mirror of
https://github.com/CesiumGS/obj2gltf.git
synced 2024-11-27 10:30:16 -05:00
706 lines
27 KiB
JavaScript
706 lines
27 KiB
JavaScript
'use strict';
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var Cesium = require('cesium');
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var path = require('path');
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var Promise = require('bluebird');
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var loadTexture = require('./loadTexture');
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var outsideDirectory = require('./outsideDirectory');
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var readLines = require('./readLines');
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var Texture = require('./Texture');
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var CesiumMath = Cesium.Math;
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var combine = Cesium.combine;
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var defaultValue = Cesium.defaultValue;
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var defined = Cesium.defined;
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module.exports = loadMtl;
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/**
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* Parse a .mtl file and load textures referenced within. Returns an array of glTF materials with Texture
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* objects stored in the texture slots.
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* <p>
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* Packed PBR textures (like metallicRoughnessOcclusion and specularGlossiness) require all input textures to be decoded before hand.
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* If a texture is of an unsupported format like .gif or .tga it can't be packed and a metallicRoughness texture will not be created.
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* Similarly if a texture cannot be found it will be ignored and a default value will be used instead.
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* </p>
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*
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* @param {String} mtlPath Path to the .mtl file.
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* @param {Object} options The options object passed along from lib/obj2gltf.js
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* @param {Boolean} options.hasNormals Whether the model has normals.
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* @returns {Promise} A promise resolving to an array of glTF materials with Texture objects stored in the texture slots.
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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 texturePromiseMap = {}; // Maps texture paths to load promises so that no texture is loaded twice
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var texturePromises = [];
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var overridingTextures = options.overridingTextures;
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var overridingSpecularTexture = defaultValue(overridingTextures.metallicRoughnessOcclusionTexture, overridingTextures.specularGlossinessTexture);
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var overridingSpecularShininessTexture = defaultValue(overridingTextures.metallicRoughnessOcclusionTexture, overridingTextures.specularGlossinessTexture);
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var overridingAmbientTexture = defaultValue(overridingTextures.metallicRoughnessOcclusionTexture, overridingTextures.occlusionTexture);
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var overridingNormalTexture = overridingTextures.normalTexture;
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var overridingDiffuseTexture = overridingTextures.baseColorTexture;
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var overridingEmissiveTexture = overridingTextures.emissiveTexture;
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// Textures that are packed into PBR textures need to be decoded first
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var decodeOptions = options.materialsCommon ? undefined : {
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decode : true
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};
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var diffuseTextureOptions = {
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checkTransparency : options.checkTransparency
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};
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var ambientTextureOptions = defined(overridingAmbientTexture) ? undefined : (options.packOcclusion ? decodeOptions : undefined);
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var specularTextureOptions = defined(overridingSpecularTexture) ? undefined : decodeOptions;
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var specularShinessTextureOptions = defined(overridingSpecularShininessTexture) ? undefined : decodeOptions;
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var emissiveTextureOptions;
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var normalTextureOptions;
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function createMaterial(name) {
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material = new Material();
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material.name = name;
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material.specularShininess = options.metallicRoughness ? 1.0 : 0.0;
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material.specularTexture = overridingSpecularTexture;
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material.specularShininessTexture = overridingSpecularShininessTexture;
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material.diffuseTexture = overridingDiffuseTexture;
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material.ambientTexture = overridingAmbientTexture;
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material.normalTexture = overridingNormalTexture;
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material.emissiveTexture = overridingEmissiveTexture;
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materials.push(material);
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}
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/**
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* Removes texture options from texture name
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* NOTE: assumes no spaces in texture name
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*
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* @param {String} name
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* @returns {String} The clean texture name
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*/
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function cleanTextureName (name) {
