3DMLoader.js

( function () {

	const _taskCache = new WeakMap();

	class Rhino3dmLoader extends THREE.Loader {

		constructor( manager ) {

			super( manager );
			this.libraryPath = '';
			this.libraryPending = null;
			this.libraryBinary = null;
			this.libraryConfig = {};
			this.url = '';
			this.workerLimit = 4;
			this.workerPool = [];
			this.workerNextTaskID = 1;
			this.workerSourceURL = '';
			this.workerConfig = {};
			this.materials = [];
			this.warnings = [];

		}

		setLibraryPath( path ) {

			this.libraryPath = path;
			return this;

		}

		setWorkerLimit( workerLimit ) {

			this.workerLimit = workerLimit;
			return this;

		}

		load( url, onLoad, onProgress, onError ) {

			const loader = new THREE.FileLoader( this.manager );
			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );
			loader.setRequestHeader( this.requestHeader );
			this.url = url;
			loader.load( url, buffer => {

				// Check for an existing task using this buffer. A transferred buffer cannot be transferred
				// again from this thread.
				if ( _taskCache.has( buffer ) ) {

					const cachedTask = _taskCache.get( buffer );

					return cachedTask.promise.then( onLoad ).catch( onError );

				}

				this.decodeObjects( buffer, url ).then( result => {

					result.userData.warnings = this.warnings;
					onLoad( result );

				} ).catch( e => onError( e ) );

			}, onProgress, onError );

		}

		debug() {

			console.log( 'Task load: ', this.workerPool.map( worker => worker._taskLoad ) );

		}

		decodeObjects( buffer, url ) {

			let worker;
			let taskID;
			const taskCost = buffer.byteLength;

			const objectPending = this._getWorker( taskCost ).then( _worker => {

				worker = _worker;
				taskID = this.workerNextTaskID ++;
				return new Promise( ( resolve, reject ) => {

					worker._callbacks[ taskID ] = {
						resolve,
						reject
					};
					worker.postMessage( {
						type: 'decode',
						id: taskID,
						buffer
					}, [ buffer ] ); // this.debug();

				} );

			} ).then( message => this._createGeometry( message.data ) ).catch( e => {

				throw e;

			} ); // Remove task from the task list.
			// Note: replaced '.finally()' with '.catch().then()' block - iOS 11 support (#19416)


			objectPending.catch( () => true ).then( () => {

				if ( worker && taskID ) {

					this._releaseTask( worker, taskID ); //this.debug();

				}

			} ); // Cache the task result.

			_taskCache.set( buffer, {
				url: url,
				promise: objectPending
			} );

			return objectPending;

		}

		parse( data, onLoad, onError ) {

			this.decodeObjects( data, '' ).then( result => {

				result.userData.warnings = this.warnings;
				onLoad( result );

			} ).catch( e => onError( e ) );

		}

		_compareMaterials( material ) {

			const mat = {};
			mat.name = material.name;
			mat.color = {};
			mat.color.r = material.color.r;
			mat.color.g = material.color.g;
			mat.color.b = material.color.b;
			mat.type = material.type;

			for ( let i = 0; i < this.materials.length; i ++ ) {

				const m = this.materials[ i ];
				const _mat = {};
				_mat.name = m.name;
				_mat.color = {};
				_mat.color.r = m.color.r;
				_mat.color.g = m.color.g;
				_mat.color.b = m.color.b;
				_mat.type = m.type;

				if ( JSON.stringify( mat ) === JSON.stringify( _mat ) ) {

					return m;

				}

			}

			this.materials.push( material );
			return material;

		}

		_createMaterial( material ) {

			if ( material === undefined ) {

				return new THREE.MeshStandardMaterial( {
					color: new THREE.Color( 1, 1, 1 ),
					metalness: 0.8,
					name: 'default',
					side: 2
				} );

			}

			const _diffuseColor = material.diffuseColor;
			const diffusecolor = new THREE.Color( _diffuseColor.r / 255.0, _diffuseColor.g / 255.0, _diffuseColor.b / 255.0 );

			if ( _diffuseColor.r === 0 && _diffuseColor.g === 0 && _diffuseColor.b === 0 ) {

				diffusecolor.r = 1;
				diffusecolor.g = 1;
				diffusecolor.b = 1;

