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GLTFExporter.js
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/**
* @author fernandojsg / http://fernandojsg.com
* @author Don McCurdy / https://www.donmccurdy.com
* @author Takahiro / https://github.com/takahirox
*/
import {
BufferAttribute,
BufferGeometry,
ClampToEdgeWrapping,
DoubleSide,
InterpolateDiscrete,
InterpolateLinear,
LinearFilter,
LinearMipmapLinearFilter,
LinearMipmapNearestFilter,
MathUtils,
MirroredRepeatWrapping,
NearestFilter,
NearestMipmapLinearFilter,
NearestMipmapNearestFilter,
PropertyBinding,
RGBAFormat,
RepeatWrapping,
Scene,
Vector3
} from "../../three.module.js";
//------------------------------------------------------------------------------
// Constants
//------------------------------------------------------------------------------
var WEBGL_CONSTANTS = {
POINTS: 0x0000,
LINES: 0x0001,
LINE_LOOP: 0x0002,
LINE_STRIP: 0x0003,
TRIANGLES: 0x0004,
TRIANGLE_STRIP: 0x0005,
TRIANGLE_FAN: 0x0006,
UNSIGNED_BYTE: 0x1401,
UNSIGNED_SHORT: 0x1403,
FLOAT: 0x1406,
UNSIGNED_INT: 0x1405,
ARRAY_BUFFER: 0x8892,
ELEMENT_ARRAY_BUFFER: 0x8893,
NEAREST: 0x2600,
LINEAR: 0x2601,
NEAREST_MIPMAP_NEAREST: 0x2700,
LINEAR_MIPMAP_NEAREST: 0x2701,
NEAREST_MIPMAP_LINEAR: 0x2702,
LINEAR_MIPMAP_LINEAR: 0x2703,
CLAMP_TO_EDGE: 33071,
MIRRORED_REPEAT: 33648,
REPEAT: 10497
};
var THREE_TO_WEBGL = {};
THREE_TO_WEBGL[ NearestFilter ] = WEBGL_CONSTANTS.NEAREST;
THREE_TO_WEBGL[ NearestMipmapNearestFilter ] = WEBGL_CONSTANTS.NEAREST_MIPMAP_NEAREST;
THREE_TO_WEBGL[ NearestMipmapLinearFilter ] = WEBGL_CONSTANTS.NEAREST_MIPMAP_LINEAR;
THREE_TO_WEBGL[ LinearFilter ] = WEBGL_CONSTANTS.LINEAR;
THREE_TO_WEBGL[ LinearMipmapNearestFilter ] = WEBGL_CONSTANTS.LINEAR_MIPMAP_NEAREST;
THREE_TO_WEBGL[ LinearMipmapLinearFilter ] = WEBGL_CONSTANTS.LINEAR_MIPMAP_LINEAR;
THREE_TO_WEBGL[ ClampToEdgeWrapping ] = WEBGL_CONSTANTS.CLAMP_TO_EDGE;
THREE_TO_WEBGL[ RepeatWrapping ] = WEBGL_CONSTANTS.REPEAT;
THREE_TO_WEBGL[ MirroredRepeatWrapping ] = WEBGL_CONSTANTS.MIRRORED_REPEAT;
var PATH_PROPERTIES = {
scale: 'scale',
position: 'translation',
quaternion: 'rotation',
morphTargetInfluences: 'weights'
};
//------------------------------------------------------------------------------
// GLTF Exporter
//------------------------------------------------------------------------------
var GLTFExporter = function () {};
GLTFExporter.prototype = {
constructor: GLTFExporter,
/**
* Parse scenes and generate GLTF output
* @param {Scene or [THREE.Scenes]} input Scene or Array of THREE.Scenes
* @param {Function} onDone Callback on completed
* @param {Object} options options
*/
parse: function ( input, onDone, options ) {
var DEFAULT_OPTIONS = {
binary: false,
trs: false,
onlyVisible: true,
truncateDrawRange: true,
embedImages: true,
maxTextureSize: Infinity,
animations: [],
forceIndices: false,
forcePowerOfTwoTextures: false,
includeCustomExtensions: false
};
options = Object.assign( {}, DEFAULT_OPTIONS, options );
if ( options.animations.length > 0 ) {
// Only TRS properties, and not matrices, may be targeted by animation.
