|
|
@@ -0,0 +1,358 @@
|
|
|
+<!DOCTYPE html>
|
|
|
+<html lang="en">
|
|
|
+ <head>
|
|
|
+ <title>three.js webgl2 - volume - cloud</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="info">
|
|
|
+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl2 - volume - cloud
|
|
|
+ </div>
|
|
|
+
|
|
|
+ <script type="module">
|
|
|
+ import * as THREE from '../build/three.module.js';
|
|
|
+ import { OrbitControls } from './jsm/controls/OrbitControls.js';
|
|
|
+ import { ImprovedNoise } from './jsm/math/ImprovedNoise.js';
|
|
|
+
|
|
|
+ import { GUI } from './jsm/libs/dat.gui.module.js';
|
|
|
+ import { WEBGL } from './jsm/WebGL.js';
|
|
|
+
|
|
|
+ if ( WEBGL.isWebGL2Available() === false ) {
|
|
|
+
|
|
|
+ document.body.appendChild( WEBGL.getWebGL2ErrorMessage() );
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ const INITIAL_CLOUD_SIZE = 128;
|
|
|
+
|
|
|
+ let renderer, scene, camera;
|
|
|
+ let mesh;
|
|
|
+ let prevTime = performance.now();
|
|
|
+ let cloudTexture = null;
|
|
|
+
|
|
|
+ init();
|
|
|
+ animate();
|
|
|
+
|
|
|
+ function generateCloudTexture( size, scaleFactor = 1.0 ) {
|
|
|
+
|
|
|
+ const data = new Uint8Array( size * size * size );
|
|
|
+ const scale = scaleFactor * 10.0 / size;
|
|
|
+
|
|
|
+ let i = 0;
|
|
|
+ const perlin = new ImprovedNoise();
|
|
|
+ const vector = new THREE.Vector3();
|
|
|
+
|
|
|
+ for ( let z = 0; z < size; z ++ ) {
|
|
|
+
|
|
|
+ for ( let y = 0; y < size; y ++ ) {
|
|
|
+
|
|
|
+ for ( let x = 0; x < size; x ++ ) {
|
|
|
+
|
|
|
+ const dist = vector.set( x, y, z ).subScalar( size / 2 ).divideScalar( size ).length();
|
|
|
+ const fadingFactor = ( 1.0 - dist ) * ( 1.0 - dist );
|
|
|
+ data[ i ] = ( 128 + 128 * perlin.noise( x * scale / 1.5, y * scale, z * scale / 1.5 ) ) * fadingFactor;
|
|
|
+
|
|
|
+ i ++;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ return new THREE.DataTexture3D( data, size, size, size );
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ function init() {
|
|
|
+
|
|
|
+ renderer = new THREE.WebGLRenderer();
|
|
|
+ renderer.setPixelRatio( window.devicePixelRatio );
|
|
|
+ renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
+ document.body.appendChild( renderer.domElement );
|
|
|
+
|
|
|
+ scene = new THREE.Scene();
|
|
|
+
|
|
|
+ camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
|
|
|
+ camera.position.set( 0, 0, 1.5 );
|
|
|
+
|
|
|
+ new OrbitControls( camera, renderer.domElement );
|
|
|
+
|
|
|
+ // Sky
|
|
|
+
|
|
|
+ const canvas = document.createElement( 'canvas' );
|
|
|
+ canvas.width = 1;
|
|
|
+ canvas.height = 32;
|
|
|
+
|
|
|
+ const context = canvas.getContext( '2d' );
|
|
|
+ const gradient = context.createLinearGradient( 0, 0, 0, 32 );
|
|
|
+ gradient.addColorStop( 0.0, '#014a84' );
|
|
|
