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GLTFLoader.js
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/* eslint no-loop-func: 0 */
import { getTypedArrayTypeFromGLType } from '../renderer/typedArray';
import { ShaderParams, TextureFilters } from '../renderer/constant';
import { Model } from '../model/Model';
import { Mesh } from '../model/Primatives';
import { Node } from '../scene/Node';
import { Matrix4 } from '../math/Matrix4';
import { FileLoader } from './Fileloader';
import { PerspectiveCamera, OrthographicCamera } from '../camera/Camera';
import { PMath } from '../math/Math';
function GLTFLoader() {
this.currentSceneName = 'null';
}
function errorMiss( nodeType, index ) {
if ( index !== undefined )
console.error( `glTF not have ${nodeType} on index ${index}` );
else
console.error( `glTF not have ${nodeType} property` );
return false;
}
Object.defineProperties( GLTFLoader, {
version: {
get() {
if ( this.version )
return this.version;
else if ( this.json ) {
if ( ! this.json.asset )
return errorMiss( 'asset' );
this.version = this.json.asset.version;
if ( this.json.asset.minVersion )
this.version += `\r minVersion${this.json.asset.minVersion}`;
return this.version;
}
console.warn( 'glTF not loaded.' );
return null;
},
},
generator: {
get() {
return this._generator;
},
},
} );
Object.assign( GLTFLoader.prototype, {
load( file, sceneId ) {
const name = 'GLTFLOADER';
const loader = new FileLoader( { file, name } );
return loader.load()
.then( res => this.parse( res[ name ], sceneId ) );
},
parse( json, sceneId ) {
this.gltf = json;
const { version, generator } = this.gltf.asset;
this._generator = generator;
if ( version !== '2.0' ) {
console.error( `GlTFLoader only support glTF 2.0 for now! Received glTF version: ${this.version}` );
return false;
}
const result = {
nodes: this.parseScene( sceneId ),
animations: this.parseAnimations(),
name: this.currentSceneName,
};
return this.convertToNode( result );
},
parseAnimations() {
const result = [];
const animations = this.gltf.animations;
if ( animations )
for ( let i = 0; i < animations.length; i ++ ) {
const animation = animations[ i ];
const { name, channels, samplers } = animation;
const clips = [];
if ( channels && samplers )
for ( let j = 0; j < channels.length; j ++ ) {
const channel = channels[ j ];
const sampler = samplers[ channel.sampler ];
if ( ! sampler ) {
errorMiss( `animations[${i}].channels[${j}].sampler`, channel.sampler );
continue;
}
const input = this.parseAccessor( sampler.input ).data;
const outputData = this.parseAccessor( sampler.output );
const output = outputData.data;
const numComponents = outputData.numComponents;
const interpolation = sampler.interpolation || 'LINEAR';
const gltfNodeIdx = channel.target.node;
const path = channel.target.path;
if ( ! input || ! output ) continue;
let combinedOutput = output;
if ( numComponents !== 1 || input.length !== output.length ) {
const numComp = output.length / input.length;
combinedOutput = [];
for ( let k = 0; k < input.length; k ++ )
combinedOutput.push( output.slice( numComp * k, numComp * ( k + 1 ) ) );
}
let nodeProperty = path;
const extras = {};
switch ( path ) {
case 'translation':
