 +884,176 @@ function checkAmplitudeWarning() {
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amplitudeVal.classList.toggle('amp-danger', danger);
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}
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/**
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* Set (or update) the `faceMask` vertex attribute on a geometry.
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* 1.0 = textured, 0.0 = user-excluded. Angle masking stays in the shader.
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*
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* Always creates a fresh Float32BufferAttribute so that Three.js allocates a
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* new WebGL buffer and uploads the current data. This avoids subtle buffer-
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* caching issues where in-place array edits + needsUpdate could keep stale
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* GPU data on some drivers.
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*/
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function updateFaceMask(geometry) {
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if (!geometry) return;
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const posCount = geometry.attributes.position.count;
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const triCount = posCount / 3;
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const maskArr = new Float32Array(posCount);
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// Fast path: no user exclusion active
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if (excludedFaces.size === 0 && !selectionMode) {
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maskArr.fill(1.0);
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} else {
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const isDisp = (geometry === dispPreviewGeometry && dispPreviewParentMap);
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for (let t = 0; t < triCount; t++) {
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const origFace = isDisp ? dispPreviewParentMap[t] : t;
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const excluded = selectionMode ? !excludedFaces.has(origFace) : excludedFaces.has(origFace);
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const val = excluded ? 0.0 : 1.0;
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maskArr[t * 3] = val;
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maskArr[t * 3 + 1] = val;
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maskArr[t * 3 + 2] = val;
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}
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}
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geometry.setAttribute('faceMask', new THREE.Float32BufferAttribute(maskArr, 1));
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// Ensure faceNormal attribute exists (needed by shader for angle masking).
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// For the original geometry normal == faceNormal; for subdivided geometry
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// addFaceNormals() is called after subdivision, but guard here in case the
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// attribute is still missing.
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if (!geometry.attributes.faceNormal) {
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addFaceNormals(geometry);
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}
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}
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/**
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* Build a mapping from each subdivided face to its nearest original face
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* using a grid-accelerated nearest-centroid lookup, with face normal
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* tiebreaking to prevent boundary faces from being mapped to the wrong
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* original face (e.g. a subdivided face on a cube edge mapped to the
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* adjacent face instead of the correct one).
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*/
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function buildParentFaceMap(subdivGeo) {
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if (!triangleCentroids || !currentGeometry) return null;
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const origPos = currentGeometry.attributes.position.array;
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const origTriCount = currentGeometry.attributes.position.count / 3;
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const subPos = subdivGeo.attributes.position.array;
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const subTriCount = subdivGeo.attributes.position.count / 3;
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// Precompute original face normals
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const origNormals = new Float32Array(origTriCount * 3);
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const _e1 = new THREE.Vector3(), _e2 = new THREE.Vector3(), _fn = new THREE.Vector3();
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for (let t = 0; t < origTriCount; t++) {
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const b = t * 9;
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_e1.set(origPos[b + 3] - origPos[b], origPos[b + 4] - origPos[b + 1], origPos[b + 5] - origPos[b + 2]);
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_e2.set(origPos[b + 6] - origPos[b], origPos[b + 7] - origPos[b + 1], origPos[b + 8] - origPos[b + 2]);
