import {
	AmbientLight,
	AnimationClip,
	Bone,
	BufferGeometry,
	ClampToEdgeWrapping,
	Color,
	DirectionalLight,
	EquirectangularReflectionMapping,
	Euler,
	FileLoader,
	Float32BufferAttribute,
	Group,
	Line,
	LineBasicMaterial,
	Loader,
	LoaderUtils,
	MathUtils,
	Matrix3,
	Matrix4,
	Mesh,
	MeshLambertMaterial,
	MeshPhongMaterial,
	NumberKeyframeTrack,
	Object3D,
	OrthographicCamera,
	PerspectiveCamera,
	PointLight,
	PropertyBinding,
	Quaternion,
	QuaternionKeyframeTrack,
	RepeatWrapping,
	Skeleton,
	SkinnedMesh,
	SpotLight,
	Texture,
	TextureLoader,
	Uint16BufferAttribute,
	Vector3,
	Vector4,
	VectorKeyframeTrack,
	sRGBEncoding
} from '../../../build/three.module.js';
import * as fflate from '../libs/fflate.module.js';
import { NURBSCurve } from '../curves/NURBSCurve.js';

/**
 * Loader loads FBX file and generates Group representing FBX scene.
 * Requires FBX file to be >= 7.0 and in ASCII or >= 6400 in Binary format
 * Versions lower than this may load but will probably have errors
 *
 * Needs Support:
 *  Morph normals / blend shape normals
 *
 * FBX format references:
 * 	https://wiki.blender.org/index.php/User:Mont29/Foundation/FBX_File_Structure
 * 	http://help.autodesk.com/view/FBX/2017/ENU/?guid=__cpp_ref_index_html (C++ SDK reference)
 *
 * 	Binary format specification:
 *		https://code.blender.org/2013/08/fbx-binary-file-format-specification/
 */


let fbxTree;
let connections;
let sceneGraph;

class FBXLoader extends Loader {

	constructor( manager ) {

		super( manager );

	}

	load( url, onLoad, onProgress, onError ) {

		const scope = this;

		const path = ( scope.path === '' ) ? LoaderUtils.extractUrlBase( url ) : scope.path;

		const loader = new FileLoader( this.manager );
		loader.setPath( scope.path );
		loader.setResponseType( 'arraybuffer' );
		loader.setRequestHeader( scope.requestHeader );
		loader.setWithCredentials( scope.withCredentials );

		loader.load( url, function ( buffer ) {

			try {

				onLoad( scope.parse( buffer, path ) );

			} catch ( e ) {

				if ( onError ) {

					onError( e );

				} else {

					console.error( e );

				}

				scope.manager.itemError( url );

			}

		}, onProgress, onError );

	}

	parse( FBXBuffer, path ) {

		if ( isFbxFormatBinary( FBXBuffer ) ) {

			fbxTree = new BinaryParser().parse( FBXBuffer );

		} else {

			const FBXText = convertArrayBufferToString( FBXBuffer );

			if ( ! isFbxFormatASCII( FBXText ) ) {

				throw new Error( 'THREE.FBXLoader: Unknown format.' );

			}

			if ( getFbxVersion( FBXText ) < 7000 ) {

				throw new Error( 'THREE.FBXLoader: FBX version not supported, FileVersion: ' + getFbxVersion( FBXText ) );

			}

			fbxTree = new TextParser().parse( FBXText );

		}

		// console.log( fbxTree );

		const textureLoader = new TextureLoader( this.manager ).setPath( this.resourcePath || path ).setCrossOrigin( this.crossOrigin );

		return new FBXTreeParser( textureLoader, this.manager ).parse( fbxTree );

	}

}

// Parse the FBXTree object returned by the BinaryParser or TextParser and return a Group
class FBXTreeParser {

	constructor( textureLoader, manager ) {

		this.textureLoader = textureLoader;
		this.manager = manager;

	}

	parse() {

		connections = this.parseConnections();

		const images = this.parseImages();
		const textures = this.parseTextures( images );
		const materials = this.parseMaterials( textures );
		const deformers = this.parseDeformers();
		const geometryMap = new GeometryParser().parse( deformers );

		this.parseScene( deformers, geometryMap, materials );

		return sceneGraph;

	}

	// Parses FBXTree.Connections which holds parent-child connections between objects (e.g. material -> texture, model->geometry )
	// and details the connection type
	parseConnections() {

		const connectionMap = new Map();

		if ( 'Connections' in fbxTree ) {

			const rawConnections = fbxTree.Connections.connections;

			rawConnections.forEach( function ( rawConnection ) {

				const fromID = rawConnection[ 0 ];
				const toID = rawConnection[ 1 ];
				const relationship = rawConnection[ 2 ];

				if ( ! connectionMap.has( fromID ) ) {

					connectionMap.set( fromID, {
						parents: [],
						children: []
					} );

				}

				const parentRelationship = { ID: toID, relationship: relationship };
				connectionMap.get( fromID ).parents.push( parentRelationship );

				if ( ! connectionMap.has( toID ) ) {

					connectionMap.set( toID, {
						parents: [],
						children: []
					} );

				}

				const childRelationship = { ID: fromID, relationship: relationship };
				connectionMap.get( toID ).children.push( childRelationship );

			} );

		}

		return connectionMap;

	}

	// Parse FBXTree.Objects.Video for embedded image data
	// These images are connected to textures in FBXTree.Objects.Textures
	// via FBXTree.Connections.
	parseImages() {

		const images = {};
		const blobs = {};

		if ( 'Video' in fbxTree.Objects ) {

			const videoNodes = fbxTree.Objects.Video;

			for ( const nodeID in videoNodes ) {

				const videoNode = videoNodes[ nodeID ];

				const id = parseInt( nodeID );

				images[ id ] = videoNode.RelativeFilename || videoNode.Filename;

				// raw image data is in videoNode.Content
				if ( 'Content' in videoNode ) {

					const arrayBufferContent = ( videoNode.Content instanceof ArrayBuffer ) && ( videoNode.Content.byteLength > 0 );
					const base64Content = ( typeof videoNode.Content === 'string' ) && ( videoNode.Content !== '' );

					if ( arrayBufferContent || base64Content ) {

						const image = this.parseImage( videoNodes[ nodeID ] );

						blobs[ videoNode.RelativeFilename || videoNode.Filename ] = image;

					}

				}

			}

		}

		for ( const id in images ) {

			const filename = images[ id ];

			if ( blobs[ filename ] !== undefined ) images[ id ] = blobs[ filename ];
			else images[ id ] = images[ id ].split( '\\' ).pop();

		}

		return images;