nodeProperty = 'position';
break;
case 'rotation':
nodeProperty = 'quaternion';
break;
case 'scale':
nodeProperty = 'scale';
break;
case 'weights':
nodeProperty = 'weights';
extras.uniformName = GLTFLoader.MORPH_WEIGHT_UNIFORM;
break;
default:
console.error( `unsupported animation sampler path ${path}` );
nodeProperty = false;
}
if ( ! nodeProperty ) continue;
const clip = {
times: input,
values: combinedOutput,
findFlag: GLTFLoader.GLTF_NODE_INDEX_PROPERTY,
findValue: gltfNodeIdx,
targetProp: nodeProperty,
method: interpolation,
extras,
};
clips.push( clip );
}
result.push( {
name: name || String( i ),
clips,
} );
}
return result;
},
parseScene( sceneId ) {
const loadScene = sceneId || this.gltf.scene || 0;
const scene = this.gltf.scenes[ loadScene ];
if ( typeof scene === 'undefined' )
return errorMiss( 'scene', loadScene );
this.currentSceneName = scene.name || 'GLTF_NO_NAME_SCENE';
const result = [];
const nodes = scene.nodes;
for ( let i = 0; i < nodes.length; i ++ ) {
const node = this.parseNode( nodes[ i ] );
if ( node )
result.push( node );
}
return result;
},
convertToNode( infos ) {
const rootNode = new Node( infos.name );
const nodes = infos.nodes;
const animations = infos.animations;
const textures = [];
const skins = [];
const cameras = [];
function parseNode( nodeInfo, parentNode ) {
const node = new Node( nodeInfo.name );
node[ GLTFLoader.GLTF_NODE_INDEX_PROPERTY ] = nodeInfo.nodeId;
if ( nodeInfo.matrix ) {
nodeInfo.translation = [ 0, 0, 0 ]; // eslint-disable-line
nodeInfo.rotation = [ 0, 0, 0, 1 ]; // eslint-disable-line
nodeInfo.scale = [ 1, 1, 1 ]; // eslint-disable-line
Matrix4.decompose( nodeInfo.matrix, nodeInfo.translation, nodeInfo.rotation, nodeInfo.scale );
}
if ( nodeInfo.translation )
node.position = nodeInfo.translation;
if ( nodeInfo.rotation )
node.quaternion = nodeInfo.rotation;
if ( nodeInfo.scale )
node.scale = nodeInfo.scale;
parentNode.addChild( node );
if ( nodeInfo.camera ) {
const camera = nodeInfo.camera;
if ( camera.type === 'perspective' ) {
const {
yfov, znear, aspectRatio, zfar, name,
} = camera;
const fov = PMath.radian2Degree( yfov );
const fixAspectRatio = typeof aspectRatio !== 'undefined';
const far = zfar === undefined ? Number.POSITIVE_INFINITY : zfar;
const perspectiveCamera = new PerspectiveCamera( fov, aspectRatio, znear, far, fixAspectRatio );
perspectiveCamera.name = name;
node.setCamera( perspectiveCamera );
perspectiveCamera.rawData = camera;
cameras.push( perspectiveCamera );
}
if ( camera.type === 'orthographic' ) {
const {
name, xmag, ymag, zfar, znear,
} = camera;
const orthographicCamera = new OrthographicCamera( ymag, xmag / ymag, znear, zfar, true );
orthographicCamera.name = name;
node.setCamera( orthographicCamera );
orthographicCamera.rawData = camera;
cameras.push( orthographicCamera );
}
}
if ( nodeInfo.primitives ) {
const models = [];
for ( let i = 0; i < nodeInfo.primitives.length; i ++ ) {
const primitive = nodeInfo.primitives[ i ];
const { attribArrays, modelName, drawMode } = primitive;
if ( ! primitive.attribArrays.mesh ) {
const mesh = new Mesh( primitive.meshName, attribArrays );
primitive.attribArrays = { attribArrays, mesh };
}
