javascript
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							<!DOCTYPE html>
<html lang="en">
<head>
	<title>three.js webgl - marching cubes</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
	<link type="text/css" rel="stylesheet" href="main.css">
</head>

<body>

	<div id="container"></div>
	<div id="info">
		<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> -
		marching cubes<br/>
		based on greggman's <a href="https://webglsamples.org/blob/blob.html">blob</a>, original code by Henrik Rydgård
	</div>

	<script type="module">
		import * as THREE from '../build/three.module.js';

		import Stats from './jsm/libs/stats.module.js';

		import { GUI } from './jsm/libs/dat.gui.module.js';
		import { OrbitControls } from './jsm/controls/OrbitControls.js';
		import { MarchingCubes } from './jsm/objects/MarchingCubes.js';
		import { ToonShader1, ToonShader2, ToonShaderHatching, ToonShaderDotted } from './jsm/shaders/ToonShader.js';

		let container, stats;

		let camera, scene, renderer;

		let materials, current_material;

		let light, pointLight, ambientLight;

		let effect, resolution;

		let effectController;

		let time = 0;
		const clock = new THREE.Clock();

		init();
		animate();

		function init() {

			container = document.getElementById( 'container' );

			// CAMERA

			camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
			camera.position.set( - 500, 500, 1500 );

			// SCENE

			scene = new THREE.Scene();
			scene.background = new THREE.Color( 0x050505 );

			// LIGHTS

			light = new THREE.DirectionalLight( 0xffffff );
			light.position.set( 0.5, 0.5, 1 );
			scene.add( light );

			pointLight = new THREE.PointLight( 0xff3300 );
			pointLight.position.set( 0, 0, 100 );
			scene.add( pointLight );

			ambientLight = new THREE.AmbientLight( 0x080808 );
			scene.add( ambientLight );

			// MATERIALS

			materials = generateMaterials();
			current_material = "shiny";

			// MARCHING CUBES

			resolution = 28;

			effect = new MarchingCubes( resolution, materials[ current_material ].m, true, true );
			effect.position.set( 0, 0, 0 );
			effect.scale.set( 700, 700, 700 );

			effect.enableUvs = false;
			effect.enableColors = false;

			scene.add( effect );

			// RENDERER

			renderer = new THREE.WebGLRenderer();
			renderer.outputEncoding = THREE.sRGBEncoding;
			renderer.setPixelRatio( window.devicePixelRatio );
			renderer.setSize( window.innerWidth, window.innerHeight );
			container.appendChild( renderer.domElement );

			// CONTROLS

			const controls = new OrbitControls( camera, renderer.domElement );
			controls.minDistance = 500;
			controls.maxDistance = 5000;

			// STATS

			stats = new Stats();
			container.appendChild( stats.dom );

			// GUI

			setupGui();

			// EVENTS

			window.addEventListener( 'resize', onWindowResize );

		}

		//

		function onWindowResize() {

			camera.aspect = window.innerWidth / window.innerHeight;
			camera.updateProjectionMatrix();

			renderer.setSize( window.innerWidth, window.innerHeight );

		}

		function generateMaterials() {

			// environment map

			const path = "textures/cube/SwedishRoyalCastle/";
			const format = '.jpg';
			const urls = [
				path + 'px' + format, path + 'nx' + format,
				path + 'py' + format, path + 'ny' + format,
				path + 'pz' + format, path + 'nz' + format
			];

			const cubeTextureLoader = new THREE.CubeTextureLoader();

			const reflectionCube = cubeTextureLoader.load( urls );
			const refractionCube = cubeTextureLoader.load( urls );
			refractionCube.mapping = THREE.CubeRefractionMapping;

			// toons

			const toonMaterial1 = createShaderMaterial( ToonShader1, light, ambientLight );
			const toonMaterial2 = createShaderMaterial( ToonShader2, light, ambientLight );
			const hatchingMaterial = createShaderMaterial( ToonShaderHatching, light, ambientLight );
			const dottedMaterial = createShaderMaterial( ToonShaderDotted, light, ambientLight );

			const texture = new THREE.TextureLoader().load( "textures/uv_grid_opengl.jpg" );
			texture.wrapS = THREE.RepeatWrapping;
			texture.wrapT = THREE.RepeatWrapping;

			const materials = {

				"chrome": {
					m: new THREE.MeshLambertMaterial( { color: 0xffffff, envMap: reflectionCube } ),
					h: 0, s: 0, l: 1
				},