options.trs = true;
}
var outputJSON = {
asset: {
version: "2.0",
generator: "GLTFExporter"
}
};
var byteOffset = 0;
var buffers = [];
var pending = [];
var nodeMap = new Map();
var skins = [];
var extensionsUsed = {};
var cachedData = {
meshes: new Map(),
attributes: new Map(),
attributesNormalized: new Map(),
materials: new Map(),
textures: new Map(),
images: new Map()
};
var cachedCanvas;
var uids = new Map();
var uid = 0;
/**
* Assign and return a temporal unique id for an object
* especially which doesn't have .uuid
* @param {Object} object
* @return {Integer}
*/
function getUID( object ) {
if ( ! uids.has( object ) ) uids.set( object, uid ++ );
return uids.get( object );
}
/**
* Compare two arrays
* @param {Array} array1 Array 1 to compare
* @param {Array} array2 Array 2 to compare
* @return {Boolean} Returns true if both arrays are equal
*/
function equalArray( array1, array2 ) {
return ( array1.length === array2.length ) && array1.every( function ( element, index ) {
return element === array2[ index ];
} );
}
/**
* Converts a string to an ArrayBuffer.
* @param {string} text
* @return {ArrayBuffer}
*/
function stringToArrayBuffer( text ) {
if ( window.TextEncoder !== undefined ) {
return new TextEncoder().encode( text ).buffer;
}
var array = new Uint8Array( new ArrayBuffer( text.length ) );
for ( var i = 0, il = text.length; i < il; i ++ ) {
var value = text.charCodeAt( i );
// Replacing multi-byte character with space(0x20).
array[ i ] = value > 0xFF ? 0x20 : value;
}
return array.buffer;
}
/**
* Get the min and max vectors from the given attribute
* @param {BufferAttribute} attribute Attribute to find the min/max in range from start to start + count
* @param {Integer} start
* @param {Integer} count
* @return {Object} Object containing the `min` and `max` values (As an array of attribute.itemSize components)
*/
function getMinMax( attribute, start, count ) {
var output = {
min: new Array( attribute.itemSize ).fill( Number.POSITIVE_INFINITY ),
max: new Array( attribute.itemSize ).fill( Number.NEGATIVE_INFINITY )
};
for ( var i = start; i < start + count; i ++ ) {
for ( var a = 0; a < attribute.itemSize; a ++ ) {
var value = attribute.array[ i * attribute.itemSize + a ];
output.min[ a ] = Math.min( output.min[ a ], value );
output.max[ a ] = Math.max( output.max[ a ], value );
}
}
return output;
}
/**
* Checks if image size is POT.
*
* @param {Image} image The image to be checked.
* @returns {Boolean} Returns true if image size is POT.
*
*/
function isPowerOfTwo( image ) {
return MathUtils.isPowerOfTwo( image.width ) && MathUtils.isPowerOfTwo( image.height );
}
/**
* Checks if normal attribute values are normalized.
*
* @param {BufferAttribute} normal
* @returns {Boolean}
*
*/
function isNormalizedNormalAttribute( normal ) {
if ( cachedData.attributesNormalized.has( normal ) ) {
return false;
}
var v = new Vector3();
for ( var i = 0, il = normal.count; i < il; i ++ ) {
// 0.0005 is from glTF-validator
if ( Math.abs( v.fromArray( normal.array, i * 3 ).length() - 1.0 ) > 0.0005 ) return false;
}
return true;
}
/**
* Creates normalized normal buffer attribute.
