import {
Color,
ColorManagement,
DefaultLoadingManager,
FileLoader,
FrontSide,
Loader,
LoaderUtils,
MeshPhongMaterial,
RepeatWrapping,
TextureLoader,
Vector2,
SRGBColorSpace
} from 'three';
/**
* A loader for the MTL format.
*
* The Material Template Library format (MTL) or .MTL File Format is a companion file format
* to OBJ that describes surface shading (material) properties of objects within one or more
* OBJ files.
*
* ```js
* const loader = new MTLLoader();
* const materials = await loader.loadAsync( 'models/obj/male02/male02.mtl' );
*
* const objLoader = new OBJLoader();
* objLoader.setMaterials( materials );
* ```
*
* @augments Loader
* @three_import import { MTLLoader } from 'three/addons/loaders/MTLLoader.js';
*/
class MTLLoader extends Loader {
constructor( manager ) {
super( manager );
}
/**
* Starts loading from the given URL and passes the loaded MTL asset
* to the `onLoad()` callback.
*
* @param {string} url - The path/URL of the file to be loaded. This can also be a data URI.
* @param {function(MaterialCreator)} onLoad - Executed when the loading process has been finished.
* @param {onProgressCallback} onProgress - Executed while the loading is in progress.
* @param {onErrorCallback} onError - Executed when errors occur.
*/
load( url, onLoad, onProgress, onError ) {
const scope = this;
const path = ( this.path === '' ) ? LoaderUtils.extractUrlBase( url ) : this.path;
const loader = new FileLoader( this.manager );
loader.setPath( this.path );
loader.setRequestHeader( this.requestHeader );
loader.setWithCredentials( this.withCredentials );
loader.load( url, function ( text ) {
try {
onLoad( scope.parse( text, path ) );
} catch ( e ) {
if ( onError ) {
onError( e );
} else {
console.error( e );
}
scope.manager.itemError( url );
}
}, onProgress, onError );
}
/**
* Sets the material options.
*
* @param {MTLLoader~MaterialOptions} value - The material options.
* @return {MTLLoader} A reference to this loader.
*/
setMaterialOptions( value ) {
this.materialOptions = value;
return this;
}
/**
* Parses the given MTL data and returns the resulting material creator.
*
* @param {string} text - The raw MTL data as a string.
* @param {string} path - The URL base path.
* @return {MaterialCreator} The material creator.
*/
parse( text, path ) {
const lines = text.split( '\n' );
let info = {};
const delimiter_pattern = /\s+/;
const materialsInfo = {};
for ( let i = 0; i < lines.length; i ++ ) {
let line = lines[ i ];
line = line.trim();
if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
// Blank line or comment ignore
continue;
}
const pos = line.indexOf( ' ' );
let key = ( pos >= 0 ) ? line.substring( 0, pos ) : line;
key = key.toLowerCase();
let value = ( pos >= 0 ) ? line.substring( pos + 1 ) : '';
value = value.trim();
if ( key === 'newmtl' ) {
// New material
info = { name: value };
materialsInfo[ value ] = info;
} else {
if ( key === 'ka' || key === 'kd' || key === 'ks' || key === 'ke' ) {
const ss = value.split( delimiter_pattern, 3 );
info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];
} else {
info[ key ] = value;
}
}
}
const materialCreator = new MaterialCreator( this.resourcePath || path, this.materialOptions );
materialCreator.setCrossOrigin( this.crossOrigin );
materialCreator.setManager( this.manager );
materialCreator.setMaterials( materialsInfo );
return materialCreator;
}
}
/**
* Material options of `MTLLoader`.
*
* @typedef {Object} MTLLoader~MaterialOptions
* @property {(FrontSide|BackSide|DoubleSide)} [side=FrontSide] - Which side to apply the material.
* @property {(RepeatWrapping|ClampToEdgeWrapping|MirroredRepeatWrapping)} [wrap=RepeatWrapping] - What type of wrapping to apply for textures.
* @property {boolean} [normalizeRGB=false] - Whether RGB colors should be normalized to `0-1` from `0-255`.
* @property {boolean} [ignoreZeroRGBs=false] - Ignore values of RGBs (Ka,Kd,Ks) that are all 0's.