				"liquid": {
					m: new THREE.MeshLambertMaterial( { color: 0xffffff, envMap: refractionCube, refractionRatio: 0.85 } ),
					h: 0, s: 0, l: 1
				},

				"shiny": {
					m: new THREE.MeshStandardMaterial( { color: 0x550000, envMap: reflectionCube, roughness: 0.1, metalness: 1.0 } ),
					h: 0, s: 0.8, l: 0.2
				},

				"matte": {
					m: new THREE.MeshPhongMaterial( { color: 0x000000, specular: 0x111111, shininess: 1 } ),
					h: 0, s: 0, l: 1
				},

				"flat": {
					m: new THREE.MeshLambertMaterial( { color: 0x000000, flatShading: true } ),
					h: 0, s: 0, l: 1
				},

				"textured": {
					m: new THREE.MeshPhongMaterial( { color: 0xffffff, specular: 0x111111, shininess: 1, map: texture } ),
					h: 0, s: 0, l: 1
				},

				"colors": {
					m: new THREE.MeshPhongMaterial( { color: 0xffffff, specular: 0xffffff, shininess: 2, vertexColors: true } ),
					h: 0, s: 0, l: 1
				},

				"multiColors": {
					m: new THREE.MeshPhongMaterial( { shininess: 2, vertexColors: true } ),
					h: 0, s: 0, l: 1
				},

				"plastic": {
					m: new THREE.MeshPhongMaterial( { color: 0x000000, specular: 0x888888, shininess: 250 } ),
					h: 0.6, s: 0.8, l: 0.1
				},

				"toon1": {
					m: toonMaterial1,
					h: 0.2, s: 1, l: 0.75
				},

				"toon2": {
					m: toonMaterial2,
					h: 0.4, s: 1, l: 0.75
				},

				"hatching": {
					m: hatchingMaterial,
					h: 0.2, s: 1, l: 0.9
				},

				"dotted": {
					m: dottedMaterial,
					h: 0.2, s: 1, l: 0.9
				}

			};

			return materials;

		}

		function createShaderMaterial( shader, light, ambientLight ) {

			const u = THREE.UniformsUtils.clone( shader.uniforms );

			const vs = shader.vertexShader;
			const fs = shader.fragmentShader;

			const material = new THREE.ShaderMaterial( { uniforms: u, vertexShader: vs, fragmentShader: fs } );

			material.uniforms[ "uDirLightPos" ].value = light.position;
			material.uniforms[ "uDirLightColor" ].value = light.color;

			material.uniforms[ "uAmbientLightColor" ].value = ambientLight.color;

			return material;

		}

		//

		function setupGui() {

			const createHandler = function ( id ) {

				return function () {

					const mat_old = materials[ current_material ];
					mat_old.h = m_h.getValue();
					mat_old.s = m_s.getValue();
					mat_old.l = m_l.getValue();

					current_material = id;

					const mat = materials[ id ];
					effect.material = mat.m;

					m_h.setValue( mat.h );
					m_s.setValue( mat.s );
					m_l.setValue( mat.l );

					effect.enableUvs = ( current_material === "textured" ) ? true : false;
					effect.enableColors = ( current_material === "colors" || current_material === "multiColors" ) ? true : false;

				};

			};

			effectController = {

				material: "shiny",

				speed: 1.0,
				numBlobs: 10,
				resolution: 28,
				isolation: 80,

				floor: true,
				wallx: false,
				wallz: false,

				hue: 0.0,
				saturation: 0.8,
				lightness: 0.1,

				lhue: 0.04,
				lsaturation: 1.0,
				llightness: 0.5,

				lx: 0.5,
				ly: 0.5,
				lz: 1.0,

				dummy: function () {}

			};

			let h;

			const gui = new GUI();

			// material (type)

			h = gui.addFolder( "Materials" );

			for ( const m in materials ) {

				effectController[ m ] = createHandler( m );
				h.add( effectController, m ).name( m );

