mirror of https://github.com/CesiumGS/obj2gltf.git
101 lines
3.8 KiB
JavaScript
101 lines
3.8 KiB
JavaScript
'use strict';
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var path = require('path');
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var Material = require('./Material');
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var readLines = require('./readLines');
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module.exports = loadMtl;
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/**
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* Parse an mtl file.
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*
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* @param {String} mtlPath Path to the mtl file.
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* @param {Object} options An object with the following properties:
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* @param {Boolean} options.metallicRoughness The values in the mtl file are already metallic-roughness PBR values and no conversion step should be applied. Metallic is stored in the Ks and map_Ks slots and roughness is stored in the Ns and map_Ns slots.
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* @returns {Promise} A promise resolving to an array of materials.
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*
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* @private
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*/
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function loadMtl(mtlPath, options) {
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var material;
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var values;
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var value;
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var mtlDirectory = path.dirname(mtlPath);
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var materials = [];
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var defaultSpecularShininess = 0.0;
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if (options.metallicRoughness) {
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defaultSpecularShininess = 1.0; // Fully rough
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}
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function parseLine(line) {
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line = line.trim();
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if (/^newmtl /i.test(line)) {
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var name = line.substring(7).trim();
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material = new Material();
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material.name = name;
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material.specularShininess = defaultSpecularShininess;
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materials.push(material);
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} else if (/^Ka /i.test(line)) {
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values = line.substring(3).trim().split(' ');
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material.ambientColor = [
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parseFloat(values[0]),
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parseFloat(values[1]),
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parseFloat(values[2]),
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1.0
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];
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} else if (/^Ke /i.test(line)) {
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values = line.substring(3).trim().split(' ');
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material.emissiveColor = [
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parseFloat(values[0]),
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parseFloat(values[1]),
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parseFloat(values[2]),
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1.0
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];
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} else if (/^Kd /i.test(line)) {
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values = line.substring(3).trim().split(' ');
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material.diffuseColor = [
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parseFloat(values[0]),
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parseFloat(values[1]),
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parseFloat(values[2]),
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1.0
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];
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} else if (/^Ks /i.test(line)) {
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values = line.substring(3).trim().split(' ');
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material.specularColor = [
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parseFloat(values[0]),
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parseFloat(values[1]),
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parseFloat(values[2]),
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1.0
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];
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} else if (/^Ns /i.test(line)) {
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value = line.substring(3).trim();
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material.specularShininess = parseFloat(value);
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} else if (/^d /i.test(line)) {
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value = line.substring(2).trim();
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material.alpha = parseFloat(value);
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} else if (/^Tr /i.test(line)) {
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value = line.substring(3).trim();
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material.alpha = 1.0 - parseFloat(value);
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} else if (/^map_Ka /i.test(line)) {
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material.ambientTexture = path.resolve(mtlDirectory, line.substring(7).trim());
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} else if (/^map_Ke /i.test(line)) {
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material.emissiveTexture = path.resolve(mtlDirectory, line.substring(7).trim());
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} else if (/^map_Kd /i.test(line)) {
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material.diffuseTexture = path.resolve(mtlDirectory, line.substring(7).trim());
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} else if (/^map_Ks /i.test(line)) {
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material.specularTexture = path.resolve(mtlDirectory, line.substring(7).trim());
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} else if (/^map_Ns /i.test(line)) {
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material.specularShininessTexture = path.resolve(mtlDirectory, line.substring(7).trim());
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} else if (/^map_Bump /i.test(line)) {
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material.normalTexture = path.resolve(mtlDirectory, line.substring(9).trim());
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} else if (/^map_d /i.test(line)) {
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material.alphaTexture = path.resolve(mtlDirectory, line.substring(6).trim());
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}
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}
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return readLines(mtlPath, parseLine)
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.then(function() {
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return materials;
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});
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}
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