javascript
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three.js
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>js webgl - box projected cubemap environment mapping</title>
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		<div id="container"></div>
		<div id="info">
			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - box projected cubemap environment mapping. <br> created by <a href="https://codercat.tk" target="_blank" rel="noopener">codercat</a>
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import { GUI } from './jsm/libs/dat.gui.module.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { RectAreaLightUniformsLib } from './jsm/lights/RectAreaLightUniformsLib.js';

			// shader injection for box projected cube environment mapping
			var worldposReplace = `
			#define BOX_PROJECTED_ENV_MAP

			#if defined( USE_ENVMAP ) || defined( DISTANCE ) || defined ( USE_SHADOWMAP )

				vec4 worldPosition = modelMatrix * vec4( transformed, 1.0 );

				#ifdef BOX_PROJECTED_ENV_MAP

					vWorldPosition = worldPosition.xyz;

				#endif

			#endif
			`;

			var envmapParsReplace = `
			#define BOX_PROJECTED_ENV_MAP

			#if defined( USE_ENVMAP ) || defined( PHYSICAL )

				uniform float reflectivity;
				uniform float envMapIntensity;

			#endif

			#ifdef USE_ENVMAP

				#ifdef BOX_PROJECTED_ENV_MAP

					uniform vec3 cubeMapSize;
					uniform vec3 cubeMapPos;
					varying vec3 vWorldPosition;

					vec3 parallaxCorrectNormal( vec3 v, vec3 cubeSize, vec3 cubePos ) {

						vec3 nDir = normalize( v );
						vec3 rbmax = ( .5 * cubeSize + cubePos - vWorldPosition ) / nDir;
						vec3 rbmin = ( -.5 * cubeSize + cubePos - vWorldPosition ) / nDir;

						vec3 rbminmax;
						rbminmax.x = ( nDir.x > 0. ) ? rbmax.x : rbmin.x;
						rbminmax.y = ( nDir.y > 0. ) ? rbmax.y : rbmin.y;
						rbminmax.z = ( nDir.z > 0. ) ? rbmax.z : rbmin.z;

						float correction = min( min( rbminmax.x, rbminmax.y ), rbminmax.z );
						vec3 boxIntersection = vWorldPosition + nDir * correction;

						return boxIntersection - cubePos;
					}

				#endif

				#if ! defined( PHYSICAL ) && ( defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) )

					varying vec3 vWorldPosition;

				#endif

				#ifdef ENVMAP_TYPE_CUBE

					uniform samplerCube envMap;

				#else

					uniform sampler2D envMap;

				#endif

				uniform float flipEnvMap;
				uniform int maxMipLevel;

				#if defined( USE_BUMPMAP ) || defined( USE_NORMALMAP ) || defined( PHONG ) || defined( PHYSICAL )

					uniform float refractionRatio;

				#else

					varying vec3 vReflect;

				#endif

			#endif
			`;

			var envmapPhysicalParsReplace = `
			#if defined( USE_ENVMAP ) && defined( PHYSICAL )

				vec3 getLightProbeIndirectIrradiance( const in GeometricContext geometry, const in int maxMIPLevel ) {
					vec3 worldNormal = inverseTransformDirection( geometry.normal, viewMatrix );
					#ifdef ENVMAP_TYPE_CUBE

						vec3 worldNormalFinal = worldNormal;

					#ifdef BOX_PROJECTED_ENV_MAP

						worldNormalFinal = parallaxCorrectNormal( worldNormal, cubeMapSize, cubeMapPos );

					#endif

					vec3 queryVec = vec3( flipEnvMap * worldNormalFinal.x, worldNormalFinal.yz );

					#ifdef TEXTURE_LOD_EXT

						vec4 envMapColor = textureCubeLodEXT( envMap, queryVec, float( maxMIPLevel ) );

					#else

						vec4 envMapColor = textureCube( envMap, queryVec, float( maxMIPLevel ) );

					#endif

						envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;

					#elif defined( ENVMAP_TYPE_CUBE_UV )

						vec3 queryVec = vec3( flipEnvMap * worldNormal.x, worldNormal.yz );
						vec4 envMapColor = textureCubeUV( envMap, queryVec, 1.0 );

					#else

						vec4 envMapColor = vec4( 0.0 );

					#endif

					return PI * envMapColor.rgb * envMapIntensity;
				}

				float getSpecularMIPLevel( const in float blinnShininessExponent, const in int maxMIPLevel ) {
					float maxMIPLevelScalar = float( maxMIPLevel );
					float desiredMIPLevel = maxMIPLevelScalar + 0.79248 - 0.5 * log2( pow2( blinnShininessExponent ) + 1.0 );
					return clamp( desiredMIPLevel, 0.0, maxMIPLevelScalar );
				}

				vec3 getLightProbeIndirectRadiance( const in vec3 viewDir, const in vec3 normal, const in float blinnShininessExponent, const in int maxMIPLevel ) {

