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215 lines
5.5 KiB
HTML
215 lines
5.5 KiB
HTML
2 months ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Shadows - Fake</title>
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<style>
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html, body {
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margin: 0;
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height: 100%;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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</body>
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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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}
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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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function main() {
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const canvas = document.querySelector( '#c' );
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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const fov = 45;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 100;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.set( 0, 10, 20 );
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camera.lookAt( 0, 0, 0 );
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const scene = new THREE.Scene();
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scene.background = new THREE.Color( 'white' );
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const loader = new THREE.TextureLoader();
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{
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const planeSize = 40;
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const texture = loader.load( 'resources/images/checker.png' );
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texture.wrapS = THREE.RepeatWrapping;
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texture.wrapT = THREE.RepeatWrapping;
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texture.magFilter = THREE.NearestFilter;
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texture.colorSpace = THREE.SRGBColorSpace;
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const repeats = planeSize / 2;
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texture.repeat.set( repeats, repeats );
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const planeGeo = new THREE.PlaneGeometry( planeSize, planeSize );
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const planeMat = new THREE.MeshBasicMaterial( {
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map: texture,
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side: THREE.DoubleSide,
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} );
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planeMat.color.setRGB( 1.5, 1.5, 1.5 );
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const mesh = new THREE.Mesh( planeGeo, planeMat );
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mesh.rotation.x = Math.PI * - .5;
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scene.add( mesh );
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}
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const shadowTexture = loader.load( 'resources/images/roundshadow.png' );
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const sphereShadowBases = [];
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{
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const sphereRadius = 1;
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const sphereWidthDivisions = 32;
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const sphereHeightDivisions = 16;
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const sphereGeo = new THREE.SphereGeometry( sphereRadius, sphereWidthDivisions, sphereHeightDivisions );
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const planeSize = 1;
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const shadowGeo = new THREE.PlaneGeometry( planeSize, planeSize );
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const numSpheres = 15;
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for ( let i = 0; i < numSpheres; ++ i ) {
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// make a base for the shadow and the sphere.
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// so they move together.
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const base = new THREE.Object3D();
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scene.add( base );
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// add the shadow to the base
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// note: we make a new material for each sphere
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// so we can set that sphere's material transparency
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// separately.
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const shadowMat = new THREE.MeshBasicMaterial( {
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map: shadowTexture,
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transparent: true, // so we can see the ground
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depthWrite: false, // so we don't have to sort
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} );
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const shadowMesh = new THREE.Mesh( shadowGeo, shadowMat );
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shadowMesh.position.y = 0.001; // so we're above the ground slightly
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shadowMesh.rotation.x = Math.PI * - .5;
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const shadowSize = sphereRadius * 4;
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shadowMesh.scale.set( shadowSize, shadowSize, shadowSize );
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base.add( shadowMesh );
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// add the sphere to the base
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const u = i / numSpheres;
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const sphereMat = new THREE.MeshPhongMaterial();
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sphereMat.color.setHSL( u, 1, .75 );
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const sphereMesh = new THREE.Mesh( sphereGeo, sphereMat );
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sphereMesh.position.set( 0, sphereRadius + 2, 0 );
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base.add( sphereMesh );
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// remember all 3 plus the y position
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sphereShadowBases.push( { base, sphereMesh, shadowMesh, y: sphereMesh.position.y } );
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}
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}
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{
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const skyColor = 0xB1E1FF; // light blue
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const groundColor = 0xB97A20; // brownish orange
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const intensity = 0.75;
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const light = new THREE.HemisphereLight( skyColor, groundColor, intensity );
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scene.add( light );
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}
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{
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const color = 0xFFFFFF;
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const intensity = 2.5;
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const light = new THREE.DirectionalLight( color, intensity );
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light.position.set( 0, 10, 5 );
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light.target.position.set( - 5, 0, 0 );
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scene.add( light );
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scene.add( light.target );
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}
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if ( needResize ) {
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renderer.setSize( width, height, false );
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}
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return needResize;
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}
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function render( time ) {
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time *= 0.001; // convert to seconds
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resizeRendererToDisplaySize( renderer );
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{
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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sphereShadowBases.forEach( ( sphereShadowBase, ndx ) => {
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const { base, sphereMesh, shadowMesh, y } = sphereShadowBase;
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// u is a value that goes from 0 to 1 as we iterate the spheres
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const u = ndx / sphereShadowBases.length;
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// compute a position for there base. This will move
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// both the sphere and its shadow
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const speed = time * .2;
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const angle = speed + u * Math.PI * 2 * ( ndx % 1 ? 1 : - 1 );
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const radius = Math.sin( speed - ndx ) * 10;
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base.position.set( Math.cos( angle ) * radius, 0, Math.sin( angle ) * radius );
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// yOff is a value that goes from 0 to 1
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const yOff = Math.abs( Math.sin( time * 2 + ndx ) );
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// move the sphere up and down
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sphereMesh.position.y = y + THREE.MathUtils.lerp( - 2, 2, yOff );
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// fade the shadow as the sphere goes up
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shadowMesh.material.opacity = THREE.MathUtils.lerp( 1, .25, yOff );
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} );
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renderer.render( scene, camera );
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requestAnimationFrame( render );
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}
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requestAnimationFrame( render );
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}
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main();
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</script>
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</html>
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