63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
function parseObj(docStr) {
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const bufPositions = [];
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const bufNormals = [];
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const out = [];
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var vertCount = 0;
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const ops = {
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v(str) {
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var xyz = str.match(/[0-9.-]+/g).map(Number);
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bufPositions.push(xyz);
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},
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vn(str) {
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var xyz = str.match(/[0-9.-]+/g).map(Number);
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bufNormals.push(xyz);
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},
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f(str) {
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const pts = [];
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for (var faceStr of str.split(" ")) {
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var [iV, iVt, iVn] = faceStr.split("/").map(Number);
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/* obj uses 1-based indices */
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iV--; iVt--; iVn--;
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pts.push({
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iV: iV,
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// iVt: iVt,
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iVn: iVn,
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});
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}
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/* triangulate. */
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for (var i = 0; i < pts.length - 2; i++) {
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out.push(
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bufPositions[pts[0].iV],
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bufNormals[pts[0].iVn],
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bufPositions[pts[i + 1].iV],
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bufNormals[pts[i + 1].iVn],
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bufPositions[pts[i + 2].iV],
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bufNormals[pts[i + 2].iVn],
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);
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vertCount += 3;
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}
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}
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};
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for (var line of docStr.split("\n")) { /* if you use crlf that sucks lol */
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if (line == "" || line.startsWith("#")) {
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continue;
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}
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var tks = line.split(" ");
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var op = tks.shift();
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var cont = tks.join(" ");
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var opFunc = ops[op];
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if (opFunc) opFunc(cont);
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}
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return [new Float32Array(out.flat()), vertCount];
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} |