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_fn.crossVectors(_e1, _e2).normalize();
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origNormals[t * 3] = _fn.x; origNormals[t * 3 + 1] = _fn.y; origNormals[t * 3 + 2] = _fn.z;
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}
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// Bounding box of original centroids
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let minX = Infinity, minY = Infinity, minZ = Infinity;
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let maxX = -Infinity, maxY = -Infinity, maxZ = -Infinity;
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for (let i = 0; i < origTriCount; i++) {
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const cx = triangleCentroids[i * 3], cy = triangleCentroids[i * 3 + 1], cz = triangleCentroids[i * 3 + 2];
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if (cx < minX) minX = cx; if (cx > maxX) maxX = cx;
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if (cy < minY) minY = cy; if (cy > maxY) maxY = cy;
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if (cz < minZ) minZ = cz; if (cz > maxZ) maxZ = cz;
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}
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const pad = 1e-3;
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minX -= pad; minY -= pad; minZ -= pad;
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maxX += pad; maxY += pad; maxZ += pad;
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const res = Math.max(4, Math.min(128, Math.ceil(Math.cbrt(origTriCount) * 2)));
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const dx = (maxX - minX) / res || 1;
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const dy = (maxY - minY) / res || 1;
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const dz = (maxZ - minZ) / res || 1;
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// Build spatial grid of original centroids
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const grid = new Map();
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const cellKey = (ix, iy, iz) => (ix * res + iy) * res + iz;
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for (let i = 0; i < origTriCount; i++) {
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const cx = triangleCentroids[i * 3], cy = triangleCentroids[i * 3 + 1], cz = triangleCentroids[i * 3 + 2];
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const ix = Math.max(0, Math.min(res - 1, Math.floor((cx - minX) / dx)));
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const iy = Math.max(0, Math.min(res - 1, Math.floor((cy - minY) / dy)));
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const iz = Math.max(0, Math.min(res - 1, Math.floor((cz - minZ) / dz)));
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const k = cellKey(ix, iy, iz);
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const cell = grid.get(k);
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if (cell) cell.push(i); else grid.set(k, [i]);
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}
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// For each subdivided face, find nearest original face by centroid distance
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// with face-normal tiebreaking to resolve boundary ambiguity.
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const parentMap = new Int32Array(subTriCount);
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for (let st = 0; st < subTriCount; st++) {
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const base = st * 9;
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const sx = (subPos[base] + subPos[base + 3] + subPos[base + 6]) / 3;
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const sy = (subPos[base + 1] + subPos[base + 4] + subPos[base + 7]) / 3;
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const sz = (subPos[base + 2] + subPos[base + 5] + subPos[base + 8]) / 3;
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// Subdivided face normal
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_e1.set(subPos[base + 3] - subPos[base], subPos[base + 4] - subPos[base + 1], subPos[base + 5] - subPos[base + 2]);
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_e2.set(subPos[base + 6] - subPos[base], subPos[base + 7] - subPos[base + 1], subPos[base + 8] - subPos[base + 2]);
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_fn.crossVectors(_e1, _e2).normalize();
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const snx = _fn.x, sny = _fn.y, snz = _fn.z;
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const ix = Math.max(0, Math.min(res - 1, Math.floor((sx - minX) / dx)));
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const iy = Math.max(0, Math.min(res - 1, Math.floor((sy - minY) / dy)));
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const iz = Math.max(0, Math.min(res - 1, Math.floor((sz - minZ) / dz)));
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let bestDist = Infinity, bestIdx = 0;
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// Two-pass: prefer original faces whose normal aligns with the subdivided
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// face (dot > 0.4 ≈ within ~66°), then among those pick the nearest
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// centroid. This prevents boundary faces at sharp seams (cube edges etc.)
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// from being mapped to the adjacent face even when that face's centroid
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// happens to be closer. Falls back to pure nearest-centroid if no
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// normal-matching candidate is found.