const model = new Model( primitive.attribArrays.mesh );
model.name = modelName;
model.drawMode = drawMode;
const uniformobj = {};
const skinDefines = ( nodeInfo.skin && nodeInfo.skin.defines ) || [];
model.defines = primitive.defines.concat( skinDefines );
// parse material
if ( primitive.material ) {
const {
baseColorTexture, baseColorFactor, metallicFactor, roughnessFactor, doubleSided,
metallicRoughnessTexture, normalTexture, occlusionTexture, emissiveTexture, enableBlend, alphaCutoff,
} = primitive.material;
model.mesh.cullFace = ! doubleSided;
model.mesh.sampleBlend = !! enableBlend;
if ( alphaCutoff !== undefined )
uniformobj[ GLTFLoader.ALPHA_CUTOFF_UNIFORM ] = alphaCutoff;
uniformobj[ GLTFLoader.BASE_COLOR_UNIFORM ] = baseColorFactor;
uniformobj[ GLTFLoader.METALROUGHNESS_UNIFORM ] = [ metallicFactor, roughnessFactor ];
if ( baseColorTexture && baseColorTexture.texture ) {
const idx = textures.indexOf( baseColorTexture.texture );
if ( idx < 0 ) {
textures.push( baseColorTexture.texture );
baseColorTexture.textureIdx = textures.length - 1;
}
if ( ! model.textures ) model.textures = {};
if ( baseColorTexture.textureIdx === undefined ) baseColorTexture.textureIdx = idx;
model.textures[ GLTFLoader.BASE_COLOR_TEXTURE_UNIFORM ] = baseColorTexture.textureIdx;
}
if ( metallicRoughnessTexture && metallicRoughnessTexture.texture ) {
const idx = textures.indexOf( metallicRoughnessTexture.texture );
if ( idx < 0 ) {
textures.push( metallicRoughnessTexture.texture );
metallicRoughnessTexture.textureIdx = textures.length - 1;
}
if ( ! model.textures ) model.textures = {};
if ( metallicRoughnessTexture.textureIdx === undefined ) metallicRoughnessTexture.textureIdx = idx;
model.textures[ GLTFLoader.METALROUGHNESS_TEXTURE_UNIFORM ] = metallicRoughnessTexture.textureIdx;
}
if ( normalTexture && normalTexture.texture ) {
const idx = textures.indexOf( normalTexture.texture );
if ( idx < 0 ) {
textures.push( normalTexture.texture );
normalTexture.textureIdx = textures.length - 1;
}
if ( ! model.textures ) model.textures = {};
if ( normalTexture.textureIdx === undefined ) normalTexture.textureIdx = idx;
model.textures[ GLTFLoader.NORMAL_TEXTURE_UNIFORM ] = normalTexture.textureIdx;
uniformobj[ GLTFLoader.NORMAL_SCALE_UNIFORM ] = normalTexture.scale;
}
if ( occlusionTexture && occlusionTexture.texture ) {
const idx = textures.indexOf( occlusionTexture.texture );
if ( idx < 0 ) {
textures.push( occlusionTexture.texture );
occlusionTexture.textureIdx = textures.length - 1;
}
if ( ! model.textures ) model.textures = {};
if ( occlusionTexture.textureIdx === undefined ) occlusionTexture.textureIdx = idx;
model.textures[ GLTFLoader.OCCLUSION_TEXTURE_UNIFORM ] = occlusionTexture.textureIdx;
uniformobj[ GLTFLoader.OCCLUSION_FACTOR_UNIFORM ] = occlusionTexture.strength;
}
if ( emissiveTexture && emissiveTexture.texture ) {
const idx = textures.indexOf( emissiveTexture.texture );
if ( idx < 0 ) {
textures.push( emissiveTexture.texture );
emissiveTexture.textureIdx = textures.length - 1;
}
if ( ! model.textures ) model.textures = {};
if ( emissiveTexture.textureIdx === undefined ) emissiveTexture.textureIdx = idx;
