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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - raymarching - reflect</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">
		<style type="text/css">
			html, body {
				height: 100%;
			}
			#container {
				width: 100%;
				height: 100%;
				display: flex;
				align-items: center;
				justify-content: center;
			}
		</style>
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl raymarching example<br/>
			reflect by <a href="https://github.com/gam0022" target="_blank" rel="noopener">gam0022</a> (<a href="http://qiita.com/gam0022/items/03699a07e4a4b5f2d41f" target="_blank" rel="noopener">article</a>)
		</div>
		<div id="container">
			<canvas id="canvas"></canvas>
		</div>

		<script id="fragment_shader" type="x-shader/x-fragment">

			precision highp float;

			uniform vec2 resolution;

			uniform mat4 viewMatrix;
			uniform vec3 cameraPosition;

			uniform mat4 cameraWorldMatrix;
			uniform mat4 cameraProjectionMatrixInverse;

			const float EPS = 0.01;
			const float OFFSET = EPS * 100.0;
			const vec3 lightDir = vec3( -0.48666426339228763, 0.8111071056538127, -0.3244428422615251 );

			// distance functions
			vec3 opRep( vec3 p, float interval ) {

				vec2 q = mod( p.xz, interval ) - interval * 0.5;
				return vec3( q.x, p.y, q.y );

			}

			float sphereDist( vec3 p, float r ) {

				return length( opRep( p, 3.0 ) ) - r;

			}

			float floorDist( vec3 p ){

				return dot(p, vec3( 0.0, 1.0, 0.0 ) ) + 1.0;

			}

			vec4 minVec4( vec4 a, vec4 b ) {

				return ( a.a < b.a ) ? a : b;

			}

			float checkeredPattern( vec3 p ) {

				float u = 1.0 - floor( mod( p.x, 2.0 ) );
				float v = 1.0 - floor( mod( p.z, 2.0 ) );

				if ( ( u == 1.0 && v < 1.0 ) || ( u < 1.0 && v == 1.0 ) ) {

					return 0.2;

				} else {

					return 1.0;

				}

			}

			vec3 hsv2rgb( vec3 c ) {

				vec4 K = vec4( 1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0 );
				vec3 p = abs( fract( c.xxx + K.xyz ) * 6.0 - K.www );
				return c.z * mix( K.xxx, clamp( p - K.xxx, 0.0, 1.0 ), c.y );

			}

			float sceneDist( vec3 p ) {

				return min(
					sphereDist( p, 1.0 ),
					floorDist( p )
				);

			}

			vec4 sceneColor( vec3 p ) {

				return minVec4(
					// 3 * 6 / 2 = 9
					vec4( hsv2rgb(vec3( ( p.z + p.x ) / 9.0, 1.0, 1.0 ) ), sphereDist( p, 1.0 ) ),
					vec4( vec3( 0.5 ) * checkeredPattern( p ), floorDist( p ) )
				);

			}

			vec3 getNormal( vec3 p ) {

				return normalize(vec3(
					sceneDist(p + vec3( EPS, 0.0, 0.0 ) ) - sceneDist(p + vec3( -EPS, 0.0, 0.0 ) ),
					sceneDist(p + vec3( 0.0, EPS, 0.0 ) ) - sceneDist(p + vec3( 0.0, -EPS, 0.0 ) ),
					sceneDist(p + vec3( 0.0, 0.0, EPS ) ) - sceneDist(p + vec3( 0.0, 0.0, -EPS ) )
				));

			}

			float getShadow( vec3 ro, vec3 rd ) {

				float h = 0.0;
				float c = 0.0;
				float r = 1.0;
				float shadowCoef = 0.5;

				for ( float t = 0.0; t < 50.0; t++ ) {

					h = sceneDist( ro + rd * c );

					if ( h < EPS ) return shadowCoef;

					r = min( r, h * 16.0 / c );
					c += h;

				}

				return 1.0 - shadowCoef + r * shadowCoef;

			}

			vec3 getRayColor( vec3 origin, vec3 ray, out vec3 pos, out vec3 normal, out bool hit ) {

				// marching loop
				float dist;
				float depth = 0.0;
				pos = origin;

				for ( int i = 0; i < 64; i++ ){

					dist = sceneDist( pos );
					depth += dist;
					pos = origin + depth * ray;

					if ( abs(dist) < EPS ) break;

