main repo

node_modules/three/examples/jsm/modifiers/CurveModifier.js

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+// Original src: https://github.com/zz85/threejs-path-flow
+const CHANNELS = 4;
+const TEXTURE_WIDTH = 1024;
+const TEXTURE_HEIGHT = 4;
+
+import {
+	DataTexture,
+	DataUtils,
+	RGBAFormat,
+	HalfFloatType,
+	RepeatWrapping,
+	Mesh,
+	InstancedMesh,
+	LinearFilter,
+	DynamicDrawUsage,
+	Matrix4
+} from 'three';
+
+/**
+ * Make a new DataTexture to store the descriptions of the curves.
+ *
+ * @private
+ * @param {number} numberOfCurves - The number of curves needed to be described by this texture.
+ * @returns {DataTexture}
+ */
+function initSplineTexture( numberOfCurves = 1 ) {
+
+	const dataArray = new Uint16Array( TEXTURE_WIDTH * TEXTURE_HEIGHT * numberOfCurves * CHANNELS );
+	const dataTexture = new DataTexture(
+		dataArray,
+		TEXTURE_WIDTH,
+		TEXTURE_HEIGHT * numberOfCurves,
+		RGBAFormat,
+		HalfFloatType
+	);
+
+	dataTexture.wrapS = RepeatWrapping;
+	dataTexture.wrapY = RepeatWrapping;
+	dataTexture.magFilter = LinearFilter;
+	dataTexture.minFilter = LinearFilter;
+	dataTexture.needsUpdate = true;
+
+	return dataTexture;
+
+}
+
+/**
+ * Write the curve description to the data texture.
+ *
+ * @private
+ * @param {DataTexture} texture - The data texture to write to.
+ * @param {Curve} splineCurve - The curve to describe.
+ * @param {number} offset - Which curve slot to write to.
+ */
+function updateSplineTexture( texture, splineCurve, offset = 0 ) {
+
+	const numberOfPoints = Math.floor( TEXTURE_WIDTH * ( TEXTURE_HEIGHT / 4 ) );
+	splineCurve.arcLengthDivisions = numberOfPoints / 2;
+	splineCurve.updateArcLengths();
+	const points = splineCurve.getSpacedPoints( numberOfPoints );
+	const frenetFrames = splineCurve.computeFrenetFrames( numberOfPoints, true );
+
+	for ( let i = 0; i < numberOfPoints; i ++ ) {
+
+		const rowOffset = Math.floor( i / TEXTURE_WIDTH );
+		const rowIndex = i % TEXTURE_WIDTH;
+
+		let pt = points[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 0 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.tangents[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 1 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.normals[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 2 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.binormals[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 3 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+
+	}
+
+	texture.needsUpdate = true;
+
+}
+
+function setTextureValue( texture, index, x, y, z, o ) {
+
+	const image = texture.image;
+	const { data } = image;
+	const i = CHANNELS * TEXTURE_WIDTH * o; // Row Offset
+	data[ index * CHANNELS + i + 0 ] = DataUtils.toHalfFloat( x );
+	data[ index * CHANNELS + i + 1 ] = DataUtils.toHalfFloat( y );
+	data[ index * CHANNELS + i + 2 ] = DataUtils.toHalfFloat( z );
+	data[ index * CHANNELS + i + 3 ] = DataUtils.toHalfFloat( 1 );
+
+}
+
+/**
+ * Create a new set of uniforms for describing the curve modifier.
+ *
+ * @param {DataTexture} splineTexture - Which holds the curve description.
+ * @returns {Object} The uniforms object to be used in the shader.
+ */
+function getUniforms( splineTexture ) {
+
+	const uniforms = {
+		spineTexture: { value: splineTexture },
+		pathOffset: { type: 'f', value: 0 }, // time of path curve
+		pathSegment: { type: 'f', value: 1 }, // fractional length of path
+		spineOffset: { type: 'f', value: 161 },
+		spineLength: { type: 'f', value: 400 },
+		flow: { type: 'i', value: 1 },
+	};
+	return uniforms;
+
+}
+
+function modifyShader( material, uniforms, numberOfCurves = 1 ) {
+
+	if ( material.__ok ) return;
+	material.__ok = true;
+
+	material.onBeforeCompile = ( shader ) => {
+
+		if ( shader.__modified ) return;
+		shader.__modified = true;
+
+		Object.assign( shader.uniforms, uniforms );
+
+		const vertexShader = `
+		uniform sampler2D spineTexture;
+		uniform float pathOffset;
+		uniform float pathSegment;
+		uniform float spineOffset;
+		uniform float spineLength;
+		uniform int flow;
+
+		float textureLayers = ${TEXTURE_HEIGHT * numberOfCurves}.;
+		float textureStacks = ${TEXTURE_HEIGHT / 4}.;
+
+		${shader.vertexShader}
+		`
+		// chunk import moved in front of modified shader below
+			.replace( '#include <beginnormal_vertex>', '' )
+
+			// vec3 transformedNormal declaration overridden below
+			.replace( '#include <defaultnormal_vertex>', '' )
+
+			// vec3 transformed declaration overridden below
+			.replace( '#include <begin_vertex>', '' )
+
+			// shader override
+			.replace(
+				/void\s*main\s*\(\)\s*\{/,
+				`
+void main() {
+#include <beginnormal_vertex>
+
+vec4 worldPos = modelMatrix * vec4(position, 1.);
+
+bool bend = flow > 0;
+float xWeight = bend ? 0. : 1.;
+
+#ifdef USE_INSTANCING
+float pathOffsetFromInstanceMatrix = instanceMatrix[3][2];
+float spineLengthFromInstanceMatrix = instanceMatrix[3][0];
+float spinePortion = bend ? (worldPos.x + spineOffset) / spineLengthFromInstanceMatrix : 0.;
+float mt = (spinePortion * pathSegment + pathOffset + pathOffsetFromInstanceMatrix)*textureStacks;
+#else
+float spinePortion = bend ? (worldPos.x + spineOffset) / spineLength : 0.;
+float mt = (spinePortion * pathSegment + pathOffset)*textureStacks;
+#endif
+
+mt = mod(mt, textureStacks);
+float rowOffset = floor(mt);
+
+#ifdef USE_INSTANCING
+rowOffset += instanceMatrix[3][1] * ${TEXTURE_HEIGHT}.;
+#endif
+
+vec3 spinePos = texture2D(spineTexture, vec2(mt, (0. + rowOffset + 0.5) / textureLayers)).xyz;
+vec3 a =        texture2D(spineTexture, vec2(mt, (1. + rowOffset + 0.5) / textureLayers)).xyz;
+vec3 b =        texture2D(spineTexture, vec2(mt, (2. + rowOffset + 0.5) / textureLayers)).xyz;
+vec3 c =        texture2D(spineTexture, vec2(mt, (3. + rowOffset + 0.5) / textureLayers)).xyz;
+mat3 basis = mat3(a, b, c);
+
+vec3 transformed = basis
+	* vec3(worldPos.x * xWeight, worldPos.y * 1., worldPos.z * 1.)