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var re = /-(bm|t|s|o|blendu|blendv|boost|mm|texres|clamp|imfchan|type)/;
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if (re.test(name)) {
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return name.split(/\s+/).pop();
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}
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return name;
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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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createMaterial(name);
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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 = correctAlpha(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 = correctAlpha(1.0 - parseFloat(value));
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} else if (/^map_Ka /i.test(line)) {
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if (!defined(overridingAmbientTexture)) {
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material.ambientTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(7).trim()));
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}
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} else if (/^map_Ke /i.test(line)) {
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if (!defined(overridingEmissiveTexture)) {
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material.emissiveTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(7).trim()));
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}
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} else if (/^map_Kd /i.test(line)) {
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if (!defined(overridingDiffuseTexture)) {
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material.diffuseTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(7).trim()));
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}
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} else if (/^map_Ks /i.test(line)) {
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if (!defined(overridingSpecularTexture)) {
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material.specularTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(7).trim()));
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}
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} else if (/^map_Ns /i.test(line)) {
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if (!defined(overridingSpecularShininessTexture)) {
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material.specularShininessTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(7).trim()));
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}
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} else if (/^map_Bump /i.test(line)) {
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if (!defined(overridingNormalTexture)) {
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material.normalTexture = path.resolve(mtlDirectory, cleanTextureName(line.substring(9).trim()));
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}
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}
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}
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function loadMaterialTextures(material) {
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loadMaterialTexture(material, 'diffuseTexture', diffuseTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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loadMaterialTexture(material, 'ambientTexture', ambientTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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loadMaterialTexture(material, 'emissiveTexture', emissiveTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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loadMaterialTexture(material, 'specularTexture', specularTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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loadMaterialTexture(material, 'specularShininessTexture', specularShinessTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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loadMaterialTexture(material, 'normalTexture', normalTextureOptions, mtlDirectory, texturePromiseMap, texturePromises, options);
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}
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return readLines(mtlPath, parseLine)
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.then(function() {
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var length = materials.length;
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for (var i = 0; i < length; ++i) {
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loadMaterialTextures(materials[i]);
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}
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return Promise.all(texturePromises);
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})
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.then(function() {
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return convertMaterials(materials, options);
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});
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}
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function correctAlpha(alpha) {
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// An alpha of 0.0 usually implies a problem in the export, change to 1.0 instead
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return alpha === 0.0 ? 1.0 : alpha;
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}
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function Material() {
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this.name = undefined;
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this.ambientColor = [0.0, 0.0, 0.0, 1.0]; // Ka
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this.emissiveColor = [0.0, 0.0, 0.0, 1.0]; // Ke
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this.diffuseColor = [0.5, 0.5, 0.5, 1.0]; // Kd
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this.specularColor = [0.0, 0.0, 0.0, 1.0]; // Ks
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this.specularShininess = 0.0; // Ns
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this.alpha = 1.0; // d / Tr
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this.ambientTexture = undefined; // map_Ka
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this.emissiveTexture = undefined; // map_Ke
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this.diffuseTexture = undefined; // map_Kd
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this.specularTexture = undefined; // map_Ks
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this.specularShininessTexture = undefined; // map_Ns
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this.normalTexture = undefined; // map_Bump
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}