			} // console.log( material );


			const mat = new THREE.MeshStandardMaterial( {
				color: diffusecolor,
				name: material.name,
				side: 2,
				transparent: material.transparency > 0 ? true : false,
				opacity: 1.0 - material.transparency
			} );
			const textureLoader = new THREE.TextureLoader();

			for ( let i = 0; i < material.textures.length; i ++ ) {

				const texture = material.textures[ i ];

				if ( texture.image !== null ) {

					const map = textureLoader.load( texture.image );

					switch ( texture.type ) {

						case 'Diffuse':
							mat.map = map;
							break;

						case 'Bump':
							mat.bumpMap = map;
							break;

						case 'Transparency':
							mat.alphaMap = map;
							mat.transparent = true;
							break;

						case 'Emap':
							mat.envMap = map;
							break;

					}

					map.wrapS = texture.wrapU === 0 ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
					map.wrapT = texture.wrapV === 0 ? THREE.RepeatWrapping : THREE.ClampToEdgeWrapping;
					map.repeat.set( texture.repeat[ 0 ], texture.repeat[ 1 ] );

				}

			}

			return mat;

		}

		_createGeometry( data ) {

			// console.log(data);
			const object = new THREE.Object3D();
			const instanceDefinitionObjects = [];
			const instanceDefinitions = [];
			const instanceReferences = [];
			object.userData[ 'layers' ] = data.layers;
			object.userData[ 'groups' ] = data.groups;
			object.userData[ 'settings' ] = data.settings;
			object.userData[ 'objectType' ] = 'File3dm';
			object.userData[ 'materials' ] = null;
			object.name = this.url;
			let objects = data.objects;
			const materials = data.materials;

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

				const obj = objects[ i ];
				const attributes = obj.attributes;

				switch ( obj.objectType ) {

					case 'InstanceDefinition':
						instanceDefinitions.push( obj );
						break;

					case 'InstanceReference':
						instanceReferences.push( obj );
						break;

					default:
						let _object;

						if ( attributes.materialIndex >= 0 ) {

							const rMaterial = materials[ attributes.materialIndex ];

							let material = this._createMaterial( rMaterial );

							material = this._compareMaterials( material );
							_object = this._createObject( obj, material );

						} else {

							const material = this._createMaterial();

							_object = this._createObject( obj, material );

						}

						if ( _object === undefined ) {

							continue;

						}

						const layer = data.layers[ attributes.layerIndex ];
						_object.visible = layer ? data.layers[ attributes.layerIndex ].visible : true;

						if ( attributes.isInstanceDefinitionObject ) {

							instanceDefinitionObjects.push( _object );

						} else {

							object.add( _object );

						}

						break;

				}

			}

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

				const iDef = instanceDefinitions[ i ];
				objects = [];

				for ( let j = 0; j < iDef.attributes.objectIds.length; j ++ ) {

					const objId = iDef.attributes.objectIds[ j ];

					for ( let p = 0; p < instanceDefinitionObjects.length; p ++ ) {

						const idoId = instanceDefinitionObjects[ p ].userData.attributes.id;

						if ( objId === idoId ) {

							objects.push( instanceDefinitionObjects[ p ] );

						}

					}

				} // Currently clones geometry and does not take advantage of instancing


				for ( let j = 0; j < instanceReferences.length; j ++ ) {

					const iRef = instanceReferences[ j ];

					if ( iRef.geometry.parentIdefId === iDef.attributes.id ) {

						const iRefObject = new THREE.Object3D();
						const xf = iRef.geometry.xform.array;
						const matrix = new THREE.Matrix4();
						matrix.set( xf[ 0 ], xf[ 1 ], xf[ 2 ], xf[ 3 ], xf[ 4 ], xf[ 5 ], xf[ 6 ], xf[ 7 ], xf[ 8 ], xf[ 9 ], xf[ 10 ], xf[ 11 ], xf[ 12 ], xf[ 13 ], xf[ 14 ], xf[ 15 ] );
						iRefObject.applyMatrix4( matrix );

						for ( let p = 0; p < objects.length; p ++ ) {

							iRefObject.add( objects[ p ].clone( true ) );

						}

						object.add( iRefObject );

					}

				}

			}

			object.userData[ 'materials' ] = this.materials;
			return object;