	}

	// Parse embedded image data in FBXTree.Video.Content
	parseImage( videoNode ) {

		const content = videoNode.Content;
		const fileName = videoNode.RelativeFilename || videoNode.Filename;
		const extension = fileName.slice( fileName.lastIndexOf( '.' ) + 1 ).toLowerCase();

		let type;

		switch ( extension ) {

			case 'bmp':

				type = 'image/bmp';
				break;

			case 'jpg':
			case 'jpeg':

				type = 'image/jpeg';
				break;

			case 'png':

				type = 'image/png';
				break;

			case 'tif':

				type = 'image/tiff';
				break;

			case 'tga':

				if ( this.manager.getHandler( '.tga' ) === null ) {

					console.warn( 'FBXLoader: TGA loader not found, skipping ', fileName );

				}

				type = 'image/tga';
				break;

			default:

				console.warn( 'FBXLoader: Image type "' + extension + '" is not supported.' );
				return;

		}

		if ( typeof content === 'string' ) { // ASCII format

			return 'data:' + type + ';base64,' + content;

		} else { // Binary Format

			const array = new Uint8Array( content );
			return window.URL.createObjectURL( new Blob( [ array ], { type: type } ) );

		}

	}

	// Parse nodes in FBXTree.Objects.Texture
	// These contain details such as UV scaling, cropping, rotation etc and are connected
	// to images in FBXTree.Objects.Video
	parseTextures( images ) {

		const textureMap = new Map();

		if ( 'Texture' in fbxTree.Objects ) {

			const textureNodes = fbxTree.Objects.Texture;
			for ( const nodeID in textureNodes ) {

				const texture = this.parseTexture( textureNodes[ nodeID ], images );
				textureMap.set( parseInt( nodeID ), texture );

			}

		}

		return textureMap;

	}

	// Parse individual node in FBXTree.Objects.Texture
	parseTexture( textureNode, images ) {

		const texture = this.loadTexture( textureNode, images );

		texture.ID = textureNode.id;

		texture.name = textureNode.attrName;

		const wrapModeU = textureNode.WrapModeU;
		const wrapModeV = textureNode.WrapModeV;

		const valueU = wrapModeU !== undefined ? wrapModeU.value : 0;
		const valueV = wrapModeV !== undefined ? wrapModeV.value : 0;

		// http://download.autodesk.com/us/fbx/SDKdocs/FBX_SDK_Help/files/fbxsdkref/class_k_fbx_texture.html#889640e63e2e681259ea81061b85143a
		// 0: repeat(default), 1: clamp

		texture.wrapS = valueU === 0 ? RepeatWrapping : ClampToEdgeWrapping;
		texture.wrapT = valueV === 0 ? RepeatWrapping : ClampToEdgeWrapping;

		if ( 'Scaling' in textureNode ) {

			const values = textureNode.Scaling.value;

			texture.repeat.x = values[ 0 ];
			texture.repeat.y = values[ 1 ];

		}

		return texture;

	}

	// load a texture specified as a blob or data URI, or via an external URL using TextureLoader
	loadTexture( textureNode, images ) {

		let fileName;

		const currentPath = this.textureLoader.path;

		const children = connections.get( textureNode.id ).children;

		if ( children !== undefined && children.length > 0 && images[ children[ 0 ].ID ] !== undefined ) {

			fileName = images[ children[ 0 ].ID ];

			if ( fileName.indexOf( 'blob:' ) === 0 || fileName.indexOf( 'data:' ) === 0 ) {

				this.textureLoader.setPath( undefined );

			}

		}

		let texture;

		const extension = textureNode.FileName.slice( - 3 ).toLowerCase();

		if ( extension === 'tga' ) {

			const loader = this.manager.getHandler( '.tga' );

			if ( loader === null ) {

				console.warn( 'FBXLoader: TGA loader not found, creating placeholder texture for', textureNode.RelativeFilename );
				texture = new Texture();

			} else {

				loader.setPath( this.textureLoader.path );
				texture = loader.load( fileName );

			}

		} else if ( extension === 'psd' ) {

			console.warn( 'FBXLoader: PSD textures are not supported, creating placeholder texture for', textureNode.RelativeFilename );
			texture = new Texture();

		} else {

			texture = this.textureLoader.load( fileName );

		}

		this.textureLoader.setPath( currentPath );

		return texture;

	}

	// Parse nodes in FBXTree.Objects.Material
	parseMaterials( textureMap ) {

		const materialMap = new Map();

		if ( 'Material' in fbxTree.Objects ) {

			const materialNodes = fbxTree.Objects.Material;

			for ( const nodeID in materialNodes ) {

				const material = this.parseMaterial( materialNodes[ nodeID ], textureMap );

				if ( material !== null ) materialMap.set( parseInt( nodeID ), material );

			}

		}

		return materialMap;

	}

	// Parse single node in FBXTree.Objects.Material
	// Materials are connected to texture maps in FBXTree.Objects.Textures
	// FBX format currently only supports Lambert and Phong shading models
	parseMaterial( materialNode, textureMap ) {

		const ID = materialNode.id;
		const name = materialNode.attrName;
		let type = materialNode.ShadingModel;

		// Case where FBX wraps shading model in property object.
		if ( typeof type === 'object' ) {

			type = type.value;

		}

		// Ignore unused materials which don't have any connections.
		if ( ! connections.has( ID ) ) return null;

		const parameters = this.parseParameters( materialNode, textureMap, ID );

		let material;

		switch ( type.toLowerCase() ) {

			case 'phong':
				material = new MeshPhongMaterial();
				break;
			case 'lambert':
				material = new MeshLambertMaterial();
				break;
			default:
				console.warn( 'THREE.FBXLoader: unknown material type "%s". Defaulting to MeshPhongMaterial.', type );
				material = new MeshPhongMaterial();
				break;

		}

		material.setValues( parameters );
		material.name = name;

		return material;

	}

	// Parse FBX material and return parameters suitable for a three.js material
	// Also parse the texture map and return any textures associated with the material
	parseParameters( materialNode, textureMap, ID ) {

		const parameters = {};

		if ( materialNode.BumpFactor ) {

			parameters.bumpScale = materialNode.BumpFactor.value;

		}

		if ( materialNode.Diffuse ) {

			parameters.color = new Color().fromArray( materialNode.Diffuse.value );

		} else if ( materialNode.DiffuseColor && ( materialNode.DiffuseColor.type === 'Color' || materialNode.DiffuseColor.type === 'ColorRGB' ) ) {

			// The blender exporter exports diffuse here instead of in materialNode.Diffuse
			parameters.color = new Color().fromArray( materialNode.DiffuseColor.value );

		}

		if ( materialNode.DisplacementFactor ) {

			parameters.displacementScale = materialNode.DisplacementFactor.value;

		}

		if ( materialNode.Emissive ) {

			parameters.emissive = new Color().fromArray( materialNode.Emissive.value );

		} else if ( materialNode.EmissiveColor && ( materialNode.EmissiveColor.type === 'Color' || materialNode.EmissiveColor.type === 'ColorRGB' ) ) {