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loadMtl.getDefaultMaterial = function(options) {
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return convertMaterial(new Material(), options);
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};
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// Exposed for testing
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loadMtl._createMaterial = function(materialOptions, options) {
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return convertMaterial(combine(materialOptions, new Material()), options);
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};
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function loadMaterialTexture(material, name, textureOptions, mtlDirectory, texturePromiseMap, texturePromises, options) {
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var texturePath = material[name];
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if (!defined(texturePath)) {
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return;
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}
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var texturePromise = texturePromiseMap[texturePath];
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if (!defined(texturePromise)) {
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var shallowPath = path.resolve(path.join(mtlDirectory, path.basename(texturePath)));
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if (options.secure && outsideDirectory(texturePath, mtlDirectory)) {
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// Try looking for the texture in the same directory as the obj
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options.logger('Texture file is outside of the mtl directory and the secure flag is true. Attempting to read the texture file from within the obj directory instead.');
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texturePromise = loadTexture(shallowPath, textureOptions)
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.catch(function(error) {
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options.logger(error.message);
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options.logger('Could not read texture file at ' + shallowPath + '. This texture will be ignored');
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});
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} else {
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texturePromise = loadTexture(texturePath, textureOptions)
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.catch(function(error) {
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// Try looking for the texture in the same directory as the obj
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options.logger(error.message);
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options.logger('Could not read texture file at ' + texturePath + '. Attempting to read the texture file from within the obj directory instead.');
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return loadTexture(shallowPath, textureOptions);
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})
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.catch(function(error) {
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options.logger(error.message);
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options.logger('Could not read texture file at ' + shallowPath + '. This texture will be ignored.');
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});
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}
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texturePromiseMap[texturePath] = texturePromise;
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}
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texturePromises.push(texturePromise
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.then(function(texture) {
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material[name] = texture;
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}));
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}
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function convertMaterial(material, options) {
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if (options.specularGlossiness) {
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return createSpecularGlossinessMaterial(material, options);
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} else if (options.metallicRoughness) {
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return createMetallicRoughnessMaterial(material, options);
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} else if (options.materialsCommon) {
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return createMaterialsCommonMaterial(material, options);
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}
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// No material type specified, convert the material to metallic roughness
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convertTraditionalToMetallicRoughness(material);
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return createMetallicRoughnessMaterial(material, options);
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}
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function convertMaterials(materials, options) {
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return materials.map(function(material) {
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return convertMaterial(material, options);
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});
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}
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function resizeChannel(sourcePixels, sourceWidth, sourceHeight, targetPixels, targetWidth, targetHeight) {
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// Nearest neighbor sampling
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var widthRatio = sourceWidth / targetWidth;
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var heightRatio = sourceHeight / targetHeight;
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for (var y = 0; y < targetHeight; ++y) {
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for (var x = 0; x < targetWidth; ++x) {
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var targetIndex = y * targetWidth + x;
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var sourceY = Math.round(y * heightRatio);
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var sourceX = Math.round(x * widthRatio);
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var sourceIndex = sourceY * sourceWidth + sourceX;
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var sourceValue = sourcePixels.readUInt8(sourceIndex);
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targetPixels.writeUInt8(sourceValue, targetIndex);
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}
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}
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return targetPixels;