		}

		_createObject( obj, mat ) {

			const loader = new THREE.BufferGeometryLoader();
			const attributes = obj.attributes;

			let geometry, material, _color, color;

			switch ( obj.objectType ) {

				case 'Point':
				case 'PointSet':
					geometry = loader.parse( obj.geometry );

					if ( geometry.attributes.hasOwnProperty( 'color' ) ) {

						material = new THREE.PointsMaterial( {
							vertexColors: true,
							sizeAttenuation: false,
							size: 2
						} );

					} else {

						_color = attributes.drawColor;
						color = new THREE.Color( _color.r / 255.0, _color.g / 255.0, _color.b / 255.0 );
						material = new THREE.PointsMaterial( {
							color: color,
							sizeAttenuation: false,
							size: 2
						} );

					}

					material = this._compareMaterials( material );
					const points = new THREE.Points( geometry, material );
					points.userData[ 'attributes' ] = attributes;
					points.userData[ 'objectType' ] = obj.objectType;

					if ( attributes.name ) {

						points.name = attributes.name;

					}

					return points;

				case 'Mesh':
				case 'Extrusion':
				case 'SubD':
				case 'Brep':
					if ( obj.geometry === null ) return;
					geometry = loader.parse( obj.geometry );

					if ( geometry.attributes.hasOwnProperty( 'color' ) ) {

						mat.vertexColors = true;

					}

					if ( mat === null ) {

						mat = this._createMaterial();
						mat = this._compareMaterials( mat );

					}

					const mesh = new THREE.Mesh( geometry, mat );
					mesh.castShadow = attributes.castsShadows;
					mesh.receiveShadow = attributes.receivesShadows;
					mesh.userData[ 'attributes' ] = attributes;
					mesh.userData[ 'objectType' ] = obj.objectType;

					if ( attributes.name ) {

						mesh.name = attributes.name;

					}

					return mesh;

				case 'Curve':
					geometry = loader.parse( obj.geometry );
					_color = attributes.drawColor;
					color = new THREE.Color( _color.r / 255.0, _color.g / 255.0, _color.b / 255.0 );
					material = new THREE.LineBasicMaterial( {
						color: color
					} );
					material = this._compareMaterials( material );
					const lines = new THREE.Line( geometry, material );
					lines.userData[ 'attributes' ] = attributes;
					lines.userData[ 'objectType' ] = obj.objectType;

					if ( attributes.name ) {

						lines.name = attributes.name;

					}

					return lines;

				case 'TextDot':
					geometry = obj.geometry;
					const ctx = document.createElement( 'canvas' ).getContext( '2d' );
					const font = `${geometry.fontHeight}px ${geometry.fontFace}`;
					ctx.font = font;
					const width = ctx.measureText( geometry.text ).width + 10;
					const height = geometry.fontHeight + 10;
					const r = window.devicePixelRatio;
					ctx.canvas.width = width * r;
					ctx.canvas.height = height * r;
					ctx.canvas.style.width = width + 'px';
					ctx.canvas.style.height = height + 'px';
					ctx.setTransform( r, 0, 0, r, 0, 0 );
					ctx.font = font;
					ctx.textBaseline = 'middle';
					ctx.textAlign = 'center';
					color = attributes.drawColor;
					ctx.fillStyle = `rgba(${color.r},${color.g},${color.b},${color.a})`;
					ctx.fillRect( 0, 0, width, height );
					ctx.fillStyle = 'white';
					ctx.fillText( geometry.text, width / 2, height / 2 );
					const texture = new THREE.CanvasTexture( ctx.canvas );
					texture.minFilter = THREE.LinearFilter;
					texture.wrapS = THREE.ClampToEdgeWrapping;
					texture.wrapT = THREE.ClampToEdgeWrapping;
					material = new THREE.SpriteMaterial( {
						map: texture,
						depthTest: false
					} );
					const sprite = new THREE.Sprite( material );
					sprite.position.set( geometry.point[ 0 ], geometry.point[ 1 ], geometry.point[ 2 ] );
					sprite.scale.set( width / 10, height / 10, 1.0 );
					sprite.userData[ 'attributes' ] = attributes;
					sprite.userData[ 'objectType' ] = obj.objectType;

					if ( attributes.name ) {

						sprite.name = attributes.name;