+	+ spinePos;
+
+vec3 transformedNormal = normalMatrix * (basis * objectNormal);
+			` ).replace(
+				'#include <project_vertex>',
+				`vec4 mvPosition = modelViewMatrix * vec4( transformed, 1.0 );
+				gl_Position = projectionMatrix * mvPosition;`
+			);
+
+		shader.vertexShader = vertexShader;
+
+	};
+
+}
+
+/**
+ * A modifier for making meshes bend around curves.
+ *
+ * This module can only be used with {@link WebGLRenderer}. When using {@link WebGPURenderer},
+ * import the class from `CurveModifierGPU.js`.
+ *
+ * @three_import import { Flow } from 'three/addons/modifiers/CurveModifier.js';
+ */
+export class Flow {
+
+	/**
+	 * Constructs a new Flow instance.
+	 *
+	 * @param {Mesh} mesh - The mesh to clone and modify to bend around the curve.
+	 * @param {number} numberOfCurves - The amount of space that should preallocated for additional curves.
+	 */
+	constructor( mesh, numberOfCurves = 1 ) {
+
+		const obj3D = mesh.clone();
+		const splineTexture = initSplineTexture( numberOfCurves );
+		const uniforms = getUniforms( splineTexture );
+		obj3D.traverse( function ( child ) {
+
+			if (
+				child instanceof Mesh ||
+				child instanceof InstancedMesh
+			) {
+
+				if ( Array.isArray( child.material ) ) {
+
+					const materials = [];
+
+					for ( const material of child.material ) {
+
+						const newMaterial = material.clone();
+						modifyShader( newMaterial, uniforms, numberOfCurves );
+						materials.push( newMaterial );
+
+					}
+
+					child.material = materials;
+
+				} else {
+
+					child.material = child.material.clone();
+					modifyShader( child.material, uniforms, numberOfCurves );
+
+				}
+
+			}
+
+		} );
+
+		this.curveArray = new Array( numberOfCurves );
+		this.curveLengthArray = new Array( numberOfCurves );
+
+		this.object3D = obj3D;
+		this.splineTexture = splineTexture;
+		this.uniforms = uniforms;
+
+	}
+
+	/**
+	 * Updates the curve for the given curve index.
+	 *
+	 * @param {number} index - The curve index.
+	 * @param {Curve} curve - The curve that should be used to bend the mesh.
+	 */
+	updateCurve( index, curve ) {
+
+		if ( index >= this.curveArray.length ) throw Error( 'Flow: Index out of range.' );
+		const curveLength = curve.getLength();
+		this.uniforms.spineLength.value = curveLength;
+		this.curveLengthArray[ index ] = curveLength;
+		this.curveArray[ index ] = curve;
+		updateSplineTexture( this.splineTexture, curve, index );
+
+	}
+
+	/**
+	 * Moves the mesh along the curve.
+	 *
+	 * @param {number} amount - The offset.
+	 */
+	moveAlongCurve( amount ) {
+
+		this.uniforms.pathOffset.value += amount;
+
+	}
+
+}
+
+const _matrix = new Matrix4();
+
+/**
+ * An instanced version of {@link Flow} for making meshes bend around curves, where the instances are placed on the curve.
+ *
+ * This module can only be used with {@link WebGLRenderer}.
+ *
+ * @augments Flow
+ * @three_import import { InstancedFlow } from 'three/addons/modifiers/CurveModifier.js';
+ */
+export class InstancedFlow extends Flow {
+
+	/**
+	 * Constructs a new InstancedFlow instance.
+	 *
+	 * @param {number} count - The number of instanced elements.
+	 * @param {number} curveCount - The number of curves to preallocate for.
+	 * @param {Geometry} geometry - The geometry to use for the instanced mesh.
+	 * @param {Material} material - The material to use for the instanced mesh.
+	 */
+	constructor( count, curveCount, geometry, material ) {
+
+		const mesh = new InstancedMesh(
+			geometry,
+			material,
+			count
+		);
+		mesh.instanceMatrix.setUsage( DynamicDrawUsage );
+		mesh.frustumCulled = false;
+		super( mesh, curveCount );
+
+		this.offsets = new Array( count ).fill( 0 );
+		this.whichCurve = new Array( count ).fill( 0 );
+
+	}
+
+	/**
+	 * The extra information about which curve and curve position is stored in the translation components of the matrix for the instanced objects
+	 * This writes that information to the matrix and marks it as needing update.
+	 *
+	 * @param {number} index - The index of tge instanced element to update.
+	 */
+	writeChanges( index ) {
+
+		_matrix.makeTranslation(
+			this.curveLengthArray[ this.whichCurve[ index ] ],
+			this.whichCurve[ index ],
+			this.offsets[ index ]
+		);
+		this.object3D.setMatrixAt( index, _matrix );
+		this.object3D.instanceMatrix.needsUpdate = true;
+
+	}
+
+	/**
+	 * Move an individual element along the curve by a specific amount.
+	 *
+	 * @param {number} index - Which element to update.
+	 * @param {number} offset - The offset.
+	 */
+	moveIndividualAlongCurve( index, offset ) {
+
+		this.offsets[ index ] += offset;
+		this.writeChanges( index );
+
+	}
+
+	/**
+	 * Select which curve to use for an element.
+	 *
+	 * @param {number} index - The index of the instanced element to update.
+	 * @param {number} curveNo - The index of the curve it should use.