+ gradient.addColorStop( 0.5, '#0561a0' );
|
|
|
+ gradient.addColorStop( 1.0, '#437ab6' );
|
|
|
+ context.fillStyle = gradient;
|
|
|
+ context.fillRect( 0, 0, 1, 32 );
|
|
|
+
|
|
|
+ const sky = new THREE.Mesh(
|
|
|
+ new THREE.SphereGeometry( 10 ),
|
|
|
+ new THREE.MeshBasicMaterial( { map: new THREE.CanvasTexture( canvas ), side: THREE.BackSide } )
|
|
|
+ );
|
|
|
+ scene.add( sky );
|
|
|
+
|
|
|
+ // Texture
|
|
|
+
|
|
|
+ const texture = new THREE.DataTexture3D(
|
|
|
+ new Uint8Array( INITIAL_CLOUD_SIZE * INITIAL_CLOUD_SIZE * INITIAL_CLOUD_SIZE ).fill( 0 ),
|
|
|
+ INITIAL_CLOUD_SIZE,
|
|
|
+ INITIAL_CLOUD_SIZE,
|
|
|
+ INITIAL_CLOUD_SIZE
|
|
|
+ );
|
|
|
+ texture.format = THREE.RedFormat;
|
|
|
+ texture.minFilter = THREE.LinearFilter;
|
|
|
+ texture.magFilter = THREE.LinearFilter;
|
|
|
+ texture.unpackAlignment = 1;
|
|
|
+
|
|
|
+ cloudTexture = texture;
|
|
|
+
|
|
|
+ // Material
|
|
|
+
|
|
|
+ const vertexShader = /* glsl */`
|
|
|
+ in vec3 position;
|
|
|
+
|
|
|
+ uniform mat4 modelMatrix;
|
|
|
+ uniform mat4 modelViewMatrix;
|
|
|
+ uniform mat4 projectionMatrix;
|
|
|
+ uniform vec3 cameraPos;
|
|
|
+
|
|
|
+ out vec3 vOrigin;
|
|
|
+ out vec3 vDirection;
|
|
|
+
|
|
|
+ void main() {
|
|
|
+ vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );
|
|
|
+
|
|
|
+ vOrigin = vec3( inverse( modelMatrix ) * vec4( cameraPos, 1.0 ) ).xyz;
|
|
|
+ vDirection = position - vOrigin;
|
|
|
+
|
|
|
+ gl_Position = projectionMatrix * mvPosition;
|
|
|
+ }
|
|
|
+ `;
|
|
|
+
|
|
|
+ const fragmentShader = /* glsl */`
|
|
|
+ precision highp float;
|
|
|
+ precision highp sampler3D;
|
|
|
+
|
|
|
+ uniform mat4 modelViewMatrix;
|
|
|
+ uniform mat4 projectionMatrix;
|
|
|
+
|
|
|
+ in vec3 vOrigin;
|
|
|
+ in vec3 vDirection;
|
|
|
+
|
|
|
+ out vec4 color;
|
|
|
+
|
|
|
+ uniform vec3 base;
|
|
|
+ uniform sampler3D map;
|
|
|
+
|
|
|
+ uniform float threshold;
|
|
|
+ uniform float range;
|
|
|
+ uniform float opacity;
|
|
|
+ uniform float steps;
|
|
|
+ uniform float frame;
|
|
|
+
|
|
|
+ uint wang_hash(uint seed)
|
|
|
+ {
|
|
|
+ seed = (seed ^ 61u) ^ (seed >> 16u);
|
|
|
+ seed *= 9u;
|
|
|
+ seed = seed ^ (seed >> 4u);
|
|
|
+ seed *= 0x27d4eb2du;
|
|
|
+ seed = seed ^ (seed >> 15u);
|
|
|
+ return seed;
|
|
|
+ }
|
|
|
+
|
|
|
+ float randomFloat(inout uint seed)
|
|
|
+ {
|
|
|
+ return float(wang_hash(seed)) / 4294967296.;
|
|
|
+ }
|
|
|
+
|
|
|
+ vec2 hitBox( vec3 orig, vec3 dir ) {
|
|
|
+ const vec3 box_min = vec3( - 0.5 );
|
|
|
+ const vec3 box_max = vec3( 0.5 );
|
|
|
+ vec3 inv_dir = 1.0 / dir;
|
|
|
+ vec3 tmin_tmp = ( box_min - orig ) * inv_dir;
|
|
|
+ vec3 tmax_tmp = ( box_max - orig ) * inv_dir;
|
|
|
+ vec3 tmin = min( tmin_tmp, tmax_tmp );
|
|
|
+ vec3 tmax = max( tmin_tmp, tmax_tmp );
|
|