			}

			// material (color)

			h = gui.addFolder( "Material color" );

			const m_h = h.add( effectController, "hue", 0.0, 1.0, 0.025 );
			const m_s = h.add( effectController, "saturation", 0.0, 1.0, 0.025 );
			const m_l = h.add( effectController, "lightness", 0.0, 1.0, 0.025 );

			// light (point)

			h = gui.addFolder( "Point light color" );

			h.add( effectController, "lhue", 0.0, 1.0, 0.025 ).name( "hue" );
			h.add( effectController, "lsaturation", 0.0, 1.0, 0.025 ).name( "saturation" );
			h.add( effectController, "llightness", 0.0, 1.0, 0.025 ).name( "lightness" );

			// light (directional)

			h = gui.addFolder( "Directional light orientation" );

			h.add( effectController, "lx", - 1.0, 1.0, 0.025 ).name( "x" );
			h.add( effectController, "ly", - 1.0, 1.0, 0.025 ).name( "y" );
			h.add( effectController, "lz", - 1.0, 1.0, 0.025 ).name( "z" );

			// simulation

			h = gui.addFolder( "Simulation" );

			h.add( effectController, "speed", 0.1, 8.0, 0.05 );
			h.add( effectController, "numBlobs", 1, 50, 1 );
			h.add( effectController, "resolution", 14, 100, 1 );
			h.add( effectController, "isolation", 10, 300, 1 );

			h.add( effectController, "floor" );
			h.add( effectController, "wallx" );
			h.add( effectController, "wallz" );

		}

		// this controls content of marching cubes voxel field

		function updateCubes( object, time, numblobs, floor, wallx, wallz ) {

			object.reset();

			// fill the field with some metaballs

			const rainbow = [
				new THREE.Color( 0xff0000 ),
				new THREE.Color( 0xff7f00 ),
				new THREE.Color( 0xffff00 ),
				new THREE.Color( 0x00ff00 ),
				new THREE.Color( 0x0000ff ),
				new THREE.Color( 0x4b0082 ),
				new THREE.Color( 0x9400d3 )
			];
			const subtract = 12;
			const strength = 1.2 / ( ( Math.sqrt( numblobs ) - 1 ) / 4 + 1 );

			for ( let i = 0; i < numblobs; i ++ ) {

				const ballx = Math.sin( i + 1.26 * time * ( 1.03 + 0.5 * Math.cos( 0.21 * i ) ) ) * 0.27 + 0.5;
				const bally = Math.abs( Math.cos( i + 1.12 * time * Math.cos( 1.22 + 0.1424 * i ) ) ) * 0.77; // dip into the floor
				const ballz = Math.cos( i + 1.32 * time * 0.1 * Math.sin( ( 0.92 + 0.53 * i ) ) ) * 0.27 + 0.5;

				if ( current_material === 'multiColors' ) {

					object.addBall( ballx, bally, ballz, strength, subtract, rainbow[ i % 7 ] );

				} else {

					object.addBall( ballx, bally, ballz, strength, subtract );

				}

			}

			if ( floor ) object.addPlaneY( 2, 12 );
			if ( wallz ) object.addPlaneZ( 2, 12 );
			if ( wallx ) object.addPlaneX( 2, 12 );

		}

		//

		function animate() {

			requestAnimationFrame( animate );

			render();
			stats.update();

		}

		function render() {

			const delta = clock.getDelta();

			time += delta * effectController.speed * 0.5;

			// marching cubes

			if ( effectController.resolution !== resolution ) {

				resolution = effectController.resolution;
				effect.init( Math.floor( resolution ) );

			}

			if ( effectController.isolation !== effect.isolation ) {

				effect.isolation = effectController.isolation;

			}

			updateCubes( effect, time, effectController.numBlobs, effectController.floor, effectController.wallx, effectController.wallz );

			// materials

			if ( effect.material instanceof THREE.ShaderMaterial ) {

				effect.material.uniforms[ "uBaseColor" ].value.setHSL( effectController.hue, effectController.saturation, effectController.lightness );

			} else {

				effect.material.color.setHSL( effectController.hue, effectController.saturation, effectController.lightness );

			}

			// lights

			light.position.set( effectController.lx, effectController.ly, effectController.lz );
			light.position.normalize();

			pointLight.color.setHSL( effectController.lhue, effectController.lsaturation, effectController.llightness );

			// render

			renderer.render( scene, camera );

		}

</script>

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