				}

				// hit check and calc color
				vec3 color;

				if ( abs(dist) < EPS ) {

					normal = getNormal( pos );
					float diffuse = clamp( dot( lightDir, normal ), 0.1, 1.0 );
					float specular = pow( clamp( dot( reflect( lightDir, normal ), ray ), 0.0, 1.0 ), 10.0 );
					float shadow = getShadow( pos + normal * OFFSET, lightDir );
					color = ( sceneColor( pos ).rgb * diffuse + vec3( 0.8 ) * specular ) * max( 0.5, shadow );

					hit = true;

				} else {

					color = vec3( 0.0 );

				}

				return color - pow( clamp( 0.05 * depth, 0.0, 0.6 ), 2.0 );

			}

			void main(void) {

				// screen position
				vec2 screenPos = ( gl_FragCoord.xy * 2.0 - resolution ) / resolution;

				// ray direction in normalized device coordinate
				vec4 ndcRay = vec4( screenPos.xy, 1.0, 1.0 );

				// convert ray direction from normalized device coordinate to world coordinate
				vec3 ray = ( cameraWorldMatrix * cameraProjectionMatrixInverse * ndcRay ).xyz;
				ray = normalize( ray );

				// camera position
				vec3 cPos = cameraPosition;

				// cast ray
				vec3 color = vec3( 0.0 );
				vec3 pos, normal;
				bool hit;
				float alpha = 1.0;

				for ( int i = 0; i < 3; i++ ) {

					color += alpha * getRayColor( cPos, ray, pos, normal, hit );
					alpha *= 0.3;
					ray = normalize( reflect( ray, normal ) );
					cPos = pos + normal * OFFSET;

					if ( !hit ) break;

				}

				gl_FragColor = vec4( color, 1.0 );

			}

		</script>

		<script id="vertex_shader" type="x-shader/x-vertex">

			attribute vec3 position;

			void main(void) {

				gl_Position = vec4(position, 1.0);

			}

		</script>

		<script type="importmap">
			{
				"imports": {
					"three": "../build/three.module.js",
					"three/addons/": "./jsm/"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import Stats from 'three/addons/libs/stats.module.js';
			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

			let dolly, camera, scene, renderer;
			let geometry, material, mesh;
			let stats, clock;

			const canvas = document.querySelector( '#canvas' );

			const config = {
				saveImage: function () {

					renderer.render( scene, camera );
					window.open( canvas.toDataURL() );

				},
				resolution: '512'
			};

			init();

			function init() {

				renderer = new THREE.WebGLRenderer( { canvas: canvas } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( parseInt( config.resolution ), parseInt( config.resolution ) );
				renderer.setAnimationLoop( animate );

				window.addEventListener( 'resize', onWindowResize );

				// THREE.Scene
				scene = new THREE.Scene();

				dolly = new THREE.Group();
				scene.add( dolly );

				clock = new THREE.Clock();

				camera = new THREE.PerspectiveCamera( 60, canvas.width / canvas.height, 1, 2000 );
				camera.position.z = 4;
				dolly.add( camera );

				geometry = new THREE.PlaneGeometry( 2.0, 2.0 );
				material = new THREE.RawShaderMaterial( {
					uniforms: {
						resolution: { value: new THREE.Vector2( canvas.width, canvas.height ) },
						cameraWorldMatrix: { value: camera.matrixWorld },
						cameraProjectionMatrixInverse: { value: camera.projectionMatrixInverse.clone() }
					},
					vertexShader: document.getElementById( 'vertex_shader' ).textContent,
					fragmentShader: document.getElementById( 'fragment_shader' ).textContent
				} );
				mesh = new THREE.Mesh( geometry, material );
				mesh.frustumCulled = false;
				scene.add( mesh );

				// Controls
				const controls = new OrbitControls( camera, canvas );
				controls.enableZoom = false;

				// GUI
				const gui = new GUI();
				gui.add( config, 'saveImage' ).name( 'Save Image' );
				gui.add( config, 'resolution', [ '256', '512', '800', 'full' ] ).name( 'Resolution' ).onChange( onWindowResize );

				stats = new Stats();
				document.body.appendChild( stats.dom );

			}

			function onWindowResize() {

				if ( config.resolution === 'full' ) {

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

				} else {

					renderer.setSize( parseInt( config.resolution ), parseInt( config.resolution ) );

				}

				camera.aspect = canvas.width / canvas.height;
				camera.updateProjectionMatrix();

				material.uniforms.resolution.value.set( canvas.width, canvas.height );
				material.uniforms.cameraProjectionMatrixInverse.value.copy( camera.projectionMatrixInverse );

			}

			function animate() {

				stats.begin();

				const elapsedTime = clock.getElapsedTime();

				dolly.position.z = - elapsedTime;

				renderer.render( scene, camera );

				stats.end();

			}

		</script>

	</body>
</html>