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webgl2_volume_perlin.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D 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://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> webgl2 - volume
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import { OrbitControls } from 'v3d/addons/controls/OrbitControls.js';
import { ImprovedNoise } from 'v3d/addons/math/ImprovedNoise.js';
import { GUI } from 'v3d/addons/libs/lil-gui.module.min.js';
import WebGL from 'v3d/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 v3d.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
scene = new v3d.Scene();
camera = new v3d.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 v3d.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 v3d.Data3DTexture(data, size, size, size);
texture.format = v3d.RedFormat;
texture.minFilter = v3d.LinearFilter;
texture.magFilter = v3d.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 v3d.BoxGeometry(1, 1, 1);
const material = new v3d.RawShaderMaterial({
glslVersion: v3d.GLSL3,
uniforms: {
map: { value: texture },
cameraPos: { value: new v3d.Vector3() },
threshold: { value: 0.6 },
steps: { value: 200 }
},
vertexShader,
fragmentShader,
side: v3d.BackSide,
});
mesh = new v3d.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>