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webgl_shadowmap_pcss.html
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webgl_shadowmap_pcss.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - percent closer soft-shadows</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">
<style>
body {
background-color: #cce0ff;
color: #000;
}
a {
color: #08f;
}
</style>
</head>
<body>
<div id="info">Percent Closer Soft-Shadows (PCSS) by <a href="http://eduperiment.com">spidersharma03</a></div>
<script type="x-shader/x-fragment" id="PCSS">
#define LIGHT_WORLD_SIZE 0.005
#define LIGHT_FRUSTUM_WIDTH 3.75
#define LIGHT_SIZE_UV (LIGHT_WORLD_SIZE / LIGHT_FRUSTUM_WIDTH)
#define NEAR_PLANE 9.5
#define NUM_SAMPLES 17
#define NUM_RINGS 11
#define BLOCKER_SEARCH_NUM_SAMPLES NUM_SAMPLES
vec2 poissonDisk[NUM_SAMPLES];
void initPoissonSamples(const in vec2 randomSeed) {
float ANGLE_STEP = PI2 * float(NUM_RINGS) / float(NUM_SAMPLES);
float INV_NUM_SAMPLES = 1.0 / float(NUM_SAMPLES);
// jsfiddle that shows sample pattern: https://jsfiddle.net/a16ff1p7/
float angle = rand(randomSeed) * PI2;
float radius = INV_NUM_SAMPLES;
float radiusStep = radius;
for(int i = 0; i < NUM_SAMPLES; i++) {
poissonDisk[i] = vec2(cos(angle), sin(angle)) * pow(radius, 0.75);
radius += radiusStep;
angle += ANGLE_STEP;
}
}
float penumbraSize(const in float zReceiver, const in float zBlocker) { // Parallel plane estimation
return (zReceiver - zBlocker) / zBlocker;
}
float findBlocker(sampler2D shadowMap, const in vec2 uv, const in float zReceiver) {
// This uses similar triangles to compute what
// area of the shadow map we should search
float searchRadius = LIGHT_SIZE_UV * (zReceiver - NEAR_PLANE) / zReceiver;
float blockerDepthSum = 0.0;
int numBlockers = 0;
for(int i = 0; i < BLOCKER_SEARCH_NUM_SAMPLES; i++) {
float shadowMapDepth = unpackRGBAToDepth(texture2D(shadowMap, uv + poissonDisk[i] * searchRadius));
if (shadowMapDepth < zReceiver) {
blockerDepthSum += shadowMapDepth;
numBlockers ++;
}
}
if(numBlockers == 0) return -1.0;
return blockerDepthSum / float(numBlockers);
}
float PCF_Filter(sampler2D shadowMap, vec2 uv, float zReceiver, float filterRadius) {
float sum = 0.0;
float depth;
#pragma unroll_loop_start
for(int i = 0; i < 17; i++) {
depth = unpackRGBAToDepth(texture2D(shadowMap, uv + poissonDisk[i] * filterRadius));
if(zReceiver <= depth) sum += 1.0;
}
#pragma unroll_loop_end
#pragma unroll_loop_start
for(int i = 0; i < 17; i++) {
depth = unpackRGBAToDepth(texture2D(shadowMap, uv + -poissonDisk[i].yx * filterRadius));
if(zReceiver <= depth) sum += 1.0;
}
#pragma unroll_loop_end
return sum / (2.0 * float(17));
}
float PCSS (sampler2D shadowMap, vec4 coords) {
vec2 uv = coords.xy;
float zReceiver = coords.z; // Assumed to be eye-space z in this code
initPoissonSamples(uv);
// STEP 1: blocker search
float avgBlockerDepth = findBlocker(shadowMap, uv, zReceiver);
//There are no occluders so early out (this saves filtering)
if(avgBlockerDepth == -1.0) return 1.0;
// STEP 2: penumbra size
float penumbraRatio = penumbraSize(zReceiver, avgBlockerDepth);
float filterRadius = penumbraRatio * LIGHT_SIZE_UV * NEAR_PLANE / zReceiver;
// STEP 3: filtering
//return avgBlockerDepth;
return PCF_Filter(shadowMap, uv, zReceiver, filterRadius);
}
</script>
<script type="x-shader/x-fragment" id="PCSSGetShadow">
return PCSS(shadowMap, shadowCoord);
</script>
<!-- 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": {
"v3d": "../build/v3d.module.js",
"v3d/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as v3d from 'v3d';
import Stats from 'v3d/addons/libs/stats.module.js';
import { OrbitControls } from 'v3d/addons/controls/OrbitControls.js';
let stats;
let camera, scene, renderer;
let group;
init();
animate();
function init() {
const container = document.createElement('div');
document.body.appendChild(container);
// scene
scene = new v3d.Scene();
scene.fog = new v3d.Fog(0xcce0ff, 5, 100);
// camera
camera = new v3d.PerspectiveCamera(30, window.innerWidth / window.innerHeight, 1, 10000);
// We use this particular camera position in order to expose a bug that can sometimes happen presumably
// due to lack of precision when interpolating values over really large triangles.