*
* @param {BufferAttribute} normal
* @returns {BufferAttribute}
*
*/
function createNormalizedNormalAttribute( normal ) {
if ( cachedData.attributesNormalized.has( normal ) ) {
return cachedData.attributesNormalized.get( normal );
}
var attribute = normal.clone();
var v = new Vector3();
for ( var i = 0, il = attribute.count; i < il; i ++ ) {
v.fromArray( attribute.array, i * 3 );
if ( v.x === 0 && v.y === 0 && v.z === 0 ) {
// if values can't be normalized set (1, 0, 0)
v.setX( 1.0 );
} else {
v.normalize();
}
v.toArray( attribute.array, i * 3 );
}
cachedData.attributesNormalized.set( normal, attribute );
return attribute;
}
/**
* Get the required size + padding for a buffer, rounded to the next 4-byte boundary.
* https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#data-alignment
*
* @param {Integer} bufferSize The size the original buffer.
* @returns {Integer} new buffer size with required padding.
*
*/
function getPaddedBufferSize( bufferSize ) {
return Math.ceil( bufferSize / 4 ) * 4;
}
/**
* Returns a buffer aligned to 4-byte boundary.
*
* @param {ArrayBuffer} arrayBuffer Buffer to pad
* @param {Integer} paddingByte (Optional)
* @returns {ArrayBuffer} The same buffer if it's already aligned to 4-byte boundary or a new buffer
*/
function getPaddedArrayBuffer( arrayBuffer, paddingByte ) {
paddingByte = paddingByte || 0;
var paddedLength = getPaddedBufferSize( arrayBuffer.byteLength );
if ( paddedLength !== arrayBuffer.byteLength ) {
var array = new Uint8Array( paddedLength );
array.set( new Uint8Array( arrayBuffer ) );
if ( paddingByte !== 0 ) {
for ( var i = arrayBuffer.byteLength; i < paddedLength; i ++ ) {
array[ i ] = paddingByte;
}
}
return array.buffer;
}
return arrayBuffer;
}
/**
* Serializes a userData.
*
* @param {THREE.Object3D|THREE.Material} object
* @param {Object} gltfProperty
*/
function serializeUserData( object, gltfProperty ) {
if ( Object.keys( object.userData ).length === 0 ) {
return;
}
try {
var json = JSON.parse( JSON.stringify( object.userData ) );
if ( options.includeCustomExtensions && json.gltfExtensions ) {
if ( gltfProperty.extensions === undefined ) {
gltfProperty.extensions = {};
}
for ( var extensionName in json.gltfExtensions ) {
gltfProperty.extensions[ extensionName ] = json.gltfExtensions[ extensionName ];
extensionsUsed[ extensionName ] = true;
}
delete json.gltfExtensions;
}
if ( Object.keys( json ).length > 0 ) {
gltfProperty.extras = json;
}
} catch ( error ) {
console.warn( 'THREE.GLTFExporter: userData of \'' + object.name + '\' ' +
'won\'t be serialized because of JSON.stringify error - ' + error.message );
}
}
/**
* Applies a texture transform, if present, to the map definition. Requires
* the KHR_texture_transform extension.
*/
function applyTextureTransform( mapDef, texture ) {
var didTransform = false;
var transformDef = {};
if ( texture.offset.x !== 0 || texture.offset.y !== 0 ) {
transformDef.offset = texture.offset.toArray();
didTransform = true;
}
if ( texture.rotation !== 0 ) {
transformDef.rotation = texture.rotation;
didTransform = true;
}
if ( texture.repeat.x !== 1 || texture.repeat.y !== 1 ) {
transformDef.scale = texture.repeat.toArray();
didTransform = true;
}
if ( didTransform ) {
mapDef.extensions = mapDef.extensions || {};
mapDef.extensions[ 'KHR_texture_transform' ] = transformDef;
extensionsUsed[ 'KHR_texture_transform' ] = true;
}
}
/**
* Process a buffer to append to the default one.