			// The blender exporter exports emissive color here instead of in materialNode.Emissive
			parameters.emissive = new Color().fromArray( materialNode.EmissiveColor.value );

		}

		if ( materialNode.EmissiveFactor ) {

			parameters.emissiveIntensity = parseFloat( materialNode.EmissiveFactor.value );

		}

		if ( materialNode.Opacity ) {

			parameters.opacity = parseFloat( materialNode.Opacity.value );

		}

		if ( parameters.opacity < 1.0 ) {

			parameters.transparent = true;

		}

		if ( materialNode.ReflectionFactor ) {

			parameters.reflectivity = materialNode.ReflectionFactor.value;

		}

		if ( materialNode.Shininess ) {

			parameters.shininess = materialNode.Shininess.value;

		}

		if ( materialNode.Specular ) {

			parameters.specular = new Color().fromArray( materialNode.Specular.value );

		} else if ( materialNode.SpecularColor && materialNode.SpecularColor.type === 'Color' ) {

			// The blender exporter exports specular color here instead of in materialNode.Specular
			parameters.specular = new Color().fromArray( materialNode.SpecularColor.value );

		}

		const scope = this;
		connections.get( ID ).children.forEach( function ( child ) {

			const type = child.relationship;

			switch ( type ) {

				case 'Bump':
					parameters.bumpMap = scope.getTexture( textureMap, child.ID );
					break;

				case 'Maya|TEX_ao_map':
					parameters.aoMap = scope.getTexture( textureMap, child.ID );
					break;

				case 'DiffuseColor':
				case 'Maya|TEX_color_map':
					parameters.map = scope.getTexture( textureMap, child.ID );
					if ( parameters.map !== undefined ) {

						parameters.map.encoding = sRGBEncoding;

					}

					break;

				case 'DisplacementColor':
					parameters.displacementMap = scope.getTexture( textureMap, child.ID );
					break;

				case 'EmissiveColor':
					parameters.emissiveMap = scope.getTexture( textureMap, child.ID );
					if ( parameters.emissiveMap !== undefined ) {

						parameters.emissiveMap.encoding = sRGBEncoding;

					}

					break;

				case 'NormalMap':
				case 'Maya|TEX_normal_map':
					parameters.normalMap = scope.getTexture( textureMap, child.ID );
					break;

				case 'ReflectionColor':
					parameters.envMap = scope.getTexture( textureMap, child.ID );
					if ( parameters.envMap !== undefined ) {

						parameters.envMap.mapping = EquirectangularReflectionMapping;
						parameters.envMap.encoding = sRGBEncoding;

					}

					break;

				case 'SpecularColor':
					parameters.specularMap = scope.getTexture( textureMap, child.ID );
					if ( parameters.specularMap !== undefined ) {

						parameters.specularMap.encoding = sRGBEncoding;

					}

					break;

				case 'TransparentColor':
				case 'TransparencyFactor':
					parameters.alphaMap = scope.getTexture( textureMap, child.ID );
					parameters.transparent = true;
					break;

				case 'AmbientColor':
				case 'ShininessExponent': // AKA glossiness map
				case 'SpecularFactor': // AKA specularLevel
				case 'VectorDisplacementColor': // NOTE: Seems to be a copy of DisplacementColor
				default:
					console.warn( 'THREE.FBXLoader: %s map is not supported in three.js, skipping texture.', type );
					break;

			}

		} );

		return parameters;

	}

	// get a texture from the textureMap for use by a material.
	getTexture( textureMap, id ) {

		// if the texture is a layered texture, just use the first layer and issue a warning
		if ( 'LayeredTexture' in fbxTree.Objects && id in fbxTree.Objects.LayeredTexture ) {

			console.warn( 'THREE.FBXLoader: layered textures are not supported in three.js. Discarding all but first layer.' );
			id = connections.get( id ).children[ 0 ].ID;

		}

		return textureMap.get( id );

	}

	// Parse nodes in FBXTree.Objects.Deformer
	// Deformer node can contain skinning or Vertex Cache animation data, however only skinning is supported here
	// Generates map of Skeleton-like objects for use later when generating and binding skeletons.
	parseDeformers() {

		const skeletons = {};
		const morphTargets = {};

		if ( 'Deformer' in fbxTree.Objects ) {

			const DeformerNodes = fbxTree.Objects.Deformer;

			for ( const nodeID in DeformerNodes ) {

				const deformerNode = DeformerNodes[ nodeID ];

				const relationships = connections.get( parseInt( nodeID ) );

				if ( deformerNode.attrType === 'Skin' ) {

					const skeleton = this.parseSkeleton( relationships, DeformerNodes );
					skeleton.ID = nodeID;

					if ( relationships.parents.length > 1 ) console.warn( 'THREE.FBXLoader: skeleton attached to more than one geometry is not supported.' );
					skeleton.geometryID = relationships.parents[ 0 ].ID;

					skeletons[ nodeID ] = skeleton;

				} else if ( deformerNode.attrType === 'BlendShape' ) {

					const morphTarget = {
						id: nodeID,
					};

					morphTarget.rawTargets = this.parseMorphTargets( relationships, DeformerNodes );
					morphTarget.id = nodeID;

					if ( relationships.parents.length > 1 ) console.warn( 'THREE.FBXLoader: morph target attached to more than one geometry is not supported.' );

					morphTargets[ nodeID ] = morphTarget;

				}

			}

		}

		return {

			skeletons: skeletons,
			morphTargets: morphTargets,

		};

	}

	// Parse single nodes in FBXTree.Objects.Deformer
	// The top level skeleton node has type 'Skin' and sub nodes have type 'Cluster'
	// Each skin node represents a skeleton and each cluster node represents a bone
	parseSkeleton( relationships, deformerNodes ) {

		const rawBones = [];

		relationships.children.forEach( function ( child ) {

			const boneNode = deformerNodes[ child.ID ];

			if ( boneNode.attrType !== 'Cluster' ) return;

			const rawBone = {

				ID: child.ID,
				indices: [],
				weights: [],
				transformLink: new Matrix4().fromArray( boneNode.TransformLink.a ),
				// transform: new Matrix4().fromArray( boneNode.Transform.a ),
				// linkMode: boneNode.Mode,

			};

			if ( 'Indexes' in boneNode ) {

				rawBone.indices = boneNode.Indexes.a;
				rawBone.weights = boneNode.Weights.a;

			}

			rawBones.push( rawBone );

		} );

		return {

			rawBones: rawBones,
			bones: []

		};