// It reproduced on at least NVIDIA GTX 1080 and GTX 1050 Ti GPUs when the ground plane was not
// subdivided into segments.
camera.position.x = 7;
camera.position.y = 13;
camera.position.z = 7;
scene.add(camera);
// lights
scene.add(new v3d.AmbientLight(0x666666));
const light = new v3d.DirectionalLight(0xdfebff, 1.75);
light.position.set(2, 8, 4);
light.castShadow = true;
light.shadow.mapSize.width = 1024;
light.shadow.mapSize.height = 1024;
light.shadow.camera.far = 20;
scene.add(light);
// scene.add(new DirectionalLightHelper(light));
scene.add(new v3d.CameraHelper(light.shadow.camera));
// group
group = new v3d.Group();
scene.add(group);
const geometry = new v3d.SphereGeometry(0.3, 20, 20);
for (let i = 0; i < 20; i++) {
const material = new v3d.MeshPhongMaterial({ color: Math.random() * 0xffffff });
const sphere = new v3d.Mesh(geometry, material);
sphere.position.x = Math.random() -0.5;
sphere.position.z = Math.random() -0.5;
sphere.position.normalize();
sphere.position.multiplyScalar(Math.random() * 2 + 1);
sphere.castShadow = true;
sphere.receiveShadow = true;
sphere.userData.phase = Math.random() * Math.PI;
group.add(sphere);
}
// ground
const groundMaterial = new v3d.MeshPhongMaterial({ color: 0x404040, specular: 0x111111 });
const ground = new v3d.Mesh(new v3d.PlaneGeometry(20000, 20000, 8, 8), groundMaterial);
ground.rotation.x = - Math.PI / 2;
ground.receiveShadow = true;
scene.add(ground);
// column
const column = new v3d.Mesh(new v3d.BoxGeometry(1, 4, 1), groundMaterial);
column.position.y = 2;
column.castShadow = true;
column.receiveShadow = true;
scene.add(column);
// overwrite shadowmap code
let shader = v3d.ShaderChunk.shadowmap_pars_fragment;
shader = shader.replace(
'#ifdef USE_SHADOWMAP',
'#ifdef USE_SHADOWMAP' +
document.getElementById('PCSS').textContent
);
shader = shader.replace(
'#if defined(SHADOWMAP_TYPE_PCF)',
document.getElementById('PCSSGetShadow').textContent +
'#if defined(SHADOWMAP_TYPE_PCF)'
);
v3d.ShaderChunk.shadowmap_pars_fragment = shader;
// renderer
renderer = new v3d.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(scene.fog.color);
container.appendChild(renderer.domElement);
renderer.outputEncoding = v3d.sRGBEncoding;
renderer.shadowMap.enabled = true;
// controls
const controls = new OrbitControls(camera, renderer.domElement);
controls.maxPolarAngle = Math.PI * 0.5;
controls.minDistance = 10;
controls.maxDistance = 75;
controls.target.set(0, 2.5, 0);
controls.update();
// performance monitor
stats = new Stats();
container.appendChild(stats.dom);
//
window.addEventListener('resize', onWindowResize);
}
//
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
//
function animate() {
const time = performance.now() / 1000;
group.traverse(function(child) {
if ('phase' in child.userData) {
child.position.y = Math.abs(Math.sin(time + child.userData.phase)) * 4 + 0.3;
}
});
renderer.render(scene, camera);
stats.update();
requestAnimationFrame(animate);
}
</script>
</body>
</html>