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323 lines
8.4 KiB
323 lines
8.4 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - clipping stencil</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - solid geometry with clip planes and stencil materials</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import Stats from 'three/addons/libs/stats.module.js';
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let camera, scene, renderer, object, stats;
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let planes, planeObjects, planeHelpers;
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let clock;
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const params = {
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animate: true,
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planeX: {
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constant: 0,
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negated: false,
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displayHelper: false
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},
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planeY: {
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constant: 0,
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negated: false,
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displayHelper: false
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},
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planeZ: {
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constant: 0,
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negated: false,
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displayHelper: false
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}
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};
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init();
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animate();
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function createPlaneStencilGroup( geometry, plane, renderOrder ) {
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const group = new THREE.Group();
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const baseMat = new THREE.MeshBasicMaterial();
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baseMat.depthWrite = false;
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baseMat.depthTest = false;
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baseMat.colorWrite = false;
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baseMat.stencilWrite = true;
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baseMat.stencilFunc = THREE.AlwaysStencilFunc;
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// back faces
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const mat0 = baseMat.clone();
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mat0.side = THREE.BackSide;
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mat0.clippingPlanes = [ plane ];
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mat0.stencilFail = THREE.IncrementWrapStencilOp;
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mat0.stencilZFail = THREE.IncrementWrapStencilOp;
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mat0.stencilZPass = THREE.IncrementWrapStencilOp;
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const mesh0 = new THREE.Mesh( geometry, mat0 );
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mesh0.renderOrder = renderOrder;
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group.add( mesh0 );
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// front faces
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const mat1 = baseMat.clone();
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mat1.side = THREE.FrontSide;
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mat1.clippingPlanes = [ plane ];
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mat1.stencilFail = THREE.DecrementWrapStencilOp;
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mat1.stencilZFail = THREE.DecrementWrapStencilOp;
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mat1.stencilZPass = THREE.DecrementWrapStencilOp;
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const mesh1 = new THREE.Mesh( geometry, mat1 );
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mesh1.renderOrder = renderOrder;
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group.add( mesh1 );
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return group;
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}
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function init() {
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clock = new THREE.Clock();
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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera( 36, window.innerWidth / window.innerHeight, 1, 100 );
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camera.position.set( 2, 2, 2 );
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scene.add( new THREE.AmbientLight( 0xffffff, 0.5 ) );
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const dirLight = new THREE.DirectionalLight( 0xffffff, 1 );
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dirLight.position.set( 5, 10, 7.5 );
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dirLight.castShadow = true;
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dirLight.shadow.camera.right = 2;
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dirLight.shadow.camera.left = - 2;
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dirLight.shadow.camera.top = 2;
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dirLight.shadow.camera.bottom = - 2;
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dirLight.shadow.mapSize.width = 1024;
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dirLight.shadow.mapSize.height = 1024;
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scene.add( dirLight );
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planes = [
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new THREE.Plane( new THREE.Vector3( - 1, 0, 0 ), 0 ),
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new THREE.Plane( new THREE.Vector3( 0, - 1, 0 ), 0 ),
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new THREE.Plane( new THREE.Vector3( 0, 0, - 1 ), 0 )
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];
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planeHelpers = planes.map( p => new THREE.PlaneHelper( p, 2, 0xffffff ) );
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planeHelpers.forEach( ph => {
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ph.visible = false;
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scene.add( ph );
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} );
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const geometry = new THREE.TorusKnotGeometry( 0.4, 0.15, 220, 60 );
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object = new THREE.Group();
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scene.add( object );
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// Set up clip plane rendering
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planeObjects = [];
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const planeGeom = new THREE.PlaneGeometry( 4, 4 );
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for ( let i = 0; i < 3; i ++ ) {
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const poGroup = new THREE.Group();
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const plane = planes[ i ];
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const stencilGroup = createPlaneStencilGroup( geometry, plane, i + 1 );
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// plane is clipped by the other clipping planes
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const planeMat =
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new THREE.MeshStandardMaterial( {
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color: 0xE91E63,
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metalness: 0.1,
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roughness: 0.75,
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clippingPlanes: planes.filter( p => p !== plane ),
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stencilWrite: true,
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stencilRef: 0,
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stencilFunc: THREE.NotEqualStencilFunc,