					}

					return sprite;

				case 'Light':
					geometry = obj.geometry;
					let light;

					switch ( geometry.lightStyle.name ) {

						case 'LightStyle_WorldPoint':
							light = new THREE.PointLight();
							light.castShadow = attributes.castsShadows;
							light.position.set( geometry.location[ 0 ], geometry.location[ 1 ], geometry.location[ 2 ] );
							light.shadow.normalBias = 0.1;
							break;

						case 'LightStyle_WorldSpot':
							light = new THREE.SpotLight();
							light.castShadow = attributes.castsShadows;
							light.position.set( geometry.location[ 0 ], geometry.location[ 1 ], geometry.location[ 2 ] );
							light.target.position.set( geometry.direction[ 0 ], geometry.direction[ 1 ], geometry.direction[ 2 ] );
							light.angle = geometry.spotAngleRadians;
							light.shadow.normalBias = 0.1;
							break;

						case 'LightStyle_WorldRectangular':
							light = new THREE.RectAreaLight();
							const width = Math.abs( geometry.width[ 2 ] );
							const height = Math.abs( geometry.length[ 0 ] );
							light.position.set( geometry.location[ 0 ] - height / 2, geometry.location[ 1 ], geometry.location[ 2 ] - width / 2 );
							light.height = height;
							light.width = width;
							light.lookAt( new THREE.Vector3( geometry.direction[ 0 ], geometry.direction[ 1 ], geometry.direction[ 2 ] ) );
							break;

						case 'LightStyle_WorldDirectional':
							light = new THREE.DirectionalLight();
							light.castShadow = attributes.castsShadows;
							light.position.set( geometry.location[ 0 ], geometry.location[ 1 ], geometry.location[ 2 ] );
							light.target.position.set( geometry.direction[ 0 ], geometry.direction[ 1 ], geometry.direction[ 2 ] );
							light.shadow.normalBias = 0.1;
							break;

						case 'LightStyle_WorldLinear':
							// not conversion exists, warning has already been printed to the console
							break;

						default:
							break;

					}

					if ( light ) {

						light.intensity = geometry.intensity;
						_color = geometry.diffuse;
						color = new THREE.Color( _color.r / 255.0, _color.g / 255.0, _color.b / 255.0 );
						light.color = color;
						light.userData[ 'attributes' ] = attributes;
						light.userData[ 'objectType' ] = obj.objectType;

					}

					return light;

			}

		}

		_initLibrary() {

			if ( ! this.libraryPending ) {

				// Load rhino3dm wrapper.
				const jsLoader = new THREE.FileLoader( this.manager );
				jsLoader.setPath( this.libraryPath );
				const jsContent = new Promise( ( resolve, reject ) => {

					jsLoader.load( 'rhino3dm.js', resolve, undefined, reject );

				} ); // Load rhino3dm WASM binary.

				const binaryLoader = new THREE.FileLoader( this.manager );
				binaryLoader.setPath( this.libraryPath );
				binaryLoader.setResponseType( 'arraybuffer' );
				const binaryContent = new Promise( ( resolve, reject ) => {

					binaryLoader.load( 'rhino3dm.wasm', resolve, undefined, reject );

				} );
				this.libraryPending = Promise.all( [ jsContent, binaryContent ] ).then( ( [ jsContent, binaryContent ] ) => {

					//this.libraryBinary = binaryContent;
					this.libraryConfig.wasmBinary = binaryContent;
					const fn = Rhino3dmWorker.toString();
					const body = [ '/* rhino3dm.js */', jsContent, '/* worker */', fn.substring( fn.indexOf( '{' ) + 1, fn.lastIndexOf( '}' ) ) ].join( '\n' );
					this.workerSourceURL = URL.createObjectURL( new Blob( [ body ] ) );

				} );

			}

			return this.libraryPending;

		}

		_getWorker( taskCost ) {

			return this._initLibrary().then( () => {

				if ( this.workerPool.length < this.workerLimit ) {

					const worker = new Worker( this.workerSourceURL );
					worker._callbacks = {};
					worker._taskCosts = {};
					worker._taskLoad = 0;
					worker.postMessage( {
						type: 'init',
						libraryConfig: this.libraryConfig
					} );

					worker.onmessage = e => {

						const message = e.data;

						switch ( message.type ) {

							case 'warning':
								this.warnings.push( message.data );
								console.warn( message.data );
								break;

							case 'decode':
								worker._callbacks[ message.id ].resolve( message );

								break;

							case 'error':
								worker._callbacks[ message.id ].reject( message );

								break;

							default:
								console.error( 'THREE.Rhino3dmLoader: Unexpected message, "' + message.type + '"' );

