Added geometry utils
This commit is contained in:
Paul Graffam
parent
a73b163e4e
commit
76a7367be6
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@ -0,0 +1,702 @@
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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import {
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BufferAttribute,
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BufferGeometry,
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InterleavedBuffer,
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InterleavedBufferAttribute,
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TriangleFanDrawMode,
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TriangleStripDrawMode,
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TrianglesDrawMode,
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Vector2,
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Vector3,
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} from 'three';
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var BufferGeometryUtils = {
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computeTangents: function (geometry) {
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var index = geometry.index;
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var attributes = geometry.attributes;
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// based on http://www.terathon.com/code/tangent.html
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// (per vertex tangents)
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if (
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index === null ||
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attributes.position === undefined ||
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attributes.normal === undefined ||
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attributes.uv === undefined
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) {
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console.error(
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'THREE.BufferGeometryUtils: .computeTangents() failed. Missing required attributes (index, position, normal or uv)'
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);
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return;
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}
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var indices = index.array;
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var positions = attributes.position.array;
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var normals = attributes.normal.array;
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var uvs = attributes.uv.array;
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var nVertices = positions.length / 3;
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if (attributes.tangent === undefined) {
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geometry.setAttribute('tangent', new BufferAttribute(new Float32Array(4 * nVertices), 4));
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}
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var tangents = attributes.tangent.array;
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var tan1 = [],
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tan2 = [];
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for (var i = 0; i < nVertices; i++) {
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tan1[i] = new Vector3();
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tan2[i] = new Vector3();
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}
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var vA = new Vector3(),
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vB = new Vector3(),
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vC = new Vector3(),
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uvA = new Vector2(),
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uvB = new Vector2(),
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uvC = new Vector2(),
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sdir = new Vector3(),
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tdir = new Vector3();
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function handleTriangle(a, b, c) {
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vA.fromArray(positions, a * 3);
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vB.fromArray(positions, b * 3);
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vC.fromArray(positions, c * 3);
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uvA.fromArray(uvs, a * 2);
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uvB.fromArray(uvs, b * 2);
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uvC.fromArray(uvs, c * 2);
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vB.sub(vA);
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vC.sub(vA);
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uvB.sub(uvA);
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uvC.sub(uvA);
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var r = 1.0 / (uvB.x * uvC.y - uvC.x * uvB.y);
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// silently ignore degenerate uv triangles having coincident or colinear vertices
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if (!isFinite(r)) return;
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sdir.copy(vB).multiplyScalar(uvC.y).addScaledVector(vC, -uvB.y).multiplyScalar(r);
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tdir.copy(vC).multiplyScalar(uvB.x).addScaledVector(vB, -uvC.x).multiplyScalar(r);
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tan1[a].add(sdir);
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tan1[b].add(sdir);
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tan1[c].add(sdir);
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tan2[a].add(tdir);
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tan2[b].add(tdir);
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tan2[c].add(tdir);
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}
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var groups = geometry.groups;
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if (groups.length === 0) {
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groups = [
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{
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start: 0,
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count: indices.length,
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},
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];
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}
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for (var i = 0, il = groups.length; i < il; ++i) {
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var group = groups[i];
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var start = group.start;
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var count = group.count;
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for (var j = start, jl = start + count; j < jl; j += 3) {
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handleTriangle(indices[j + 0], indices[j + 1], indices[j + 2]);
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}
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}
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var tmp = new Vector3(),
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tmp2 = new Vector3();
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var n = new Vector3(),
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n2 = new Vector3();
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var w, t, test;
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function handleVertex(v) {
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n.fromArray(normals, v * 3);
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n2.copy(n);
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t = tan1[v];
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// Gram-Schmidt orthogonalize
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tmp.copy(t);
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tmp.sub(n.multiplyScalar(n.dot(t))).normalize();
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// Calculate handedness
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tmp2.crossVectors(n2, t);
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test = tmp2.dot(tan2[v]);
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w = test < 0.0 ? -1.0 : 1.0;
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tangents[v * 4] = tmp.x;
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tangents[v * 4 + 1] = tmp.y;
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tangents[v * 4 + 2] = tmp.z;
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tangents[v * 4 + 3] = w;
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}
