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webgl_clipping_advanced.html
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webgl_clipping_advanced.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Verge3D webgl - clipping planes - advanced</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>
<!-- 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 { GUI } from 'v3d/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'v3d/addons/controls/OrbitControls.js';
function planesFromMesh(vertices, indices) {
// creates a clipping volume from a convex triangular mesh
// specified by the arrays 'vertices' and 'indices'
const n = indices.length / 3,
result = new Array(n);
for (let i = 0, j = 0; i < n; ++ i, j += 3) {
const a = vertices[indices[j]],
b = vertices[indices[j + 1]],
c = vertices[indices[j + 2]];
result[i] = new v3d.Plane().
setFromCoplanarPoints(a, b, c);
}
return result;
}
function createPlanes(n) {
// creates an array of n uninitialized plane objects
const result = new Array(n);
for (let i = 0; i !== n; ++ i)
result[i] = new v3d.Plane();
return result;
}
function assignTransformedPlanes(planesOut, planesIn, matrix) {
// sets an array of existing planes to transformed 'planesIn'
for (let i = 0, n = planesIn.length; i !== n; ++ i)
planesOut[i].copy(planesIn[i]).applyMatrix4(matrix);
}
function cylindricalPlanes(n, innerRadius) {
const result = createPlanes(n);
for (let i = 0; i !== n; ++ i) {
const plane = result[i],
angle = i * Math.PI * 2 / n;
plane.normal.set(
Math.cos(angle), 0, Math.sin(angle));
plane.constant = innerRadius;
}
return result;
}
const planeToMatrix = (function() {
// creates a matrix that aligns X/Y to a given plane
// temporaries:
const xAxis = new v3d.Vector3(),
yAxis = new v3d.Vector3(),
trans = new v3d.Vector3();
return function planeToMatrix(plane) {
const zAxis = plane.normal,
matrix = new v3d.Matrix4();
// Hughes & Moeller '99
// "Building an Orthonormal Basis from a Unit Vector."
if (Math.abs(zAxis.x) > Math.abs(zAxis.z)) {
yAxis.set(-zAxis.y, zAxis.x, 0);
} else {
yAxis.set(0, - zAxis.z, zAxis.y);
}
xAxis.crossVectors(yAxis.normalize(), zAxis);
plane.coplanarPoint(trans);
return matrix.set(
xAxis.x, yAxis.x, zAxis.x, trans.x,
xAxis.y, yAxis.y, zAxis.y, trans.y,
xAxis.z, yAxis.z, zAxis.z, trans.z,
0, 0, 0, 1);
};
})();
// A regular tetrahedron for the clipping volume:
const Vertices = [
new v3d.Vector3(+ 1, 0, + Math.SQRT1_2),
new v3d.Vector3(- 1, 0, + Math.SQRT1_2),
new v3d.Vector3(0, + 1, - Math.SQRT1_2),
new v3d.Vector3(0, -1, - Math.SQRT1_2)
],
Indices = [
0, 1, 2, 0, 2, 3, 0, 3, 1, 1, 3, 2
],
Planes = planesFromMesh(Vertices, Indices),
PlaneMatrices = Planes.map(planeToMatrix),
GlobalClippingPlanes = cylindricalPlanes(5, 2.5),
Empty = Object.freeze([]);
let camera, scene, renderer, startTime, stats,
object, clipMaterial,
volumeVisualization,
globalClippingPlanes;
function init() {
camera = new v3d.PerspectiveCamera(
36, window.innerWidth / window.innerHeight, 0.25, 16);
camera.position.set(0, 1.5, 3);
scene = new v3d.Scene();
// Lights
scene.add(new v3d.AmbientLight(0xffffff, 0.3));
const spotLight = new v3d.SpotLight(0xffffff, 0.5);
spotLight.angle = Math.PI / 5;
spotLight.penumbra = 0.2;
spotLight.position.set(2, 3, 3);
spotLight.castShadow = true;
spotLight.shadow.camera.near = 3;
spotLight.shadow.camera.far = 10;
spotLight.shadow.mapSize.width = 1024;
spotLight.shadow.mapSize.height = 1024;
scene.add(spotLight);
const dirLight = new v3d.DirectionalLight(0xffffff, 0.5);
dirLight.position.set(0, 2, 0);
dirLight.castShadow = true;
dirLight.shadow.camera.near = 1;
dirLight.shadow.camera.far = 10;
dirLight.shadow.camera.right = 1;
dirLight.shadow.camera.left = -1;
dirLight.shadow.camera.top = 1;
dirLight.shadow.camera.bottom = -1;
dirLight.shadow.mapSize.width = 1024;
dirLight.shadow.mapSize.height = 1024;
scene.add(dirLight);
// Geometry
clipMaterial = new v3d.MeshPhongMaterial({
color: 0xee0a10,
shininess: 100,
side: v3d.DoubleSide,
// Clipping setup:
clippingPlanes: createPlanes(Planes.length),
clipShadows: true
});
object = new v3d.Group();
const geometry = new v3d.BoxGeometry(0.18, 0.18, 0.18);
for (let z = -2; z <= 2; ++ z)
for (let y = -2; y <= 2; ++ y)
for (let x = -2; x <= 2; ++ x) {
const mesh = new v3d.Mesh(geometry, clipMaterial);
mesh.position.set(x / 5, y / 5, z / 5);
mesh.castShadow = true;
object.add(mesh);
}
scene.add(object);
const planeGeometry = new v3d.PlaneGeometry(3, 3, 1, 1),
color = new v3d.Color();
volumeVisualization = new v3d.Group();
volumeVisualization.visible = false;
for (let i = 0, n = Planes.length; i !== n; ++ i) {
const material = new v3d.MeshBasicMaterial({
color: color.setHSL(i / n, 0.5, 0.5).getHex(),
side: v3d.DoubleSide,
opacity: 0.2,
transparent: true,
// clip to the others to show the volume (wildly
// intersecting transparent planes look bad)
clippingPlanes: clipMaterial.clippingPlanes.
