添加关照、全局等高线、修改图层问题

static/sdk/three/jsm/exporters/STLExporter.js

@@ -0,0 +1,199 @@
+import { Vector3 } from 'three';
+
+/**
+ * Usage:
+ *  const exporter = new STLExporter();
+ *
+ *  // second argument is a list of options
+ *  const data = exporter.parse( mesh, { binary: true } );
+ *
+ */
+
+class STLExporter {
+
+	parse( scene, options = {} ) {
+
+		options = Object.assign( {
+			binary: false
+		}, options );
+
+		const binary = options.binary;
+
+		//
+
+		const objects = [];
+		let triangles = 0;
+
+		scene.traverse( function ( object ) {
+
+			if ( object.isMesh ) {
+
+				const geometry = object.geometry;
+
+				const index = geometry.index;
+				const positionAttribute = geometry.getAttribute( 'position' );
+
+				triangles += ( index !== null ) ? ( index.count / 3 ) : ( positionAttribute.count / 3 );
+
+				objects.push( {
+					object3d: object,
+					geometry: geometry
+				} );
+
+			}
+
+		} );
+
+		let output;
+		let offset = 80; // skip header
+
+		if ( binary === true ) {
+
+			const bufferLength = triangles * 2 + triangles * 3 * 4 * 4 + 80 + 4;
+			const arrayBuffer = new ArrayBuffer( bufferLength );
+			output = new DataView( arrayBuffer );
+			output.setUint32( offset, triangles, true ); offset += 4;
+
+		} else {
+
+			output = '';
+			output += 'solid exported\n';
+
+		}
+
+		const vA = new Vector3();
+		const vB = new Vector3();
+		const vC = new Vector3();
+		const cb = new Vector3();
+		const ab = new Vector3();
+		const normal = new Vector3();
+
+		for ( let i = 0, il = objects.length; i < il; i ++ ) {
+
+			const object = objects[ i ].object3d;
+			const geometry = objects[ i ].geometry;
+
+			const index = geometry.index;
+			const positionAttribute = geometry.getAttribute( 'position' );
+
+			if ( index !== null ) {
+
+				// indexed geometry
+
+				for ( let j = 0; j < index.count; j += 3 ) {
+
+					const a = index.getX( j + 0 );
+					const b = index.getX( j + 1 );
+					const c = index.getX( j + 2 );
+
+					writeFace( a, b, c, positionAttribute, object );
+
+				}
+
+			} else {
+
+				// non-indexed geometry
+
+				for ( let j = 0; j < positionAttribute.count; j += 3 ) {
+
+					const a = j + 0;
+					const b = j + 1;
+					const c = j + 2;
+
+					writeFace( a, b, c, positionAttribute, object );
+
+				}
+
+			}
+
+		}
+
+		if ( binary === false ) {
+
+			output += 'endsolid exported\n';
+
+		}
+
+		return output;
+
+		function writeFace( a, b, c, positionAttribute, object ) {
+
+			vA.fromBufferAttribute( positionAttribute, a );
+			vB.fromBufferAttribute( positionAttribute, b );
+			vC.fromBufferAttribute( positionAttribute, c );
+
+			if ( object.isSkinnedMesh === true ) {
+
+				object.applyBoneTransform( a, vA );
+				object.applyBoneTransform( b, vB );
+				object.applyBoneTransform( c, vC );
+
+			}
+
+			vA.applyMatrix4( object.matrixWorld );
+			vB.applyMatrix4( object.matrixWorld );
+			vC.applyMatrix4( object.matrixWorld );
+
+			writeNormal( vA, vB, vC );
+
+			writeVertex( vA );
+			writeVertex( vB );
+			writeVertex( vC );
+
+			if ( binary === true ) {
+
+				output.setUint16( offset, 0, true ); offset += 2;
+
+			} else {
+
+				output += '\t\tendloop\n';
+				output += '\tendfacet\n';
+
+			}
+
+		}
+
+		function writeNormal( vA, vB, vC ) {
+
+			cb.subVectors( vC, vB );
+			ab.subVectors( vA, vB );
+			cb.cross( ab ).normalize();
+
+			normal.copy( cb ).normalize();
+
+			if ( binary === true ) {
+
+				output.setFloat32( offset, normal.x, true ); offset += 4;
+				output.setFloat32( offset, normal.y, true ); offset += 4;
+				output.setFloat32( offset, normal.z, true ); offset += 4;
+
+			} else {
+
+				output += '\tfacet normal ' + normal.x + ' ' + normal.y + ' ' + normal.z + '\n';
+				output += '\t\touter loop\n';
+
+			}
+
+		}
+
+		function writeVertex( vertex ) {
+
+			if ( binary === true ) {
+
+				output.setFloat32( offset, vertex.x, true ); offset += 4;
+				output.setFloat32( offset, vertex.y, true ); offset += 4;
+				output.setFloat32( offset, vertex.z, true ); offset += 4;
+
+			} else {
+
+				output += '\t\t\tvertex ' + vertex.x + ' ' + vertex.y + ' ' + vertex.z + '\n';
+
+			}
+
+		}
+
+	}
+
+}
+
+export { STLExporter };