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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - materials - cubemap mipmaps</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - rendering to cubemap mip levels demo.<br/>
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+ Left: original cubemap<br/>
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+ Right: generated cubemap<br/>
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+ </div>
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+
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+ <!-- Import maps polyfill -->
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+ <!-- Remove this when import maps will be widely supported -->
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+ <script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
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+
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+ <script type="importmap">
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+ {
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+ "imports": {
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+ "three": "../build/three.module.js",
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+ "three/addons/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+
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+ let container;
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+ let camera, scene, renderer;
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+
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+ const CubemapFilterShader = {
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+ uniforms: {
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+ cubeTexture: { value: null },
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+ mipIndex: { value: 0 },
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+ },
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+
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+ vertexShader: /* glsl */ `
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+
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+ varying vec3 vWorldDirection;
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+
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+ #include <common>
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+
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+ void main() {
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+ vWorldDirection = transformDirection(position, modelMatrix);
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+ #include <begin_vertex>
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+ #include <project_vertex>
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+ gl_Position.z = gl_Position.w; // set z to camera.far
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+ }
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+
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+ `,
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+
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+ fragmentShader: /* glsl */ `
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+
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+ uniform samplerCube cubeTexture;
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+ varying vec3 vWorldDirection;
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+
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+ uniform float mipIndex;
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+
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+ #include <common>
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+
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+ void main() {
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+ vec3 cubeCoordinates = normalize(vWorldDirection);
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+
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+ // Colorize mip levels
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+ vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
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+ if (mipIndex == 0.0) color.rgb = vec3(1.0, 1.0, 1.0);
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+ else if (mipIndex == 1.0) color.rgb = vec3(0.0, 0.0, 1.0);
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+ else if (mipIndex == 2.0) color.rgb = vec3(0.0, 1.0, 1.0);
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+ else if (mipIndex == 3.0) color.rgb = vec3(0.0, 1.0, 0.0);
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+ else if (mipIndex == 4.0) color.rgb = vec3(1.0, 1.0, 0.0);
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+
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+ gl_FragColor = textureCube(cubeTexture, cubeCoordinates, 0.0) * color;
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+ }
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+
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+ `,
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+ };
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+
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+
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+ init();
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+ animate();
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+
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+
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+ async function loadCubeTexture( urls ) {
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+
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+ return new Promise( function ( resolve ) {
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+
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+ new THREE.CubeTextureLoader().load( urls, function ( cubeTexture ) {
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+
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+ resolve( cubeTexture );
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+
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+ } );
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+
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+
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+ } );
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+
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+ }
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+
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+ function allocateCubemapRenderTarget( cubeMapSize ) {
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+
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+ const params = {
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+ magFilter: THREE.LinearFilter,
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+ minFilter: THREE.LinearMipMapLinearFilter,
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+ generateMipmaps: false,
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+ type: THREE.HalfFloatType,
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+ format: THREE.RGBAFormat,
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+ colorSpace: THREE.LinearSRGBColorSpace,
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+ depthBuffer: false,
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+ };
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+
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+ const rt = new THREE.WebGLCubeRenderTarget( cubeMapSize, params );
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+
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+ const mipLevels = Math.log( cubeMapSize ) * Math.LOG2E + 1.0;
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+ for ( let i = 0; i < mipLevels; i ++ ) rt.texture.mipmaps.push( {} );
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+
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+ rt.texture.mapping = THREE.CubeReflectionMapping;
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+ return rt;
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+
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+ }
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+
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+ function renderToCubeTexture( cubeMapRenderTarget, sourceCubeTexture ) {
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+
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+ const cameras = [];
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+
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+ for ( let i = 0; i < 6; i ++ ) {
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+
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+ // negative fov is not an error
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+ cameras.push( new THREE.PerspectiveCamera( - 90, 1, 1, 10 ) );
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+
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+ }
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+