+	 */
+	setCurve( index, curveNo ) {
+
+		if ( isNaN( curveNo ) ) throw Error( 'InstancedFlow: Curve index being set is Not a Number (NaN).' );
+		this.whichCurve[ index ] = curveNo;
+		this.writeChanges( index );
+
+	}
+
+}

node_modules/three/examples/jsm/modifiers/CurveModifierGPU.js

@@ -0,0 +1,256 @@
+// Original src: https://github.com/zz85/threejs-path-flow
+const CHANNELS = 4;
+const TEXTURE_WIDTH = 1024;
+const TEXTURE_HEIGHT = 4;
+
+import {
+	DataTexture,
+	DataUtils,
+	RGBAFormat,
+	HalfFloatType,
+	RepeatWrapping,
+	Mesh,
+	InstancedMesh,
+	LinearFilter
+} from 'three';
+
+import { modelWorldMatrix, normalLocal, vec2, vec3, vec4, mat3, varyingProperty, texture, reference, Fn, select, positionLocal } from 'three/tsl';
+
+/**
+ * Make a new DataTexture to store the descriptions of the curves.
+ *
+ * @private
+ * @param {number} [numberOfCurves=1] - The number of curves needed to be described by this texture.
+ * @returns  {DataTexture} The new data texture.
+ */
+function initSplineTexture( numberOfCurves = 1 ) {
+
+	const dataArray = new Uint16Array( TEXTURE_WIDTH * TEXTURE_HEIGHT * numberOfCurves * CHANNELS );
+	const dataTexture = new DataTexture(
+		dataArray,
+		TEXTURE_WIDTH,
+		TEXTURE_HEIGHT * numberOfCurves,
+		RGBAFormat,
+		HalfFloatType
+	);
+
+	dataTexture.wrapS = RepeatWrapping;
+	dataTexture.wrapY = RepeatWrapping;
+	dataTexture.magFilter = LinearFilter;
+	dataTexture.minFilter = LinearFilter;
+	dataTexture.needsUpdate = true;
+
+	return dataTexture;
+
+}
+
+/**
+ * Write the curve description to the data texture.
+ *
+ * @private
+ * @param {DataTexture} texture - The data texture to write to.
+ * @param {Curve} splineCurve - The curve to describe.
+ * @param {number} [offset=0] - Which curve slot to write to.
+ */
+function updateSplineTexture( texture, splineCurve, offset = 0 ) {
+
+	const numberOfPoints = Math.floor( TEXTURE_WIDTH * ( TEXTURE_HEIGHT / 4 ) );
+	splineCurve.arcLengthDivisions = numberOfPoints / 2;
+	splineCurve.updateArcLengths();
+	const points = splineCurve.getSpacedPoints( numberOfPoints );
+	const frenetFrames = splineCurve.computeFrenetFrames( numberOfPoints, true );
+
+	for ( let i = 0; i < numberOfPoints; i ++ ) {
+
+		const rowOffset = Math.floor( i / TEXTURE_WIDTH );
+		const rowIndex = i % TEXTURE_WIDTH;
+
+		let pt = points[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 0 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.tangents[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 1 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.normals[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 2 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+		pt = frenetFrames.binormals[ i ];
+		setTextureValue( texture, rowIndex, pt.x, pt.y, pt.z, 3 + rowOffset + ( TEXTURE_HEIGHT * offset ) );
+
+	}
+
+	texture.needsUpdate = true;
+
+}
+
+
+function setTextureValue( texture, index, x, y, z, o ) {
+
+	const image = texture.image;
+	const { data } = image;
+	const i = CHANNELS * TEXTURE_WIDTH * o; // Row Offset
+
+	data[ index * CHANNELS + i + 0 ] = DataUtils.toHalfFloat( x );
+	data[ index * CHANNELS + i + 1 ] = DataUtils.toHalfFloat( y );
+	data[ index * CHANNELS + i + 2 ] = DataUtils.toHalfFloat( z );
+	data[ index * CHANNELS + i + 3 ] = DataUtils.toHalfFloat( 1 );
+
+}
+
+/**
+ * Create a new set of uniforms for describing the curve modifier.
+ *
+ * @private
+ * @param {DataTexture} splineTexture - Which holds the curve description.
+ * @returns {Object} The uniforms object.
+ */
+function getUniforms( splineTexture ) {
+
+	return {
+		spineTexture: splineTexture,
+		pathOffset: 0, // time of path curve
+		pathSegment: 1, // fractional length of path
+		spineOffset: 161,
+		spineLength: 400,
+		flow: 1, // int
+	};
+
+}
+
+function modifyShader( material, uniforms, numberOfCurves ) {
+
+	const spineTexture = uniforms.spineTexture;
+
+	const pathOffset = reference( 'pathOffset', 'float', uniforms );
+	const pathSegment = reference( 'pathSegment', 'float', uniforms );
+	const spineOffset = reference( 'spineOffset', 'float', uniforms );
+	const spineLength = reference( 'spineLength', 'float', uniforms );
+	const flow = reference( 'flow', 'float', uniforms );
+
+	material.positionNode = Fn( () => {
+
+		const textureStacks = TEXTURE_HEIGHT / 4;
+		const textureScale = TEXTURE_HEIGHT * numberOfCurves;
+
+		const worldPos = modelWorldMatrix.mul( vec4( positionLocal, 1 ) ).toVar();
+
+		const bend = flow.greaterThan( 0 ).toVar();
+		const xWeight = select( bend, 0, 1 ).toVar();
+
+		const spinePortion = select( bend, worldPos.x.add( spineOffset ).div( spineLength ), 0 );
+		const mt = spinePortion.mul( pathSegment ).add( pathOffset ).mul( textureStacks ).toVar();
+
+		mt.assign( mt.mod( textureStacks ) );
+
+		const rowOffset = mt.floor().toVar();
+
+		const spinePos = texture( spineTexture, vec2( mt, rowOffset.add( 0.5 ).div( textureScale ) ) ).xyz;
+
+		const a = texture( spineTexture, vec2( mt, rowOffset.add( 1.5 ).div( textureScale ) ) ).xyz;
+		const b = texture( spineTexture, vec2( mt, rowOffset.add( 2.5 ).div( textureScale ) ) ).xyz;
+		const c = texture( spineTexture, vec2( mt, rowOffset.add( 3.5 ).div( textureScale ) ) ).xyz;
+
+		const basis = mat3( a, b, c ).toVar();
+
+		varyingProperty( 'vec3', 'curveNormal' ).assign( basis.mul( normalLocal ) );
+
+		return basis.mul( vec3( worldPos.x.mul( xWeight ), worldPos.y, worldPos.z ) ).add( spinePos );
+
+	} )();
+
+	material.normalNode = varyingProperty( 'vec3', 'curveNormal' );
+
+}
+
+/**
+ * A modifier for making meshes bend around curves.