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stencilFail: THREE.ReplaceStencilOp,
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stencilZFail: THREE.ReplaceStencilOp,
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stencilZPass: THREE.ReplaceStencilOp,
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} );
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const po = new THREE.Mesh( planeGeom, planeMat );
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po.onAfterRender = function ( renderer ) {
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renderer.clearStencil();
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};
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po.renderOrder = i + 1.1;
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object.add( stencilGroup );
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poGroup.add( po );
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planeObjects.push( po );
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scene.add( poGroup );
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}
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const material = new THREE.MeshStandardMaterial( {
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color: 0xFFC107,
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metalness: 0.1,
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roughness: 0.75,
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clippingPlanes: planes,
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clipShadows: true,
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shadowSide: THREE.DoubleSide,
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} );
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// add the color
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const clippedColorFront = new THREE.Mesh( geometry, material );
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clippedColorFront.castShadow = true;
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clippedColorFront.renderOrder = 6;
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object.add( clippedColorFront );
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const ground = new THREE.Mesh(
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new THREE.PlaneGeometry( 9, 9, 1, 1 ),
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new THREE.ShadowMaterial( { color: 0x000000, opacity: 0.25, side: THREE.DoubleSide } )
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);
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ground.rotation.x = - Math.PI / 2; // rotates X/Y to X/Z
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ground.position.y = - 1;
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ground.receiveShadow = true;
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scene.add( ground );
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// Stats
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stats = new Stats();
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document.body.appendChild( stats.dom );
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// Renderer
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.shadowMap.enabled = true;
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.setClearColor( 0x263238 );
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window.addEventListener( 'resize', onWindowResize );
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document.body.appendChild( renderer.domElement );
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renderer.localClippingEnabled = true;
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// Controls
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.minDistance = 2;
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controls.maxDistance = 20;
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controls.update();
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// GUI
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const gui = new GUI();
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gui.add( params, 'animate' );
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const planeX = gui.addFolder( 'planeX' );
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planeX.add( params.planeX, 'displayHelper' ).onChange( v => planeHelpers[ 0 ].visible = v );
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planeX.add( params.planeX, 'constant' ).min( - 1 ).max( 1 ).onChange( d => planes[ 0 ].constant = d );
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planeX.add( params.planeX, 'negated' ).onChange( () => {
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planes[ 0 ].negate();
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params.planeX.constant = planes[ 0 ].constant;
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} );
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planeX.open();
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const planeY = gui.addFolder( 'planeY' );
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planeY.add( params.planeY, 'displayHelper' ).onChange( v => planeHelpers[ 1 ].visible = v );
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planeY.add( params.planeY, 'constant' ).min( - 1 ).max( 1 ).onChange( d => planes[ 1 ].constant = d );
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planeY.add( params.planeY, 'negated' ).onChange( () => {
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planes[ 1 ].negate();
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params.planeY.constant = planes[ 1 ].constant;
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} );
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planeY.open();
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const planeZ = gui.addFolder( 'planeZ' );
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planeZ.add( params.planeZ, 'displayHelper' ).onChange( v => planeHelpers[ 2 ].visible = v );
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planeZ.add( params.planeZ, 'constant' ).min( - 1 ).max( 1 ).onChange( d => planes[ 2 ].constant = d );
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planeZ.add( params.planeZ, 'negated' ).onChange( () => {
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planes[ 2 ].negate();
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params.planeZ.constant = planes[ 2 ].constant;
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} );
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planeZ.open();
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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function animate() {
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const delta = clock.getDelta();
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requestAnimationFrame( animate );
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if ( params.animate ) {
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object.rotation.x += delta * 0.5;
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object.rotation.y += delta * 0.2;
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}
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for ( let i = 0; i < planeObjects.length; i ++ ) {
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const plane = planes[ i ];
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const po = planeObjects[ i ];
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plane.coplanarPoint( po.position );
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po.lookAt(
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po.position.x - plane.normal.x,
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po.position.y - plane.normal.y,
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po.position.z - plane.normal.z,
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);
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}
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stats.begin();
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renderer.render( scene, camera );
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stats.end();
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}
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</script>
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</body>
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</html>
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