						}

					};

					this.workerPool.push( worker );

				} else {

					this.workerPool.sort( function ( a, b ) {

						return a._taskLoad > b._taskLoad ? - 1 : 1;

					} );

				}

				const worker = this.workerPool[ this.workerPool.length - 1 ];
				worker._taskLoad += taskCost;
				return worker;

			} );

		}

		_releaseTask( worker, taskID ) {

			worker._taskLoad -= worker._taskCosts[ taskID ];
			delete worker._callbacks[ taskID ];
			delete worker._taskCosts[ taskID ];

		}

		dispose() {

			for ( let i = 0; i < this.workerPool.length; ++ i ) {

				this.workerPool[ i ].terminate();

			}

			this.workerPool.length = 0;
			return this;

		}

	}
	/* WEB WORKER */


	function Rhino3dmWorker() {

		let libraryPending;
		let libraryConfig;
		let rhino;
		let taskID;

		onmessage = function ( e ) {

			const message = e.data;

			switch ( message.type ) {

				case 'init':
					// console.log(message)
					libraryConfig = message.libraryConfig;
					const wasmBinary = libraryConfig.wasmBinary;
					let RhinoModule;
					libraryPending = new Promise( function ( resolve ) {

						/* Like Basis THREE.Loader */
						RhinoModule = {
							wasmBinary,
							onRuntimeInitialized: resolve
						};
						rhino3dm( RhinoModule ); // eslint-disable-line no-undef

					} ).then( () => {

						rhino = RhinoModule;

					} );
					break;

				case 'decode':
					taskID = message.id;
					const buffer = message.buffer;
					libraryPending.then( () => {

						try {

							const data = decodeObjects( rhino, buffer );
							self.postMessage( {
								type: 'decode',
								id: message.id,
								data
							} );

						} catch ( error ) {

							self.postMessage( {
								type: 'error',
								id: message.id,
								error
							} );

						}

					} );
					break;

			}

		};

		function decodeObjects( rhino, buffer ) {

			const arr = new Uint8Array( buffer );
			const doc = rhino.File3dm.fromByteArray( arr );
			const objects = [];
			const materials = [];
			const layers = [];
			const views = [];
			const namedViews = [];
			const groups = [];
			const strings = []; //Handle objects

			const objs = doc.objects();
			const cnt = objs.count;

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

				const _object = objs.get( i );

				const object = extractObjectData( _object, doc );

				_object.delete();

				if ( object ) {

					objects.push( object );

				}

			} // Handle instance definitions
			// console.log( `Instance Definitions Count: ${doc.instanceDefinitions().count()}` );


			for ( let i = 0; i < doc.instanceDefinitions().count(); i ++ ) {

				const idef = doc.instanceDefinitions().get( i );
				const idefAttributes = extractProperties( idef );
				idefAttributes.objectIds = idef.getObjectIds();
				objects.push( {
					geometry: null,
					attributes: idefAttributes,
					objectType: 'InstanceDefinition'
				} );

			} // Handle materials


			const textureTypes = [// rhino.TextureType.Bitmap,
				rhino.TextureType.Diffuse, rhino.TextureType.Bump, rhino.TextureType.Transparency, rhino.TextureType.Opacity, rhino.TextureType.Emap ];
			const pbrTextureTypes = [ rhino.TextureType.PBR_BaseColor, rhino.TextureType.PBR_Subsurface, rhino.TextureType.PBR_SubsurfaceScattering, rhino.TextureType.PBR_SubsurfaceScatteringRadius, rhino.TextureType.PBR_Metallic, rhino.TextureType.PBR_Specular, rhino.TextureType.PBR_SpecularTint, rhino.TextureType.PBR_Roughness, rhino.TextureType.PBR_Anisotropic, rhino.TextureType.PBR_Anisotropic_Rotation, rhino.TextureType.PBR_Sheen, rhino.TextureType.PBR_SheenTint, rhino.TextureType.PBR_Clearcoat, rhino.TextureType.PBR_ClearcoatBump, rhino.TextureType.PBR_ClearcoatRoughness, rhino.TextureType.PBR_OpacityIor, rhino.TextureType.PBR_OpacityRoughness, rhino.TextureType.PBR_Emission, rhino.TextureType.PBR_AmbientOcclusion, rhino.TextureType.PBR_Displacement ];

