添加关照、全局等高线、修改图层问题

dist/electron/static/sdk/three/jsm/loaders/STLLoader.js

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+import {
+	BufferAttribute,
+	BufferGeometry,
+	Color,
+	FileLoader,
+	Float32BufferAttribute,
+	Loader,
+	Vector3
+} from 'three';
+
+/**
+ * Description: A THREE loader for STL ASCII files, as created by Solidworks and other CAD programs.
+ *
+ * Supports both binary and ASCII encoded files, with automatic detection of type.
+ *
+ * The loader returns a non-indexed buffer geometry.
+ *
+ * Limitations:
+ *  Binary decoding supports "Magics" color format (http://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL).
+ *  There is perhaps some question as to how valid it is to always assume little-endian-ness.
+ *  ASCII decoding assumes file is UTF-8.
+ *
+ * Usage:
+ *  const loader = new STLLoader();
+ *  loader.load( './models/stl/slotted_disk.stl', function ( geometry ) {
+ *    scene.add( new THREE.Mesh( geometry ) );
+ *  });
+ *
+ * For binary STLs geometry might contain colors for vertices. To use it:
+ *  // use the same code to load STL as above
+ *  if (geometry.hasColors) {
+ *    material = new THREE.MeshPhongMaterial({ opacity: geometry.alpha, vertexColors: true });
+ *  } else { .... }
+ *  const mesh = new THREE.Mesh( geometry, material );
+ *
+ * For ASCII STLs containing multiple solids, each solid is assigned to a different group.
+ * Groups can be used to assign a different color by defining an array of materials with the same length of
+ * geometry.groups and passing it to the Mesh constructor:
+ *
+ * const mesh = new THREE.Mesh( geometry, material );
+ *
+ * For example:
+ *
+ *  const materials = [];
+ *  const nGeometryGroups = geometry.groups.length;
+ *
+ *  const colorMap = ...; // Some logic to index colors.
+ *
+ *  for (let i = 0; i < nGeometryGroups; i++) {
+ *
+ *		const material = new THREE.MeshPhongMaterial({
+ *			color: colorMap[i],
+ *			wireframe: false
+ *		});
+ *
+ *  }
+ *
+ *  materials.push(material);
+ *  const mesh = new THREE.Mesh(geometry, materials);
+ */
+
+
+class STLLoader extends Loader {
+
+	constructor( manager ) {
+
+		super( manager );
+
+	}
+
+	load( url, onLoad, onProgress, onError ) {
+
+		const scope = this;
+
+		const loader = new 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 );
+
+	}
+
+	parse( data ) {
+
+		function isBinary( data ) {
+
+			const reader = new DataView( data );
+			const face_size = ( 32 / 8 * 3 ) + ( ( 32 / 8 * 3 ) * 3 ) + ( 16 / 8 );
+			const n_faces = reader.getUint32( 80, true );
+			const expect = 80 + ( 32 / 8 ) + ( n_faces * face_size );
+
+			if ( expect === reader.byteLength ) {
+
+				return true;
+
+			}
+
+			// An ASCII STL data must begin with 'solid ' as the first six bytes.
+			// However, ASCII STLs lacking the SPACE after the 'd' are known to be
+			// plentiful.  So, check the first 5 bytes for 'solid'.
+
+			// Several encodings, such as UTF-8, precede the text with up to 5 bytes:
+			// https://en.wikipedia.org/wiki/Byte_order_mark#Byte_order_marks_by_encoding
+			// Search for "solid" to start anywhere after those prefixes.
+
+			// US-ASCII ordinal values for 's', 'o', 'l', 'i', 'd'
+
+			const solid = [ 115, 111, 108, 105, 100 ];
+
+			for ( let off = 0; off < 5; off ++ ) {
+
+				// If "solid" text is matched to the current offset, declare it to be an ASCII STL.
+
+				if ( matchDataViewAt( solid, reader, off ) ) return false;
+
+			}
+
+			// Couldn't find "solid" text at the beginning; it is binary STL.