* @param {ArrayBuffer} buffer
* @return {Integer}
*/
function processBuffer( buffer ) {
if ( ! outputJSON.buffers ) {
outputJSON.buffers = [ { byteLength: 0 } ];
}
// All buffers are merged before export.
buffers.push( buffer );
return 0;
}
/**
* Process and generate a BufferView
* @param {BufferAttribute} attribute
* @param {number} componentType
* @param {number} start
* @param {number} count
* @param {number} target (Optional) Target usage of the BufferView
* @return {Object}
*/
function processBufferView( attribute, componentType, start, count, target ) {
if ( ! outputJSON.bufferViews ) {
outputJSON.bufferViews = [];
}
// Create a new dataview and dump the attribute's array into it
var componentSize;
if ( componentType === WEBGL_CONSTANTS.UNSIGNED_BYTE ) {
componentSize = 1;
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_SHORT ) {
componentSize = 2;
} else {
componentSize = 4;
}
var byteLength = getPaddedBufferSize( count * attribute.itemSize * componentSize );
var dataView = new DataView( new ArrayBuffer( byteLength ) );
var offset = 0;
for ( var i = start; i < start + count; i ++ ) {
for ( var a = 0; a < attribute.itemSize; a ++ ) {
// @TODO Fails on InterleavedBufferAttribute, and could probably be
// optimized for normal BufferAttribute.
var value = attribute.array[ i * attribute.itemSize + a ];
if ( componentType === WEBGL_CONSTANTS.FLOAT ) {
dataView.setFloat32( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_INT ) {
dataView.setUint32( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_SHORT ) {
dataView.setUint16( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_BYTE ) {
dataView.setUint8( offset, value );
}
offset += componentSize;
}
}
var gltfBufferView = {
buffer: processBuffer( dataView.buffer ),
byteOffset: byteOffset,
byteLength: byteLength
};
if ( target !== undefined ) gltfBufferView.target = target;
if ( target === WEBGL_CONSTANTS.ARRAY_BUFFER ) {
// Only define byteStride for vertex attributes.
gltfBufferView.byteStride = attribute.itemSize * componentSize;
}
byteOffset += byteLength;
outputJSON.bufferViews.push( gltfBufferView );
// @TODO Merge bufferViews where possible.
var output = {
id: outputJSON.bufferViews.length - 1,
byteLength: 0
};
return output;
}
/**
* Process and generate a BufferView from an image Blob.
* @param {Blob} blob
* @return {Promise<Integer>}
*/
function processBufferViewImage( blob ) {
if ( ! outputJSON.bufferViews ) {
outputJSON.bufferViews = [];
}
return new Promise( function ( resolve ) {
var reader = new window.FileReader();
reader.readAsArrayBuffer( blob );
reader.onloadend = function () {
var buffer = getPaddedArrayBuffer( reader.result );
var bufferView = {
buffer: processBuffer( buffer ),
byteOffset: byteOffset,
byteLength: buffer.byteLength
};
byteOffset += buffer.byteLength;
outputJSON.bufferViews.push( bufferView );
resolve( outputJSON.bufferViews.length - 1 );
};
} );
}
/**
* Process attribute to generate an accessor
* @param {BufferAttribute} attribute Attribute to process
* @param {BufferGeometry} geometry (Optional) Geometry used for truncated draw range
* @param {Integer} start (Optional)
* @param {Integer} count (Optional)
* @return {Integer} Index of the processed accessor on the "accessors" array
*/
function processAccessor( attribute, geometry, start, count ) {
var types = {
1: 'SCALAR',
2: 'VEC2',
3: 'VEC3',
4: 'VEC4',
16: 'MAT4'
};
var componentType;
// Detect the component type of the attribute array (float, uint or ushort)
if ( attribute.array.constructor === Float32Array ) {
componentType = WEBGL_CONSTANTS.FLOAT;
} else if ( attribute.array.constructor === Uint32Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_INT;
} else if ( attribute.array.constructor === Uint16Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_SHORT;
} else if ( attribute.array.constructor === Uint8Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_BYTE;
} else {
throw new Error( 'THREE.GLTFExporter: Unsupported bufferAttribute component type.' );
}
if ( start === undefined ) start = 0;
if ( count === undefined ) count = attribute.count;
// @TODO Indexed buffer geometry with drawRange not supported yet
if ( options.truncateDrawRange && geometry !== undefined && geometry.index === null ) {
var end = start + count;
var end2 = geometry.drawRange.count === Infinity
? attribute.count
: geometry.drawRange.start + geometry.drawRange.count;
start = Math.max( start, geometry.drawRange.start );
count = Math.min( end, end2 ) - start;
if ( count < 0 ) count = 0;
}
// Skip creating an accessor if the attribute doesn't have data to export
if ( count === 0 ) {
return null;
}
var minMax = getMinMax( attribute, start, count );
var bufferViewTarget;
// If geometry isn't provided, don't infer the target usage of the bufferView. For
// animation samplers, target must not be set.