|
+ float t0 = max( tmin.x, max( tmin.y, tmin.z ) );
|
|
|
+ float t1 = min( tmax.x, min( tmax.y, tmax.z ) );
|
|
|
+ return vec2( t0, t1 );
|
|
|
+ }
|
|
|
+
|
|
|
+ float sample1( vec3 p ) {
|
|
|
+ return texture( map, p ).r;
|
|
|
+ }
|
|
|
+
|
|
|
+ float shading( vec3 coord ) {
|
|
|
+ float step = 0.01;
|
|
|
+ return sample1( coord + vec3( - step ) ) - sample1( coord + vec3( step ) );
|
|
|
+ }
|
|
|
+
|
|
|
+ void main(){
|
|
|
+ vec3 rayDir = normalize( vDirection );
|
|
|
+ vec2 bounds = hitBox( vOrigin, rayDir );
|
|
|
+
|
|
|
+ if ( bounds.x > bounds.y ) discard;
|
|
|
+
|
|
|
+ bounds.x = max( bounds.x, 0.0 );
|
|
|
+
|
|
|
+ vec3 p = vOrigin + bounds.x * rayDir;
|
|
|
+ vec3 inc = 1.0 / abs( rayDir );
|
|
|
+ float delta = min( inc.x, min( inc.y, inc.z ) );
|
|
|
+ delta /= steps;
|
|
|
+
|
|
|
+ // Jitter
|
|
|
+
|
|
|
+ // Nice little seed from
|
|
|
+ // https://blog.demofox.org/2020/05/25/casual-shadertoy-path-tracing-1-basic-camera-diffuse-emissive/
|
|
|
+ uint seed = uint( gl_FragCoord.x ) * uint( 1973 ) + uint( gl_FragCoord.y ) * uint( 9277 ) + uint( frame ) * uint( 26699 );
|
|
|
+ vec3 size = vec3( textureSize( map, 0 ) );
|
|
|
+ float randNum = randomFloat( seed ) * 2.0 - 1.0;
|
|
|
+ p += rayDir * randNum * ( 1.0 / size );
|
|
|
+
|
|
|
+ //
|
|
|
+
|
|
|
+ vec4 ac = vec4( base, 0.0 );
|
|
|
+
|
|
|
+ for ( float t = bounds.x; t < bounds.y; t += delta ) {
|
|
|
+
|
|
|
+ float d = sample1( p + 0.5 );
|
|
|
+
|
|
|
+ d = smoothstep( threshold - range, threshold + range, d ) * opacity;
|
|
|
+
|
|
|
+ float col = shading( p + 0.5 ) * 3.0 + ( ( p.x + p.y ) * 0.25 ) + 0.2;
|
|
|
+
|
|
|
+ ac.rgb += ( 1.0 - ac.a ) * d * col;
|
|
|
+
|
|
|
+ ac.a += ( 1.0 - ac.a ) * d;
|
|
|
+
|
|
|
+ if ( ac.a >= 0.95 ) break;
|
|
|
+
|
|
|
+ p += rayDir * delta;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ color = ac;
|
|
|
+
|
|
|
+ if ( color.a == 0.0 ) discard;
|
|
|
+
|
|
|
+ }
|
|
|
+ `;
|
|
|
+
|
|
|
+ const geometry = new THREE.BoxGeometry( 1, 1, 1 );
|
|
|
+ const material = new THREE.RawShaderMaterial( {
|
|
|
+ glslVersion: THREE.GLSL3,
|
|
|
+ uniforms: {
|
|
|
+ base: { value: new THREE.Color( 0x798aa0 ) },
|
|
|
+ map: { value: texture },
|
|
|
+ cameraPos: { value: new THREE.Vector3() },
|
|
|
+ threshold: { value: 0.25 },
|
|
|
+ opacity: { value: 0.25 },
|
|
|
+ range: { value: 0.1 },
|
|
|
+ steps: { value: 100 },
|
|
|
+ frame: { value: 0 }
|
|
|
+ },
|
|
|
+ vertexShader,
|
|
|
+ fragmentShader,
|
|
|
+ side: THREE.BackSide,
|
|
|
+ transparent: true
|
|
|
+ } );
|
|
|
+
|
|
|
+ mesh = new THREE.Mesh( geometry, material );
|
|
|
+ scene.add( mesh );
|
|
|
+
|
|
|
+ //
|
|
|
+
|
|
|
+ const parameters = {
|
|
|
+ threshold: 0.25,
|
|
|
+ opacity: 0.25,
|
|
|
+ range: 0.1,
|
|
|
+ steps: 100
|
|
|