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for (var i = 0, il = groups.length; i < il; ++i) {
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var group = groups[i];
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var start = group.start;
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var count = group.count;
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for (var j = start, jl = start + count; j < jl; j += 3) {
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handleVertex(indices[j + 0]);
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handleVertex(indices[j + 1]);
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handleVertex(indices[j + 2]);
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}
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}
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},
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/**
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* @param {Array<BufferGeometry>} geometries
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* @param {Boolean} useGroups
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* @return {BufferGeometry}
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*/
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mergeBufferGeometries: function (geometries, useGroups) {
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var isIndexed = geometries[0].index !== null;
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var attributesUsed = new Set(Object.keys(geometries[0].attributes));
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var morphAttributesUsed = new Set(Object.keys(geometries[0].morphAttributes));
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var attributes = {};
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var morphAttributes = {};
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var morphTargetsRelative = geometries[0].morphTargetsRelative;
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var mergedGeometry = new BufferGeometry();
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var offset = 0;
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for (var i = 0; i < geometries.length; ++i) {
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var geometry = geometries[i];
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var attributesCount = 0;
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// ensure that all geometries are indexed, or none
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if (isIndexed !== (geometry.index !== null)) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. All geometries must have compatible attributes; make sure index attribute exists among all geometries, or in none of them.'
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);
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return null;
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}
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// gather attributes, exit early if they're different
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for (var name in geometry.attributes) {
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if (!attributesUsed.has(name)) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. All geometries must have compatible attributes; make sure "' +
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name +
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'" attribute exists among all geometries, or in none of them.'
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);
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return null;
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}
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if (attributes[name] === undefined) attributes[name] = [];
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attributes[name].push(geometry.attributes[name]);
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attributesCount++;
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}
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// ensure geometries have the same number of attributes
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if (attributesCount !== attributesUsed.size) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. Make sure all geometries have the same number of attributes.'
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);
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return null;
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}
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// gather morph attributes, exit early if they're different
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if (morphTargetsRelative !== geometry.morphTargetsRelative) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. .morphTargetsRelative must be consistent throughout all geometries.'
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);
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return null;
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}
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for (var name in geometry.morphAttributes) {
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if (!morphAttributesUsed.has(name)) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. .morphAttributes must be consistent throughout all geometries.'
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);
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return null;
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}
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if (morphAttributes[name] === undefined) morphAttributes[name] = [];
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morphAttributes[name].push(geometry.morphAttributes[name]);
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}
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// gather .userData
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mergedGeometry.userData.mergedUserData = mergedGeometry.userData.mergedUserData || [];
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mergedGeometry.userData.mergedUserData.push(geometry.userData);
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if (useGroups) {
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var count;
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if (isIndexed) {
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count = geometry.index.count;
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} else if (geometry.attributes.position !== undefined) {
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count = geometry.attributes.position.count;
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} else {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' +
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i +
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'. The geometry must have either an index or a position attribute'
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);
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return null;
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}
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mergedGeometry.addGroup(offset, count, i);
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offset += count;
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}
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}
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// merge indices
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if (isIndexed) {
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var indexOffset = 0;
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var mergedIndex = [];
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for (var i = 0; i < geometries.length; ++i) {
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var index = geometries[i].index;
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for (var j = 0; j < index.count; ++j) {
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mergedIndex.push(index.getX(j) + indexOffset);
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}
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indexOffset += geometries[i].attributes.position.count;
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}
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mergedGeometry.setIndex(mergedIndex);
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}
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// merge attributes
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for (var name in attributes) {
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var mergedAttribute = this.mergeBufferAttributes(attributes[name]);
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if (!mergedAttribute) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' +
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name +
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' attribute.'
