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GLTFExporter.js
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import * as THREE from "three"
//------------------------------------------------------------------------------
// 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 identityArray = [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
var THREE_TO_WEBGL = {};
THREE_TO_WEBGL[THREE.NearestFilter] = WEBGL_CONSTANTS.NEAREST;
THREE_TO_WEBGL[THREE.NearestMipmapNearestFilter] = WEBGL_CONSTANTS.NEAREST_MIPMAP_NEAREST;
THREE_TO_WEBGL[THREE.NearestMipmapLinearFilter] = WEBGL_CONSTANTS.NEAREST_MIPMAP_LINEAR;
THREE_TO_WEBGL[THREE.LinearFilter] = WEBGL_CONSTANTS.LINEAR;
THREE_TO_WEBGL[THREE.LinearMipmapNearestFilter] = WEBGL_CONSTANTS.LINEAR_MIPMAP_NEAREST;
THREE_TO_WEBGL[THREE.LinearMipmapLinearFilter] = WEBGL_CONSTANTS.LINEAR_MIPMAP_LINEAR;
THREE_TO_WEBGL[THREE.ClampToEdgeWrapping] = WEBGL_CONSTANTS.CLAMP_TO_EDGE;
THREE_TO_WEBGL[THREE.RepeatWrapping] = WEBGL_CONSTANTS.REPEAT;
THREE_TO_WEBGL[THREE.MirroredRepeatWrapping] = WEBGL_CONSTANTS.MIRRORED_REPEAT;
var PATH_PROPERTIES = {
scale: 'scale',
position: 'translation',
quaternion: 'rotation',
morphTargetInfluences: 'weights'
};
//------------------------------------------------------------------------------
// GLTF Exporter
//------------------------------------------------------------------------------
const GLTFExporter = function () { };
GLTFExporter.prototype = {
constructor: GLTFExporter,
/**
* Parse scenes and generate GLTF output
* @param {THREE.Scene or [THREE.Scenes]} input THREE.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: true,
trs: false,
onlyVisible: true,
truncateDrawRange: true,
embedImages: false,
maxTextureSize: Infinity,
animations: [],
includeCustomExtensions: false,
textureUrlWithoutDomainName: false,
customizeTextureUrlMap: null,
};
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: 'THREE.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];
});
}
/**
* Is identity matrix
*
* @param {THREE.Matrix4} matrix
* @returns {Boolean} Returns true, if parameter is identity matrix
*/
function isIdentityMatrix(matrix) {
return equalArray(matrix.elements, identityArray);
}
/**
* Converts a string to an ArrayBuffer.
* @param {string} text
* @return {ArrayBuffer}
*/
function stringToArrayBuffer(text) {
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 {THREE.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;
if (attribute.itemSize > 4) {
// no support for interleaved data for itemSize > 4
value = attribute.array[i * attribute.itemSize + a];
} else {
if (a === 0) value = attribute.getX(i);
else if (a === 1) value = attribute.getY(i);
else if (a === 2) value = attribute.getZ(i);
else if (a === 3) value = attribute.getW(i);
}
output.min[a] = Math.min(output.min[a], value);
output.max[a] = Math.max(output.max[a], value);
}
}
return output;
}
/**
* Checks if normal attribute values are normalized.
*
* @param {THREE.BufferAttribute} normal
* @returns {Boolean}
*
*/
function isNormalizedNormalAttribute(normal) {
if (cachedData.attributesNormalized.has(normal)) {
return false;
}
var v = new THREE.Vector3();
for (var i = 0, il = normal.count; i < il; i++) {
// 0.0005 is from glTF-validator
if (Math.abs(v.fromBufferAttribute(normal, i).length() - 1.0) > 0.0005) return false;
}
return true;
}
/**
* Creates normalized normal buffer attribute.
*
* @param {THREE.BufferAttribute} normal
* @returns {THREE.BufferAttribute}
*
*/
function createNormalizedNormalAttribute(normal) {
if (cachedData.attributesNormalized.has(normal)) {
return cachedData.attributesNormalized.get(normal);
}
var attribute = normal.clone();
var v = new THREE.Vector3();
for (var i = 0, il = attribute.count; i < il; i++) {
v.fromBufferAttribute(attribute, i);
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();
}
attribute.setXYZ(i, v.x, v.y, v.z);
}
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 {THREE.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++) {
var value;
if (attribute.itemSize > 4) {
// no support for interleaved data for itemSize > 4
value = attribute.array[i * attribute.itemSize + a];
} else {
if (a === 0) value = attribute.getX(i);
else if (a === 1) value = attribute.getY(i);
else if (a === 2) value = attribute.getZ(i);
else if (a === 3) value = attribute.getW(i);
}
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 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 {THREE.BufferAttribute} attribute Attribute to process
* @param {THREE.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 (attribute.normalized === true) {
gltfAccessor.normalized = true;
}
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, THREE.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 === THREE.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);
var ctx = canvas.getContext('2d');
if (flipY === true) {
ctx.translate(0, canvas.height);
ctx.scale(1, - 1);
}
if ((typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement) ||
(typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement) ||
(typeof OffscreenCanvas !== 'undefined' && image instanceof OffscreenCanvas) ||
(typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap)) {
ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
} else {
if (format !== THREE.RGBAFormat && format !== THREE.RGBFormat) {
console.error('GLTFExporter: Only RGB and RGBA formats are supported.');
}
if (image.width > options.maxTextureSize || image.height > options.maxTextureSize) {
console.warn('GLTFExporter: Image size is bigger than maxTextureSize', image);
}
let data = image.data;
if (format === THREE.RGBFormat) {
data = new Uint8ClampedArray(image.height * image.width * 4);
for (var i = 0, j = 0; i < data.length; i += 4, j += 3) {
data[i + 0] = image.data[j + 0];
data[i + 1] = image.data[j + 1];
data[i + 2] = image.data[j + 2];
data[i + 3] = 255;
}
}
ctx.putImageData(new ImageData(data, image.width, image.height), 0, 0);
}
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 {
if (options.customizeTextureUrlMap instanceof Map && options.customizeTextureUrlMap.has(image.src)) {
gltfImage.uri = options.customizeTextureUrlMap.get(image.src)
} else if (options.textureUrlWithoutDomainName) {
gltfImage.uri = image.src.replace(/^(http|https):\/\/[^/]+/, "");
} 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 (material.isShaderMaterial) {
console.warn('GLTFExporter: THREE.ShaderMaterial not supported.');
return null;
}
if (!outputJSON.materials) {
outputJSON.materials = [];
}
// @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]);