model.textures[ GLTFLoader.EMISSIVE_TEXTURE_UNIFORM ] = emissiveTexture.textureIdx;
uniformobj[ GLTFLoader.EMISSIVE_FACTOR_UNIFORM ] = emissiveTexture.emissiveFactor;
}
}
// morph targets
if ( primitive.weights )
uniformobj[ GLTFLoader.MORPH_WEIGHT_UNIFORM ] = primitive.weights;
model.setUniformObj( uniformobj );
if ( nodeInfo.primitives.length < 2 )
node.setModel( model );
else
node.addChild( model );
models.push( model );
}
if ( node.children.length > 0 )
node.gltfPrimitives = node.children;
if ( nodeInfo.skin )
if ( skins.indexOf( nodeInfo.skin ) > - 1 )
nodeInfo.skin.models.push( ...models );
else {
node.skin = Object.assign( nodeInfo.skin, { models } );
skins.push( node.skin );
}
}
return node;
}
function trivarse( trivarseFun, parentNode, nodeInfos ) {
for ( let i = 0; i < nodeInfos.length; i ++ ) {
const node = trivarseFun( nodeInfos[ i ], parentNode );
trivarse( trivarseFun, node, nodeInfos[ i ].children );
}
}
trivarse( parseNode, rootNode, nodes );
// apply skins
if ( skins.length ) {
const handlers = []; // help uglify use different name
for ( let i = 0; i < skins.length; i ++ ) {
const {
joints, skeleton, inverseBindMatrices, models,
} = skins[ i ];
const jointNum = joints.length;
const globalJointTransformNodes = [];
for ( let j = 0; j < jointNum; j ++ )
globalJointTransformNodes[ j ] = rootNode.findInChildren( GLTFLoader.GLTF_NODE_INDEX_PROPERTY, joints[ j ] );
let skeletonNode;
if ( skeleton !== GLTFLoader.SCENE_ROOT_SKELETON )
skeletonNode = rootNode.findInChildren( GLTFLoader.GLTF_NODE_INDEX_PROPERTY, skeleton );
else
skeletonNode = rootNode;
skins[ i ].skeletonNode = skeletonNode; // do not know how to use it
const frag = new Array( 16 );
const fragWorld = new Array( 16 );
handlers[ i ] = function updateJointUniformFunc() {
for ( let k = 0; k < models.length; k ++ ) {
const model = models[ k ];
const globalTransformNode = model.node;
let jointMats = [];
Matrix4.invert( fragWorld, globalTransformNode.transform.getWorldMatrix() );
for ( let n = 0; n < jointNum; n ++ ) {
Matrix4.mult( frag, fragWorld, globalJointTransformNodes[ n ].transform.getWorldMatrix() );
if ( inverseBindMatrices[ n ] !== GLTFLoader.IDENTITY_INVERSE_BIND_MATRICES )
Matrix4.mult( frag, frag, inverseBindMatrices[ n ] );
jointMats = jointMats.concat( frag );
}
const uniformObj = {};
uniformObj[ GLTFLoader.JOINT_MATRICES_UNIFORM ] = jointMats;
model.setUniformObj( uniformObj );
}
};
rootNode.afterUpdateMatrix.push( {
type: 'skin', skinName: skins[ i ].name, handler: handlers[ i ], trigerNodes: [ skeletonNode, ...globalJointTransformNodes ],
} );
}
}
// animations
for ( let i = 0; i < animations.length; i ++ ) {
const { clips } = animations[ i ];
let animateMaxTime = Number.NEGATIVE_INFINITY;
let animateMinTime = Number.POSITIVE_INFINITY;
for ( let j = 0; j < clips.length; j ++ ) {
const {
findFlag, findValue, targetProp, times, extras, // method,
} = clips[ j ];
const node = rootNode.findInChildren( findFlag, findValue );
let targetNodes = [ node ];
if ( ! node.model && node.gltfPrimitives )
targetNodes = node.gltfPrimitives;
let setTarget;
let resetTarget;
if ( targetProp === 'weights' ) {
const resetObj = {};
resetObj[ GLTFLoader.MORPH_WEIGHT_UNIFORM ] = targetNodes[ 0 ].model.uniformObj[ GLTFLoader.MORPH_WEIGHT_UNIFORM ];