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);
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return null;
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}
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mergedGeometry.setAttribute(name, mergedAttribute);
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}
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// merge morph attributes
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for (var name in morphAttributes) {
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var numMorphTargets = morphAttributes[name][0].length;
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if (numMorphTargets === 0) break;
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mergedGeometry.morphAttributes = mergedGeometry.morphAttributes || {};
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mergedGeometry.morphAttributes[name] = [];
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for (var i = 0; i < numMorphTargets; ++i) {
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var morphAttributesToMerge = [];
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for (var j = 0; j < morphAttributes[name].length; ++j) {
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morphAttributesToMerge.push(morphAttributes[name][j][i]);
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}
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var mergedMorphAttribute = this.mergeBufferAttributes(morphAttributesToMerge);
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if (!mergedMorphAttribute) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' +
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name +
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' morphAttribute.'
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);
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return null;
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}
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mergedGeometry.morphAttributes[name].push(mergedMorphAttribute);
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}
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}
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return mergedGeometry;
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},
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/**
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* @param {Array<BufferAttribute>} attributes
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* @return {BufferAttribute}
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*/
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mergeBufferAttributes: function (attributes) {
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var TypedArray;
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var itemSize;
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var normalized;
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var arrayLength = 0;
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for (var i = 0; i < attributes.length; ++i) {
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var attribute = attributes[i];
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if (attribute.isInterleavedBufferAttribute) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. InterleavedBufferAttributes are not supported.'
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);
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return null;
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}
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if (TypedArray === undefined) TypedArray = attribute.array.constructor;
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if (TypedArray !== attribute.array.constructor) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.array must be of consistent array types across matching attributes.'
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);
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return null;
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}
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if (itemSize === undefined) itemSize = attribute.itemSize;
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if (itemSize !== attribute.itemSize) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.itemSize must be consistent across matching attributes.'
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);
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return null;
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}
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if (normalized === undefined) normalized = attribute.normalized;
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if (normalized !== attribute.normalized) {
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console.error(
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'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. BufferAttribute.normalized must be consistent across matching attributes.'
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);
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return null;
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}
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arrayLength += attribute.array.length;
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}
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var array = new TypedArray(arrayLength);
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var offset = 0;
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for (var i = 0; i < attributes.length; ++i) {
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array.set(attributes[i].array, offset);
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offset += attributes[i].array.length;
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}
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return new BufferAttribute(array, itemSize, normalized);
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},
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/**
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* @param {Array<BufferAttribute>} attributes
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* @return {Array<InterleavedBufferAttribute>}
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*/
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interleaveAttributes: function (attributes) {
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// Interleaves the provided attributes into an InterleavedBuffer and returns
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// a set of InterleavedBufferAttributes for each attribute
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var TypedArray;
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var arrayLength = 0;
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var stride = 0;
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// calculate the the length and type of the interleavedBuffer
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for (var i = 0, l = attributes.length; i < l; ++i) {
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var attribute = attributes[i];
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if (TypedArray === undefined) TypedArray = attribute.array.constructor;
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if (TypedArray !== attribute.array.constructor) {
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console.error('AttributeBuffers of different types cannot be interleaved');
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return null;
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}
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arrayLength += attribute.array.length;
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stride += attribute.itemSize;
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}
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// Create the set of buffer attributes
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var interleavedBuffer = new InterleavedBuffer(new TypedArray(arrayLength), stride);
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var offset = 0;
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var res = [];
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var getters = ['getX', 'getY', 'getZ', 'getW'];
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var setters = ['setX', 'setY', 'setZ', 'setW'];
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for (var j = 0, l = attributes.length; j < l; j++) {
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var attribute = attributes[j];
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var itemSize = attribute.itemSize;
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var count = attribute.count;
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var iba = new InterleavedBufferAttribute(
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interleavedBuffer,
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itemSize,
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offset,
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attribute.normalized
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);
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res.push(iba);
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offset += itemSize;
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// Move the data for each attribute into the new interleavedBuffer
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// at the appropriate offset
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for (var c = 0; c < count; c++) {
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for (var k = 0; k < itemSize; k++) {
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iba[setters[k]](c, attribute[getters[k]](c));
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}
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}
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}
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return res;
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},
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/**
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* @param {Array<BufferGeometry>} geometry
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* @return {number}
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*/
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estimateBytesUsed: function (geometry) {
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// Return the estimated memory used by this geometry in bytes
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// Calculate using itemSize, count, and BYTES_PER_ELEMENT to account
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// for InterleavedBufferAttributes.