+ *
+ * This module can only be used with {@link WebGPURenderer}. When using {@link WebGLRenderer},
+ * import the class from `CurveModifier.js`.
+ *
+ * @three_import import { Flow } from 'three/addons/modifiers/CurveModifierGPU.js';
+ */
+export class Flow {
+
+	/**
+	 * Constructs a new Flow instance.
+	 *
+	 * @param {Mesh} mesh - The mesh to clone and modify to bend around the curve.
+	 * @param {number} numberOfCurves - The amount of space that should preallocated for additional curves.
+	 */
+	constructor( mesh, numberOfCurves = 1 ) {
+
+		const obj3D = mesh.clone();
+		const splineTexture = initSplineTexture( numberOfCurves );
+		const uniforms = getUniforms( splineTexture );
+
+		obj3D.traverse( function ( child ) {
+
+			if (
+				child instanceof Mesh ||
+				child instanceof InstancedMesh
+			) {
+
+				if ( Array.isArray( child.material ) ) {
+
+					const materials = [];
+
+					for ( const material of child.material ) {
+
+						const newMaterial = material.clone();
+						modifyShader( newMaterial, uniforms, numberOfCurves );
+						materials.push( newMaterial );
+
+					}
+
+					child.material = materials;
+
+				} else {
+
+					child.material = child.material.clone();
+					modifyShader( child.material, uniforms, numberOfCurves );
+
+				}
+
+			}
+
+		} );
+
+		this.curveArray = new Array( numberOfCurves );
+		this.curveLengthArray = new Array( numberOfCurves );
+
+		this.object3D = obj3D;
+		this.splineTexture = splineTexture;
+		this.uniforms = uniforms;
+
+	}
+
+	/**
+	 * Updates the curve for the given curve index.
+	 *
+	 * @param {number} index - The curve index.
+	 * @param {Curve} curve - The curve that should be used to bend the mesh.
+	 */
+	updateCurve( index, curve ) {
+
+		if ( index >= this.curveArray.length ) throw Error( 'Flow: Index out of range.' );
+
+		const curveLength = curve.getLength();
+
+		this.uniforms.spineLength = curveLength;
+		this.curveLengthArray[ index ] = curveLength;
+		this.curveArray[ index ] = curve;
+
+		updateSplineTexture( this.splineTexture, curve, index );
+
+	}
+
+	/**
+	 * Moves the mesh along the curve.
+	 *
+	 * @param {number} amount - The offset.
+	 */
+	moveAlongCurve( amount ) {
+
+		this.uniforms.pathOffset += amount;
+
+	}
+
+}

node_modules/three/examples/jsm/modifiers/EdgeSplitModifier.js

@@ -0,0 +1,299 @@
+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();
+
+/**
+ * The modifier can be used to split faces at sharp edges. This allows to compute
+ * normals without smoothing the edges which can lead to an improved visual result.
+ *
+ * ```js
+ * const modifier = new EdgeSplitModifier();
+ * geometry = modifier.modify( geometry, Math.PI * 0.4 );
+ * ```
+ *
+ * @three_import import { EdgeSplitModifier } from 'three/addons/modifiers/EdgeSplitModifier.js';
+ */
+class EdgeSplitModifier {
+
+	/**
+	 * Returns a new, modified version of the given geometry by applying an edge-split operation.
+	 * Please note that the resulting geometry is always indexed.
+	 *
+	 * @param {BufferGeometry} geometry - The geometry to modify.
+	 * @param {number} cutOffAngle - The cut off angle in radians.
+	 * @param {boolean} [tryKeepNormals=true] - Whether to try to keep normals or not.
+	 * @return {BufferGeometry} A new, modified geometry.
+	 */
+	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 };

node_modules/three/examples/jsm/modifiers/SimplifyModifier.js

@@ -0,0 +1,632 @@
+import {
+	BufferGeometry,
+	Color,
+	Float32BufferAttribute,
+	Vector2,
+	Vector3,
+	Vector4
+} from 'three';
+import * as BufferGeometryUtils from '../utils/BufferGeometryUtils.js';
+
+const _cb = new Vector3(), _ab = new Vector3();
+
+/**
+ * This class can be used to modify a geometry by simplifying it. A typical use
+ * case for such a modifier is automatic LOD generation.
+ *
+ * The implementation is based on [Progressive Mesh type Polygon Reduction Algorithm]{@link https://web.archive.org/web/20230610044040/http://www.melax.com/polychop/}
+ * by Stan Melax in 1998.
+ *
+ * ```js
+ * const modifier = new SimplifyModifier();
+ * geometry = modifier.modify( geometry );
+ * ```
+ *
+ * @three_import import { SimplifyModifier } from 'three/addons/modifiers/SimplifyModifier.js';
+ */
+class SimplifyModifier {
+
+	/**
+	 * Returns a new, modified version of the given geometry by applying a simplification.
+	 * Please note that the resulting geometry is always non-indexed.
+	 *
+	 * @param {BufferGeometry} geometry - The geometry to modify.
+	 * @param {number} count - The number of vertices to remove.
+	 * @return {BufferGeometry} A new, modified geometry.