resetTarget = function () {
targetNodes.forEach( ( n ) => {
n.model.setUniformObj( resetObj );
} );
};
setTarget = function ( v ) {
const uniformobj = {};
uniformobj[ extras.uniformName ] = v;
targetNodes.forEach( ( n ) => {
n.model.setUniformObj( uniformobj );
} );
};
} else {
const defaultValues = [];
for ( let m = 0; m < targetNodes.length; m ++ )
defaultValues[ m ] = targetNodes[ m ][ targetProp ];
resetTarget = function () {
for ( let m = 0; m < targetNodes.length; m ++ )
targetNodes[ m ][ targetProp ] = defaultValues[ m ];
};
setTarget = function ( v ) {
targetNodes.forEach( ( n ) => {
n[ targetProp ] = v; // eslint-disable-line
} );
};
}
animateMinTime = animateMinTime < times[ 0 ] ? animateMinTime : times[ 0 ];
animateMaxTime = animateMaxTime > times[ times.length - 1 ] ? animateMaxTime : times[ times.length - 1 ];
Object.assign( clips[ j ], { setTarget, resetTarget } );
}
Object.assign( animations[ i ], { animateMinTime, animateMaxTime } );
}
const animas = { animations, type: 'gltf' };
return {
rootNode, textures, animations: animas, cameras,
};
},
parseNode( nodeId ) {
const node = this.gltf.nodes[ nodeId ];
if ( ! node )
return errorMiss( 'node', nodeId );
if ( node.isParsed )
return node.dnode;
const {
name, matrix, translation, rotation, scale,
} = node;
const dnode = {
name,
matrix,
translation,
rotation,
scale,
nodeId,
};
if ( node.camera !== undefined )
dnode.camera = this.parseCamera( node.camera );
if ( node.mesh !== undefined )
dnode.primitives = this.parseMesh( node.mesh );
if ( node.skin !== undefined ) {
const skin = this.parseSkin( node.skin );
if ( skin )
dnode.skin = skin;
}
dnode.children = [];
if ( node.children )
for ( let i = 0; i < node.children.length; i ++ )
dnode.children.push( this.parseNode( node.children[ i ] ) );
node.dnode = dnode;
node.isParsed = true;
return node.dnode;
},
parseCamera( cameraId ) {
const camera = this.gltf.cameras[ cameraId ];
if ( ! camera )
return errorMiss( 'camera', cameraId );
if ( camera.isParsed )
return camera.dcamera;
camera.isParsed = true;
camera.dcamera = false;
const {
name, type, perspective, orthographic,
} = camera;
if ( type === 'perspective' && perspective ) {
const {
aspectRatio, yfov, zfar, znear,
} = perspective;
camera.dcamera = Object.assign( {}, {
name,
type,
yfov,
znear,
aspectRatio,
zfar,
} );
} else if ( type === 'orthographic' && orthographic ) {
const {
xmag, ymag, zfar, znear,
} = orthographic;
camera.dcamera = Object.assign( {}, {
name,
type,
xmag,
ymag,
zfar,
znear,
} );
}
return camera.dcamera;
},
parseSkin( skinId ) {
const skin = this.gltf.skins[ skinId ];
if ( ! skin )
return errorMiss( 'skin', skinId );
if ( skin.isParsed )
return skin.dskin;
const {
name, joints, inverseBindMatrices, skeleton,
} = skin;
if ( ! joints )
return errorMiss( 'skin.joints', skinId );
skin.isParsed = true;
skin.dskin = false;
let dskin = { name, joints, defines: [ GLTFLoader.getJointsNumDefine( joints.length ) ] };
dskin.skeleton = skeleton === undefined ? GLTFLoader.SCENE_ROOT_SKELETON : skeleton;
dskin.inverseBindMatrices = GLTFLoader.IDENTITY_INVERSE_BIND_MATRICES;
if ( inverseBindMatrices !== undefined ) {