+
+			return true;
+
+		}
+
+		function matchDataViewAt( query, reader, offset ) {
+
+			// Check if each byte in query matches the corresponding byte from the current offset
+
+			for ( let i = 0, il = query.length; i < il; i ++ ) {
+
+				if ( query[ i ] !== reader.getUint8( offset + i ) ) return false;
+
+			}
+
+			return true;
+
+		}
+
+		function parseBinary( data ) {
+
+			const reader = new DataView( data );
+			const faces = reader.getUint32( 80, true );
+
+			let r, g, b, hasColors = false, colors;
+			let defaultR, defaultG, defaultB, alpha;
+
+			// process STL header
+			// check for default color in header ("COLOR=rgba" sequence).
+
+			for ( let index = 0; index < 80 - 10; index ++ ) {
+
+				if ( ( reader.getUint32( index, false ) == 0x434F4C4F /*COLO*/ ) &&
+					( reader.getUint8( index + 4 ) == 0x52 /*'R'*/ ) &&
+					( reader.getUint8( index + 5 ) == 0x3D /*'='*/ ) ) {
+
+					hasColors = true;
+					colors = new Float32Array( faces * 3 * 3 );
+
+					defaultR = reader.getUint8( index + 6 ) / 255;
+					defaultG = reader.getUint8( index + 7 ) / 255;
+					defaultB = reader.getUint8( index + 8 ) / 255;
+					alpha = reader.getUint8( index + 9 ) / 255;
+
+				}
+
+			}
+
+			const dataOffset = 84;
+			const faceLength = 12 * 4 + 2;
+
+			const geometry = new BufferGeometry();
+
+			const vertices = new Float32Array( faces * 3 * 3 );
+			const normals = new Float32Array( faces * 3 * 3 );
+
+			const color = new Color();
+
+			for ( let face = 0; face < faces; face ++ ) {
+
+				const start = dataOffset + face * faceLength;
+				const normalX = reader.getFloat32( start, true );
+				const normalY = reader.getFloat32( start + 4, true );
+				const normalZ = reader.getFloat32( start + 8, true );
+
+				if ( hasColors ) {
+
+					const packedColor = reader.getUint16( start + 48, true );
+
+					if ( ( packedColor & 0x8000 ) === 0 ) {
+
+						// facet has its own unique color
+
+						r = ( packedColor & 0x1F ) / 31;
+						g = ( ( packedColor >> 5 ) & 0x1F ) / 31;
+						b = ( ( packedColor >> 10 ) & 0x1F ) / 31;
+
+					} else {
+
+						r = defaultR;
+						g = defaultG;
+						b = defaultB;
+
+					}
+
+				}
+
+				for ( let i = 1; i <= 3; i ++ ) {
+
+					const vertexstart = start + i * 12;
+					const componentIdx = ( face * 3 * 3 ) + ( ( i - 1 ) * 3 );
+
+					vertices[ componentIdx ] = reader.getFloat32( vertexstart, true );
+					vertices[ componentIdx + 1 ] = reader.getFloat32( vertexstart + 4, true );
+					vertices[ componentIdx + 2 ] = reader.getFloat32( vertexstart + 8, true );
+
+					normals[ componentIdx ] = normalX;
+					normals[ componentIdx + 1 ] = normalY;
+					normals[ componentIdx + 2 ] = normalZ;
+
+					if ( hasColors ) {
+
+						color.set( r, g, b ).convertSRGBToLinear();
+
+						colors[ componentIdx ] = color.r;
+						colors[ componentIdx + 1 ] = color.g;
+						colors[ componentIdx + 2 ] = color.b;
+
+					}
+
+				}
+
+			}
+
+			geometry.setAttribute( 'position', new BufferAttribute( vertices, 3 ) );
+			geometry.setAttribute( 'normal', new BufferAttribute( normals, 3 ) );
+
+			if ( hasColors ) {
+
+				geometry.setAttribute( 'color', new BufferAttribute( colors, 3 ) );
+				geometry.hasColors = true;
+				geometry.alpha = alpha;
+
+			}
+
+			return geometry;
+
+		}
+