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let bestDistAligned = Infinity, bestIdxAligned = -1;
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for (let dix = -1; dix <= 1; dix++) {
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for (let diy = -1; diy <= 1; diy++) {
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for (let diz = -1; diz <= 1; diz++) {
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const nix = ix + dix, niy = iy + diy, niz = iz + diz;
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if (nix < 0 || nix >= res || niy < 0 || niy >= res || niz < 0 || niz >= res) continue;
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const cell = grid.get(cellKey(nix, niy, niz));
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if (!cell) continue;
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for (const oi of cell) {
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const cdx = sx - triangleCentroids[oi * 3];
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const cdy = sy - triangleCentroids[oi * 3 + 1];
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const cdz = sz - triangleCentroids[oi * 3 + 2];
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const centroidDist = cdx * cdx + cdy * cdy + cdz * cdz;
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if (centroidDist < bestDist) { bestDist = centroidDist; bestIdx = oi; }
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const dot = snx * origNormals[oi * 3] + sny * origNormals[oi * 3 + 1] + snz * origNormals[oi * 3 + 2];
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if (dot > 0.4 && centroidDist < bestDistAligned) {
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bestDistAligned = centroidDist; bestIdxAligned = oi;
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}
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}
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}
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}
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}
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// If the local grid search didn't find a normal-aligned original face
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// (common for sparse original meshes like cubes where face centroids
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// are far from the grid cell of a corner-adjacent subdivided face),
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// fall back to a brute-force scan over ALL original faces.
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if (bestIdxAligned < 0) {
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for (let oi = 0; oi < origTriCount; oi++) {
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const cdx = sx - triangleCentroids[oi * 3];
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const cdy = sy - triangleCentroids[oi * 3 + 1];
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const cdz = sz - triangleCentroids[oi * 3 + 2];
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const centroidDist = cdx * cdx + cdy * cdy + cdz * cdz;
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if (centroidDist < bestDist) { bestDist = centroidDist; bestIdx = oi; }
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const dot = snx * origNormals[oi * 3] + sny * origNormals[oi * 3 + 1] + snz * origNormals[oi * 3 + 2];
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if (dot > 0.4 && centroidDist < bestDistAligned) {
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bestDistAligned = centroidDist; bestIdxAligned = oi;
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}
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}
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}
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parentMap[st] = bestIdxAligned >= 0 ? bestIdxAligned : bestIdx;
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}
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return parentMap;
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}
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function updatePreview() {
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if (!currentGeometry || !currentBounds) return;
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@@ -886,6 +1075,9 @@ function updatePreview() {
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? dispPreviewGeometry
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: currentGeometry;
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// Ensure faceMask attribute is current before rendering
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updateFaceMask(activeGeo);
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if (!previewMaterial) {
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previewMaterial = createPreviewMaterial(activeMapEntry.texture, fullSettings);
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loadGeometry(activeGeo, previewMaterial);
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@@ -898,6 +1090,35 @@ function updatePreview() {
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// ── Displacement preview ──────────────────────────────────────────────────────
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/**
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* Compute and set flat geometric face normals as a `faceNormal` attribute.
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* Unlike the `normal` attribute (which may be smooth/interpolated after
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* subdivision), `faceNormal` is always the true per-triangle normal computed
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* from the cross product of the triangle's edges. The shader uses this for
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* angle-based masking so that smooth normals at edges don't cause mask bleeding.
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*/
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function addFaceNormals(geometry) {
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const pos = geometry.attributes.position.array;
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const count = geometry.attributes.position.count;
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const fn = new Float32Array(count * 3);
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const vA = new THREE.Vector3(), vB = new THREE.Vector3(), vC = new THREE.Vector3();
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const e1 = new THREE.Vector3(), e2 = new THREE.Vector3(), n = new THREE.Vector3();
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for (let i = 0; i < count; i += 3) {
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vA.set(pos[i * 3], pos[i * 3 + 1], pos[i * 3 + 2]);
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vB.set(pos[(i+1) * 3], pos[(i+1) * 3 + 1], pos[(i+1) * 3 + 2]);
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vC.set(pos[(i+2) * 3], pos[(i+2) * 3 + 1], pos[(i+2) * 3 + 2]);
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e1.subVectors(vB, vA);
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e2.subVectors(vC, vA);
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n.crossVectors(e1, e2).normalize();
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for (let v = 0; v < 3; v++) {
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fn[(i + v) * 3] = n.x;
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fn[(i + v) * 3 + 1] = n.y;
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fn[(i + v) * 3 + 2] = n.z;
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}
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}
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geometry.setAttribute('faceNormal', new THREE.Float32BufferAttribute(fn, 3));
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}
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/**
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* Compute area-weighted smooth normals for a non-indexed geometry and store
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* them as a `smoothNormal` vec3 attribute. Every copy of the same position
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@@ -970,6 +1191,7 @@ async function toggleDisplacementPreview(enable) {
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// Revert to original geometry with bump-only shading.