+	 */
+	modify( geometry, count ) {
+
+		geometry = geometry.clone();
+
+		// currently morphAttributes are not supported
+		delete geometry.morphAttributes.position;
+		delete geometry.morphAttributes.normal;
+		const attributes = geometry.attributes;
+
+		// this modifier can only process indexed and non-indexed geometries with at least a position attribute
+
+		for ( const name in attributes ) {
+
+			if ( name !== 'position' && name !== 'uv' && name !== 'normal' && name !== 'tangent' && name !== 'color' ) geometry.deleteAttribute( name );
+
+		}
+
+		geometry = BufferGeometryUtils.mergeVertices( geometry );
+
+		//
+		// put data of original geometry in different data structures
+		//
+
+		const vertices = [];
+		const faces = [];
+
+		// add vertices
+
+		const positionAttribute = geometry.getAttribute( 'position' );
+		const uvAttribute = geometry.getAttribute( 'uv' );
+		const normalAttribute = geometry.getAttribute( 'normal' );
+		const tangentAttribute = geometry.getAttribute( 'tangent' );
+		const colorAttribute = geometry.getAttribute( 'color' );
+
+		let t = null;
+		let v2 = null;
+		let nor = null;
+		let col = null;
+
+		for ( let i = 0; i < positionAttribute.count; i ++ ) {
+
+			const v = new Vector3().fromBufferAttribute( positionAttribute, i );
+			if ( uvAttribute ) {
+
+				v2 = new Vector2().fromBufferAttribute( uvAttribute, i );
+
+			}
+
+			if ( normalAttribute ) {
+
+				nor = new Vector3().fromBufferAttribute( normalAttribute, i );
+
+			}
+
+			if ( tangentAttribute ) {
+
+				t = new Vector4().fromBufferAttribute( tangentAttribute, i );
+
+			}
+
+			if ( colorAttribute ) {
+
+				col = new Color().fromBufferAttribute( colorAttribute, i );
+
+			}
+
+			const vertex = new Vertex( v, v2, nor, t, col );
+			vertices.push( vertex );
+
+		}
+
+		// add faces
+
+		let index = geometry.getIndex();
+
+		if ( index !== null ) {
+
+			for ( let i = 0; i < index.count; i += 3 ) {
+
+				const a = index.getX( i );
+				const b = index.getX( i + 1 );
+				const c = index.getX( i + 2 );
+
+				const triangle = new Triangle( vertices[ a ], vertices[ b ], vertices[ c ], a, b, c );
+				faces.push( triangle );
+
+			}
+
+		} else {
+
+			for ( let i = 0; i < positionAttribute.count; i += 3 ) {
+
+				const a = i;
+				const b = i + 1;
+				const c = i + 2;
+
+				const triangle = new Triangle( vertices[ a ], vertices[ b ], vertices[ c ], a, b, c );
+				faces.push( triangle );
+
+			}
+
+		}
+
+		// compute all edge collapse costs
+
+		for ( let i = 0, il = vertices.length; i < il; i ++ ) {
+
+			computeEdgeCostAtVertex( vertices[ i ] );
+
+		}
+
+		let nextVertex;
+
+		let z = count;
+
+		while ( z -- ) {
+
+			nextVertex = minimumCostEdge( vertices );
+
+			if ( ! nextVertex ) {
+
+				console.log( 'THREE.SimplifyModifier: No next vertex' );
+				break;
+
+			}
+
+			collapse( vertices, faces, nextVertex, nextVertex.collapseNeighbor );
+
+		}
+
+		//
+
+		const simplifiedGeometry = new BufferGeometry();
+		const position = [];
+		const uv = [];
+		const normal = [];
+		const tangent = [];
+		const color = [];
+
+		index = [];
+
+		//
+
+		for ( let i = 0; i < vertices.length; i ++ ) {
+
+			const vertex = vertices[ i ];
+			position.push( vertex.position.x, vertex.position.y, vertex.position.z );
+			if ( vertex.uv ) {
+
+				uv.push( vertex.uv.x, vertex.uv.y );
+
+			}
+
+			if ( vertex.normal ) {
+
+				normal.push( vertex.normal.x, vertex.normal.y, vertex.normal.z );
+
+			}
+
+			if ( vertex.tangent ) {
+
+				tangent.push( vertex.tangent.x, vertex.tangent.y, vertex.tangent.z, vertex.tangent.w );
+
+			}
+
+			if ( vertex.color ) {
+
+				color.push( vertex.color.r, vertex.color.g, vertex.color.b );
+
+			}
+
+
+			// cache final index to GREATLY speed up faces reconstruction
+			vertex.id = i;
+
+		}
+
+		//
+
+		for ( let i = 0; i < faces.length; i ++ ) {
+
+			const face = faces[ i ];
+			index.push( face.v1.id, face.v2.id, face.v3.id );
+
+		}
+
+		simplifiedGeometry.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );
+		if ( uv.length > 0 ) simplifiedGeometry.setAttribute( 'uv', new Float32BufferAttribute( uv, 2 ) );
+		if ( normal.length > 0 ) simplifiedGeometry.setAttribute( 'normal', new Float32BufferAttribute( normal, 3 ) );
+		if ( tangent.length > 0 ) simplifiedGeometry.setAttribute( 'tangent', new Float32BufferAttribute( tangent, 4 ) );
+		if ( color.length > 0 ) simplifiedGeometry.setAttribute( 'color', new Float32BufferAttribute( color, 3 ) );
+
+		simplifiedGeometry.setIndex( index );
+
+		return simplifiedGeometry;
+
+	}
+
+}
+
+function pushIfUnique( array, object ) {
+
+	if ( array.indexOf( object ) === - 1 ) array.push( object );
+
+}
+
+function removeFromArray( array, object ) {
+
+	const k = array.indexOf( object );
+	if ( k > - 1 ) array.splice( k, 1 );
+
+}
+
+function computeEdgeCollapseCost( u, v ) {
+
+	// if we collapse edge uv by moving u to v then how
+	// much different will the model change, i.e. the "error".
+
+	const edgelength = v.position.distanceTo( u.position );
+	let curvature = 0;
+
+	const sideFaces = [];
+
+	// find the "sides" triangles that are on the edge uv
+	for ( let i = 0, il = u.faces.length; i < il; i ++ ) {
+
+		const face = u.faces[ i ];
+
+		if ( face.hasVertex( v ) ) {
+
+			sideFaces.push( face );
+
+		}
+
+	}
+
+	// use the triangle facing most away from the sides
+	// to determine our curvature term
+	for ( let i = 0, il = u.faces.length; i < il; i ++ ) {
+
+		let minCurvature = 1;
+		const face = u.faces[ i ];
+
+		for ( let j = 0; j < sideFaces.length; j ++ ) {
+
+			const sideFace = sideFaces[ j ];
+			// use dot product of face normals.