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}
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var scratchResizeChannel;
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function getTextureChannel(texture, index, targetWidth, targetHeight, targetChannel) {
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var pixels = texture.pixels; // RGBA
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var sourceWidth = texture.width;
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var sourceHeight = texture.height;
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var sourcePixelsLength = sourceWidth * sourceHeight;
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var targetPixelsLength = targetWidth * targetHeight;
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// Allocate the scratchResizeChannel on demand if the texture needs to be resized
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var sourceChannel = targetChannel;
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if (sourcePixelsLength > targetPixelsLength) {
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if (!defined(scratchResizeChannel) || (sourcePixelsLength > scratchResizeChannel.length)) {
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scratchResizeChannel = Buffer.alloc(sourcePixelsLength);
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}
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sourceChannel = scratchResizeChannel;
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}
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for (var i = 0; i < sourcePixelsLength; ++i) {
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var value = pixels.readUInt8(i * 4 + index);
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sourceChannel.writeUInt8(value, i);
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}
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if (sourcePixelsLength > targetPixelsLength) {
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resizeChannel(sourceChannel, sourceWidth, sourceHeight, targetChannel, targetWidth, targetHeight);
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}
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return targetChannel;
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}
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function writeChannel(pixels, channel, index) {
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var pixelsLength = pixels.length / 4;
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for (var i = 0; i < pixelsLength; ++i) {
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var value = channel.readUInt8(i);
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pixels.writeUInt8(value, i * 4 + index);
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}
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}
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function getMinimumDimensions(textures, options) {
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var i;
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var texture;
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var width = Number.POSITIVE_INFINITY;
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var height = Number.POSITIVE_INFINITY;
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var length = textures.length;
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for (i = 0; i < length; ++i) {
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texture = textures[i];
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width = Math.min(texture.width, width);
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height = Math.min(texture.height, height);
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}
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for (i = 0; i < length; ++i) {
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texture = textures[i];
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if (texture.width !== width || texture.height !== height) {
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options.logger('Texture ' + texture.path + ' will be scaled from ' + texture.width + 'x' + texture.height + ' to ' + width + 'x' + height + '.');
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}
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}
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return [width, height];
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}
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function createMetallicRoughnessTexture(metallicTexture, roughnessTexture, occlusionTexture, options) {
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if (defined(options.overridingTextures.metallicRoughnessOcclusionTexture)) {
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return metallicTexture;
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}
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var packMetallic = defined(metallicTexture);
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var packRoughness = defined(roughnessTexture);
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var packOcclusion = defined(occlusionTexture) && options.packOcclusion;
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if (!packMetallic && !packRoughness) {
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return undefined;
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}
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if (packMetallic && !defined(metallicTexture.pixels)) {
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options.logger('Could not get decoded texture data for ' + metallicTexture.path + '. The material will be created without a metallicRoughness texture.');
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return undefined;
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}
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if (packRoughness && !defined(roughnessTexture.pixels)) {
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options.logger('Could not get decoded texture data for ' + roughnessTexture.path + '. The material will be created without a metallicRoughness texture.');
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return undefined;
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}
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if (packOcclusion && !defined(occlusionTexture.pixels)) {
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options.logger('Could not get decoded texture data for ' + occlusionTexture.path + '. The occlusion texture will not be packed in the metallicRoughness texture.');
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return undefined;
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}
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var packedTextures = [metallicTexture, roughnessTexture, occlusionTexture].filter(function(texture) {
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return defined(texture) && defined(texture.pixels);
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});