if ( geometry !== undefined ) {
bufferViewTarget = attribute === geometry.index ? WEBGL_CONSTANTS.ELEMENT_ARRAY_BUFFER : WEBGL_CONSTANTS.ARRAY_BUFFER;
}
var bufferView = processBufferView( attribute, componentType, start, count, bufferViewTarget );
var gltfAccessor = {
bufferView: bufferView.id,
byteOffset: bufferView.byteOffset,
componentType: componentType,
count: count,
max: minMax.max,
min: minMax.min,
type: types[ attribute.itemSize ]
};
if ( ! outputJSON.accessors ) {
outputJSON.accessors = [];
}
outputJSON.accessors.push( gltfAccessor );
return outputJSON.accessors.length - 1;
}
/**
* Process image
* @param {Image} image to process
* @param {Integer} format of the image (e.g. THREE.RGBFormat, RGBAFormat etc)
* @param {Boolean} flipY before writing out the image
* @return {Integer} Index of the processed texture in the "images" array
*/
function processImage( image, format, flipY ) {
if ( ! cachedData.images.has( image ) ) {
cachedData.images.set( image, {} );
}
var cachedImages = cachedData.images.get( image );
var mimeType = format === RGBAFormat ? 'image/png' : 'image/jpeg';
var key = mimeType + ":flipY/" + flipY.toString();
if ( cachedImages[ key ] !== undefined ) {
return cachedImages[ key ];
}
if ( ! outputJSON.images ) {
outputJSON.images = [];
}
var gltfImage = { mimeType: mimeType };
if ( options.embedImages ) {
var canvas = cachedCanvas = cachedCanvas || document.createElement( 'canvas' );
canvas.width = Math.min( image.width, options.maxTextureSize );
canvas.height = Math.min( image.height, options.maxTextureSize );
if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( canvas ) ) {
console.warn( 'GLTFExporter: Resized non-power-of-two image.', image );
canvas.width = MathUtils.floorPowerOfTwo( canvas.width );
canvas.height = MathUtils.floorPowerOfTwo( canvas.height );
}
var ctx = canvas.getContext( '2d' );
if ( flipY === true ) {
ctx.translate( 0, canvas.height );
ctx.scale( 1, - 1 );
}
ctx.drawImage( image, 0, 0, canvas.width, canvas.height );
if ( options.binary === true ) {
pending.push( new Promise( function ( resolve ) {
canvas.toBlob( function ( blob ) {
processBufferViewImage( blob ).then( function ( bufferViewIndex ) {
gltfImage.bufferView = bufferViewIndex;
resolve();
} );
}, mimeType );
} ) );
} else {
gltfImage.uri = canvas.toDataURL( mimeType );
}
} else {
gltfImage.uri = image.src;
}
outputJSON.images.push( gltfImage );
var index = outputJSON.images.length - 1;
cachedImages[ key ] = index;
return index;
}
/**
* Process sampler
* @param {Texture} map Texture to process
* @return {Integer} Index of the processed texture in the "samplers" array
*/
function processSampler( map ) {
if ( ! outputJSON.samplers ) {
outputJSON.samplers = [];
}
var gltfSampler = {
magFilter: THREE_TO_WEBGL[ map.magFilter ],
minFilter: THREE_TO_WEBGL[ map.minFilter ],
wrapS: THREE_TO_WEBGL[ map.wrapS ],
wrapT: THREE_TO_WEBGL[ map.wrapT ]
};
outputJSON.samplers.push( gltfSampler );
return outputJSON.samplers.length - 1;
}
/**