			for ( let i = 0; i < doc.materials().count(); i ++ ) {

				const _material = doc.materials().get( i );

				const _pbrMaterial = _material.physicallyBased();

				let material = extractProperties( _material );
				const textures = [];

				for ( let j = 0; j < textureTypes.length; j ++ ) {

					const _texture = _material.getTexture( textureTypes[ j ] );

					if ( _texture ) {

						let textureType = textureTypes[ j ].constructor.name;
						textureType = textureType.substring( 12, textureType.length );
						const texture = {
							type: textureType
						};
						const image = doc.getEmbeddedFileAsBase64( _texture.fileName );
						texture.wrapU = _texture.wrapU;
						texture.wrapV = _texture.wrapV;
						texture.wrapW = _texture.wrapW;

						const uvw = _texture.uvwTransform.toFloatArray( true );

						texture.repeat = [ uvw[ 0 ], uvw[ 5 ] ];

						if ( image ) {

							texture.image = 'data:image/png;base64,' + image;

						} else {

							self.postMessage( {
								type: 'warning',
								id: taskID,
								data: {
									message: `THREE.3DMLoader: Image for ${textureType} texture not embedded in file.`,
									type: 'missing resource'
								}
							} );
							texture.image = null;

						}

						textures.push( texture );

						_texture.delete();

					}

				}

				material.textures = textures;

				if ( _pbrMaterial.supported ) {

					for ( let j = 0; j < pbrTextureTypes.length; j ++ ) {

						const _texture = _material.getTexture( pbrTextureTypes[ j ] );

						if ( _texture ) {

							const image = doc.getEmbeddedFileAsBase64( _texture.fileName );
							let textureType = pbrTextureTypes[ j ].constructor.name;
							textureType = textureType.substring( 12, textureType.length );
							const texture = {
								type: textureType,
								image: 'data:image/png;base64,' + image
							};
							textures.push( texture );

							_texture.delete();

						}

					}

					const pbMaterialProperties = extractProperties( _material.physicallyBased() );
					material = Object.assign( pbMaterialProperties, material );

				}

				materials.push( material );

				_material.delete();

				_pbrMaterial.delete();

			} // Handle layers


			for ( let i = 0; i < doc.layers().count(); i ++ ) {

				const _layer = doc.layers().get( i );

				const layer = extractProperties( _layer );
				layers.push( layer );

				_layer.delete();

			} // Handle views


			for ( let i = 0; i < doc.views().count(); i ++ ) {

				const _view = doc.views().get( i );

				const view = extractProperties( _view );
				views.push( view );

				_view.delete();

			} // Handle named views


			for ( let i = 0; i < doc.namedViews().count(); i ++ ) {

				const _namedView = doc.namedViews().get( i );

				const namedView = extractProperties( _namedView );
				namedViews.push( namedView );

				_namedView.delete();

			} // Handle groups


			for ( let i = 0; i < doc.groups().count(); i ++ ) {

				const _group = doc.groups().get( i );

				const group = extractProperties( _group );
				groups.push( group );

				_group.delete();

			} // Handle settings


			const settings = extractProperties( doc.settings() ); //TODO: Handle other document stuff like dimstyles, instance definitions, bitmaps etc.
			// Handle dimstyles
			// console.log( `Dimstyle Count: ${doc.dimstyles().count()}` );
			// Handle bitmaps
			// console.log( `Bitmap Count: ${doc.bitmaps().count()}` );
			// Handle strings
			// console.log( `Document Strings Count: ${doc.strings().count()}` );
			// Note: doc.strings().documentUserTextCount() counts any doc.strings defined in a section
			//console.log( `Document User Text Count: ${doc.strings().documentUserTextCount()}` );

			const strings_count = doc.strings().count();

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

				strings.push( doc.strings().get( i ) );

			}

			doc.delete();
			return {
				objects,
				materials,
				layers,
				views,
				namedViews,
				groups,
				strings,
				settings
			};