+		function parseASCII( data ) {
+
+			const geometry = new BufferGeometry();
+			const patternSolid = /solid([\s\S]*?)endsolid/g;
+			const patternFace = /facet([\s\S]*?)endfacet/g;
+			const patternName = /solid\s(.+)/;
+			let faceCounter = 0;
+
+			const patternFloat = /[\s]+([+-]?(?:\d*)(?:\.\d*)?(?:[eE][+-]?\d+)?)/.source;
+			const patternVertex = new RegExp( 'vertex' + patternFloat + patternFloat + patternFloat, 'g' );
+			const patternNormal = new RegExp( 'normal' + patternFloat + patternFloat + patternFloat, 'g' );
+
+			const vertices = [];
+			const normals = [];
+			const groupNames = [];
+
+			const normal = new Vector3();
+
+			let result;
+
+			let groupCount = 0;
+			let startVertex = 0;
+			let endVertex = 0;
+
+			while ( ( result = patternSolid.exec( data ) ) !== null ) {
+
+				startVertex = endVertex;
+
+				const solid = result[ 0 ];
+
+				const name = ( result = patternName.exec( solid ) ) !== null ? result[ 1 ] : '';
+				groupNames.push( name );
+
+				while ( ( result = patternFace.exec( solid ) ) !== null ) {
+
+					let vertexCountPerFace = 0;
+					let normalCountPerFace = 0;
+
+					const text = result[ 0 ];
+
+					while ( ( result = patternNormal.exec( text ) ) !== null ) {
+
+						normal.x = parseFloat( result[ 1 ] );
+						normal.y = parseFloat( result[ 2 ] );
+						normal.z = parseFloat( result[ 3 ] );
+						normalCountPerFace ++;
+
+					}
+
+					while ( ( result = patternVertex.exec( text ) ) !== null ) {
+
+						vertices.push( parseFloat( result[ 1 ] ), parseFloat( result[ 2 ] ), parseFloat( result[ 3 ] ) );
+						normals.push( normal.x, normal.y, normal.z );
+						vertexCountPerFace ++;
+						endVertex ++;
+
+					}
+
+					// every face have to own ONE valid normal
+
+					if ( normalCountPerFace !== 1 ) {
+
+						console.error( 'THREE.STLLoader: Something isn\'t right with the normal of face number ' + faceCounter );
+
+					}
+
+					// each face have to own THREE valid vertices
+
+					if ( vertexCountPerFace !== 3 ) {
+
+						console.error( 'THREE.STLLoader: Something isn\'t right with the vertices of face number ' + faceCounter );
+
+					}
+
+					faceCounter ++;
+
+				}
+
+				const start = startVertex;
+				const count = endVertex - startVertex;
+
+				geometry.userData.groupNames = groupNames;
+
+				geometry.addGroup( start, count, groupCount );
+				groupCount ++;
+
+			}
+
+			geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+			geometry.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
+
+			return geometry;
+
+		}
+
+		function ensureString( buffer ) {
+
+			if ( typeof buffer !== 'string' ) {
+
+				return new TextDecoder().decode( buffer );
+
+			}
+
+			return buffer;
+
+		}
+
+		function ensureBinary( buffer ) {
+
+			if ( typeof buffer === 'string' ) {
+
+				const array_buffer = new Uint8Array( buffer.length );
+				for ( let i = 0; i < buffer.length; i ++ ) {
+
+					array_buffer[ i ] = buffer.charCodeAt( i ) & 0xff; // implicitly assumes little-endian
+
+				}
+
+				return array_buffer.buffer || array_buffer;
+
+			} else {
+
+				return buffer;
+
+			}
+
+		}
+
+		// start
+
+		const binData = ensureBinary( data );
+
+		return isBinary( binData ) ? parseBinary( binData ) : parseASCII( ensureString( data ) );
+
+	}
+
+}
+
+export { STLLoader };