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+ cameras[ 0 ].up.set( 0, 1, 0 );
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+ cameras[ 0 ].lookAt( 1, 0, 0 );
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+ cameras[ 1 ].up.set( 0, 1, 0 );
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+ cameras[ 1 ].lookAt( - 1, 0, 0 );
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+ cameras[ 2 ].up.set( 0, 0, - 1 );
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+ cameras[ 2 ].lookAt( 0, 1, 0 );
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+ cameras[ 3 ].up.set( 0, 0, 1 );
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+ cameras[ 3 ].lookAt( 0, - 1, 0 );
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+ cameras[ 4 ].up.set( 0, 1, 0 );
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+ cameras[ 4 ].lookAt( 0, 0, 1 );
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+ cameras[ 5 ].up.set( 0, 1, 0 );
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+ cameras[ 5 ].lookAt( 0, 0, - 1 );
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+
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+ for ( let i = 0; i < 6; i ++ ) cameras[ i ].updateMatrixWorld();
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+
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+ const geometry = new THREE.BoxGeometry( 5, 5, 5 );
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+
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+ const material = new THREE.ShaderMaterial( {
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+ name: 'FilterCubemap',
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+ uniforms: THREE.UniformsUtils.clone( CubemapFilterShader.uniforms ),
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+ vertexShader: CubemapFilterShader.vertexShader,
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+ fragmentShader: CubemapFilterShader.fragmentShader,
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+ side: THREE.BackSide,
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+ blending: THREE.NoBlending,
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+ } );
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+
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+ material.uniforms.cubeTexture.value = sourceCubeTexture;
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+
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+ const mesh = new THREE.Mesh( geometry, material );
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+
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+ const currentRenderTarget = renderer.getRenderTarget();
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+ const currentXrEnabled = renderer.xr.enabled;
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+ renderer.xr.enabled = false;
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+
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+ for ( let faceIndex = 0; faceIndex < 6; faceIndex ++ ) {
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+
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+ let mipIndex = 0;
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+ let mipSize = cubeMapRenderTarget.width;
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+
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+ // Render to each texture mip level
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+ while ( mipSize >= 1 ) {
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+
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+ cubeMapRenderTarget.viewport.set( 0, 0, mipSize, mipSize );
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+ renderer.setRenderTarget( cubeMapRenderTarget, faceIndex, mipIndex );
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+ material.uniforms.mipIndex.value = mipIndex;
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+ material.needsUpdate = true;
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+ renderer.render( mesh, cameras[ faceIndex ] );
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+ mipSize >>= 1;
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+ mipIndex ++;
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+
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+ }
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+
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+ }
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+
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+ renderer.setRenderTarget( currentRenderTarget );
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+ renderer.xr.enabled = currentXrEnabled;
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+
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+ mesh.geometry.dispose();
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+ mesh.material.dispose();
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+
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+ }
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+
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+ function init() {
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+
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+ container = document.createElement( 'div' );
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+ document.body.appendChild( container );
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+
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+ // Create renderer
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ container.appendChild( renderer.domElement );
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+
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+ scene = new THREE.Scene();
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+
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+ camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.z = 500;
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+
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+ // Create controls
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+ const controls = new OrbitControls( camera, renderer.domElement );
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+ controls.minPolarAngle = Math.PI / 4;
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+ controls.maxPolarAngle = Math.PI / 1.5;
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ // Load a cube texture
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+ const r = 'textures/cube/Park3Med/';
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+ const urls = [
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+ r + 'px.jpg', r + 'nx.jpg',
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+ r + 'py.jpg', r + 'ny.jpg',
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+ r + 'pz.jpg', r + 'nz.jpg'
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+ ];
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+
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+ loadCubeTexture( urls ).then( ( cubeTexture ) => {
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+
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+ // Allocate a cube map render target
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+ const cubeMapRenderTarget = allocateCubemapRenderTarget( 512 );
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+
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+ // Render to all the mip levels of cubeMapRenderTarget
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+ renderToCubeTexture( cubeMapRenderTarget, cubeTexture );
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+
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+ // Create geometry
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+ const sphere = new THREE.SphereGeometry( 100, 128, 128 );
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+ let material = new THREE.MeshBasicMaterial( { color: 0xffffff, envMap: cubeTexture } );
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+
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+ let mesh = new THREE.Mesh( sphere, material );
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+ mesh.position.set( - 100, 0, 0 );
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+ scene.add( mesh );
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+
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+ material = material.clone();
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+ material.envMap = cubeMapRenderTarget.texture;
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+
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+ mesh = new THREE.Mesh( sphere, material );
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+ mesh.position.set( 100, 0, 0 );
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+ scene.add( mesh );
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+
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+ } );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Sergey Makovkin