+			const dotProd = face.normal.dot( sideFace.normal );
+			minCurvature = Math.min( minCurvature, ( 1.001 - dotProd ) / 2 );
+
+		}
+
+		curvature = Math.max( curvature, minCurvature );
+
+	}
+
+	// crude approach in attempt to preserve borders
+	// though it seems not to be totally correct
+	const borders = 0;
+
+	if ( sideFaces.length < 2 ) {
+
+		// we add some arbitrary cost for borders,
+		// borders += 10;
+		curvature = 1;
+
+	}
+
+	const amt = edgelength * curvature + borders;
+
+	return amt;
+
+}
+
+function computeEdgeCostAtVertex( v ) {
+
+	// compute the edge collapse cost for all edges that start
+	// from vertex v.  Since we are only interested in reducing
+	// the object by selecting the min cost edge at each step, we
+	// only cache the cost of the least cost edge at this vertex
+	// (in member variable collapse) as well as the value of the
+	// cost (in member variable collapseCost).
+
+	if ( v.neighbors.length === 0 ) {
+
+		// collapse if no neighbors.
+		v.collapseNeighbor = null;
+		v.collapseCost = - 0.01;
+
+		return;
+
+	}
+
+	v.collapseCost = 100000;
+	v.collapseNeighbor = null;
+
+	// search all neighboring edges for "least cost" edge
+	for ( let i = 0; i < v.neighbors.length; i ++ ) {
+
+		const collapseCost = computeEdgeCollapseCost( v, v.neighbors[ i ] );
+
+		if ( ! v.collapseNeighbor ) {
+
+			v.collapseNeighbor = v.neighbors[ i ];
+			v.collapseCost = collapseCost;
+			v.minCost = collapseCost;
+			v.totalCost = 0;
+			v.costCount = 0;
+
+		}
+
+		v.costCount ++;
+		v.totalCost += collapseCost;
+
+		if ( collapseCost < v.minCost ) {
+
+			v.collapseNeighbor = v.neighbors[ i ];
+			v.minCost = collapseCost;
+
+		}
+
+	}
+
+	// we average the cost of collapsing at this vertex
+	v.collapseCost = v.totalCost / v.costCount;
+	// v.collapseCost = v.minCost;
+
+}
+
+function removeVertex( v, vertices ) {
+
+	console.assert( v.faces.length === 0 );
+
+	while ( v.neighbors.length ) {
+
+		const n = v.neighbors.pop();
+		removeFromArray( n.neighbors, v );
+
+	}
+
+	removeFromArray( vertices, v );
+
+}
+
+function removeFace( f, faces ) {
+
+	removeFromArray( faces, f );
+
+	if ( f.v1 ) removeFromArray( f.v1.faces, f );
+	if ( f.v2 ) removeFromArray( f.v2.faces, f );
+	if ( f.v3 ) removeFromArray( f.v3.faces, f );
+
+	// TODO optimize this!
+	const vs = [ f.v1, f.v2, f.v3 ];
+
+	for ( let i = 0; i < 3; i ++ ) {
+
+		const v1 = vs[ i ];
+		const v2 = vs[ ( i + 1 ) % 3 ];
+
+		if ( ! v1 || ! v2 ) continue;
+
+		v1.removeIfNonNeighbor( v2 );
+		v2.removeIfNonNeighbor( v1 );
+
+	}
+
+}
+
+function collapse( vertices, faces, u, v ) {
+
+	// Collapse the edge uv by moving vertex u onto v
+
+	if ( ! v ) {
+
+		// u is a vertex all by itself so just delete it..
+		removeVertex( u, vertices );
+		return;
+
+	}
+
+	if ( v.uv ) {
+
+		u.uv.copy( v.uv );
+
+	}
+
+	if ( v.normal ) {
+
+		v.normal.add( u.normal ).normalize();
+
+	}
+
+	if ( v.tangent ) {
+
+		v.tangent.add( u.tangent ).normalize();
+
+	}
+
+	const tmpVertices = [];
+
+	for ( let i = 0; i < u.neighbors.length; i ++ ) {
+
+		tmpVertices.push( u.neighbors[ i ] );
+
+	}
+
+
+	// delete triangles on edge uv:
+	for ( let i = u.faces.length - 1; i >= 0; i -- ) {
+
+		if ( u.faces[ i ] && u.faces[ i ].hasVertex( v ) ) {
+
+			removeFace( u.faces[ i ], faces );
+
+		}
+
+	}
+
+	// update remaining triangles to have v instead of u
+	for ( let i = u.faces.length - 1; i >= 0; i -- ) {
+
+		u.faces[ i ].replaceVertex( u, v );
+
+	}
+
+
+	removeVertex( u, vertices );
+
+	// recompute the edge collapse costs in neighborhood
+	for ( let i = 0; i < tmpVertices.length; i ++ ) {
+
+		computeEdgeCostAtVertex( tmpVertices[ i ] );
+
+	}
+
+}
+
+
+
+function minimumCostEdge( vertices ) {
+
+	// O(n * n) approach. TODO optimize this
+
+	let least = vertices[ 0 ];
+
+	for ( let i = 0; i < vertices.length; i ++ ) {
+
+		if ( vertices[ i ].collapseCost < least.collapseCost ) {
+
+			least = vertices[ i ];
+
+		}
+
+	}
+
+	return least;
+
+}
+
+// we use a triangle class to represent structure of face slightly differently
+
+class Triangle {
+
+	constructor( v1, v2, v3, a, b, c ) {
+
+		this.a = a;
+		this.b = b;
+		this.c = c;
+
+		this.v1 = v1;
+		this.v2 = v2;
+		this.v3 = v3;
+
+		this.normal = new Vector3();
+
+		this.computeNormal();
+
+		v1.faces.push( this );
+		v1.addUniqueNeighbor( v2 );
+		v1.addUniqueNeighbor( v3 );
+
+		v2.faces.push( this );
+		v2.addUniqueNeighbor( v1 );
+		v2.addUniqueNeighbor( v3 );
+
+
+		v3.faces.push( this );
+		v3.addUniqueNeighbor( v1 );
+		v3.addUniqueNeighbor( v2 );
+
+	}
+
+	computeNormal() {
+
+		const vA = this.v1.position;
+		const vB = this.v2.position;
+		const vC = this.v3.position;
+
+		_cb.subVectors( vC, vB );
+		_ab.subVectors( vA, vB );
+		_cb.cross( _ab ).normalize();
