70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
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'use strict';
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import { util } from '../geo/base.js';
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/**
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* @param {String} text
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* @returns {Array} vertex face array
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*/
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export function parseAsync(text) {
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return new Promise((resolve,reject) => {
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resolve(parse(text));
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});
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}
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export function parse(text) {
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let lines = text.replaceAll(/ +/g,' ').split('\n').map(l => l.trim());
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let verts = [];
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let faces = [];
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let objs = [ faces ];
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// Polyfill for appendAll if not present
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if (!Array.prototype.appendAll) {
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Object.defineProperty(Array.prototype, 'appendAll', {
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value: function(arr) {
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for (let v of arr) this.push(v);
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},
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enumerable: false
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});
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}
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for (let line of lines) {
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let toks = line.split(' ');
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switch (toks.shift()) {
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case 'v':
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let v = toks.map(v => parseFloat(v)).slice(0,3);
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if (v.length < 3) {
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console.log('??',toks,line);
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}
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verts.push(v);
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break;
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case 'f':
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let tok = toks.map(f => parseInt(f.split('/')[0]));
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if (tok.length > 3) {
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const p = tok.map(t => verts[t-1]).flat();
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const t = util.triangulate(p, [], 3, true);
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const r = t.map(i => tok[i]);
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for (let v of r) {
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faces.appendAll(verts[v - 1]);
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}
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} else {
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// add support for negative indices (offset from last vertex array point)
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faces.appendAll(verts[tok[0]-1]);
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faces.appendAll(verts[tok[1]-1]);
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faces.appendAll(verts[tok[2]-1]);
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}
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break;
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case 'g':
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if (faces.length) {
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objs.push(faces = []);
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}
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if (toks[0]) {
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faces.name = toks.join(' ');
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}
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break;
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}
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}
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return objs;
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}
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