/examples/js/loaders/PLYLoader.js

( function () {

	/**
 * Description: A THREE loader for PLY ASCII files (known as the Polygon
 * File Format or the Stanford Triangle Format).
 *
 * Limitations: ASCII decoding assumes file is UTF-8.
 *
 * Usage:
 *	const loader = new PLYLoader();
 *	loader.load('./models/ply/ascii/dolphins.ply', function (geometry) {
 *
 *		scene.add( new THREE.Mesh( geometry ) );
 *
 *	} );
 *
 * If the PLY file uses non standard property names, they can be mapped while
 * loading. For example, the following maps the properties
 * “diffuse_(red|green|blue)” in the file to standard color names.
 *
 * loader.setPropertyNameMapping( {
 *	diffuse_red: 'red',
 *	diffuse_green: 'green',
 *	diffuse_blue: 'blue'
 * } );
 *
 */

	const _color = new THREE.Color();

	class PLYLoader extends THREE.Loader {

		constructor( manager ) {

			super( manager );
			this.propertyNameMapping = {};

		}

		load( url, onLoad, onProgress, onError ) {

			const scope = this;
			const loader = new THREE.FileLoader( this.manager );
			loader.setPath( this.path );
			loader.setResponseType( 'arraybuffer' );
			loader.setRequestHeader( this.requestHeader );
			loader.setWithCredentials( this.withCredentials );
			loader.load( url, function ( text ) {

				try {

					onLoad( scope.parse( text ) );

				} catch ( e ) {

					if ( onError ) {

						onError( e );

					} else {

						console.error( e );

					}

					scope.manager.itemError( url );

				}

			}, onProgress, onError );

		}

		setPropertyNameMapping( mapping ) {

			this.propertyNameMapping = mapping;

		}

		parse( data ) {

			function parseHeader( data ) {

				const patternHeader = /^ply([\s\S]*)end_header\r?\n/;
				let headerText = '';
				let headerLength = 0;
				const result = patternHeader.exec( data );

				if ( result !== null ) {

					headerText = result[ 1 ];
					headerLength = new Blob( [ result[ 0 ] ] ).size;

				}

				const header = {
					comments: [],
					elements: [],
					headerLength: headerLength,
					objInfo: ''
				};
				const lines = headerText.split( '\n' );
				let currentElement;

				function make_ply_element_property( propertValues, propertyNameMapping ) {

					const property = {
						type: propertValues[ 0 ]
					};

					if ( property.type === 'list' ) {

						property.name = propertValues[ 3 ];
						property.countType = propertValues[ 1 ];
						property.itemType = propertValues[ 2 ];

					} else {

						property.name = propertValues[ 1 ];

					}

					if ( property.name in propertyNameMapping ) {

						property.name = propertyNameMapping[ property.name ];

					}

					return property;

				}

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

					let line = lines[ i ];
					line = line.trim();
					if ( line === '' ) continue;
					const lineValues = line.split( /\s+/ );
					const lineType = lineValues.shift();
					line = lineValues.join( ' ' );

					switch ( lineType ) {

						case 'format':
							header.format = lineValues[ 0 ];
							header.version = lineValues[ 1 ];
							break;

						case 'comment':
							header.comments.push( line );
							break;

						case 'element':
							if ( currentElement !== undefined ) {

								header.elements.push( currentElement );

							}

							currentElement = {};
							currentElement.name = lineValues[ 0 ];
							currentElement.count = parseInt( lineValues[ 1 ] );
							currentElement.properties = [];
							break;

						case 'property':
							currentElement.properties.push( make_ply_element_property( lineValues, scope.propertyNameMapping ) );
							break;

						case 'obj_info':
							header.objInfo = line;
							break;

						default:
							console.log( 'unhandled', lineType, lineValues );

					}

				}

				if ( currentElement !== undefined ) {

					header.elements.push( currentElement );

				}

				return header;

			}

			function parseASCIINumber( n, type ) {

				switch ( type ) {

					case 'char':
					case 'uchar':
					case 'short':
					case 'ushort':
					case 'int':
					case 'uint':
					case 'int8':
					case 'uint8':
					case 'int16':
					case 'uint16':
					case 'int32':
					case 'uint32':
						return parseInt( n );

					case 'float':
					case 'double':
					case 'float32':
					case 'float64':
						return parseFloat( n );

