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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js webgl - materials - cubemap mipmaps</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> - rendering to cubemap mip levels demo.<br/>
- Left: original cubemap<br/>
- Right: generated cubemap<br/>
- </div>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- let container;
- let camera, scene, renderer;
- const CubemapFilterShader = {
- name: 'CubemapFilterShader',
- uniforms: {
- cubeTexture: { value: null },
- mipIndex: { value: 0 },
- },
- vertexShader: /* glsl */ `
- varying vec3 vWorldDirection;
- #include <common>
- void main() {
- vWorldDirection = transformDirection(position, modelMatrix);
- #include <begin_vertex>
- #include <project_vertex>
- gl_Position.z = gl_Position.w; // set z to camera.far
- }
- `,
- fragmentShader: /* glsl */ `
- uniform samplerCube cubeTexture;
- varying vec3 vWorldDirection;
- uniform float mipIndex;
- #include <common>
- void main() {
- vec3 cubeCoordinates = normalize(vWorldDirection);
- // Colorize mip levels
- vec4 color = vec4(1.0, 0.0, 0.0, 1.0);
- if (mipIndex == 0.0) color.rgb = vec3(1.0, 1.0, 1.0);
- else if (mipIndex == 1.0) color.rgb = vec3(0.0, 0.0, 1.0);
- else if (mipIndex == 2.0) color.rgb = vec3(0.0, 1.0, 1.0);
- else if (mipIndex == 3.0) color.rgb = vec3(0.0, 1.0, 0.0);
- else if (mipIndex == 4.0) color.rgb = vec3(1.0, 1.0, 0.0);
- gl_FragColor = textureCube(cubeTexture, cubeCoordinates, 0.0) * color;
- }
- `,
- };
- init();
- async function loadCubeTexture( urls ) {
- return new Promise( function ( resolve ) {
- new THREE.CubeTextureLoader().load( urls, function ( cubeTexture ) {
- resolve( cubeTexture );
- } );
- } );
- }
- function allocateCubemapRenderTarget( cubeMapSize ) {
- const params = {
- magFilter: THREE.LinearFilter,
- minFilter: THREE.LinearMipMapLinearFilter,
- generateMipmaps: false,
- type: THREE.HalfFloatType,
- format: THREE.RGBAFormat,
- colorSpace: THREE.LinearSRGBColorSpace,
- depthBuffer: false,
- };
- const rt = new THREE.WebGLCubeRenderTarget( cubeMapSize, params );
- const mipLevels = Math.log( cubeMapSize ) * Math.LOG2E + 1.0;
- for ( let i = 0; i < mipLevels; i ++ ) rt.texture.mipmaps.push( {} );
- rt.texture.mapping = THREE.CubeReflectionMapping;
- return rt;
- }
- function renderToCubeTexture( cubeMapRenderTarget, sourceCubeTexture ) {
- const geometry = new THREE.BoxGeometry( 5, 5, 5 );
- const material = new THREE.ShaderMaterial( {
- name: CubemapFilterShader.name,
- uniforms: THREE.UniformsUtils.clone( CubemapFilterShader.uniforms ),
- vertexShader: CubemapFilterShader.vertexShader,
- fragmentShader: CubemapFilterShader.fragmentShader,
- side: THREE.BackSide,
- blending: THREE.NoBlending,
- } );
- material.uniforms.cubeTexture.value = sourceCubeTexture;
- const mesh = new THREE.Mesh( geometry, material );
- const cubeCamera = new THREE.CubeCamera( 1, 10, cubeMapRenderTarget );
- const mipmapCount = Math.floor( Math.log2( Math.max( cubeMapRenderTarget.width, cubeMapRenderTarget.height ) ) );
- for ( let mipmap = 0; mipmap < mipmapCount; mipmap ++ ) {
- material.uniforms.mipIndex.value = mipmap;
- material.needsUpdate = true;
- cubeMapRenderTarget.viewport.set( 0, 0, cubeMapRenderTarget.width >> mipmap, cubeMapRenderTarget.height >> mipmap );
- cubeCamera.activeMipmapLevel = mipmap;
- cubeCamera.update( renderer, mesh );
- }
- mesh.geometry.dispose();
- mesh.material.dispose();
- }
- function init() {
- container = document.createElement( 'div' );
- document.body.appendChild( container );
- // Create renderer
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- container.appendChild( renderer.domElement );
- scene = new THREE.Scene();
- camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10000 );
- camera.position.z = 500;
- // Create controls
- const controls = new OrbitControls( camera, renderer.domElement );
- controls.minPolarAngle = Math.PI / 4;
- controls.maxPolarAngle = Math.PI / 1.5;
- window.addEventListener( 'resize', onWindowResize );
- // Load a cube texture
- const r = 'textures/cube/Park3Med/';
- const urls = [
- r + 'px.jpg', r + 'nx.jpg',
- r + 'py.jpg', r + 'ny.jpg',
- r + 'pz.jpg', r + 'nz.jpg'
- ];
- loadCubeTexture( urls ).then( ( cubeTexture ) => {
- // Allocate a cube map render target
- const cubeMapRenderTarget = allocateCubemapRenderTarget( 512 );
- // Render to all the mip levels of cubeMapRenderTarget
- renderToCubeTexture( cubeMapRenderTarget, cubeTexture );
- // Create geometry
- const sphere = new THREE.SphereGeometry( 100, 128, 128 );
- let material = new THREE.MeshBasicMaterial( { color: 0xffffff, envMap: cubeTexture } );
- let mesh = new THREE.Mesh( sphere, material );
- mesh.position.set( - 100, 0, 0 );
- scene.add( mesh );
- material = material.clone();
- material.envMap = cubeMapRenderTarget.texture;
- mesh = new THREE.Mesh( sphere, material );
- mesh.position.set( 100, 0, 0 );
- scene.add( mesh );
- } );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function animate() {
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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