+
+		this.normal.copy( _cb );
+
+	}
+
+	hasVertex( v ) {
+
+		return v === this.v1 || v === this.v2 || v === this.v3;
+
+	}
+
+	replaceVertex( oldv, newv ) {
+
+		if ( oldv === this.v1 ) this.v1 = newv;
+		else if ( oldv === this.v2 ) this.v2 = newv;
+		else if ( oldv === this.v3 ) this.v3 = newv;
+
+		removeFromArray( oldv.faces, this );
+		newv.faces.push( this );
+
+
+		oldv.removeIfNonNeighbor( this.v1 );
+		this.v1.removeIfNonNeighbor( oldv );
+
+		oldv.removeIfNonNeighbor( this.v2 );
+		this.v2.removeIfNonNeighbor( oldv );
+
+		oldv.removeIfNonNeighbor( this.v3 );
+		this.v3.removeIfNonNeighbor( oldv );
+
+		this.v1.addUniqueNeighbor( this.v2 );
+		this.v1.addUniqueNeighbor( this.v3 );
+
+		this.v2.addUniqueNeighbor( this.v1 );
+		this.v2.addUniqueNeighbor( this.v3 );
+
+		this.v3.addUniqueNeighbor( this.v1 );
+		this.v3.addUniqueNeighbor( this.v2 );
+
+		this.computeNormal();
+
+	}
+
+}
+
+class Vertex {
+
+	constructor( v, uv, normal, tangent, color ) {
+
+		this.position = v;
+		this.uv = uv;
+		this.normal = normal;
+		this.tangent = tangent;
+		this.color = color;
+
+		this.id = - 1; // external use position in vertices list (for e.g. face generation)
+
+		this.faces = []; // faces vertex is connected
+		this.neighbors = []; // neighbouring vertices aka "adjacentVertices"
+
+		// these will be computed in computeEdgeCostAtVertex()
+		this.collapseCost = 0; // cost of collapsing this vertex, the less the better. aka objdist
+		this.collapseNeighbor = null; // best candidate for collapsing
+
+	}
+
+	addUniqueNeighbor( vertex ) {
+
+		pushIfUnique( this.neighbors, vertex );
+
+	}
+
+	removeIfNonNeighbor( n ) {
+
+		const neighbors = this.neighbors;
+		const faces = this.faces;
+
+		const offset = neighbors.indexOf( n );
+
+		if ( offset === - 1 ) return;
+
+		for ( let i = 0; i < faces.length; i ++ ) {
+
+			if ( faces[ i ].hasVertex( n ) ) return;
+
+		}
+
+		neighbors.splice( offset, 1 );
+
+	}
+
+}
+
+export { SimplifyModifier };

node_modules/three/examples/jsm/modifiers/TessellateModifier.js

@@ -0,0 +1,340 @@
+import {
+	BufferGeometry,
+	Color,
+	Float32BufferAttribute,
+	Vector2,
+	Vector3
+} from 'three';
+
+/**
+ * This class can be used to modify a geometry by breaking its edges if they
+ * are longer than maximum length.
+ *
+ * ```js
+ * const modifier = new TessellateModifier( 8, 6 );
+ * geometry = modifier.modify( geometry );
+ * ```
+ *
+ * @three_import import { TessellateModifier } from 'three/addons/modifiers/TessellateModifier.js';
+ */
+class TessellateModifier {
+
+	/**
+	 * Constructs a new Tessellate modifier.
+	 *
+	 * @param {number} [maxEdgeLength=0.1] - The maximum edge length.
+	 * @param {number} [maxIterations=6] - The number of iterations.
+	 */
+	constructor( maxEdgeLength = 0.1, maxIterations = 6 ) {
+
+		/**
+		 * The maximum edge length.
+		 *
+		 * @type {number}
+		 * @default 0.1
+		 */
+		this.maxEdgeLength = maxEdgeLength;
+
+		/**
+		 * The maximum edge length.
+		 *
+		 * @type {number}
+		 * @default 0.1
+		 */
+		this.maxIterations = maxIterations;
+
+	}
+
+	/**
+	 * Returns a new, modified version of the given geometry by applying a tesselation.
+	 * Please note that the resulting geometry is always non-indexed.
+	 *
+	 * @param {BufferGeometry} geometry - The geometry to modify.
+	 * @return {BufferGeometry} A new, modified geometry.
+	 */
+	modify( geometry ) {
+
+		if ( geometry.index !== null ) {
+
+			geometry = geometry.toNonIndexed();
+
+		}
+
+		//
+
+		const maxIterations = this.maxIterations;
+		const maxEdgeLengthSquared = this.maxEdgeLength * this.maxEdgeLength;
+
+		const va = new Vector3();
+		const vb = new Vector3();
+		const vc = new Vector3();
+		const vm = new Vector3();
+		const vs = [ va, vb, vc, vm ];
+
+		const na = new Vector3();
+		const nb = new Vector3();
+		const nc = new Vector3();
+		const nm = new Vector3();
+		const ns = [ na, nb, nc, nm ];
+
+		const ca = new Color();
+		const cb = new Color();
+		const cc = new Color();
+		const cm = new Color();
+		const cs = [ ca, cb, cc, cm ];
+
+		const ua = new Vector2();
+		const ub = new Vector2();
+		const uc = new Vector2();
+		const um = new Vector2();
+		const us = [ ua, ub, uc, um ];
+
+		const u2a = new Vector2();
+		const u2b = new Vector2();
+		const u2c = new Vector2();
+		const u2m = new Vector2();
+		const u2s = [ u2a, u2b, u2c, u2m ];
+
+		const attributes = geometry.attributes;
+		const hasNormals = attributes.normal !== undefined;
+		const hasColors = attributes.color !== undefined;
+		const hasUVs = attributes.uv !== undefined;
+		const hasUV1s = attributes.uv1 !== undefined;
+
+		let positions = attributes.position.array;
+		let normals = hasNormals ? attributes.normal.array : null;