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var dimensions = getMinimumDimensions(packedTextures, options);
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var width = dimensions[0];
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var height = dimensions[1];
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var pixelsLength = width * height;
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var pixels = Buffer.alloc(pixelsLength * 4, 0xFF); // Initialize with 4 channels, unused channels will be white
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var scratchChannel = Buffer.alloc(pixelsLength);
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if (packMetallic) {
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// Write into the B channel
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var metallicChannel = getTextureChannel(metallicTexture, 0, width, height, scratchChannel);
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writeChannel(pixels, metallicChannel, 2);
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}
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if (packRoughness) {
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// Write into the G channel
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var roughnessChannel = getTextureChannel(roughnessTexture, 0, width, height, scratchChannel);
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writeChannel(pixels, roughnessChannel, 1);
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}
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if (packOcclusion) {
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// Write into the R channel
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var occlusionChannel = getTextureChannel(occlusionTexture, 0, width, height, scratchChannel);
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writeChannel(pixels, occlusionChannel, 0);
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}
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var length = packedTextures.length;
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var names = new Array(length);
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for (var i = 0; i < length; ++i) {
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names[i] = packedTextures[i].name;
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}
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var name = names.join('_');
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var texture = new Texture();
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texture.name = name;
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texture.extension = '.png';
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texture.pixels = pixels;
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texture.width = width;
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texture.height = height;
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return texture;
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}
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function createSpecularGlossinessTexture(specularTexture, glossinessTexture, options) {
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if (defined(options.overridingTextures.specularGlossinessTexture)) {
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return specularTexture;
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}
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var packSpecular = defined(specularTexture);
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var packGlossiness = defined(glossinessTexture);
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if (!packSpecular && !packGlossiness) {
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return undefined;
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}
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if (packSpecular && !defined(specularTexture.pixels)) {
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options.logger('Could not get decoded texture data for ' + specularTexture.path + '. The material will be created without a specularGlossiness texture.');
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return undefined;
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}
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if (packGlossiness && !defined(glossinessTexture.pixels)) {
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options.logger('Could not get decoded texture data for ' + glossinessTexture.path + '. The material will be created without a specularGlossiness texture.');
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return undefined;
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}
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var packedTextures = [specularTexture, glossinessTexture].filter(function(texture) {
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return defined(texture) && defined(texture.pixels);
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});
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var dimensions = getMinimumDimensions(packedTextures, options);
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var width = dimensions[0];
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var height = dimensions[1];
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var pixelsLength = width * height;
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var pixels = Buffer.alloc(pixelsLength * 4, 0xFF); // Initialize with 4 channels, unused channels will be white
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var scratchChannel = Buffer.alloc(pixelsLength);
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if (packSpecular) {
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// Write into the R, G, B channels
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var redChannel = getTextureChannel(specularTexture, 0, width, height, scratchChannel);
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writeChannel(pixels, redChannel, 0);
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var greenChannel = getTextureChannel(specularTexture, 1, width, height, scratchChannel);
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writeChannel(pixels, greenChannel, 1);
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var blueChannel = getTextureChannel(specularTexture, 2, width, height, scratchChannel);
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writeChannel(pixels, blueChannel, 2);
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|
}
|
|
|
|
if (packGlossiness) {
|
|
// Write into the A channel
|
|
var glossinessChannel = getTextureChannel(glossinessTexture, 0, width, height, scratchChannel);
|
|
writeChannel(pixels, glossinessChannel, 3);
|
|
}
|
|
|
|
var length = packedTextures.length;
|
|
var names = new Array(length);
|
|
for (var i = 0; i < length; ++i) {
|
|
names[i] = packedTextures[i].name;
|
|
}
|
|
var name = names.join('_');
|
|
|
|
var texture = new Texture();