	}

	// The top level morph deformer node has type "BlendShape" and sub nodes have type "BlendShapeChannel"
	parseMorphTargets( relationships, deformerNodes ) {

		const rawMorphTargets = [];

		for ( let i = 0; i < relationships.children.length; i ++ ) {

			const child = relationships.children[ i ];

			const morphTargetNode = deformerNodes[ child.ID ];

			const rawMorphTarget = {

				name: morphTargetNode.attrName,
				initialWeight: morphTargetNode.DeformPercent,
				id: morphTargetNode.id,
				fullWeights: morphTargetNode.FullWeights.a

			};

			if ( morphTargetNode.attrType !== 'BlendShapeChannel' ) return;

			rawMorphTarget.geoID = connections.get( parseInt( child.ID ) ).children.filter( function ( child ) {

				return child.relationship === undefined;

			} )[ 0 ].ID;

			rawMorphTargets.push( rawMorphTarget );

		}

		return rawMorphTargets;

	}

	// create the main Group() to be returned by the loader
	parseScene( deformers, geometryMap, materialMap ) {

		sceneGraph = new Group();

		const modelMap = this.parseModels( deformers.skeletons, geometryMap, materialMap );

		const modelNodes = fbxTree.Objects.Model;

		const scope = this;
		modelMap.forEach( function ( model ) {

			const modelNode = modelNodes[ model.ID ];
			scope.setLookAtProperties( model, modelNode );

			const parentConnections = connections.get( model.ID ).parents;

			parentConnections.forEach( function ( connection ) {

				const parent = modelMap.get( connection.ID );
				if ( parent !== undefined ) parent.add( model );

			} );

			if ( model.parent === null ) {

				sceneGraph.add( model );

			}


		} );

		this.bindSkeleton( deformers.skeletons, geometryMap, modelMap );

		this.createAmbientLight();

		sceneGraph.traverse( function ( node ) {

			if ( node.userData.transformData ) {

				if ( node.parent ) {

					node.userData.transformData.parentMatrix = node.parent.matrix;
					node.userData.transformData.parentMatrixWorld = node.parent.matrixWorld;

				}

				const transform = generateTransform( node.userData.transformData );

				node.applyMatrix4( transform );
				node.updateWorldMatrix();

			}

		} );

		const animations = new AnimationParser().parse();

		// if all the models where already combined in a single group, just return that
		if ( sceneGraph.children.length === 1 && sceneGraph.children[ 0 ].isGroup ) {

			sceneGraph.children[ 0 ].animations = animations;
			sceneGraph = sceneGraph.children[ 0 ];

		}

		sceneGraph.animations = animations;

	}

	// parse nodes in FBXTree.Objects.Model
	parseModels( skeletons, geometryMap, materialMap ) {

		const modelMap = new Map();
		const modelNodes = fbxTree.Objects.Model;

		for ( const nodeID in modelNodes ) {

			const id = parseInt( nodeID );
			const node = modelNodes[ nodeID ];
			const relationships = connections.get( id );

			let model = this.buildSkeleton( relationships, skeletons, id, node.attrName );

			if ( ! model ) {

				switch ( node.attrType ) {

					case 'Camera':
						model = this.createCamera( relationships );
						break;
					case 'Light':
						model = this.createLight( relationships );
						break;
					case 'Mesh':
						model = this.createMesh( relationships, geometryMap, materialMap );
						break;
					case 'NurbsCurve':
						model = this.createCurve( relationships, geometryMap );
						break;
					case 'LimbNode':
					case 'Root':
						model = new Bone();
						break;
					case 'Null':
					default:
						model = new Group();
						break;

				}

				model.name = node.attrName ? PropertyBinding.sanitizeNodeName( node.attrName ) : '';

				model.ID = id;

			}

			this.getTransformData( model, node );
			modelMap.set( id, model );

		}

		return modelMap;

	}

	buildSkeleton( relationships, skeletons, id, name ) {

		let bone = null;

		relationships.parents.forEach( function ( parent ) {

			for ( const ID in skeletons ) {

				const skeleton = skeletons[ ID ];

				skeleton.rawBones.forEach( function ( rawBone, i ) {

					if ( rawBone.ID === parent.ID ) {

						const subBone = bone;
						bone = new Bone();

						bone.matrixWorld.copy( rawBone.transformLink );

						// set name and id here - otherwise in cases where "subBone" is created it will not have a name / id

						bone.name = name ? PropertyBinding.sanitizeNodeName( name ) : '';
						bone.ID = id;

						skeleton.bones[ i ] = bone;

						// In cases where a bone is shared between multiple meshes
						// duplicate the bone here and and it as a child of the first bone
						if ( subBone !== null ) {

							bone.add( subBone );

						}

					}

				} );

			}

		} );

		return bone;

	}

	// create a PerspectiveCamera or OrthographicCamera
	createCamera( relationships ) {

		let model;
		let cameraAttribute;

		relationships.children.forEach( function ( child ) {

			const attr = fbxTree.Objects.NodeAttribute[ child.ID ];

			if ( attr !== undefined ) {

				cameraAttribute = attr;

			}

		} );

		if ( cameraAttribute === undefined ) {

			model = new Object3D();

		} else {

			let type = 0;
			if ( cameraAttribute.CameraProjectionType !== undefined && cameraAttribute.CameraProjectionType.value === 1 ) {

				type = 1;

			}

			let nearClippingPlane = 1;
			if ( cameraAttribute.NearPlane !== undefined ) {

				nearClippingPlane = cameraAttribute.NearPlane.value / 1000;

			}

			let farClippingPlane = 1000;
			if ( cameraAttribute.FarPlane !== undefined ) {

				farClippingPlane = cameraAttribute.FarPlane.value / 1000;

			}


			let width = window.innerWidth;
			let height = window.innerHeight;

			if ( cameraAttribute.AspectWidth !== undefined && cameraAttribute.AspectHeight !== undefined ) {

				width = cameraAttribute.AspectWidth.value;
				height = cameraAttribute.AspectHeight.value;

			}

			const aspect = width / height;

			let fov = 45;
			if ( cameraAttribute.FieldOfView !== undefined ) {

				fov = cameraAttribute.FieldOfView.value;

			}

			const focalLength = cameraAttribute.FocalLength ? cameraAttribute.FocalLength.value : null;

			switch ( type ) {

				case 0: // Perspective
					model = new PerspectiveCamera( fov, aspect, nearClippingPlane, farClippingPlane );
					if ( focalLength !== null ) model.setFocalLength( focalLength );
					break;

				case 1: // Orthographic
					model = new OrthographicCamera( - width / 2, width / 2, height / 2, - height / 2, nearClippingPlane, farClippingPlane );
					break;

				default:
					console.warn( 'THREE.FBXLoader: Unknown camera type ' + type + '.' );
					model = new Object3D();
					break;

			}

		}

		return model;