				}

			}

			function parseASCIIElement( properties, line ) {

				const values = line.split( /\s+/ );
				const element = {};

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

					if ( properties[ i ].type === 'list' ) {

						const list = [];
						const n = parseASCIINumber( values.shift(), properties[ i ].countType );

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

							list.push( parseASCIINumber( values.shift(), properties[ i ].itemType ) );

						}

						element[ properties[ i ].name ] = list;

					} else {

						element[ properties[ i ].name ] = parseASCIINumber( values.shift(), properties[ i ].type );

					}

				}

				return element;

			}

			function parseASCII( data, header ) {

				// PLY ascii format specification, as per http://en.wikipedia.org/wiki/PLY_(file_format)
				const buffer = {
					indices: [],
					vertices: [],
					normals: [],
					uvs: [],
					faceVertexUvs: [],
					colors: []
				};
				let result;
				const patternBody = /end_header\s([\s\S]*)$/;
				let body = '';

				if ( ( result = patternBody.exec( data ) ) !== null ) {

					body = result[ 1 ];

				}

				const lines = body.split( '\n' );
				let currentElement = 0;
				let currentElementCount = 0;

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

					let line = lines[ i ];
					line = line.trim();

					if ( line === '' ) {

						continue;

					}

					if ( currentElementCount >= header.elements[ currentElement ].count ) {

						currentElement ++;
						currentElementCount = 0;

					}

					const element = parseASCIIElement( header.elements[ currentElement ].properties, line );
					handleElement( buffer, header.elements[ currentElement ].name, element );
					currentElementCount ++;

				}

				return postProcess( buffer );

			}

			function postProcess( buffer ) {

				let geometry = new THREE.BufferGeometry(); // mandatory buffer data

				if ( buffer.indices.length > 0 ) {

					geometry.setIndex( buffer.indices );

				}

				geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( buffer.vertices, 3 ) ); // optional buffer data

				if ( buffer.normals.length > 0 ) {

					geometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( buffer.normals, 3 ) );

				}

				if ( buffer.uvs.length > 0 ) {

					geometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( buffer.uvs, 2 ) );

				}

				if ( buffer.colors.length > 0 ) {

					geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( buffer.colors, 3 ) );

				}

				if ( buffer.faceVertexUvs.length > 0 ) {

					geometry = geometry.toNonIndexed();
					geometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( buffer.faceVertexUvs, 2 ) );

				}

				geometry.computeBoundingSphere();
				return geometry;

			}

			function handleElement( buffer, elementName, element ) {

				function findAttrName( names ) {

					for ( let i = 0, l = names.length; i < l; i ++ ) {

						const name = names[ i ];
						if ( name in element ) return name;

					}

					return null;

				}

				const attrX = findAttrName( [ 'x', 'px', 'posx' ] ) || 'x';
				const attrY = findAttrName( [ 'y', 'py', 'posy' ] ) || 'y';
				const attrZ = findAttrName( [ 'z', 'pz', 'posz' ] ) || 'z';
				const attrNX = findAttrName( [ 'nx', 'normalx' ] );
				const attrNY = findAttrName( [ 'ny', 'normaly' ] );
				const attrNZ = findAttrName( [ 'nz', 'normalz' ] );
				const attrS = findAttrName( [ 's', 'u', 'texture_u', 'tx' ] );
				const attrT = findAttrName( [ 't', 'v', 'texture_v', 'ty' ] );
				const attrR = findAttrName( [ 'red', 'diffuse_red', 'r', 'diffuse_r' ] );
				const attrG = findAttrName( [ 'green', 'diffuse_green', 'g', 'diffuse_g' ] );
				const attrB = findAttrName( [ 'blue', 'diffuse_blue', 'b', 'diffuse_b' ] );

				if ( elementName === 'vertex' ) {

					buffer.vertices.push( element[ attrX ], element[ attrY ], element[ attrZ ] );

					if ( attrNX !== null && attrNY !== null && attrNZ !== null ) {

						buffer.normals.push( element[ attrNX ], element[ attrNY ], element[ attrNZ ] );

					}

					if ( attrS !== null && attrT !== null ) {

						buffer.uvs.push( element[ attrS ], element[ attrT ] );

