添加关照、全局等高线、修改图层问题

static/sdk/three/jsm/utils/LDrawUtils.js

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+import {
+	BufferAttribute,
+	BufferGeometry,
+	Group,
+	LineSegments,
+	Matrix3,
+	Mesh
+} from 'three';
+
+import { mergeGeometries } from './BufferGeometryUtils.js';
+
+class LDrawUtils {
+
+	static mergeObject( object ) {
+
+		// Merges geometries in object by materials and returns new object. Use on not indexed geometries.
+		// The object buffers reference the old object ones.
+		// Special treatment is done to the conditional lines generated by LDrawLoader.
+
+		function extractGroup( geometry, group, elementSize, isConditionalLine ) {
+
+			// Extracts a group from a geometry as a new geometry (with attribute buffers referencing original buffers)
+
+			const newGeometry = new BufferGeometry();
+
+			const originalPositions = geometry.getAttribute( 'position' ).array;
+			const originalNormals = elementSize === 3 ? geometry.getAttribute( 'normal' ).array : null;
+
+			const numVertsGroup = Math.min( group.count, Math.floor( originalPositions.length / 3 ) - group.start );
+			const vertStart = group.start * 3;
+			const vertEnd = ( group.start + numVertsGroup ) * 3;
+
+			const positions = originalPositions.subarray( vertStart, vertEnd );
+			const normals = originalNormals !== null ? originalNormals.subarray( vertStart, vertEnd ) : null;
+
+			newGeometry.setAttribute( 'position', new BufferAttribute( positions, 3 ) );
+			if ( normals !== null ) newGeometry.setAttribute( 'normal', new BufferAttribute( normals, 3 ) );
+
+			if ( isConditionalLine ) {
+
+				const controlArray0 = geometry.getAttribute( 'control0' ).array.subarray( vertStart, vertEnd );
+				const controlArray1 = geometry.getAttribute( 'control1' ).array.subarray( vertStart, vertEnd );
+				const directionArray = geometry.getAttribute( 'direction' ).array.subarray( vertStart, vertEnd );
+
+				newGeometry.setAttribute( 'control0', new BufferAttribute( controlArray0, 3, false ) );
+				newGeometry.setAttribute( 'control1', new BufferAttribute( controlArray1, 3, false ) );
+				newGeometry.setAttribute( 'direction', new BufferAttribute( directionArray, 3, false ) );
+
+			}
+
+			return newGeometry;
+
+		}
+
+		function addGeometry( mat, geometry, geometries ) {
+
+			const geoms = geometries[ mat.uuid ];
+			if ( ! geoms ) {
+
+				geometries[ mat.uuid ] = {
+					mat: mat,
+					arr: [ geometry ]
+				};
+
+			} else {
+
+				geoms.arr.push( geometry );
+
+			}
+
+		}
+
+		function permuteAttribute( attribute, elemSize ) {
+
+			// Permutes first two vertices of each attribute element
+
+			if ( ! attribute ) return;
+
+			const verts = attribute.array;
+			const numVerts = Math.floor( verts.length / 3 );
+			let offset = 0;
+			for ( let i = 0; i < numVerts; i ++ ) {
+
+				const x = verts[ offset ];
+				const y = verts[ offset + 1 ];
+				const z = verts[ offset + 2 ];
+
+				verts[ offset ] = verts[ offset + 3 ];
+				verts[ offset + 1 ] = verts[ offset + 4 ];
+				verts[ offset + 2 ] = verts[ offset + 5 ];
+
+				verts[ offset + 3 ] = x;
+				verts[ offset + 4 ] = y;
+				verts[ offset + 5 ] = z;
+
+				offset += elemSize * 3;
+
+			}
+
+		}
+
+		// Traverse the object hierarchy collecting geometries and transforming them to world space
+
+		const meshGeometries = {};
+		const linesGeometries = {};
+		const condLinesGeometries = {};
+
+		object.updateMatrixWorld( true );
+		const normalMatrix = new Matrix3();
+
+		object.traverse( c => {
+
+			if ( c.isMesh | c.isLineSegments ) {
+
+				const elemSize = c.isMesh ? 3 : 2;
+
+				const geometry = c.geometry.clone();
+				const matrixIsInverted = c.matrixWorld.determinant() < 0;
+				if ( matrixIsInverted ) {
+
+					permuteAttribute( geometry.attributes.position, elemSize );
+					permuteAttribute( geometry.attributes.normal, elemSize );
+
+				}
+
+				geometry.applyMatrix4( c.matrixWorld );
+
+				if ( c.isConditionalLine ) {
+
+					geometry.attributes.control0.applyMatrix4( c.matrixWorld );
+					geometry.attributes.control1.applyMatrix4( c.matrixWorld );
+					normalMatrix.getNormalMatrix( c.matrixWorld );
+					geometry.attributes.direction.applyNormalMatrix( normalMatrix );
+
+				}
+
+				const geometries = c.isMesh ? meshGeometries : ( c.isConditionalLine ? condLinesGeometries : linesGeometries );
+
+				if ( Array.isArray( c.material ) ) {
+
+					for ( const groupIndex in geometry.groups ) {
+
+						const group = geometry.groups[ groupIndex ];
+						const mat = c.material[ group.materialIndex ];
+						const newGeometry = extractGroup( geometry, group, elemSize, c.isConditionalLine );
+						addGeometry( mat, newGeometry, geometries );
+
+					}
+
+				} else {
+
+					addGeometry( c.material, geometry, geometries );
+
+				}
+
+			}
+
+		} );
+
+		// Create object with merged geometries
+
+		const mergedObject = new Group();
+
+		const meshMaterialsIds = Object.keys( meshGeometries );
+		for ( const meshMaterialsId of meshMaterialsIds ) {
+
+			const meshGeometry = meshGeometries[ meshMaterialsId ];
+			const mergedGeometry = mergeGeometries( meshGeometry.arr );
+			mergedObject.add( new Mesh( mergedGeometry, meshGeometry.mat ) );
+
+		}
+
+		const linesMaterialsIds = Object.keys( linesGeometries );
+		for ( const linesMaterialsId of linesMaterialsIds ) {
+
+			const lineGeometry = linesGeometries[ linesMaterialsId ];
+			const mergedGeometry = mergeGeometries( lineGeometry.arr );
+			mergedObject.add( new LineSegments( mergedGeometry, lineGeometry.mat ) );
+
+		}
+
+		const condLinesMaterialsIds = Object.keys( condLinesGeometries );
+		for ( const condLinesMaterialsId of condLinesMaterialsIds ) {
+
+			const condLineGeometry = condLinesGeometries[ condLinesMaterialsId ];
+			const mergedGeometry = mergeGeometries( condLineGeometry.arr );
+			const condLines = new LineSegments( mergedGeometry, condLineGeometry.mat );
+			condLines.isConditionalLine = true;
+			mergedObject.add( condLines );
+
+		}
+
+		mergedObject.userData.constructionStep = 0;
+		mergedObject.userData.numConstructionSteps = 1;
+
+		return mergedObject;
+
+	}
+
+}
+
+export { LDrawUtils };