+		let colors = hasColors ? attributes.color.array : null;
+		let uvs = hasUVs ? attributes.uv.array : null;
+		let uv1s = hasUV1s ? attributes.uv1.array : null;
+
+		let positions2 = positions;
+		let normals2 = normals;
+		let colors2 = colors;
+		let uvs2 = uvs;
+		let uv1s2 = uv1s;
+
+		let iteration = 0;
+		let tessellating = true;
+
+		function addTriangle( a, b, c ) {
+
+			const v1 = vs[ a ];
+			const v2 = vs[ b ];
+			const v3 = vs[ c ];
+
+			positions2.push( v1.x, v1.y, v1.z );
+			positions2.push( v2.x, v2.y, v2.z );
+			positions2.push( v3.x, v3.y, v3.z );
+
+			if ( hasNormals ) {
+
+				const n1 = ns[ a ];
+				const n2 = ns[ b ];
+				const n3 = ns[ c ];
+
+				normals2.push( n1.x, n1.y, n1.z );
+				normals2.push( n2.x, n2.y, n2.z );
+				normals2.push( n3.x, n3.y, n3.z );
+
+			}
+
+			if ( hasColors ) {
+
+				const c1 = cs[ a ];
+				const c2 = cs[ b ];
+				const c3 = cs[ c ];
+
+				colors2.push( c1.r, c1.g, c1.b );
+				colors2.push( c2.r, c2.g, c2.b );
+				colors2.push( c3.r, c3.g, c3.b );
+
+			}
+
+			if ( hasUVs ) {
+
+				const u1 = us[ a ];
+				const u2 = us[ b ];
+				const u3 = us[ c ];
+
+				uvs2.push( u1.x, u1.y );
+				uvs2.push( u2.x, u2.y );
+				uvs2.push( u3.x, u3.y );
+
+			}
+
+			if ( hasUV1s ) {
+
+				const u21 = u2s[ a ];
+				const u22 = u2s[ b ];
+				const u23 = u2s[ c ];
+
+				uv1s2.push( u21.x, u21.y );
+				uv1s2.push( u22.x, u22.y );
+				uv1s2.push( u23.x, u23.y );
+
+			}
+
+		}
+
+		while ( tessellating && iteration < maxIterations ) {
+
+			iteration ++;
+			tessellating = false;
+
+			positions = positions2;
+			positions2 = [];
+
+			if ( hasNormals ) {
+
+				normals = normals2;
+				normals2 = [];
+
+			}
+
+			if ( hasColors ) {
+
+				colors = colors2;
+				colors2 = [];
+
+			}
+
+			if ( hasUVs ) {
+
+				uvs = uvs2;
+				uvs2 = [];
+
+			}
+
+			if ( hasUV1s ) {
+
+				uv1s = uv1s2;
+				uv1s2 = [];
+
+			}
+
+			for ( let i = 0, i2 = 0, il = positions.length; i < il; i += 9, i2 += 6 ) {
+
+				va.fromArray( positions, i + 0 );
+				vb.fromArray( positions, i + 3 );
+				vc.fromArray( positions, i + 6 );
+
+				if ( hasNormals ) {
+
+					na.fromArray( normals, i + 0 );
+					nb.fromArray( normals, i + 3 );
+					nc.fromArray( normals, i + 6 );
+
+				}
+
+				if ( hasColors ) {
+
+					ca.fromArray( colors, i + 0 );
+					cb.fromArray( colors, i + 3 );
+					cc.fromArray( colors, i + 6 );
+
+				}
+
+				if ( hasUVs ) {
+
+					ua.fromArray( uvs, i2 + 0 );
+					ub.fromArray( uvs, i2 + 2 );
+					uc.fromArray( uvs, i2 + 4 );
+
+				}
+
+				if ( hasUV1s ) {
+
+					u2a.fromArray( uv1s, i2 + 0 );
+					u2b.fromArray( uv1s, i2 + 2 );
+					u2c.fromArray( uv1s, i2 + 4 );
+
+				}
+
+				const dab = va.distanceToSquared( vb );
+				const dbc = vb.distanceToSquared( vc );
+				const dac = va.distanceToSquared( vc );
+
+				if ( dab > maxEdgeLengthSquared || dbc > maxEdgeLengthSquared || dac > maxEdgeLengthSquared ) {
+
+					tessellating = true;
+
+					if ( dab >= dbc && dab >= dac ) {
+
+						vm.lerpVectors( va, vb, 0.5 );
+						if ( hasNormals ) nm.lerpVectors( na, nb, 0.5 );
+						if ( hasColors ) cm.lerpColors( ca, cb, 0.5 );
+						if ( hasUVs ) um.lerpVectors( ua, ub, 0.5 );
+						if ( hasUV1s ) u2m.lerpVectors( u2a, u2b, 0.5 );
+
+						addTriangle( 0, 3, 2 );
+						addTriangle( 3, 1, 2 );
+
+					} else if ( dbc >= dab && dbc >= dac ) {
+
+						vm.lerpVectors( vb, vc, 0.5 );
+						if ( hasNormals ) nm.lerpVectors( nb, nc, 0.5 );
+						if ( hasColors ) cm.lerpColors( cb, cc, 0.5 );
+						if ( hasUVs ) um.lerpVectors( ub, uc, 0.5 );
+						if ( hasUV1s ) u2m.lerpVectors( u2b, u2c, 0.5 );
+
+						addTriangle( 0, 1, 3 );
+						addTriangle( 3, 2, 0 );
+
+					} else {
+
+						vm.lerpVectors( va, vc, 0.5 );
+						if ( hasNormals ) nm.lerpVectors( na, nc, 0.5 );
+						if ( hasColors ) cm.lerpColors( ca, cc, 0.5 );
+						if ( hasUVs ) um.lerpVectors( ua, uc, 0.5 );
+						if ( hasUV1s ) u2m.lerpVectors( u2a, u2c, 0.5 );
+
+						addTriangle( 0, 1, 3 );
+						addTriangle( 3, 1, 2 );
+
+					}
+
+				} else {
+
+					addTriangle( 0, 1, 2 );
+
+				}
+
+			}
+
+		}
+
+		const geometry2 = new BufferGeometry();
+
+		geometry2.setAttribute( 'position', new Float32BufferAttribute( positions2, 3 ) );
+
+		if ( hasNormals ) {
+
+			geometry2.setAttribute( 'normal', new Float32BufferAttribute( normals2, 3 ) );
+
+		}
+
+		if ( hasColors ) {
+
+			geometry2.setAttribute( 'color', new Float32BufferAttribute( colors2, 3 ) );
+
+		}
+
+		if ( hasUVs ) {
+
+			geometry2.setAttribute( 'uv', new Float32BufferAttribute( uvs2, 2 ) );
+
+		}
+
+		if ( hasUV1s ) {
+
+			geometry2.setAttribute( 'uv1', new Float32BufferAttribute( uv1s2, 2 ) );
+
+		}
+
+		return geometry2;
+
+	}
+
+}
+
+export { TessellateModifier };