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<title>three.js webgl - materials - shaders [lava]</title>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - shader material demo. featuring lava shader by <a href="http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=21057" target="_blank" rel="noopener">TheGameMaker</a></div>
<script id="fragmentShader" type="x-shader/x-fragment">
uniform float time;
uniform float fogDensity;
uniform vec3 fogColor;
uniform sampler2D texture1;
uniform sampler2D texture2;
varying vec2 vUv;
void main( void ) {
vec2 position = - 1.0 + 2.0 * vUv;
vec4 noise = texture2D( texture1, vUv );
vec2 T1 = vUv + vec2( 1.5, - 1.5 ) * time * 0.02;
vec2 T2 = vUv + vec2( - 0.5, 2.0 ) * time * 0.01;
T1.x += noise.x * 2.0;
T1.y += noise.y * 2.0;
T2.x -= noise.y * 0.2;
T2.y += noise.z * 0.2;
float p = texture2D( texture1, T1 * 2.0 ).a;
vec4 color = texture2D( texture2, T2 * 2.0 );
vec4 temp = color * ( vec4( p, p, p, p ) * 2.0 ) + ( color * color - 0.1 );
if( temp.r > 1.0 ) { temp.bg += clamp( temp.r - 2.0, 0.0, 100.0 ); }
if( temp.g > 1.0 ) { temp.rb += temp.g - 1.0; }
if( temp.b > 1.0 ) { temp.rg += temp.b - 1.0; }
gl_FragColor = temp;
float depth = gl_FragCoord.z / gl_FragCoord.w;
const float LOG2 = 1.442695;
float fogFactor = exp2( - fogDensity * fogDensity * depth * depth * LOG2 );
fogFactor = 1.0 - clamp( fogFactor, 0.0, 1.0 );
gl_FragColor = mix( gl_FragColor, vec4( fogColor, gl_FragColor.w ), fogFactor );
}
</script>
<script id="vertexShader" type="x-shader/x-vertex">
uniform vec2 uvScale;
varying vec2 vUv;
void main()
{
vUv = uvScale * uv;
vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
gl_Position = projectionMatrix * mvPosition;
}
</script>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
import { BloomPass } from 'three/addons/postprocessing/BloomPass.js';
import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';
let camera, renderer, composer, clock;
let uniforms, mesh;
init();
animate();
function init() {
const container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 35, window.innerWidth / window.innerHeight, 1, 3000 );
camera.position.z = 4;
const scene = new THREE.Scene();
clock = new THREE.Clock();
const textureLoader = new THREE.TextureLoader();
const cloudTexture = textureLoader.load( 'textures/lava/cloud.png' );
const lavaTexture = textureLoader.load( 'textures/lava/lavatile.jpg' );
lavaTexture.colorSpace = THREE.SRGBColorSpace;
cloudTexture.wrapS = cloudTexture.wrapT = THREE.RepeatWrapping;
lavaTexture.wrapS = lavaTexture.wrapT = THREE.RepeatWrapping;
uniforms = {
'fogDensity': { value: 0.45 },
'fogColor': { value: new THREE.Vector3( 0, 0, 0 ) },
'time': { value: 1.0 },
'uvScale': { value: new THREE.Vector2( 3.0, 1.0 ) },
'texture1': { value: cloudTexture },
'texture2': { value: lavaTexture }
};
const size = 0.65;
const material = new THREE.ShaderMaterial( {
uniforms: uniforms,
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent
} );
mesh = new THREE.Mesh( new THREE.TorusGeometry( size, 0.3, 30, 30 ), material );
mesh.rotation.x = 0.3;
scene.add( mesh );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.autoClear = false;
container.appendChild( renderer.domElement );
//
const renderModel = new RenderPass( scene, camera );
const effectBloom = new BloomPass( 1.25 );
const outputPass = new OutputPass();
composer = new EffectComposer( renderer );
composer.addPass( renderModel );
composer.addPass( effectBloom );
composer.addPass( outputPass );
//
onWindowResize();
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
composer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
const delta = 5 * clock.getDelta();
uniforms[ 'time' ].value += 0.2 * delta;
mesh.rotation.y += 0.0125 * delta;
mesh.rotation.x += 0.05 * delta;
renderer.clear();
composer.render( 0.01 );
}
</script>
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