					}

					if ( attrR !== null && attrG !== null && attrB !== null ) {

						_color.setRGB( element[ attrR ] / 255.0, element[ attrG ] / 255.0, element[ attrB ] / 255.0 ).convertSRGBToLinear();

						buffer.colors.push( _color.r, _color.g, _color.b );

					}

				} else if ( elementName === 'face' ) {

					const vertex_indices = element.vertex_indices || element.vertex_index; // issue #9338

					const texcoord = element.texcoord;

					if ( vertex_indices.length === 3 ) {

						buffer.indices.push( vertex_indices[ 0 ], vertex_indices[ 1 ], vertex_indices[ 2 ] );

						if ( texcoord && texcoord.length === 6 ) {

							buffer.faceVertexUvs.push( texcoord[ 0 ], texcoord[ 1 ] );
							buffer.faceVertexUvs.push( texcoord[ 2 ], texcoord[ 3 ] );
							buffer.faceVertexUvs.push( texcoord[ 4 ], texcoord[ 5 ] );

						}

					} else if ( vertex_indices.length === 4 ) {

						buffer.indices.push( vertex_indices[ 0 ], vertex_indices[ 1 ], vertex_indices[ 3 ] );
						buffer.indices.push( vertex_indices[ 1 ], vertex_indices[ 2 ], vertex_indices[ 3 ] );

					}

				}

			}

			function binaryRead( dataview, at, type, little_endian ) {

				switch ( type ) {

					// corespondences for non-specific length types here match rply:
					case 'int8':
					case 'char':
						return [ dataview.getInt8( at ), 1 ];

					case 'uint8':
					case 'uchar':
						return [ dataview.getUint8( at ), 1 ];

					case 'int16':
					case 'short':
						return [ dataview.getInt16( at, little_endian ), 2 ];

					case 'uint16':
					case 'ushort':
						return [ dataview.getUint16( at, little_endian ), 2 ];

					case 'int32':
					case 'int':
						return [ dataview.getInt32( at, little_endian ), 4 ];

					case 'uint32':
					case 'uint':
						return [ dataview.getUint32( at, little_endian ), 4 ];

					case 'float32':
					case 'float':
						return [ dataview.getFloat32( at, little_endian ), 4 ];

					case 'float64':
					case 'double':
						return [ dataview.getFloat64( at, little_endian ), 8 ];

				}

			}

			function binaryReadElement( dataview, at, properties, little_endian ) {

				const element = {};
				let result,
					read = 0;

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

					if ( properties[ i ].type === 'list' ) {

						const list = [];
						result = binaryRead( dataview, at + read, properties[ i ].countType, little_endian );
						const n = result[ 0 ];
						read += result[ 1 ];

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

							result = binaryRead( dataview, at + read, properties[ i ].itemType, little_endian );
							list.push( result[ 0 ] );
							read += result[ 1 ];

						}

						element[ properties[ i ].name ] = list;

					} else {

						result = binaryRead( dataview, at + read, properties[ i ].type, little_endian );
						element[ properties[ i ].name ] = result[ 0 ];
						read += result[ 1 ];

					}

				}

				return [ element, read ];

			}

			function parseBinary( data, header ) {

				const buffer = {
					indices: [],
					vertices: [],
					normals: [],
					uvs: [],
					faceVertexUvs: [],
					colors: []
				};
				const little_endian = header.format === 'binary_little_endian';
				const body = new DataView( data, header.headerLength );
				let result,
					loc = 0;

				for ( let currentElement = 0; currentElement < header.elements.length; currentElement ++ ) {

					for ( let currentElementCount = 0; currentElementCount < header.elements[ currentElement ].count; currentElementCount ++ ) {

						result = binaryReadElement( body, loc, header.elements[ currentElement ].properties, little_endian );
						loc += result[ 1 ];
						const element = result[ 0 ];
						handleElement( buffer, header.elements[ currentElement ].name, element );

					}

				}

				return postProcess( buffer );

			} //


			let geometry;
			const scope = this;

			if ( data instanceof ArrayBuffer ) {

				const text = THREE.LoaderUtils.decodeText( new Uint8Array( data ) );
				const header = parseHeader( text );
				geometry = header.format === 'ascii' ? parseASCII( text, header ) : parseBinary( data, header );

			} else {

				geometry = parseASCII( data, parseHeader( data ) );

			}

			return geometry;

		}

	}

	THREE.PLYLoader = PLYLoader;

} )();