* Process texture
* @param {Texture} map Map to process
* @return {Integer} Index of the processed texture in the "textures" array
*/
function processTexture( map ) {
if ( cachedData.textures.has( map ) ) {
return cachedData.textures.get( map );
}
if ( ! outputJSON.textures ) {
outputJSON.textures = [];
}
var gltfTexture = {
sampler: processSampler( map ),
source: processImage( map.image, map.format, map.flipY )
};
if ( map.name ) {
gltfTexture.name = map.name;
}
outputJSON.textures.push( gltfTexture );
var index = outputJSON.textures.length - 1;
cachedData.textures.set( map, index );
return index;
}
/**
* Process material
* @param {THREE.Material} material Material to process
* @return {Integer} Index of the processed material in the "materials" array
*/
function processMaterial( material ) {
if ( cachedData.materials.has( material ) ) {
return cachedData.materials.get( material );
}
if ( ! outputJSON.materials ) {
outputJSON.materials = [];
}
if ( material.isShaderMaterial && ! material.isGLTFSpecularGlossinessMaterial ) {
console.warn( 'GLTFExporter: THREE.ShaderMaterial not supported.' );
return null;
}
// @QUESTION Should we avoid including any attribute that has the default value?
var gltfMaterial = {
pbrMetallicRoughness: {}
};
if ( material.isMeshBasicMaterial ) {
gltfMaterial.extensions = { KHR_materials_unlit: {} };
extensionsUsed[ 'KHR_materials_unlit' ] = true;
} else if ( material.isGLTFSpecularGlossinessMaterial ) {
gltfMaterial.extensions = { KHR_materials_pbrSpecularGlossiness: {} };
extensionsUsed[ 'KHR_materials_pbrSpecularGlossiness' ] = true;
} else if ( ! material.isMeshStandardMaterial ) {
console.warn( 'GLTFExporter: Use MeshStandardMaterial or MeshBasicMaterial for best results.' );
}
// pbrMetallicRoughness.baseColorFactor
var color = material.color.toArray().concat( [ material.opacity ] );
if ( ! equalArray( color, [ 1, 1, 1, 1 ] ) ) {
gltfMaterial.pbrMetallicRoughness.baseColorFactor = color;
}
if ( material.isMeshStandardMaterial ) {
gltfMaterial.pbrMetallicRoughness.metallicFactor = material.metalness;
gltfMaterial.pbrMetallicRoughness.roughnessFactor = material.roughness;
} else if ( material.isMeshBasicMaterial ) {
gltfMaterial.pbrMetallicRoughness.metallicFactor = 0.0;
gltfMaterial.pbrMetallicRoughness.roughnessFactor = 0.9;
} else {
gltfMaterial.pbrMetallicRoughness.metallicFactor = 0.5;
gltfMaterial.pbrMetallicRoughness.roughnessFactor = 0.5;
}
// pbrSpecularGlossiness diffuse, specular and glossiness factor
if ( material.isGLTFSpecularGlossinessMaterial ) {
if ( gltfMaterial.pbrMetallicRoughness.baseColorFactor ) {
gltfMaterial.extensions.KHR_materials_pbrSpecularGlossiness.diffuseFactor = gltfMaterial.pbrMetallicRoughness.baseColorFactor;
}
var specularFactor = [ 1, 1, 1 ];
material.specular.toArray( specularFactor, 0 );
gltfMaterial.extensions.KHR_materials_pbrSpecularGlossiness.specularFactor = specularFactor;
gltfMaterial.extensions.KHR_materials_pbrSpecularGlossiness.glossinessFactor = material.glossiness;
}