|
|
texture.name = name;
|
|
texture.extension = '.png';
|
|
texture.pixels = pixels;
|
|
texture.width = width;
|
|
texture.height = height;
|
|
|
|
return texture;
|
|
}
|
|
|
|
function createSpecularGlossinessMaterial(material, options) {
|
|
var emissiveTexture = material.emissiveTexture;
|
|
var normalTexture = material.normalTexture;
|
|
var occlusionTexture = material.ambientTexture;
|
|
var diffuseTexture = material.diffuseTexture;
|
|
var specularTexture = material.specularTexture;
|
|
var glossinessTexture = material.specularShininessTexture;
|
|
var specularGlossinessTexture = createSpecularGlossinessTexture(specularTexture, glossinessTexture, options);
|
|
|
|
var emissiveFactor = material.emissiveColor.slice(0, 3);
|
|
var diffuseFactor = material.diffuseColor;
|
|
var specularFactor = material.specularColor.slice(0, 3);
|
|
var glossinessFactor = material.specularShininess;
|
|
|
|
if (defined(emissiveTexture)) {
|
|
emissiveFactor = [1.0, 1.0, 1.0];
|
|
}
|
|
|
|
if (defined(diffuseTexture)) {
|
|
diffuseFactor = [1.0, 1.0, 1.0, 1.0];
|
|
}
|
|
|
|
if (defined(specularTexture)) {
|
|
specularFactor = [1.0, 1.0, 1.0];
|
|
}
|
|
|
|
if (defined(glossinessTexture)) {
|
|
glossinessFactor = 1.0;
|
|
}
|
|
|
|
var alpha = material.alpha;
|
|
diffuseFactor[3] = alpha;
|
|
|
|
var transparent = alpha < 1.0;
|
|
if (defined(diffuseTexture)) {
|
|
transparent = transparent || diffuseTexture.transparent;
|
|
}
|
|
|
|
var doubleSided = transparent;
|
|
var alphaMode = transparent ? 'BLEND' : 'OPAQUE';
|
|
|
|
return {
|
|
name : material.name,
|
|
extensions : {
|
|
KHR_materials_pbrSpecularGlossiness: {
|
|
diffuseTexture : diffuseTexture,
|
|
specularGlossinessTexture : specularGlossinessTexture,
|
|
diffuseFactor : diffuseFactor,
|
|
specularFactor : specularFactor,
|
|
glossinessFactor : glossinessFactor
|
|
}
|
|
},
|
|
emissiveTexture : emissiveTexture,
|
|
normalTexture : normalTexture,
|
|
occlusionTexture : occlusionTexture,
|
|
emissiveFactor : emissiveFactor,
|
|
alphaMode : alphaMode,
|
|
doubleSided : doubleSided
|
|
};
|
|
}
|
|
|
|
function createMetallicRoughnessMaterial(material, options) {
|
|
var emissiveTexture = material.emissiveTexture;
|
|
var normalTexture = material.normalTexture;
|
|
var occlusionTexture = material.ambientTexture;
|
|
var baseColorTexture = material.diffuseTexture;
|
|
var metallicTexture = material.specularTexture;
|
|
var roughnessTexture = material.specularShininessTexture;
|
|
var metallicRoughnessTexture = createMetallicRoughnessTexture(metallicTexture, roughnessTexture, occlusionTexture, options);
|
|
|
|
if (options.packOcclusion) {
|
|
occlusionTexture = metallicRoughnessTexture;
|
|
}
|
|
|
|
var emissiveFactor = material.emissiveColor.slice(0, 3);
|
|
var baseColorFactor = material.diffuseColor;
|
|
var metallicFactor = material.specularColor[0];
|
|
var roughnessFactor = material.specularShininess;
|
|
|
|
if (defined(emissiveTexture)) {
|
|
emissiveFactor = [1.0, 1.0, 1.0];
|
|
}
|
|
|
|
if (defined(baseColorTexture)) {
|
|
baseColorFactor = [1.0, 1.0, 1.0, 1.0];
|
|
}
|
|
|
|
if (defined(metallicTexture)) {
|
|
metallicFactor = 1.0;
|
|
}
|
|
|
|
if (defined(roughnessTexture)) {
|
|
roughnessFactor = 1.0;
|
|
}
|
|
|
|
var alpha = material.alpha;
|
|
baseColorFactor[3] = alpha;
|
|
|
|
var transparent = alpha < 1.0;
|
|
if (defined(baseColorTexture)) {
|
|
transparent = transparent || baseColorTexture.transparent;
|
|
}
|
|
|
|
var doubleSided = transparent;
|
|
var alphaMode = transparent ? 'BLEND' : 'OPAQUE';
|
|
|
|
return {
|
|
name : material.name,
|
|
pbrMetallicRoughness : {
|
|
baseColorTexture : baseColorTexture,
|
|
metallicRoughnessTexture : metallicRoughnessTexture,
|
|
baseColorFactor : baseColorFactor,
|
|
metallicFactor : metallicFactor,
|
|
roughnessFactor : roughnessFactor
|
|
},
|
|
emissiveTexture : emissiveTexture,
|
|
normalTexture : normalTexture,
|
|
occlusionTexture : occlusionTexture,
|
|
emissiveFactor : emissiveFactor,
|
|
alphaMode : alphaMode,
|
|
doubleSided : doubleSided
|
|
};
|
|
}
|
|
|
|
function luminance(color) {
|
|
return color[0] * 0.2125 + color[1] * 0.7154 + color[2] * 0.0721;
|
|
}
|
|
|
|
function convertTraditionalToMetallicRoughness(material) {
|
|
// Translate the blinn-phong model to the pbr metallic-roughness model
|
|
// Roughness factor is a combination of specular intensity and shininess
|
|
// Metallic factor is 0.0
|
|
// Textures are not converted for now
|
|
var specularIntensity = luminance(material.specularColor);
|
|
|
|
// Transform from 0-1000 range to 0-1 range. Then invert.
|
|
var roughnessFactor = material.specularShininess;
|
|
roughnessFactor = roughnessFactor / 1000.0;
|
|
roughnessFactor = 1.0 - roughnessFactor;
|
|
roughnessFactor = CesiumMath.clamp(roughnessFactor, 0.0, 1.0);
|
|
|
|
// Low specular intensity values should produce a rough material even if shininess is high.
|
|
if (specularIntensity < 0.1) {
|
|
roughnessFactor *= (1.0 - specularIntensity);
|
|
}
|
|
|
|
var metallicFactor = 0.0;
|
|
|
|
material.specularColor = [metallicFactor, metallicFactor, metallicFactor, 1.0];
|
|
material.specularShininess = roughnessFactor;
|
|
}
|
|
|
|
function createMaterialsCommonMaterial(material, options) {
|
|
var ambient = defaultValue(material.ambientTexture, material.ambientColor);
|
|
var diffuse = defaultValue(material.diffuseTexture, material.diffuseColor);
|
|
var emission = defaultValue(material.emissiveTexture, material.emissiveColor);
|
|
var specular = defaultValue(material.specularTexture, material.specularColor);
|
|
|
|
var alpha = material.alpha;
|
|
var shininess = material.specularShininess;
|
|
var hasSpecular = (shininess > 0.0) && (defined(material.specularTexture) || (specular[0] > 0.0 || specular[1] > 0.0 || specular[2] > 0.0));
|
|
|
|
var transparent;
|
|
var transparency = 1.0;
|
|
if (defined(material.diffuseTexture)) {
|
|
transparency = alpha;
|
|
transparent = material.diffuseTexture.transparent || (transparency < 1.0);
|
|
} else {
|
|
diffuse[3] = alpha;
|
|
transparent = alpha < 1.0;
|
|
}
|
|
|
|
if (!defined(material.ambientTexture)) {
|
|
// If ambient color is [1, 1, 1] assume it is a multiplier and instead change to [0, 0, 0]
|
|
if (ambient[0] === 1.0 && ambient[1] === 1.0 && ambient[2] === 1.0) {
|
|
ambient = [0.0, 0.0, 0.0, 1.0];
|
|
}
|
|
}
|
|
|
|
var doubleSided = transparent;
|
|
var technique = hasSpecular ? 'PHONG' : 'LAMBERT';
|
|
|
|
if (!options.hasNormals) {
|
|
// Constant technique only factors in ambient and emission sources - set emission to diffuse
|
|
emission = diffuse;
|
|
technique = 'CONSTANT';
|
|
}
|
|
|
|
return {
|
|
name : material.name,
|
|
extensions : {
|
|
KHR_materials_common : {
|
|
technique : technique,
|
|
transparent : transparent,
|
|
doubleSided : doubleSided,
|
|
values : {
|
|
ambient : ambient,
|
|
diffuse : diffuse,
|
|
emission : emission,
|
|
specular : specular,
|
|
shininess : shininess,
|
|
transparency : transparency,
|
|
transparent : transparent,
|
|
doubleSided : doubleSided
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|