	}

	// Create a DirectionalLight, PointLight or SpotLight
	createLight( relationships ) {

		let model;
		let lightAttribute;

		relationships.children.forEach( function ( child ) {

			const attr = fbxTree.Objects.NodeAttribute[ child.ID ];

			if ( attr !== undefined ) {

				lightAttribute = attr;

			}

		} );

		if ( lightAttribute === undefined ) {

			model = new Object3D();

		} else {

			let type;

			// LightType can be undefined for Point lights
			if ( lightAttribute.LightType === undefined ) {

				type = 0;

			} else {

				type = lightAttribute.LightType.value;

			}

			let color = 0xffffff;

			if ( lightAttribute.Color !== undefined ) {

				color = new Color().fromArray( lightAttribute.Color.value );

			}

			let intensity = ( lightAttribute.Intensity === undefined ) ? 1 : lightAttribute.Intensity.value / 100;

			// light disabled
			if ( lightAttribute.CastLightOnObject !== undefined && lightAttribute.CastLightOnObject.value === 0 ) {

				intensity = 0;

			}

			let distance = 0;
			if ( lightAttribute.FarAttenuationEnd !== undefined ) {

				if ( lightAttribute.EnableFarAttenuation !== undefined && lightAttribute.EnableFarAttenuation.value === 0 ) {

					distance = 0;

				} else {

					distance = lightAttribute.FarAttenuationEnd.value;

				}

			}

			// TODO: could this be calculated linearly from FarAttenuationStart to FarAttenuationEnd?
			const decay = 1;

			switch ( type ) {

				case 0: // Point
					model = new PointLight( color, intensity, distance, decay );
					break;

				case 1: // Directional
					model = new DirectionalLight( color, intensity );
					break;

				case 2: // Spot
					let angle = Math.PI / 3;

					if ( lightAttribute.InnerAngle !== undefined ) {

						angle = MathUtils.degToRad( lightAttribute.InnerAngle.value );

					}

					let penumbra = 0;
					if ( lightAttribute.OuterAngle !== undefined ) {

						// TODO: this is not correct - FBX calculates outer and inner angle in degrees
						// with OuterAngle > InnerAngle && OuterAngle <= Math.PI
						// while three.js uses a penumbra between (0, 1) to attenuate the inner angle
						penumbra = MathUtils.degToRad( lightAttribute.OuterAngle.value );
						penumbra = Math.max( penumbra, 1 );

					}

					model = new SpotLight( color, intensity, distance, angle, penumbra, decay );
					break;

				default:
					console.warn( 'THREE.FBXLoader: Unknown light type ' + lightAttribute.LightType.value + ', defaulting to a PointLight.' );
					model = new PointLight( color, intensity );
					break;

			}

			if ( lightAttribute.CastShadows !== undefined && lightAttribute.CastShadows.value === 1 ) {

				model.castShadow = true;

			}

		}

		return model;

	}

	createMesh( relationships, geometryMap, materialMap ) {

		let model;
		let geometry = null;
		let material = null;
		const materials = [];

		// get geometry and materials(s) from connections
		relationships.children.forEach( function ( child ) {

			if ( geometryMap.has( child.ID ) ) {

				geometry = geometryMap.get( child.ID );

			}

			if ( materialMap.has( child.ID ) ) {

				materials.push( materialMap.get( child.ID ) );

			}

		} );

		if ( materials.length > 1 ) {

			material = materials;

		} else if ( materials.length > 0 ) {

			material = materials[ 0 ];

		} else {

			material = new MeshPhongMaterial( { color: 0xcccccc } );
			materials.push( material );

		}

		if ( 'color' in geometry.attributes ) {

			materials.forEach( function ( material ) {

				material.vertexColors = true;

			} );

		}

		if ( geometry.FBX_Deformer ) {

			model = new SkinnedMesh( geometry, material );
			model.normalizeSkinWeights();

		} else {

			model = new Mesh( geometry, material );

		}

		return model;

	}

	createCurve( relationships, geometryMap ) {

		const geometry = relationships.children.reduce( function ( geo, child ) {

			if ( geometryMap.has( child.ID ) ) geo = geometryMap.get( child.ID );

			return geo;

		}, null );

		// FBX does not list materials for Nurbs lines, so we'll just put our own in here.
		const material = new LineBasicMaterial( { color: 0x3300ff, linewidth: 1 } );
		return new Line( geometry, material );

	}

	// parse the model node for transform data
	getTransformData( model, modelNode ) {

		const transformData = {};

		if ( 'InheritType' in modelNode ) transformData.inheritType = parseInt( modelNode.InheritType.value );

		if ( 'RotationOrder' in modelNode ) transformData.eulerOrder = getEulerOrder( modelNode.RotationOrder.value );
		else transformData.eulerOrder = 'ZYX';

		if ( 'Lcl_Translation' in modelNode ) transformData.translation = modelNode.Lcl_Translation.value;

		if ( 'PreRotation' in modelNode ) transformData.preRotation = modelNode.PreRotation.value;
		if ( 'Lcl_Rotation' in modelNode ) transformData.rotation = modelNode.Lcl_Rotation.value;
		if ( 'PostRotation' in modelNode ) transformData.postRotation = modelNode.PostRotation.value;

		if ( 'Lcl_Scaling' in modelNode ) transformData.scale = modelNode.Lcl_Scaling.value;

		if ( 'ScalingOffset' in modelNode ) transformData.scalingOffset = modelNode.ScalingOffset.value;
		if ( 'ScalingPivot' in modelNode ) transformData.scalingPivot = modelNode.ScalingPivot.value;

		if ( 'RotationOffset' in modelNode ) transformData.rotationOffset = modelNode.RotationOffset.value;
		if ( 'RotationPivot' in modelNode ) transformData.rotationPivot = modelNode.RotationPivot.value;

		model.userData.transformData = transformData;

	}

	setLookAtProperties( model, modelNode ) {

		if ( 'LookAtProperty' in modelNode ) {

			const children = connections.get( model.ID ).children;

			children.forEach( function ( child ) {

				if ( child.relationship === 'LookAtProperty' ) {

					const lookAtTarget = fbxTree.Objects.Model[ child.ID ];

					if ( 'Lcl_Translation' in lookAtTarget ) {

						const pos = lookAtTarget.Lcl_Translation.value;

						// DirectionalLight, SpotLight
						if ( model.target !== undefined ) {

							model.target.position.fromArray( pos );
							sceneGraph.add( model.target );

						} else { // Cameras and other Object3Ds

							model.lookAt( new Vector3().fromArray( pos ) );

						}

					}

				}

			} );