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if (currentGeometry && previewMaterial) {
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updateMaterial(previewMaterial, activeMapEntry?.texture, { ...settings, bounds: currentBounds });
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updateFaceMask(currentGeometry);
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setMeshGeometry(currentGeometry);
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}
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// Dispose the subdivided preview geometry (no longer on the mesh)
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@@ -977,6 +1199,7 @@ async function toggleDisplacementPreview(enable) {
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dispPreviewGeometry.dispose();
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dispPreviewGeometry = null;
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}
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dispPreviewParentMap = null;
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return;
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}
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@@ -1003,11 +1226,16 @@ async function toggleDisplacementPreview(enable) {
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);
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addSmoothNormals(subdivided);
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addFaceNormals(subdivided);
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// Dispose previous preview geometry if any
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if (dispPreviewGeometry) dispPreviewGeometry.dispose();
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dispPreviewGeometry = subdivided;
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// Build mapping from subdivided faces → original faces for exclusion masking
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dispPreviewParentMap = buildParentFaceMap(subdivided);
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updateFaceMask(subdivided);
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// Force material recreation so it binds the new geometry with smoothNormal
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if (previewMaterial) {
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previewMaterial.dispose();
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+38
-32
@@ -153,31 +153,37 @@ const vertexShader = /* glsl */`
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precision highp float;
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${sharedGLSL}
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attribute vec3 smoothNormal;
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attribute vec3 smoothNormal;
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attribute vec3 faceNormal;
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attribute float faceMask;
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varying vec3 vModelPos; // ORIGINAL model-space position → UV computation in fragment
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varying vec3 vModelNormal; // model-space face normal → stable UV blending
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varying vec3 vViewPos; // view-space position (possibly displaced) → TBN & specular
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varying vec3 vNormal; // view-space normal → lighting
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varying vec3 vModelPos; // ORIGINAL model-space position → UV computation in fragment
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varying vec3 vModelNormal; // model-space face normal → stable UV blending
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varying vec3 vViewPos; // view-space position (possibly displaced) → TBN & specular
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varying vec3 vNormal; // view-space normal → lighting
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varying float vFaceMask; // combined mask (angle + user exclusion)
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void main() {
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vec3 safeN = length(normal) > 1e-6 ? normalize(normal) : vec3(0.0, 0.0, 1.0);
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// Use the true geometric face normal for angle masking so that
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// smooth/interpolated normals from subdivision don't cause mask bleeding.
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vec3 fN = length(faceNormal) > 1e-6 ? normalize(faceNormal) : safeN;
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vec3 pos = position;
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// Surface angle masking — hard per-face cutoff using flat face normal
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float surfaceAngle = degrees(acos(clamp(abs(fN.z), 0.0, 1.0)));
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float angleMask = 1.0;
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if (fN.z < 0.0 && bottomAngleLimit >= 1.0)
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angleMask = min(angleMask, surfaceAngle > bottomAngleLimit ? 1.0 : 0.0);
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if (fN.z >= 0.0 && topAngleLimit >= 1.0)
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angleMask = min(angleMask, surfaceAngle > topAngleLimit ? 1.0 : 0.0);
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float totalMask = angleMask * faceMask;
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vFaceMask = totalMask;
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if (useDisplacement == 1) {
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// Sample displacement texture using the same UV math as the fragment shader
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float h = computeHeightAtPoint(position, safeN, safeN);
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if (symmetricDisplacement == 1) h = h - 0.5;
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// Surface angle masking (same logic as fragment shader)
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float surfaceAngle = degrees(acos(clamp(abs(safeN.z), 0.0, 1.0)));
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float maskBlend = 1.0;
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float FADE = 15.0;
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if (safeN.z < 0.0 && bottomAngleLimit >= 1.0)
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maskBlend = min(maskBlend, smoothstep(bottomAngleLimit, bottomAngleLimit + FADE, surfaceAngle));
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if (safeN.z >= 0.0 && topAngleLimit >= 1.0)
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maskBlend = min(maskBlend, smoothstep(topAngleLimit, topAngleLimit + FADE, surfaceAngle));
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h = mix(0.0, h, maskBlend);
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h *= totalMask;
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// Displace along smooth normal so all copies of the same position
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// arrive at the same point (watertight, no cracks).