					#ifdef ENVMAP_MODE_REFLECTION

						vec3 reflectVec = reflect( -viewDir, normal );

					#else

						vec3 reflectVec = refract( -viewDir, normal, refractionRatio );

					#endif

					reflectVec = inverseTransformDirection( reflectVec, viewMatrix );
					float specularMIPLevel = getSpecularMIPLevel( blinnShininessExponent, maxMIPLevel );

					#ifdef ENVMAP_TYPE_CUBE

						vec3 reflectVecFinal = reflectVec;

					#ifdef BOX_PROJECTED_ENV_MAP

					 reflectVecFinal = parallaxCorrectNormal( reflectVec, cubeMapSize, cubeMapPos );

					#endif

					vec3 queryReflectVec = vec3( flipEnvMap * reflectVecFinal.x, reflectVecFinal.yz );

					#ifdef TEXTURE_LOD_EXT

						vec4 envMapColor = textureCubeLodEXT( envMap, queryReflectVec, specularMIPLevel );

					#else

						vec4 envMapColor = textureCube( envMap, queryReflectVec, specularMIPLevel );

					#endif

					envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;

					#elif defined( ENVMAP_TYPE_CUBE_UV )

						vec3 queryReflectVec = vec3( flipEnvMap * reflectVec.x, reflectVec.yz );
						vec4 envMapColor = textureCubeUV( envMap, queryReflectVec, BlinnExponentToGGXRoughness(blinnShininessExponent ));

					#elif defined( ENVMAP_TYPE_EQUIREC )

						vec2 sampleUV;
						sampleUV.y = asin( clamp( reflectVec.y, - 1.0, 1.0 ) ) * RECIPROCAL_PI + 0.5;
						sampleUV.x = atan( reflectVec.z, reflectVec.x ) * RECIPROCAL_PI2 + 0.5;

						#ifdef TEXTURE_LOD_EXT

							vec4 envMapColor = texture2DLodEXT( envMap, sampleUV, specularMIPLevel );

						#else

							vec4 envMapColor = texture2D( envMap, sampleUV, specularMIPLevel );

						#endif

						envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;
					#elif defined( ENVMAP_TYPE_SPHERE )

						vec3 reflectView = normalize( ( viewMatrix * vec4( reflectVec, 0.0 ) ).xyz + vec3( 0.0,0.0,1.0 ) );

						#ifdef TEXTURE_LOD_EXT

							vec4 envMapColor = texture2DLodEXT( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );

						#else

							vec4 envMapColor = texture2D( envMap, reflectView.xy * 0.5 + 0.5, specularMIPLevel );

						#endif

						envMapColor.rgb = envMapTexelToLinear( envMapColor ).rgb;

					#endif

					return envMapColor.rgb * envMapIntensity;
				}
			#endif
			`;

			// scene size
			var WIDTH = window.innerWidth;
			var HEIGHT = window.innerHeight;

			// camera
			var VIEW_ANGLE = 45;
			var ASPECT = WIDTH / HEIGHT;
			var NEAR = 1;
			var FAR = 800;

			var camera, cubeCamera, scene, renderer;

			var cameraControls;

			var groundPlane, wallMat;

			init();

			function init() {

				var container = document.getElementById( 'container' );

				// renderer
				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( WIDTH, HEIGHT );
				container.appendChild( renderer.domElement );

				// gui controls
				var gui = new GUI();
				var params = {
					'box projected': true
				};
				var bpcemGui = gui.add( params, 'box projected' );

				bpcemGui.onChange( function ( value ) {

					if ( value ) {

						groundPlane.material = boxProjectedMat;

					} else {

						groundPlane.material = defaultMat;

					}

					render();

				} );

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

				// camera
				camera = new THREE.PerspectiveCamera( VIEW_ANGLE, ASPECT, NEAR, FAR );
				camera.position.set( 280, 106, - 5 );

				cameraControls = new OrbitControls( camera, renderer.domElement );
				cameraControls.target.set( 0, - 10, 0 );
				cameraControls.maxDistance = 400;
				cameraControls.minDistance = 10;
				cameraControls.addEventListener( 'change', render );
				cameraControls.update();

				// cube camera for environment map
				cubeCamera = new THREE.CubeCamera( 1, 1000, 512 );
				cubeCamera.renderTarget.texture.generateMipmaps = true;
				cubeCamera.renderTarget.texture.minFilter = THREE.LinearMipmapLinearFilter;
				cubeCamera.renderTarget.texture.mapping = THREE.CubeReflectionMapping;

				cubeCamera.position.set( 0, - 100, 0 );
				scene.add( cubeCamera );