		}

	}

	bindSkeleton( skeletons, geometryMap, modelMap ) {

		const bindMatrices = this.parsePoseNodes();

		for ( const ID in skeletons ) {

			const skeleton = skeletons[ ID ];

			const parents = connections.get( parseInt( skeleton.ID ) ).parents;

			parents.forEach( function ( parent ) {

				if ( geometryMap.has( parent.ID ) ) {

					const geoID = parent.ID;
					const geoRelationships = connections.get( geoID );

					geoRelationships.parents.forEach( function ( geoConnParent ) {

						if ( modelMap.has( geoConnParent.ID ) ) {

							const model = modelMap.get( geoConnParent.ID );

							model.bind( new Skeleton( skeleton.bones ), bindMatrices[ geoConnParent.ID ] );

						}

					} );

				}

			} );

		}

	}

	parsePoseNodes() {

		const bindMatrices = {};

		if ( 'Pose' in fbxTree.Objects ) {

			const BindPoseNode = fbxTree.Objects.Pose;

			for ( const nodeID in BindPoseNode ) {

				if ( BindPoseNode[ nodeID ].attrType === 'BindPose' && BindPoseNode[ nodeID ].NbPoseNodes > 0 ) {

					const poseNodes = BindPoseNode[ nodeID ].PoseNode;

					if ( Array.isArray( poseNodes ) ) {

						poseNodes.forEach( function ( poseNode ) {

							bindMatrices[ poseNode.Node ] = new Matrix4().fromArray( poseNode.Matrix.a );

						} );

					} else {

						bindMatrices[ poseNodes.Node ] = new Matrix4().fromArray( poseNodes.Matrix.a );

					}

				}

			}

		}

		return bindMatrices;

	}

	// Parse ambient color in FBXTree.GlobalSettings - if it's not set to black (default), create an ambient light
	createAmbientLight() {

		if ( 'GlobalSettings' in fbxTree && 'AmbientColor' in fbxTree.GlobalSettings ) {

			const ambientColor = fbxTree.GlobalSettings.AmbientColor.value;
			const r = ambientColor[ 0 ];
			const g = ambientColor[ 1 ];
			const b = ambientColor[ 2 ];

			if ( r !== 0 || g !== 0 || b !== 0 ) {

				const color = new Color( r, g, b );
				sceneGraph.add( new AmbientLight( color, 1 ) );

			}

		}

	}

}

// parse Geometry data from FBXTree and return map of BufferGeometries
class GeometryParser {

	// Parse nodes in FBXTree.Objects.Geometry
	parse( deformers ) {

		const geometryMap = new Map();

		if ( 'Geometry' in fbxTree.Objects ) {

			const geoNodes = fbxTree.Objects.Geometry;

			for ( const nodeID in geoNodes ) {

				const relationships = connections.get( parseInt( nodeID ) );
				const geo = this.parseGeometry( relationships, geoNodes[ nodeID ], deformers );

				geometryMap.set( parseInt( nodeID ), geo );

			}

		}

		return geometryMap;

	}

	// Parse single node in FBXTree.Objects.Geometry
	parseGeometry( relationships, geoNode, deformers ) {

		switch ( geoNode.attrType ) {

			case 'Mesh':
				return this.parseMeshGeometry( relationships, geoNode, deformers );
				break;

			case 'NurbsCurve':
				return this.parseNurbsGeometry( geoNode );
				break;

		}

	}

	// Parse single node mesh geometry in FBXTree.Objects.Geometry
	parseMeshGeometry( relationships, geoNode, deformers ) {

		const skeletons = deformers.skeletons;
		const morphTargets = [];

		const modelNodes = relationships.parents.map( function ( parent ) {

			return fbxTree.Objects.Model[ parent.ID ];

		} );

		// don't create geometry if it is not associated with any models
		if ( modelNodes.length === 0 ) return;

		const skeleton = relationships.children.reduce( function ( skeleton, child ) {

			if ( skeletons[ child.ID ] !== undefined ) skeleton = skeletons[ child.ID ];

			return skeleton;

		}, null );

		relationships.children.forEach( function ( child ) {

			if ( deformers.morphTargets[ child.ID ] !== undefined ) {

				morphTargets.push( deformers.morphTargets[ child.ID ] );

			}

		} );

		// Assume one model and get the preRotation from that
		// if there is more than one model associated with the geometry this may cause problems
		const modelNode = modelNodes[ 0 ];

		const transformData = {};

		if ( 'RotationOrder' in modelNode ) transformData.eulerOrder = getEulerOrder( modelNode.RotationOrder.value );
		if ( 'InheritType' in modelNode ) transformData.inheritType = parseInt( modelNode.InheritType.value );

		if ( 'GeometricTranslation' in modelNode ) transformData.translation = modelNode.GeometricTranslation.value;
		if ( 'GeometricRotation' in modelNode ) transformData.rotation = modelNode.GeometricRotation.value;
		if ( 'GeometricScaling' in modelNode ) transformData.scale = modelNode.GeometricScaling.value;

		const transform = generateTransform( transformData );

		return this.genGeometry( geoNode, skeleton, morphTargets, transform );

	}

	// Generate a BufferGeometry from a node in FBXTree.Objects.Geometry
	genGeometry( geoNode, skeleton, morphTargets, preTransform ) {

		const geo = new BufferGeometry();
		if ( geoNode.attrName ) geo.name = geoNode.attrName;

		const geoInfo = this.parseGeoNode( geoNode, skeleton );
		const buffers = this.genBuffers( geoInfo );

		const positionAttribute = new Float32BufferAttribute( buffers.vertex, 3 );

		positionAttribute.applyMatrix4( preTransform );

		geo.setAttribute( 'position', positionAttribute );

		if ( buffers.colors.length > 0 ) {

			geo.setAttribute( 'color', new Float32BufferAttribute( buffers.colors, 3 ) );

		}

		if ( skeleton ) {

			geo.setAttribute( 'skinIndex', new Uint16BufferAttribute( buffers.weightsIndices, 4 ) );

			geo.setAttribute( 'skinWeight', new Float32BufferAttribute( buffers.vertexWeights, 4 ) );

			// used later to bind the skeleton to the model
			geo.FBX_Deformer = skeleton;

		}

		if ( buffers.normal.length > 0 ) {

			const normalMatrix = new Matrix3().getNormalMatrix( preTransform );

			const normalAttribute = new Float32BufferAttribute( buffers.normal, 3 );
			normalAttribute.applyNormalMatrix( normalMatrix );

			geo.setAttribute( 'normal', normalAttribute );

		}

		buffers.uvs.forEach( function ( uvBuffer, i ) {

			// subsequent uv buffers are called 'uv1', 'uv2', ...
			let name = 'uv' + ( i + 1 ).toString();

			// the first uv buffer is just called 'uv'
			if ( i === 0 ) {

				name = 'uv';

			}

			geo.setAttribute( name, new Float32BufferAttribute( buffers.uvs[ i ], 2 ) );

