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webgl_clipping_stencil.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - clipping stencil</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> - solid geometry with clip planes and stencil materials</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 { GUI } from 'v3d/addons/libs/lil-gui.module.min.js';
import Stats from 'v3d/addons/libs/stats.module.js';
let camera, scene, renderer, object, stats;
let planes, planeObjects, planeHelpers;
let clock;
const params = {
animate: true,
planeX: {
constant: 0,
negated: false,
displayHelper: false
},
planeY: {
constant: 0,
negated: false,
displayHelper: false
},
planeZ: {
constant: 0,
negated: false,
displayHelper: false
}
};
init();
animate();
function createPlaneStencilGroup(geometry, plane, renderOrder) {
const group = new v3d.Group();
const baseMat = new v3d.MeshBasicMaterial();
baseMat.depthWrite = false;
baseMat.depthTest = false;
baseMat.colorWrite = false;
baseMat.stencilWrite = true;
baseMat.stencilFunc = v3d.AlwaysStencilFunc;
// back faces
const mat0 = baseMat.clone();
mat0.side = v3d.BackSide;
mat0.clippingPlanes = [plane];
mat0.stencilFail = v3d.IncrementWrapStencilOp;
mat0.stencilZFail = v3d.IncrementWrapStencilOp;
mat0.stencilZPass = v3d.IncrementWrapStencilOp;
const mesh0 = new v3d.Mesh(geometry, mat0);
mesh0.renderOrder = renderOrder;
group.add(mesh0);
// front faces
const mat1 = baseMat.clone();
mat1.side = v3d.FrontSide;
mat1.clippingPlanes = [plane];
mat1.stencilFail = v3d.DecrementWrapStencilOp;
mat1.stencilZFail = v3d.DecrementWrapStencilOp;
mat1.stencilZPass = v3d.DecrementWrapStencilOp;
const mesh1 = new v3d.Mesh(geometry, mat1);
mesh1.renderOrder = renderOrder;
group.add(mesh1);
return group;
}
function init() {
clock = new v3d.Clock();
scene = new v3d.Scene();
camera = new v3d.PerspectiveCamera(36, window.innerWidth / window.innerHeight, 1, 100);
camera.position.set(2, 2, 2);
scene.add(new v3d.AmbientLight(0xffffff, 0.5));
const dirLight = new v3d.DirectionalLight(0xffffff, 1);
dirLight.position.set(5, 10, 7.5);
dirLight.castShadow = true;
dirLight.shadow.camera.right = 2;
dirLight.shadow.camera.left = -2;
dirLight.shadow.camera.top = 2;
dirLight.shadow.camera.bottom = -2;
dirLight.shadow.mapSize.width = 1024;
dirLight.shadow.mapSize.height = 1024;
scene.add(dirLight);
planes = [
new v3d.Plane(new v3d.Vector3(- 1, 0, 0), 0),
new v3d.Plane(new v3d.Vector3(0, -1, 0), 0),
new v3d.Plane(new v3d.Vector3(0, 0, -1), 0)
];
planeHelpers = planes.map(p => new v3d.PlaneHelper(p, 2, 0xffffff));
planeHelpers.forEach(ph => {
ph.visible = false;
scene.add(ph);
});
const geometry = new v3d.TorusKnotGeometry(0.4, 0.15, 220, 60);
object = new v3d.Group();
scene.add(object);
// Set up clip plane rendering
planeObjects = [];
const planeGeom = new v3d.PlaneGeometry(4, 4);
for (let i = 0; i < 3; i++) {
const poGroup = new v3d.Group();
const plane = planes[i];
const stencilGroup = createPlaneStencilGroup(geometry, plane, i + 1);
// plane is clipped by the other clipping planes
const planeMat =
new v3d.MeshStandardMaterial({
color: 0xE91E63,
metalness: 0.1,
roughness: 0.75,
clippingPlanes: planes.filter(p => p !== plane),
stencilWrite: true,
stencilRef: 0,
stencilFunc: v3d.NotEqualStencilFunc,
stencilFail: v3d.ReplaceStencilOp,
stencilZFail: v3d.ReplaceStencilOp,
stencilZPass: v3d.ReplaceStencilOp,
});
const po = new v3d.Mesh(planeGeom, planeMat);
po.onAfterRender = function(renderer) {
renderer.clearStencil();
};
po.renderOrder = i + 1.1;
object.add(stencilGroup);
poGroup.add(po);
planeObjects.push(po);
scene.add(poGroup);
}
const material = new v3d.MeshStandardMaterial({
color: 0xFFC107,
metalness: 0.1,
roughness: 0.75,
clippingPlanes: planes,
clipShadows: true,
shadowSide: v3d.DoubleSide,
});
// add the color
const clippedColorFront = new v3d.Mesh(geometry, material);
clippedColorFront.castShadow = true;
clippedColorFront.renderOrder = 6;
object.add(clippedColorFront);
const ground = new v3d.Mesh(
new v3d.PlaneGeometry(9, 9, 1, 1),
new v3d.ShadowMaterial({ color: 0x000000, opacity: 0.25, side: v3d.DoubleSide })
);
ground.rotation.x = - Math.PI / 2; // rotates X/Y to X/Z
ground.position.y = -1;
ground.receiveShadow = true;
scene.add(ground);
// Stats
stats = new Stats();
document.body.appendChild(stats.dom);
// Renderer
renderer = new v3d.WebGLRenderer({ antialias: true });
renderer.shadowMap.enabled = true;
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0x263238);
window.addEventListener('resize', onWindowResize);
document.body.appendChild(renderer.domElement);
renderer.localClippingEnabled = true;
// Controls
const controls = new OrbitControls(camera, renderer.domElement);
controls.minDistance = 2;
controls.maxDistance = 20;
controls.update();
// GUI
const gui = new GUI();
gui.add(params, 'animate');
const planeX = gui.addFolder('planeX');
planeX.add(params.planeX, 'displayHelper').onChange(v => planeHelpers[0].visible = v);
planeX.add(params.planeX, 'constant').min(- 1).max(1).onChange(d => planes[0].constant = d);
planeX.add(params.planeX, 'negated').onChange(() => {
planes[0].negate();
params.planeX.constant = planes[0].constant;
});
planeX.open();
const planeY = gui.addFolder('planeY');
planeY.add(params.planeY, 'displayHelper').onChange(v => planeHelpers[1].visible = v);
planeY.add(params.planeY, 'constant').min(- 1).max(1).onChange(d => planes[1].constant = d);
planeY.add(params.planeY, 'negated').onChange(() => {
planes[1].negate();
params.planeY.constant = planes[1].constant;
});
planeY.open();
const planeZ = gui.addFolder('planeZ');
planeZ.add(params.planeZ, 'displayHelper').onChange(v => planeHelpers[2].visible = v);
planeZ.add(params.planeZ, 'constant').min(- 1).max(1).onChange(d => planes[2].constant = d);
planeZ.add(params.planeZ, 'negated').onChange(() => {
planes[2].negate();
params.planeZ.constant = planes[2].constant;
});
planeZ.open();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
const delta = clock.getDelta();
requestAnimationFrame(animate);
if (params.animate) {
object.rotation.x += delta * 0.5;
object.rotation.y += delta * 0.2;
}
for (let i = 0; i < planeObjects.length; i++) {
const plane = planes[i];
const po = planeObjects[i];
plane.coplanarPoint(po.position);
po.lookAt(
po.position.x - plane.normal.x,
po.position.y - plane.normal.y,
po.position.z - plane.normal.z,
);
}
stats.begin();
renderer.render(scene, camera);
stats.end();
}
</script>
</body>
</html>