const accessor = this.parseAccessor( inverseBindMatrices );
if ( accessor ) {
const array = accessor.data;
const matrices = [];
for ( let i = 0; i < array.length; i += 16 )
matrices.push( array.slice( i, i + 16 ) );
dskin.inverseBindMatrices = matrices;
} else
dskin = false;
}
skin.dskin = dskin;
return skin.dskin;
},
parseMesh( meshId ) {
const mesh = this.gltf.meshes[ meshId ];
if ( ! mesh )
return errorMiss( 'mesh', meshId );
if ( mesh.isParsed )
return mesh.dprimitives;
const primitives = mesh.primitives;
const dprimitives = [];
for ( let i = 0; i < primitives.length; i ++ ) {
const primitive = primitives[ i ];
const {
attributes, indices, material, mode, name, targets,
} = primitive;
const dprimitive = {
attribArrays: {},
defines: [],
};
let hasNormal = false;
let hasTangent = false;
let texCoordNum = 0;
let jointVec8 = false;
let vertexColor = 0;
Object.keys( attributes ).forEach( ( attribute ) => {
const accessor = this.parseAccessor( attributes[ attribute ] );
if ( accessor ) {
let attribName;
switch ( attribute ) {
case 'POSITION':
attribName = ShaderParams.ATTRIB_POSITION_NAME;
break;
case 'NORMAL':
attribName = ShaderParams.ATTRIB_NORMAL_NAME;
hasNormal = true;
break;
case 'TANGENT':
attribName = ShaderParams.ATTRIB_TANGENT_NAME;
hasTangent = true;
break;
case 'TEXCOORD_0':
attribName = ShaderParams.ATTRIB_UV_NAME;
texCoordNum ++;
break;
case 'TEXCOORD_1':
attribName = ShaderParams.ATTRIB_UV_1_NAME;
texCoordNum ++;
break;
case 'JOINTS_0':
attribName = ShaderParams.ATTRIB_JOINT_0_NAME;
break;
case 'JOINTS_1':
attribName = ShaderParams.ATTRIB_JOINT_1_NAME;
jointVec8 = true;
break;
case 'WEIGHTS_0':
attribName = ShaderParams.ATTRIB_WEIGHT_0_NAME;
break;
case 'WEIGHTS_1':
attribName = ShaderParams.ATTRIB_WEIGHT_1_NAME;
break;
case 'COLOR_0':
attribName = ShaderParams.ATTRIB_VERTEX_COLOR_NAME;
vertexColor = accessor.numComponents;
break;
default:
attribName = attribute;
}
dprimitive.attribArrays[ attribName ] = accessor;
}
} );
if ( hasNormal ) dprimitive.defines.push( GLTFLoader.getHasNormalDefine() );
if ( hasTangent ) dprimitive.defines.push( GLTFLoader.getHasTangentDefine() );
if ( texCoordNum ) dprimitive.defines.push( GLTFLoader.getTexCoordDefine( texCoordNum ) );
if ( jointVec8 ) dprimitive.defines.push( GLTFLoader.getJointVec8Define() );
if ( vertexColor ) dprimitive.defines.push( GLTFLoader.getVertexColorDefine( vertexColor ) );
if ( indices !== undefined ) {
const accessor = this.parseAccessor( indices );
if ( accessor )
dprimitive.attribArrays.indices = accessor;
}
const dmaterial = this.parseMaterial( material );
if ( dmaterial ) {
dprimitive.material = dmaterial;
dprimitive.defines = dprimitive.defines.concat( dmaterial.defines );
}
dprimitive.drawMode = mode === undefined ? 4 : mode;
dprimitive.meshName = name || GLTFLoader.getMeshNameCounter();
dprimitive.modelName = mesh.name || GLTFLoader.getModelNameCounter();
if ( targets ) {
dprimitive.defines.push( GLTFLoader.getMorphTargetsDefine( targets.length ) );
let hasPositions = false;
let hasNormals = false;
let hasTangents = false;
for ( let j = 0; j < targets.length; j ++ ) {
const target = targets[ j ];
Object.keys( target ).forEach( ( attribute ) => {