		}

		function extractObjectData( object, doc ) {

			const _geometry = object.geometry();

			const _attributes = object.attributes();

			let objectType = _geometry.objectType;
			let geometry, attributes, position, data, mesh; // skip instance definition objects
			//if( _attributes.isInstanceDefinitionObject ) { continue; }
			// TODO: handle other geometry types

			switch ( objectType ) {

				case rhino.ObjectType.Curve:
					const pts = curveToPoints( _geometry, 100 );
					position = {};
					attributes = {};
					data = {};
					position.itemSize = 3;
					position.type = 'Float32Array';
					position.array = [];

					for ( let j = 0; j < pts.length; j ++ ) {

						position.array.push( pts[ j ][ 0 ] );
						position.array.push( pts[ j ][ 1 ] );
						position.array.push( pts[ j ][ 2 ] );

					}

					attributes.position = position;
					data.attributes = attributes;
					geometry = {
						data
					};
					break;

				case rhino.ObjectType.Point:
					const pt = _geometry.location;
					position = {};
					const color = {};
					attributes = {};
					data = {};
					position.itemSize = 3;
					position.type = 'Float32Array';
					position.array = [ pt[ 0 ], pt[ 1 ], pt[ 2 ] ];

					const _color = _attributes.drawColor( doc );

					color.itemSize = 3;
					color.type = 'Float32Array';
					color.array = [ _color.r / 255.0, _color.g / 255.0, _color.b / 255.0 ];
					attributes.position = position;
					attributes.color = color;
					data.attributes = attributes;
					geometry = {
						data
					};
					break;

				case rhino.ObjectType.PointSet:
				case rhino.ObjectType.Mesh:
					geometry = _geometry.toThreejsJSON();
					break;

				case rhino.ObjectType.Brep:
					const faces = _geometry.faces();

					mesh = new rhino.Mesh();

					for ( let faceIndex = 0; faceIndex < faces.count; faceIndex ++ ) {

						const face = faces.get( faceIndex );

						const _mesh = face.getMesh( rhino.MeshType.Any );

						if ( _mesh ) {

							mesh.append( _mesh );

							_mesh.delete();

						}

						face.delete();

					}

					if ( mesh.faces().count > 0 ) {

						mesh.compact();
						geometry = mesh.toThreejsJSON();
						faces.delete();

					}

					mesh.delete();
					break;

				case rhino.ObjectType.Extrusion:
					mesh = _geometry.getMesh( rhino.MeshType.Any );

					if ( mesh ) {

						geometry = mesh.toThreejsJSON();
						mesh.delete();

					}

					break;

				case rhino.ObjectType.TextDot:
					geometry = extractProperties( _geometry );
					break;

				case rhino.ObjectType.Light:
					geometry = extractProperties( _geometry );

					if ( geometry.lightStyle.name === 'LightStyle_WorldLinear' ) {

						self.postMessage( {
							type: 'warning',
							id: taskID,
							data: {
								message: `THREE.3DMLoader: No conversion exists for ${objectType.constructor.name} ${geometry.lightStyle.name}`,
								type: 'no conversion',
								guid: _attributes.id
							}
						} );

					}

					break;

				case rhino.ObjectType.InstanceReference:
					geometry = extractProperties( _geometry );
					geometry.xform = extractProperties( _geometry.xform );
					geometry.xform.array = _geometry.xform.toFloatArray( true );
					break;

				case rhino.ObjectType.SubD:
					// TODO: precalculate resulting vertices and faces and warn on excessive results
					_geometry.subdivide( 3 );

					mesh = rhino.Mesh.createFromSubDControlNet( _geometry );

					if ( mesh ) {

						geometry = mesh.toThreejsJSON();
						mesh.delete();

					}

					break;

					/*
      case rhino.ObjectType.Annotation:
      case rhino.ObjectType.Hatch:
      case rhino.ObjectType.ClipPlane:
      */

				default:
					self.postMessage( {
						type: 'warning',
						id: taskID,
						data: {
							message: `THREE.3DMLoader: Conversion not implemented for ${objectType.constructor.name}`,
							type: 'not implemented',
							guid: _attributes.id
						}
					} );
					break;

			}

			if ( geometry ) {

				attributes = extractProperties( _attributes );
				attributes.geometry = extractProperties( _geometry );

				if ( _attributes.groupCount > 0 ) {

					attributes.groupIds = _attributes.getGroupList();