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var mem = 0;
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for (var name in geometry.attributes) {
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var attr = geometry.getAttribute(name);
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mem += attr.count * attr.itemSize * attr.array.BYTES_PER_ELEMENT;
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}
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var indices = geometry.getIndex();
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mem += indices ? indices.count * indices.itemSize * indices.array.BYTES_PER_ELEMENT : 0;
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return mem;
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},
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/**
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* @param {BufferGeometry} geometry
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* @param {number} tolerance
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* @return {BufferGeometry>}
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*/
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mergeVertices: function (geometry, tolerance = 1e-4) {
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tolerance = Math.max(tolerance, Number.EPSILON);
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// Generate an index buffer if the geometry doesn't have one, or optimize it
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// if it's already available.
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var hashToIndex = {};
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var indices = geometry.getIndex();
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var positions = geometry.getAttribute('position');
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var vertexCount = indices ? indices.count : positions.count;
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// next value for triangle indices
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var nextIndex = 0;
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// attributes and new attribute arrays
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var attributeNames = Object.keys(geometry.attributes);
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var attrArrays = {};
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var morphAttrsArrays = {};
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var newIndices = [];
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var getters = ['getX', 'getY', 'getZ', 'getW'];
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// initialize the arrays
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for (var i = 0, l = attributeNames.length; i < l; i++) {
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var name = attributeNames[i];
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attrArrays[name] = [];
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var morphAttr = geometry.morphAttributes[name];
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if (morphAttr) {
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morphAttrsArrays[name] = new Array(morphAttr.length).fill().map(() => []);
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}
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}
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// convert the error tolerance to an amount of decimal places to truncate to
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var decimalShift = Math.log10(1 / tolerance);
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var shiftMultiplier = Math.pow(10, decimalShift);
|
||||
for (var i = 0; i < vertexCount; i++) {
|
||||
var index = indices ? indices.getX(i) : i;
|
||||
|
||||
// Generate a hash for the vertex attributes at the current index 'i'
|
||||
var hash = '';
|
||||
for (var j = 0, l = attributeNames.length; j < l; j++) {
|
||||
var name = attributeNames[j];
|
||||
var attribute = geometry.getAttribute(name);
|
||||
var itemSize = attribute.itemSize;
|
||||
|
||||
for (var k = 0; k < itemSize; k++) {
|
||||
// double tilde truncates the decimal value
|
||||
hash += `${~~(attribute[getters[k]](index) * shiftMultiplier)},`;
|
||||
}
|
||||
}
|
||||
|
||||
// Add another reference to the vertex if it's already
|
||||
// used by another index
|
||||
if (hash in hashToIndex) {
|
||||
newIndices.push(hashToIndex[hash]);
|
||||
} else {
|
||||
// copy data to the new index in the attribute arrays
