修改静态资源文件夹位置

public/sdk/three/jsm/modifiers/EdgeSplitModifier.js

@@ -0,0 +1,279 @@
+import {
+	BufferAttribute,
+	BufferGeometry,
+	Vector3
+} from 'three';
+import * as BufferGeometryUtils from '../utils/BufferGeometryUtils.js';
+
+const _A = new Vector3();
+const _B = new Vector3();
+const _C = new Vector3();
+
+class EdgeSplitModifier {
+
+	modify( geometry, cutOffAngle, tryKeepNormals = true ) {
+
+		function computeNormals() {
+
+			normals = new Float32Array( indexes.length * 3 );
+
+			for ( let i = 0; i < indexes.length; i += 3 ) {
+
+				let index = indexes[ i ];
+
+				_A.set(
+					positions[ 3 * index ],
+					positions[ 3 * index + 1 ],
+					positions[ 3 * index + 2 ] );
+
+				index = indexes[ i + 1 ];
+				_B.set(
+					positions[ 3 * index ],
+					positions[ 3 * index + 1 ],
+					positions[ 3 * index + 2 ] );
+
+				index = indexes[ i + 2 ];
+				_C.set(
+					positions[ 3 * index ],
+					positions[ 3 * index + 1 ],
+					positions[ 3 * index + 2 ] );
+
+				_C.sub( _B );
+				_A.sub( _B );
+
+				const normal = _C.cross( _A ).normalize();
+
+				for ( let j = 0; j < 3; j ++ ) {
+
+					normals[ 3 * ( i + j ) ] = normal.x;
+					normals[ 3 * ( i + j ) + 1 ] = normal.y;
+					normals[ 3 * ( i + j ) + 2 ] = normal.z;
+
+				}
+
+			}
+
+		}
+
+
+		function mapPositionsToIndexes() {
+
+			pointToIndexMap = Array( positions.length / 3 );
+
+			for ( let i = 0; i < indexes.length; i ++ ) {
+
+				const index = indexes[ i ];
+
+				if ( pointToIndexMap[ index ] == null ) {
+
+					pointToIndexMap[ index ] = [];
+
+				}
+
+				pointToIndexMap[ index ].push( i );
+
+			}
+
+		}
+
+
+		function edgeSplitToGroups( indexes, cutOff, firstIndex ) {
+
+			_A.set( normals[ 3 * firstIndex ], normals[ 3 * firstIndex + 1 ], normals[ 3 * firstIndex + 2 ] ).normalize();
+
+			const result = {
+				splitGroup: [],
+				currentGroup: [ firstIndex ]
+			};
+
+			for ( const j of indexes ) {
+
+				if ( j !== firstIndex ) {
+
+					_B.set( normals[ 3 * j ], normals[ 3 * j + 1 ], normals[ 3 * j + 2 ] ).normalize();
+
+					if ( _B.dot( _A ) < cutOff ) {
+
+						result.splitGroup.push( j );
+
+					} else {
+
+						result.currentGroup.push( j );
+
+					}
+
+				}
+
+			}
+
+			return result;
+
+		}
+
+
+		function edgeSplit( indexes, cutOff, original = null ) {
+
+			if ( indexes.length === 0 ) return;
+
+			const groupResults = [];
+
+			for ( const index of indexes ) {
+
+				groupResults.push( edgeSplitToGroups( indexes, cutOff, index ) );
+
+			}
+
+			let result = groupResults[ 0 ];
+
+			for ( const groupResult of groupResults ) {
+
+				if ( groupResult.currentGroup.length > result.currentGroup.length ) {
+
+					result = groupResult;
+
+				}
+
+			}
+
+
+			if ( original != null ) {
+
+				splitIndexes.push( {
+					original: original,
+					indexes: result.currentGroup
+				} );
+
+			}
+
+			if ( result.splitGroup.length ) {
+
+				edgeSplit( result.splitGroup, cutOff, original || result.currentGroup[ 0 ] );
+
+			}
+
+		}
+
+		let hadNormals = false;
+		let oldNormals = null;
+
+		if ( geometry.attributes.normal ) {
+
+			hadNormals = true;
+
+			geometry = geometry.clone();
+
+			if ( tryKeepNormals === true && geometry.index !== null ) {
+
+				oldNormals = geometry.attributes.normal.array;
+
+			}
+
+			geometry.deleteAttribute( 'normal' );
+
+		}
+
+		if ( geometry.index == null ) {
+
+			geometry = BufferGeometryUtils.mergeVertices( geometry );
+
+		}
+
+		const indexes = geometry.index.array;
+		const positions = geometry.getAttribute( 'position' ).array;
+
+		let normals;
+		let pointToIndexMap;
+
+		computeNormals();
+		mapPositionsToIndexes();
+
+		const splitIndexes = [];
+
+		for ( const vertexIndexes of pointToIndexMap ) {
+
+			edgeSplit( vertexIndexes, Math.cos( cutOffAngle ) - 0.001 );
+
+		}
+
+		const newAttributes = {};
+		for ( const name of Object.keys( geometry.attributes ) ) {
+
+			const oldAttribute = geometry.attributes[ name ];
+			const newArray = new oldAttribute.array.constructor( ( indexes.length + splitIndexes.length ) * oldAttribute.itemSize );
+			newArray.set( oldAttribute.array );
+			newAttributes[ name ] = new BufferAttribute( newArray, oldAttribute.itemSize, oldAttribute.normalized );
+
+		}
+
+		const newIndexes = new Uint32Array( indexes.length );
+		newIndexes.set( indexes );
+
+		for ( let i = 0; i < splitIndexes.length; i ++ ) {
+
+			const split = splitIndexes[ i ];
+			const index = indexes[ split.original ];
+
+			for ( const attribute of Object.values( newAttributes ) ) {
+
+				for ( let j = 0; j < attribute.itemSize; j ++ ) {
+
+					attribute.array[ ( indexes.length + i ) * attribute.itemSize + j ] =
+						attribute.array[ index * attribute.itemSize + j ];
+
+				}
+
+			}
+
+			for ( const j of split.indexes ) {
+
+				newIndexes[ j ] = indexes.length + i;
+
+			}
+
+		}
+
+		geometry = new BufferGeometry();
+		geometry.setIndex( new BufferAttribute( newIndexes, 1 ) );
+
+		for ( const name of Object.keys( newAttributes ) ) {
+
+			geometry.setAttribute( name, newAttributes[ name ] );
+
+		}
+
+		if ( hadNormals ) {
+
+			geometry.computeVertexNormals();
+
+			if ( oldNormals !== null ) {
+
+				const changedNormals = new Array( oldNormals.length / 3 ).fill( false );
+
+				for ( const splitData of splitIndexes )
+					changedNormals[ splitData.original ] = true;
+
+				for ( let i = 0; i < changedNormals.length; i ++ ) {
+
+					if ( changedNormals[ i ] === false ) {
+
+						for ( let j = 0; j < 3; j ++ )
+							geometry.attributes.normal.array[ 3 * i + j ] = oldNormals[ 3 * i + j ];
+
+					}
+
+				}
+
+
+			}
+
+		}
+
+		return geometry;
+
+	}
+
+}
+
+
+
+export { EdgeSplitModifier };