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@@ -187,10 +193,10 @@ const vertexShader = /* glsl */`
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// Always pass the ORIGINAL position for UV computation in the fragment shader.
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vModelPos = position;
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vModelNormal = safeN;
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vModelNormal = fN;
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vec4 mvPos = modelViewMatrix * vec4(pos, 1.0);
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vViewPos = mvPos.xyz;
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vNormal = normalize(normalMatrix * safeN);
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vNormal = normalize(normalMatrix * fN);
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gl_Position = projectionMatrix * mvPos;
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}
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`;
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@@ -199,10 +205,11 @@ const fragmentShader = /* glsl */`
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precision highp float;
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${sharedGLSL}
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varying vec3 vModelPos;
|
||||
varying vec3 vModelNormal;
|
||||
varying vec3 vViewPos;
|
||||
varying vec3 vNormal;
|
||||
varying vec3 vModelPos;
|
||||
varying vec3 vModelNormal;
|
||||
varying vec3 vViewPos;
|
||||
varying vec3 vNormal;
|
||||
varying float vFaceMask;
|
||||
|
||||
// Fragment-only wrapper: compute face-stable projection normal via dFdx
|
||||
// then delegate to the shared height function.
|
||||
@@ -220,20 +227,19 @@ const fragmentShader = /* glsl */`
|
||||
float h = getHeight();
|
||||
if (symmetricDisplacement == 1) h = h - 0.5;
|
||||
|
||||
// ── Surface angle masking ─────────────────────────────────────────────
|
||||
float surfaceAngle = degrees(acos(clamp(abs(vModelNormal.z), 0.0, 1.0)));
|
||||
float maskBlend = 1.0;
|
||||
float FADE = 15.0;
|
||||
if (vModelNormal.z < 0.0 && bottomAngleLimit >= 1.0)
|
||||
maskBlend = min(maskBlend, smoothstep(bottomAngleLimit, bottomAngleLimit + FADE, surfaceAngle));
|
||||
if (vModelNormal.z >= 0.0 && topAngleLimit >= 1.0)
|
||||
maskBlend = min(maskBlend, smoothstep(topAngleLimit, topAngleLimit + FADE, surfaceAngle));
|
||||
h = mix(0.0, h, maskBlend);
|
||||
|
||||
// ── Bump mapping via screen-space height derivatives ──────────────────
|
||||
// Compute derivatives on the RAW (unmasked) height so that screen-space
|
||||
// 2×2 pixel quads spanning masked/unmasked boundaries don't produce
|
||||
// large derivative spikes that bleed bump artifacts across the edge.
|
||||
float dhx = dFdx(h);
|
||||
float dhy = dFdy(h);
|
||||
|
||||
// ── Combined mask (angle + user exclusion) from vertex shader ────────
|
||||
float maskBlend = vFaceMask;
|
||||
h *= maskBlend;
|
||||
dhx *= maskBlend;
|
||||
dhy *= maskBlend;
|
||||
|
||||
vec3 dp1 = dFdx(vViewPos);
|
||||
vec3 dp2 = dFdy(vViewPos);
|
||||
|
||||
|
||||
Reference in New Issue
Block a user