				// ground floor ( with box projected environment mapping )
				var loader = new THREE.TextureLoader();
				var rMap = loader.load( 'textures/lava/lavatile.jpg' );
				rMap.wrapS = THREE.RepeatWrapping;
				rMap.wrapT = THREE.RepeatWrapping;
				rMap.repeat.set( 2, 1 );

				var defaultMat = new THREE.MeshPhysicalMaterial( {
					roughness: 1,
					envMap: cubeCamera.renderTarget.texture,
					roughnessMap: rMap
				} );

				var boxProjectedMat = new THREE.MeshPhysicalMaterial( {
					color: new THREE.Color( '#ffffff' ),
					roughness: 1,
					envMap: cubeCamera.renderTarget.texture,
					roughnessMap: rMap
				} );

				boxProjectedMat.onBeforeCompile = function ( shader ) {

					//these parameters are for the cubeCamera texture
					shader.uniforms.cubeMapSize = { value: new THREE.Vector3( 200, 200, 100 ) };
					shader.uniforms.cubeMapPos = { value: new THREE.Vector3( 0, - 50, 0 ) };
					shader.uniforms.flipEnvMap.value = true;

					//replace shader chunks with box projection chunks
					shader.vertexShader = 'varying vec3 vWorldPosition;\n' + shader.vertexShader;

					shader.vertexShader = shader.vertexShader.replace(
						'#include <worldpos_vertex>',
						worldposReplace
					);

					shader.fragmentShader = shader.fragmentShader.replace(
						'#include <envmap_pars_fragment>',
						envmapParsReplace
					);

					shader.fragmentShader = shader.fragmentShader.replace(
						'#include <envmap_physical_pars_fragment>',
						envmapPhysicalParsReplace
					);

				};

				groundPlane = new THREE.Mesh( new THREE.PlaneBufferGeometry( 200, 100, 100 ), boxProjectedMat );
				groundPlane.rotateX( - Math.PI / 2 );
				groundPlane.position.set( 0, - 49, 0 );
				scene.add( groundPlane );

				// walls
				var diffuseTex = loader.load( 'textures/brick_diffuse.jpg', function () {

					updateCubeMap();

				} );
				var bumpTex = loader.load( 'textures/brick_bump.jpg', function () {

					updateCubeMap();

				} );

				wallMat = new THREE.MeshPhysicalMaterial( {
					map: diffuseTex,
					bumpMap: bumpTex,
					bumpScale: 0.3,
				} );

				var planeGeo = new THREE.PlaneBufferGeometry( 100, 100 );

				var planeBack1 = new THREE.Mesh( planeGeo, wallMat );
				planeBack1.position.z = - 50;
				planeBack1.position.x = - 50;
				scene.add( planeBack1 );

				var planeBack2 = new THREE.Mesh( planeGeo, wallMat );
				planeBack2.position.z = - 50;
				planeBack2.position.x = 50;
				scene.add( planeBack2 );

				var planeFront1 = new THREE.Mesh( planeGeo, wallMat );
				planeFront1.position.z = 50;
				planeFront1.position.x = - 50;
				planeFront1.rotateY( Math.PI );
				scene.add( planeFront1 );

				var planeFront2 = new THREE.Mesh( planeGeo, wallMat );
				planeFront2.position.z = 50;
				planeFront2.position.x = 50;
				planeFront2.rotateY( Math.PI );
				scene.add( planeFront2 );

				var planeRight = new THREE.Mesh( planeGeo, wallMat );
				planeRight.position.x = 100;
				planeRight.rotateY( - Math.PI / 2 );
				scene.add( planeRight );

				var planeLeft = new THREE.Mesh( planeGeo, wallMat );
				planeLeft.position.x = - 100;
				planeLeft.rotateY( Math.PI / 2 );
				scene.add( planeLeft );

				//lights
				var width = 50;
				var height = 50;
				var intensity = 10;

				RectAreaLightUniformsLib.init();

				var blueRectLight = new THREE.RectAreaLight( 0xf3aaaa, intensity, width, height );
				blueRectLight.position.set( 99, 5, 0 );
				blueRectLight.lookAt( 0, 5, 0 );
				scene.add( blueRectLight );

				var blueRectLightHelper = new THREE.RectAreaLightHelper( blueRectLight, 0xffffff );
				blueRectLight.add( blueRectLightHelper );

				var redRectLight = new THREE.RectAreaLight( 0x9aaeff, intensity, width, height );
				redRectLight.position.set( - 99, 5, 0 );
				redRectLight.lookAt( 0, 5, 0 );
				scene.add( redRectLight );

				var redRectLightHelper = new THREE.RectAreaLightHelper( redRectLight, 0xffffff );
				redRectLight.add( redRectLightHelper );

				render();

			}

			function updateCubeMap() {

				//disable specular highlights on walls in the environment map
				wallMat.roughness = 1;

				groundPlane.visible = false;

				cubeCamera.position.copy( groundPlane.position );

				cubeCamera.update( renderer, scene );

				wallMat.roughness = 0.6;

				groundPlane.visible = true;

				render();

			}

			function render() {

				renderer.render( scene, camera );

			}

		</script>
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