const accessor = this.parseAccessor( target[ attribute ] );
if ( accessor ) {
let attribName;
switch ( attribute ) {
case 'POSITION':
attribName = GLTFLoader.MORPH_POSITION_PREFIX + j;
hasPositions = true;
break;
case 'NORMAL':
attribName = GLTFLoader.MORPH_NORMAL_PREFIX + j;
hasNormals = true;
break;
case 'TANGENT':
attribName = GLTFLoader.MORPH_TANGENT_PREFIX + j;
hasTangents = true;
break;
default:
attribName = false;
}
if ( ! attribName )
console.error( `glTF has unsupported morph target attribute ${attribute}` );
else
dprimitive.attribArrays[ attribName ] = accessor;
}
} );
}
if ( hasPositions ) dprimitive.defines.push( GLTFLoader.getMorphtargetPositionDefine() );
if ( hasNormals ) dprimitive.defines.push( GLTFLoader.getMorphtargetNormalDefine() );
if ( hasTangents ) dprimitive.defines.push( GLTFLoader.getMorphtargetTangentDefine() );
dprimitive.weights = mesh.weights || new Array( targets.length ).fill( 0 );
}
dprimitives.push( dprimitive );
}
mesh.dprimitives = dprimitives;
mesh.isParsed = true;
return mesh.dprimitives;
},
parseAccessor( accessorId ) {
const accessor = this.gltf.accessors[ accessorId ];
if ( ! accessor )
return errorMiss( 'accessor', accessorId );
if ( accessor.isParsed )
return accessor.daccessor;
accessor.isParsed = true;
accessor.daccessor = false;
const normalize = !! accessor.normalized;
const bufferView = this.gltf.bufferViews[ accessor.bufferView ];
const byteStride = bufferView && bufferView.byteStride;
const arrayType = getTypedArrayTypeFromGLType( accessor.componentType );
let numComponents = 1;
switch ( accessor.type ) {
case 'SCALAR':
numComponents = 1;
break;
case 'VEC2':
numComponents = 2;
break;
case 'VEC3':
numComponents = 3;
break;
case 'VEC4':
case 'MAT2':
numComponents = 4;
break;
case 'MAT3':
numComponents = 9;
break;
case 'MAT4':
numComponents = 16;
break;
default:
numComponents = 0;
break;
}
if ( numComponents === 0 ) {
console.error( `glTF has unknown data type in accessor: ${accessor.type}` );
return false;
}
const componentsBytes = numComponents * arrayType.BYTES_PER_ELEMENT;
let buffer;
if ( bufferView !== undefined ) {
buffer = this.parseBufferView( accessor.bufferView );
if ( ! buffer )
return accessor.daccessor;
} else
buffer = ( new Uint8Array( componentsBytes * accessor.count ) ).buffer;
let typedArray = this.getTypedArrayFromArrayBuffer( buffer, byteStride, accessor.byteOffset || 0, arrayType, numComponents, accessor.count );
if ( accessor.sparse ) {
const { count, indices, values } = accessor.sparse;
typedArray = new arrayType( typedArray ); // eslint-disable-line
const indicesByteOffset = indices.byteOffset || 0;
const indicesBufferView = this.gltf.bufferViews[ indices.bufferView ];
const indicesArrayType = getTypedArrayTypeFromGLType( indices.componentType );
const indicesBuffer = this.parseBufferView( indices.bufferView );
const indicesArray = this.getTypedArrayFromArrayBuffer( indicesBuffer, indicesBufferView.byteStride, indicesByteOffset, indicesArrayType, 1, count );
const valuesByteOffset = values.byteOffset || 0;
const valuesBufferView = this.gltf.bufferViews[ values.bufferView ];
const valuesBuffer = this.parseBufferView( values.bufferView );