+ };
|
|
|
+
|
|
|
+ function update() {
|
|
|
+
|
|
|
+ material.uniforms.threshold.value = parameters.threshold;
|
|
|
+ material.uniforms.opacity.value = parameters.opacity;
|
|
|
+ material.uniforms.range.value = parameters.range;
|
|
|
+ material.uniforms.steps.value = parameters.steps;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ const gui = new GUI();
|
|
|
+ gui.add( parameters, 'threshold', 0, 1, 0.01 ).onChange( update );
|
|
|
+ gui.add( parameters, 'opacity', 0, 1, 0.01 ).onChange( update );
|
|
|
+ gui.add( parameters, 'range', 0, 1, 0.01 ).onChange( update );
|
|
|
+ gui.add( parameters, 'steps', 0, 200, 1 ).onChange( update );
|
|
|
+
|
|
|
+ window.addEventListener( 'resize', onWindowResize );
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ function onWindowResize() {
|
|
|
+
|
|
|
+ camera.aspect = window.innerWidth / window.innerHeight;
|
|
|
+ camera.updateProjectionMatrix();
|
|
|
+
|
|
|
+ renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ let curr = 0;
|
|
|
+ const countPerRow = 4;
|
|
|
+ const countPerSlice = countPerRow * countPerRow;
|
|
|
+ const sliceCount = 4;
|
|
|
+ const totalCount = sliceCount * countPerSlice;
|
|
|
+ const margins = 8;
|
|
|
+
|
|
|
+ const perElementPaddedSize = ( INITIAL_CLOUD_SIZE - margins ) / countPerRow;
|
|
|
+ const perElementSize = Math.floor( ( INITIAL_CLOUD_SIZE - 1 ) / countPerRow );
|
|
|
+
|
|
|
+ function animate() {
|
|
|
+
|
|
|
+ requestAnimationFrame( animate );
|
|
|
+
|
|
|
+ const time = performance.now();
|
|
|
+ if ( time - prevTime > 1500.0 && curr < totalCount ) {
|
|
|
+
|
|
|
+ const position = new THREE.Vector3(
|
|
|
+ Math.floor( curr % countPerRow ) * perElementSize + margins * 0.5,
|
|
|
+ ( Math.floor( ( ( curr % countPerSlice ) / countPerRow ) ) ) * perElementSize + margins * 0.5,
|
|
|
+ Math.floor( curr / countPerSlice ) * perElementSize + margins * 0.5
|
|
|
+ ).floor();
|
|
|
+
|
|
|
+ const maxDimension = perElementPaddedSize - 1;
|
|
|
+ const box = new THREE.Box3( new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( maxDimension, maxDimension, maxDimension ) );
|
|
|
+ const scaleFactor = ( Math.random() + 0.5 ) * 0.5;
|
|
|
+ const source = generateCloudTexture( perElementPaddedSize, scaleFactor );
|
|
|
+
|
|
|
+ renderer.copyTextureToTexture3D( box, position, source, cloudTexture );
|
|
|
+
|
|
|
+ prevTime = time;
|
|
|
+
|
|
|
+ curr ++;
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ mesh.material.uniforms.cameraPos.value.copy( camera.position );
|
|
|
+ // mesh.rotation.y = - performance.now() / 7500;
|
|
|
+
|
|
|
+ mesh.material.uniforms.frame.value ++;
|
|
|
+
|
|
|
+ renderer.render( scene, camera );
|
|
|
+
|
|
|
+ }
|
|
|
+
|
|
|
+ </script>
|
|
|
+
|
|
|
+ </body>
|
|
|
+</html>
|
David Peicho