		} );

		if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

			// Convert the material indices of each vertex into rendering groups on the geometry.
			let prevMaterialIndex = buffers.materialIndex[ 0 ];
			let startIndex = 0;

			buffers.materialIndex.forEach( function ( currentIndex, i ) {

				if ( currentIndex !== prevMaterialIndex ) {

					geo.addGroup( startIndex, i - startIndex, prevMaterialIndex );

					prevMaterialIndex = currentIndex;
					startIndex = i;

				}

			} );

			// the loop above doesn't add the last group, do that here.
			if ( geo.groups.length > 0 ) {

				const lastGroup = geo.groups[ geo.groups.length - 1 ];
				const lastIndex = lastGroup.start + lastGroup.count;

				if ( lastIndex !== buffers.materialIndex.length ) {

					geo.addGroup( lastIndex, buffers.materialIndex.length - lastIndex, prevMaterialIndex );

				}

			}

			// case where there are multiple materials but the whole geometry is only
			// using one of them
			if ( geo.groups.length === 0 ) {

				geo.addGroup( 0, buffers.materialIndex.length, buffers.materialIndex[ 0 ] );

			}

		}

		this.addMorphTargets( geo, geoNode, morphTargets, preTransform );

		return geo;

	}

	parseGeoNode( geoNode, skeleton ) {

		const geoInfo = {};

		geoInfo.vertexPositions = ( geoNode.Vertices !== undefined ) ? geoNode.Vertices.a : [];
		geoInfo.vertexIndices = ( geoNode.PolygonVertexIndex !== undefined ) ? geoNode.PolygonVertexIndex.a : [];

		if ( geoNode.LayerElementColor ) {

			geoInfo.color = this.parseVertexColors( geoNode.LayerElementColor[ 0 ] );

		}

		if ( geoNode.LayerElementMaterial ) {

			geoInfo.material = this.parseMaterialIndices( geoNode.LayerElementMaterial[ 0 ] );

		}

		if ( geoNode.LayerElementNormal ) {

			geoInfo.normal = this.parseNormals( geoNode.LayerElementNormal[ 0 ] );

		}

		if ( geoNode.LayerElementUV ) {

			geoInfo.uv = [];

			let i = 0;
			while ( geoNode.LayerElementUV[ i ] ) {

				if ( geoNode.LayerElementUV[ i ].UV ) {

					geoInfo.uv.push( this.parseUVs( geoNode.LayerElementUV[ i ] ) );

				}

				i ++;

			}

		}

		geoInfo.weightTable = {};

		if ( skeleton !== null ) {

			geoInfo.skeleton = skeleton;

			skeleton.rawBones.forEach( function ( rawBone, i ) {

				// loop over the bone's vertex indices and weights
				rawBone.indices.forEach( function ( index, j ) {

					if ( geoInfo.weightTable[ index ] === undefined ) geoInfo.weightTable[ index ] = [];

					geoInfo.weightTable[ index ].push( {

						id: i,
						weight: rawBone.weights[ j ],

					} );

				} );

			} );

		}

		return geoInfo;

	}

	genBuffers( geoInfo ) {

		const buffers = {
			vertex: [],
			normal: [],
			colors: [],
			uvs: [],
			materialIndex: [],
			vertexWeights: [],
			weightsIndices: [],
		};

		let polygonIndex = 0;
		let faceLength = 0;
		let displayedWeightsWarning = false;

		// these will hold data for a single face
		let facePositionIndexes = [];
		let faceNormals = [];
		let faceColors = [];
		let faceUVs = [];
		let faceWeights = [];
		let faceWeightIndices = [];

		const scope = this;
		geoInfo.vertexIndices.forEach( function ( vertexIndex, polygonVertexIndex ) {

			let materialIndex;
			let endOfFace = false;

			// Face index and vertex index arrays are combined in a single array
			// A cube with quad faces looks like this:
			// PolygonVertexIndex: *24 {
			//  a: 0, 1, 3, -3, 2, 3, 5, -5, 4, 5, 7, -7, 6, 7, 1, -1, 1, 7, 5, -4, 6, 0, 2, -5
			//  }
			// Negative numbers mark the end of a face - first face here is 0, 1, 3, -3
			// to find index of last vertex bit shift the index: ^ - 1
			if ( vertexIndex < 0 ) {

				vertexIndex = vertexIndex ^ - 1; // equivalent to ( x * -1 ) - 1
				endOfFace = true;

			}

			let weightIndices = [];
			let weights = [];

			facePositionIndexes.push( vertexIndex * 3, vertexIndex * 3 + 1, vertexIndex * 3 + 2 );

			if ( geoInfo.color ) {

				const data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.color );

				faceColors.push( data[ 0 ], data[ 1 ], data[ 2 ] );

			}

			if ( geoInfo.skeleton ) {

				if ( geoInfo.weightTable[ vertexIndex ] !== undefined ) {

					geoInfo.weightTable[ vertexIndex ].forEach( function ( wt ) {

						weights.push( wt.weight );
						weightIndices.push( wt.id );

					} );


				}

				if ( weights.length > 4 ) {

					if ( ! displayedWeightsWarning ) {

						console.warn( 'THREE.FBXLoader: Vertex has more than 4 skinning weights assigned to vertex. Deleting additional weights.' );
						displayedWeightsWarning = true;

					}

					const wIndex = [ 0, 0, 0, 0 ];
					const Weight = [ 0, 0, 0, 0 ];

					weights.forEach( function ( weight, weightIndex ) {

						let currentWeight = weight;
						let currentIndex = weightIndices[ weightIndex ];

						Weight.forEach( function ( comparedWeight, comparedWeightIndex, comparedWeightArray ) {

							if ( currentWeight > comparedWeight ) {

								comparedWeightArray[ comparedWeightIndex ] = currentWeight;
								currentWeight = comparedWeight;

								const tmp = wIndex[ comparedWeightIndex ];
								wIndex[ comparedWeightIndex ] = currentIndex;
								currentIndex = tmp;

							}

						} );

					} );

					weightIndices = wIndex;
					weights = Weight;

				}

				// if the weight array is shorter than 4 pad with 0s
				while ( weights.length < 4 ) {

					weights.push( 0 );
					weightIndices.push( 0 );

				}

				for ( let i = 0; i < 4; ++ i ) {

					faceWeights.push( weights[ i ] );
					faceWeightIndices.push( weightIndices[ i ] );

				}

			}

			if ( geoInfo.normal ) {

				const data = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.normal );

				faceNormals.push( data[ 0 ], data[ 1 ], data[ 2 ] );

			}

			if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

				materialIndex = getData( polygonVertexIndex, polygonIndex, vertexIndex, geoInfo.material )[ 0 ];

			}

			if ( geoInfo.uv ) {

				geoInfo.uv.forEach( function ( uv, i ) {

					const data = getData( polygonVertexIndex, polygonIndex, vertexIndex, uv );

					if ( faceUVs[ i ] === undefined ) {

						faceUVs[ i ] = [];