filter(function(_, j) {
return j !== i;
})
// no need to enable shadow clipping - the plane
// visualization does not cast shadows
});
const mesh = new v3d.Mesh(planeGeometry, material);
mesh.matrixAutoUpdate = false;
volumeVisualization.add(mesh);
}
scene.add(volumeVisualization);
const ground = new v3d.Mesh(planeGeometry,
new v3d.MeshPhongMaterial({
color: 0xa0adaf, shininess: 10 }));
ground.rotation.x = - Math.PI / 2;
ground.scale.multiplyScalar(3);
ground.receiveShadow = true;
scene.add(ground);
// Renderer
const container = document.body;
renderer = new v3d.WebGLRenderer();
renderer.shadowMap.enabled = true;
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
window.addEventListener('resize', onWindowResize);
container.appendChild(renderer.domElement);
// Clipping setup:
globalClippingPlanes = createPlanes(GlobalClippingPlanes.length);
renderer.clippingPlanes = Empty;
renderer.localClippingEnabled = true;
// Stats
stats = new Stats();
container.appendChild(stats.dom);
// Controls
const controls = new OrbitControls(camera, renderer.domElement);
controls.minDistance = 1;
controls.maxDistance = 8;
controls.target.set(0, 1, 0);
controls.update();
// GUI
const gui = new GUI(),
folder = gui.addFolder('Local Clipping'),
props = {
get 'Enabled'() {
return renderer.localClippingEnabled;
},
set 'Enabled'(v) {
renderer.localClippingEnabled = v;
if (!v) volumeVisualization.visible = false;
},
get 'Shadows'() {
return clipMaterial.clipShadows;
},
set 'Shadows'(v) {
clipMaterial.clipShadows = v;
},
get 'Visualize'() {
return volumeVisualization.visible;
},
set 'Visualize'(v) {
if (renderer.localClippingEnabled)
volumeVisualization.visible = v;
}
};
folder.add(props, 'Enabled');
folder.add(props, 'Shadows');
folder.add(props, 'Visualize').listen();
gui.addFolder('Global Clipping').
add({
get 'Enabled'() {
return renderer.clippingPlanes !== Empty;
},
set 'Enabled'(v) {
renderer.clippingPlanes = v ?
globalClippingPlanes : Empty;
}
}, 'Enabled');
// Start
startTime = Date.now();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function setObjectWorldMatrix(object, matrix) {
// set the orientation of an object based on a world matrix
const parent = object.parent;
scene.updateMatrixWorld();
object.matrix.copy(parent.matrixWorld).invert();
object.applyMatrix4(matrix);
}
const transform = new v3d.Matrix4(),
tmpMatrix = new v3d.Matrix4();
function animate() {
const currentTime = Date.now(),
time = (currentTime - startTime) / 1000;
requestAnimationFrame(animate);
object.position.y = 1;
object.rotation.x = time * 0.5;
object.rotation.y = time * 0.2;
object.updateMatrix();
transform.copy(object.matrix);
const bouncy = Math.cos(time * .5) * 0.5 + 0.7;
transform.multiply(
tmpMatrix.makeScale(bouncy, bouncy, bouncy));
assignTransformedPlanes(
clipMaterial.clippingPlanes, Planes, transform);
const planeMeshes = volumeVisualization.children;
for (let i = 0, n = planeMeshes.length; i !== n; ++ i) {
tmpMatrix.multiplyMatrices(transform, PlaneMatrices[i]);
setObjectWorldMatrix(planeMeshes[i], tmpMatrix);
}
transform.makeRotationY(time * 0.1);
assignTransformedPlanes(globalClippingPlanes, GlobalClippingPlanes, transform);
stats.begin();
renderer.render(scene, camera);
stats.end();
}
init();
animate();
</script>
</body>
</html>