				}

				if ( _attributes.userStringCount > 0 ) {

					attributes.userStrings = _attributes.getUserStrings();

				}

				if ( _geometry.userStringCount > 0 ) {

					attributes.geometry.userStrings = _geometry.getUserStrings();

				}

				attributes.drawColor = _attributes.drawColor( doc );
				objectType = objectType.constructor.name;
				objectType = objectType.substring( 11, objectType.length );
				return {
					geometry,
					attributes,
					objectType
				};

			} else {

				self.postMessage( {
					type: 'warning',
					id: taskID,
					data: {
						message: `THREE.3DMLoader: ${objectType.constructor.name} has no associated mesh geometry.`,
						type: 'missing mesh',
						guid: _attributes.id
					}
				} );

			}

		}

		function extractProperties( object ) {

			const result = {};

			for ( const property in object ) {

				const value = object[ property ];

				if ( typeof value !== 'function' ) {

					if ( typeof value === 'object' && value !== null && value.hasOwnProperty( 'constructor' ) ) {

						result[ property ] = {
							name: value.constructor.name,
							value: value.value
						};

					} else {

						result[ property ] = value;

					}

				} else { // these are functions that could be called to extract more data.
					//console.log( `${property}: ${object[ property ].constructor.name}` );
				}

			}

			return result;

		}

		function curveToPoints( curve, pointLimit ) {

			let pointCount = pointLimit;
			let rc = [];
			const ts = [];

			if ( curve instanceof rhino.LineCurve ) {

				return [ curve.pointAtStart, curve.pointAtEnd ];

			}

			if ( curve instanceof rhino.PolylineCurve ) {

				pointCount = curve.pointCount;

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

					rc.push( curve.point( i ) );

				}

				return rc;

			}

			if ( curve instanceof rhino.PolyCurve ) {

				const segmentCount = curve.segmentCount;

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

					const segment = curve.segmentCurve( i );
					const segmentArray = curveToPoints( segment, pointCount );
					rc = rc.concat( segmentArray );
					segment.delete();

				}

				return rc;

			}

			if ( curve instanceof rhino.ArcCurve ) {

				pointCount = Math.floor( curve.angleDegrees / 5 );
				pointCount = pointCount < 2 ? 2 : pointCount; // alternative to this hardcoded version: https://stackoverflow.com/a/18499923/2179399

			}

			if ( curve instanceof rhino.NurbsCurve && curve.degree === 1 ) {

				const pLine = curve.tryGetPolyline();

				for ( let i = 0; i < pLine.count; i ++ ) {

					rc.push( pLine.get( i ) );

				}

				pLine.delete();
				return rc;

			}

			const domain = curve.domain;
			const divisions = pointCount - 1.0;

			for ( let j = 0; j < pointCount; j ++ ) {

				const t = domain[ 0 ] + j / divisions * ( domain[ 1 ] - domain[ 0 ] );

				if ( t === domain[ 0 ] || t === domain[ 1 ] ) {

					ts.push( t );
					continue;

				}

				const tan = curve.tangentAt( t );
				const prevTan = curve.tangentAt( ts.slice( - 1 )[ 0 ] ); // Duplicated from THREE.Vector3
				// How to pass imports to worker?

				const tS = tan[ 0 ] * tan[ 0 ] + tan[ 1 ] * tan[ 1 ] + tan[ 2 ] * tan[ 2 ];
				const ptS = prevTan[ 0 ] * prevTan[ 0 ] + prevTan[ 1 ] * prevTan[ 1 ] + prevTan[ 2 ] * prevTan[ 2 ];
				const denominator = Math.sqrt( tS * ptS );
				let angle;

				if ( denominator === 0 ) {

					angle = Math.PI / 2;

				} else {

					const theta = ( tan.x * prevTan.x + tan.y * prevTan.y + tan.z * prevTan.z ) / denominator;
					angle = Math.acos( Math.max( - 1, Math.min( 1, theta ) ) );

				}

				if ( angle < 0.1 ) continue;
				ts.push( t );

			}

			rc = ts.map( t => curve.pointAt( t ) );
			return rc;

		}

	}

	THREE.Rhino3dmLoader = Rhino3dmLoader;

} )();