|
||||
for (var j = 0, l = attributeNames.length; j < l; j++) {
|
||||
var name = attributeNames[j];
|
||||
var attribute = geometry.getAttribute(name);
|
||||
var morphAttr = geometry.morphAttributes[name];
|
||||
var itemSize = attribute.itemSize;
|
||||
var newarray = attrArrays[name];
|
||||
var newMorphArrays = morphAttrsArrays[name];
|
||||
|
||||
for (var k = 0; k < itemSize; k++) {
|
||||
var getterFunc = getters[k];
|
||||
newarray.push(attribute[getterFunc](index));
|
||||
|
||||
if (morphAttr) {
|
||||
for (var m = 0, ml = morphAttr.length; m < ml; m++) {
|
||||
newMorphArrays[m].push(morphAttr[m][getterFunc](index));
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
hashToIndex[hash] = nextIndex;
|
||||
newIndices.push(nextIndex);
|
||||
nextIndex++;
|
||||
}
|
||||
}
|
||||
|
||||
// Generate typed arrays from new attribute arrays and update
|
||||
// the attributeBuffers
|
||||
const result = geometry.clone();
|
||||
for (var i = 0, l = attributeNames.length; i < l; i++) {
|
||||
var name = attributeNames[i];
|
||||
var oldAttribute = geometry.getAttribute(name);
|
||||
|
||||
var buffer = new oldAttribute.array.constructor(attrArrays[name]);
|
||||
var attribute = new BufferAttribute(buffer, oldAttribute.itemSize, oldAttribute.normalized);
|
||||
|
||||
result.setAttribute(name, attribute);
|
||||
|
||||
// Update the attribute arrays
|
||||
if (name in morphAttrsArrays) {
|
||||
for (var j = 0; j < morphAttrsArrays[name].length; j++) {
|
||||
var oldMorphAttribute = geometry.morphAttributes[name][j];
|
||||
|
||||
var buffer = new oldMorphAttribute.array.constructor(morphAttrsArrays[name][j]);
|
||||
var morphAttribute = new BufferAttribute(
|
||||
buffer,
|
||||
oldMorphAttribute.itemSize,
|
||||
oldMorphAttribute.normalized
|
||||
);
|
||||
result.morphAttributes[name][j] = morphAttribute;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// indices
|
||||
|
||||
result.setIndex(newIndices);
|
||||
|
||||
return result;
|
||||
},
|
||||
|
||||
/**
|
||||
* @param {BufferGeometry} geometry
|
||||
* @param {number} drawMode
|
||||
* @return {BufferGeometry>}
|
||||
*/
|
||||
toTrianglesDrawMode: function (geometry, drawMode) {
|
||||
if (drawMode === TrianglesDrawMode) {
|
||||
console.warn(
|
||||
'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Geometry already defined as triangles.'
|
||||
);
|
||||
return geometry;
|
||||
}
|
||||
|
||||
if (drawMode === TriangleFanDrawMode || drawMode === TriangleStripDrawMode) {
|
||||
var index = geometry.getIndex();
|
||||
|
||||
// generate index if not present
|
||||
|
||||
if (index === null) {
|
||||
var indices = [];
|
||||
|
||||
var position = geometry.getAttribute('position');
|
||||
|
||||
if (position !== undefined) {
|
||||
for (var i = 0; i < position.count; i++) {
|
||||
indices.push(i);
|
||||
}
|
||||
|
||||
geometry.setIndex(indices);
|
||||
index = geometry.getIndex();
|
||||
} else {
|
||||
console.error(
|
||||
'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.'
|
||||
);
|
||||
return geometry;
|
||||
}
|
||||
}
|
||||
|
||||
//
|
||||
|
||||
var numberOfTriangles = index.count - 2;
|
||||
var newIndices = [];
|
||||
|
||||
if (drawMode === TriangleFanDrawMode) {
|
||||
// gl.TRIANGLE_FAN
|
||||
|
||||
for (var i = 1; i <= numberOfTriangles; i++) {
|
||||
newIndices.push(index.getX(0));
|
||||
newIndices.push(index.getX(i));
|
||||
newIndices.push(index.getX(i + 1));
|
||||
}
|
||||
} else {
|
||||
// gl.TRIANGLE_STRIP
|
||||
|
||||
for (var i = 0; i < numberOfTriangles; i++) {
|
||||
if (i % 2 === 0) {
|
||||
newIndices.push(index.getX(i));
|
||||
newIndices.push(index.getX(i + 1));
|
||||
newIndices.push(index.getX(i + 2));
|
||||
} else {
|
||||
newIndices.push(index.getX(i + 2));
|
||||
newIndices.push(index.getX(i + 1));
|
||||
newIndices.push(index.getX(i));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (newIndices.length / 3 !== numberOfTriangles) {
|
||||
console.error(
|
||||
'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unable to generate correct amount of triangles.'
|
||||
);
|
||||
}
|
||||
|
||||
// build final geometry
|
||||
|
||||
var newGeometry = geometry.clone();
|
||||
newGeometry.setIndex(newIndices);
|
||||
newGeometry.clearGroups();
|
||||
|
||||
return newGeometry;
|
||||
}
|
||||
|
||||
console.error('THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unknown draw mode:', drawMode);
|
||||
return geometry;
|
||||
},
|
||||
};
|
||||
|
||||
export { BufferGeometryUtils };
|
||||
Loading…
Reference in New Issue