You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
265 lines
6.6 KiB
265 lines
6.6 KiB
2 years ago
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>three.js webgl2 - volume</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
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<!-- Import maps polyfill -->
|
||
|
|
<!-- Remove this when import maps will be widely supported -->
|
||
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
|
||
|
|
import { ImprovedNoise } from 'three/addons/math/ImprovedNoise.js';
|
||
|
|
|
||
|
|
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
|
||
|
|
import WebGL from 'three/addons/capabilities/WebGL.js';
|
||
|
|
|
||
|
|
if ( WebGL.isWebGL2Available() === false ) {
|
||
|
|
|
||
|
|
document.body.appendChild( WebGL.getWebGL2ErrorMessage() );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
let renderer, scene, camera;
|
||
|
|
let mesh;
|
||
|
|
|
||
|
|
init();
|
||
|
|
animate();
|
||
|
|
|
||
|
|
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, 2 );
|
||
|
|
|
||
|
|
new OrbitControls( camera, renderer.domElement );
|
||
|
|
|
||
|
|
// Texture
|
||
|
|
|
||
|
|
const size = 128;
|
||
|
|
const data = new Uint8Array( size * size * 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 ++ ) {
|
||
|
|
|
||
|
|
vector.set( x, y, z ).divideScalar( size );
|
||
|
|
|
||
|
|
const d = perlin.noise( vector.x * 6.5, vector.y * 6.5, vector.z * 6.5 );
|
||
|
|
|
||
|
|
data[ i ++ ] = d * 128 + 128;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const texture = new THREE.Data3DTexture( data, size, size, size );
|
||
|
|
texture.format = THREE.RedFormat;
|
||
|
|
texture.minFilter = THREE.LinearFilter;
|
||
|
|
texture.magFilter = THREE.LinearFilter;
|
||
|
|
texture.unpackAlignment = 1;
|
||
|
|
texture.needsUpdate = true;
|
||
|
|
|
||
|
|
// 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 sampler3D map;
|
||
|
|
|
||
|
|
uniform float threshold;
|
||
|
|
uniform float steps;
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define epsilon .0001
|
||
|
|
|
||
|
|
vec3 normal( vec3 coord ) {
|
||
|
|
if ( coord.x < epsilon ) return vec3( 1.0, 0.0, 0.0 );
|
||
|
|
if ( coord.y < epsilon ) return vec3( 0.0, 1.0, 0.0 );
|
||
|
|
if ( coord.z < epsilon ) return vec3( 0.0, 0.0, 1.0 );
|
||
|
|
if ( coord.x > 1.0 - epsilon ) return vec3( - 1.0, 0.0, 0.0 );
|
||
|
|
if ( coord.y > 1.0 - epsilon ) return vec3( 0.0, - 1.0, 0.0 );
|
||
|
|
if ( coord.z > 1.0 - epsilon ) return vec3( 0.0, 0.0, - 1.0 );
|
||
|
|
|
||
|
|
float step = 0.01;
|
||
|
|
float x = sample1( coord + vec3( - step, 0.0, 0.0 ) ) - sample1( coord + vec3( step, 0.0, 0.0 ) );
|
||
|
|
float y = sample1( coord + vec3( 0.0, - step, 0.0 ) ) - sample1( coord + vec3( 0.0, step, 0.0 ) );
|
||
|
|
float z = sample1( coord + vec3( 0.0, 0.0, - step ) ) - sample1( coord + vec3( 0.0, 0.0, step ) );
|
||
|
|
|
||
|
|
return normalize( vec3( x, y, z ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
|
||
|
|
for ( float t = bounds.x; t < bounds.y; t += delta ) {
|
||
|
|
|
||
|
|
float d = sample1( p + 0.5 );
|
||
|
|
|
||
|
|
if ( d > threshold ) {
|
||
|
|
|
||
|
|
color.rgb = normal( p + 0.5 ) * 0.5 + ( p * 1.5 + 0.25 );
|
||
|
|
color.a = 1.;
|
||
|
|
break;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
p += rayDir * delta;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( color.a == 0.0 ) discard;
|
||
|
|
|
||
|
|
}
|
||
|
|
`;
|
||
|
|
|
||
|
|
const geometry = new THREE.BoxGeometry( 1, 1, 1 );
|
||
|
|
const material = new THREE.RawShaderMaterial( {
|
||
|
|
glslVersion: THREE.GLSL3,
|
||
|
|
uniforms: {
|
||
|
|
map: { value: texture },
|
||
|
|
cameraPos: { value: new THREE.Vector3() },
|
||
|
|
threshold: { value: 0.6 },
|
||
|
|
steps: { value: 200 }
|
||
|
|
},
|
||
|
|
vertexShader,
|
||
|
|
fragmentShader,
|
||
|
|
side: THREE.BackSide,
|
||
|
|
} );
|
||
|
|
|
||
|
|
mesh = new THREE.Mesh( geometry, material );
|
||
|
|
scene.add( mesh );
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const parameters = { threshold: 0.6, steps: 200 };
|
||
|
|
|
||
|
|
function update() {
|
||
|
|
|
||
|
|
material.uniforms.threshold.value = parameters.threshold;
|
||
|
|
material.uniforms.steps.value = parameters.steps;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
const gui = new GUI();
|
||
|
|
gui.add( parameters, 'threshold', 0, 1, 0.01 ).onChange( update );
|
||
|
|
gui.add( parameters, 'steps', 0, 300, 1 ).onChange( update );
|
||
|
|
|
||
|
|
window.addEventListener( 'resize', onWindowResize );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
function onWindowResize() {
|
||
|
|
|
||
|
|
camera.aspect = window.innerWidth / window.innerHeight;
|
||
|
|
camera.updateProjectionMatrix();
|
||
|
|
|
||
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
function animate() {
|
||
|
|
|
||
|
|
requestAnimationFrame( animate );
|
||
|
|
|
||
|
|
mesh.material.uniforms.cameraPos.value.copy( camera.position );
|
||
|
|
|
||
|
|
renderer.render( scene, camera );
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
</script>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|