					}

					faceUVs[ i ].push( data[ 0 ] );
					faceUVs[ i ].push( data[ 1 ] );

				} );

			}

			faceLength ++;

			if ( endOfFace ) {

				scope.genFace( buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength );

				polygonIndex ++;
				faceLength = 0;

				// reset arrays for the next face
				facePositionIndexes = [];
				faceNormals = [];
				faceColors = [];
				faceUVs = [];
				faceWeights = [];
				faceWeightIndices = [];

			}

		} );

		return buffers;

	}

	// Generate data for a single face in a geometry. If the face is a quad then split it into 2 tris
	genFace( buffers, geoInfo, facePositionIndexes, materialIndex, faceNormals, faceColors, faceUVs, faceWeights, faceWeightIndices, faceLength ) {

		for ( let i = 2; i < faceLength; i ++ ) {

			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 0 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 1 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ 2 ] ] );

			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 + 1 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ ( i - 1 ) * 3 + 2 ] ] );

			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 + 1 ] ] );
			buffers.vertex.push( geoInfo.vertexPositions[ facePositionIndexes[ i * 3 + 2 ] ] );

			if ( geoInfo.skeleton ) {

				buffers.vertexWeights.push( faceWeights[ 0 ] );
				buffers.vertexWeights.push( faceWeights[ 1 ] );
				buffers.vertexWeights.push( faceWeights[ 2 ] );
				buffers.vertexWeights.push( faceWeights[ 3 ] );

				buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 ] );
				buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 1 ] );
				buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 2 ] );
				buffers.vertexWeights.push( faceWeights[ ( i - 1 ) * 4 + 3 ] );

				buffers.vertexWeights.push( faceWeights[ i * 4 ] );
				buffers.vertexWeights.push( faceWeights[ i * 4 + 1 ] );
				buffers.vertexWeights.push( faceWeights[ i * 4 + 2 ] );
				buffers.vertexWeights.push( faceWeights[ i * 4 + 3 ] );

				buffers.weightsIndices.push( faceWeightIndices[ 0 ] );
				buffers.weightsIndices.push( faceWeightIndices[ 1 ] );
				buffers.weightsIndices.push( faceWeightIndices[ 2 ] );
				buffers.weightsIndices.push( faceWeightIndices[ 3 ] );

				buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 ] );
				buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 1 ] );
				buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 2 ] );
				buffers.weightsIndices.push( faceWeightIndices[ ( i - 1 ) * 4 + 3 ] );

				buffers.weightsIndices.push( faceWeightIndices[ i * 4 ] );
				buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 1 ] );
				buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 2 ] );
				buffers.weightsIndices.push( faceWeightIndices[ i * 4 + 3 ] );

			}

			if ( geoInfo.color ) {

				buffers.colors.push( faceColors[ 0 ] );
				buffers.colors.push( faceColors[ 1 ] );
				buffers.colors.push( faceColors[ 2 ] );

				buffers.colors.push( faceColors[ ( i - 1 ) * 3 ] );
				buffers.colors.push( faceColors[ ( i - 1 ) * 3 + 1 ] );
				buffers.colors.push( faceColors[ ( i - 1 ) * 3 + 2 ] );

				buffers.colors.push( faceColors[ i * 3 ] );
				buffers.colors.push( faceColors[ i * 3 + 1 ] );
				buffers.colors.push( faceColors[ i * 3 + 2 ] );

			}

			if ( geoInfo.material && geoInfo.material.mappingType !== 'AllSame' ) {

				buffers.materialIndex.push( materialIndex );
				buffers.materialIndex.push( materialIndex );
				buffers.materialIndex.push( materialIndex );

			}

			if ( geoInfo.normal ) {

				buffers.normal.push( faceNormals[ 0 ] );
				buffers.normal.push( faceNormals[ 1 ] );
				buffers.normal.push( faceNormals[ 2 ] );

				buffers.normal.push( faceNormals[ ( i - 1 ) * 3 ] );
				buffers.normal.push( faceNormals[ ( i - 1 ) * 3 + 1 ] );
				buffers.normal.push( faceNormals[ ( i - 1 ) * 3 + 2 ] );

				buffers.normal.push( faceNormals[ i * 3 ] );
				buffers.normal.push( faceNormals[ i * 3 + 1 ] );
				buffers.normal.push( faceNormals[ i * 3 + 2 ] );

			}

			if ( geoInfo.uv ) {

				geoInfo.uv.forEach( function ( uv, j ) {

					if ( buffers.uvs[ j ] === undefined ) buffers.uvs[ j ] = [];

					buffers.uvs[ j ].push( faceUVs[ j ][ 0 ] );
					buffers.uvs[ j ].push( faceUVs[ j ][ 1 ] );

					buffers.uvs[ j ].push( faceUVs[ j ][ ( i - 1 ) * 2 ] );
					buffers.uvs[ j ].push( faceUVs[ j ][ ( i - 1 ) * 2 + 1 ] );

					buffers.uvs[ j ].push( faceUVs[ j ][ i * 2 ] );
					buffers.uvs[ j ].push( faceUVs[ j ][ i * 2 + 1 ] );

				} );

			}

		}

	}

	addMorphTargets( parentGeo, parentGeoNode, morphTargets, preTransform ) {

		if ( morphTargets.length === 0 ) return;

		parentGeo.morphTargetsRelative = true;

		parentGeo.morphAttributes.position = [];
		// parentGeo.morphAttributes.normal = []; // not implemented

		const scope = this;
		morphTargets.forEach( function ( morphTarget ) {

			morphTarget.rawTargets.forEach( function ( rawTarget ) {

				const morphGeoNode = fbxTree.Objects.Geometry[ rawTarget.geoID ];

				if ( morphGeoNode !== undefined ) {

					scope.genMorphGeometry( parentGeo, parentGeoNode, morphGeoNode, preTransform, rawTarget.name );

				}

			} );

		} );

	}

	// a morph geometry node is similar to a standard  node, and the node is also contained
	// in FBXTree.Objects.Geometry, however it can only have attributes for position, normal
	// and a special attribute Index defining which vertices of the original geometry are affected
	// Normal and position attributes only have data for the vertices that are affected by the morph
	genMorphGeometry( parentGeo, parentGeoNode, morphGeoNode, preTransform, name ) {

		const vertexIndices = ( parentGeoNode.PolygonVertexIndex !== undefined ) ? parentGeoNode.PolygonVertexIndex.a : [];

		const morphPositionsSparse = ( morphGeoNode.Vertices !== undefined ) ? morphGeoNode.Vertices.a : [];
		const indices = ( morphGeoNode.Indexes !== undefined ) ? morphGeoNode.Indexes.a : [];

		const length = parentGeo.attributes.position.count * 3;
		const morphPositions = new Float32Array( le…