*/
class MaterialCreator {
constructor( baseUrl = '', options = {} ) {
this.baseUrl = baseUrl;
this.options = options;
this.materialsInfo = {};
this.materials = {};
this.materialsArray = [];
this.nameLookup = {};
this.crossOrigin = 'anonymous';
this.side = ( this.options.side !== undefined ) ? this.options.side : FrontSide;
this.wrap = ( this.options.wrap !== undefined ) ? this.options.wrap : RepeatWrapping;
}
setCrossOrigin( value ) {
this.crossOrigin = value;
return this;
}
setManager( value ) {
this.manager = value;
}
setMaterials( materialsInfo ) {
this.materialsInfo = this.convert( materialsInfo );
this.materials = {};
this.materialsArray = [];
this.nameLookup = {};
}
convert( materialsInfo ) {
if ( ! this.options ) return materialsInfo;
const converted = {};
for ( const mn in materialsInfo ) {
// Convert materials info into normalized form based on options
const mat = materialsInfo[ mn ];
const covmat = {};
converted[ mn ] = covmat;
for ( const prop in mat ) {
let save = true;
let value = mat[ prop ];
const lprop = prop.toLowerCase();
switch ( lprop ) {
case 'kd':
case 'ka':
case 'ks':
// Diffuse color (color under white light) using RGB values
if ( this.options && this.options.normalizeRGB ) {
value = [ value[ 0 ] / 255, value[ 1 ] / 255, value[ 2 ] / 255 ];
}
if ( this.options && this.options.ignoreZeroRGBs ) {
if ( value[ 0 ] === 0 && value[ 1 ] === 0 && value[ 2 ] === 0 ) {
// ignore
save = false;
}
}
break;
default:
break;
}
if ( save ) {
covmat[ lprop ] = value;
}
}
}
return converted;
}
preload() {
for ( const mn in this.materialsInfo ) {
this.create( mn );
}
}
getIndex( materialName ) {
return this.nameLookup[ materialName ];
}
getAsArray() {
let index = 0;
for ( const mn in this.materialsInfo ) {
this.materialsArray[ index ] = this.create( mn );
this.nameLookup[ mn ] = index;
index ++;
}
return this.materialsArray;
}
create( materialName ) {
if ( this.materials[ materialName ] === undefined ) {
this.createMaterial_( materialName );
}
return this.materials[ materialName ];
}
createMaterial_( materialName ) {
// Create material
const scope = this;
const mat = this.materialsInfo[ materialName ];
const params = {
name: materialName,
side: this.side
};
function resolveURL( baseUrl, url ) {
if ( typeof url !== 'string' || url === '' )
return '';
// Absolute URL
if ( /^https?:\/\//i.test( url ) ) return url;
return baseUrl + url;
}
function setMapForType( mapType, value ) {
if ( params[ mapType ] ) return; // Keep the first encountered texture
const texParams = scope.getTextureParams( value, params );
const map = scope.loadTexture( resolveURL( scope.baseUrl, texParams.url ) );
map.repeat.copy( texParams.scale );
map.offset.copy( texParams.offset );
map.wrapS = scope.wrap;
map.wrapT = scope.wrap;
if ( mapType === 'map' || mapType === 'emissiveMap' ) {
map.colorSpace = SRGBColorSpace;
}
params[ mapType ] = map;
}
for ( const prop in mat ) {
const value = mat[ prop ];
let n;
if ( value === '' ) continue;
switch ( prop.toLowerCase() ) {
// Ns is material specular exponent
case 'kd':
// Diffuse color (color under white light) using RGB values
params.color = ColorManagement.toWorkingColorSpace( new Color().fromArray( value ), SRGBColorSpace );
break;
case 'ks':
// Specular color (color when light is reflected from shiny surface) using RGB values
params.specular = ColorManagement.toWorkingColorSpace( new Color().fromArray( value ), SRGBColorSpace );
break;
case 'ke':
// Emissive using RGB values
params.emissive = ColorManagement.toWorkingColorSpace( new Color().fromArray( value ), SRGBColorSpace );
break;
case 'map_kd':
// Diffuse texture map
setMapForType( 'map', value );
break;
case 'map_ks':
// Specular map
setMapForType( 'specularMap', value );
break;
case 'map_ke':
// Emissive map
setMapForType( 'emissiveMap', value );
break;
case 'norm':
setMapForType( 'normalMap', value );
break;
case 'map_bump':
case 'bump':
// Bump texture map
setMapForType( 'bumpMap', value );
break;
case 'disp':
// Displacement texture map
setMapForType( 'displacementMap', value );
break;
case 'map_d':
// Alpha map
setMapForType( 'alphaMap', value );
params.transparent = true;
break;
case 'ns':
// The specular exponent (defines the focus of the specular highlight)
// A high exponent results in a tight, concentrated highlight. Ns values normally range from 0 to 1000.
params.shininess = parseFloat( value );
break;
case 'd':
n = parseFloat( value );
if ( n < 1 ) {
params.opacity = n;
params.transparent = true;
}
break;
case 'tr':
n = parseFloat( value );
if ( this.options && this.options.invertTrProperty ) n = 1 - n;
if ( n > 0 ) {
params.opacity = 1 - n;
params.transparent = true;
}
break;
default:
break;
}
}
this.materials[ materialName ] = new MeshPhongMaterial( params );
return this.materials[ materialName ];
}
getTextureParams( value, matParams ) {
const texParams = {
scale: new Vector2( 1, 1 ),
offset: new Vector2( 0, 0 )
};
const items = value.split( /\s+/ );
let pos;
pos = items.indexOf( '-bm' );
if ( pos >= 0 ) {
matParams.bumpScale = parseFloat( items[ pos + 1 ] );
items.splice( pos, 2 );
}
pos = items.indexOf( '-mm' );
if ( pos >= 0 ) {
matParams.displacementBias = parseFloat( items[ pos + 1 ] );
matParams.displacementScale = parseFloat( items[ pos + 2 ] );
items.splice( pos, 3 );
}
pos = items.indexOf( '-s' );
if ( pos >= 0 ) {
texParams.scale.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
items.splice( pos, 4 ); // we expect 3 parameters here!
}
pos = items.indexOf( '-o' );
if ( pos >= 0 ) {
texParams.offset.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
items.splice( pos, 4 ); // we expect 3 parameters here!
}
texParams.url = items.join( ' ' ).trim();
return texParams;
}
loadTexture( url, mapping, onLoad, onProgress, onError ) {
const manager = ( this.manager !== undefined ) ? this.manager : DefaultLoadingManager;
let loader = manager.getHandler( url );
if ( loader === null ) {
loader = new TextureLoader( manager );
}
if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin );
const texture = loader.load( url, onLoad, onProgress, onError );
if ( mapping !== undefined ) texture.mapping = mapping;
return texture;
}
}
export { MTLLoader };