javascript
/
three.js
огледало от https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - contact shadows</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<link type="text/css" rel="stylesheet" href="main.css">
		<style>
			body {
				background-color: #fff;
				color: #000;
			}
			a {
				color: #08f;
			}
		</style>
	</head>
	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - contact shadows
		</div>
		<script type="module">

			import * as THREE from '../build/three.module.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';
			import { HorizontalBlurShader } from './jsm/shaders/HorizontalBlurShader.js';
			import { VerticalBlurShader } from './jsm/shaders/VerticalBlurShader.js';

			var camera, scene, renderer, stats, gui;

			var meshes = [];

			const PLANE_WIDTH = 2.5;
			const PLANE_HEIGHT = 2.5;
			const CAMERA_HEIGHT = 0.3;

			var state = {
				blur: 3.5,
				darkness: 1,
				opacity: 1,
				showWireframe: false,
			};

			var shadowGroup, renderTarget, renderTargetBlur, shadowCamera, cameraHelper, depthMaterial, horizontalBlurMaterial, verticalBlurMaterial;

			var planeGeometry, planeMaterial, plane, blurPlane;

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( 0.5, 1, 2 );

				scene = new THREE.Scene();

				stats = new Stats();
				document.body.appendChild( stats.dom );

				window.addEventListener( 'resize', onWindowResize );

				// add the example meshes

				var geometries = [
					new THREE.BoxBufferGeometry( 0.4, 0.4, 0.4 ),
					new THREE.IcosahedronBufferGeometry( 0.3 ),
					new THREE.TorusKnotBufferGeometry( 0.4, 0.05, 256, 24, 1, 3 )
				];

				var material = new THREE.MeshNormalMaterial();

				for ( var i = 0, l = geometries.length; i < l; i ++ ) {

					var angle = ( i / l ) * Math.PI * 2;

					var geometry = geometries[ i ];
					var mesh = new THREE.Mesh( geometry, material );
					mesh.position.y = 0.1;
					mesh.position.x = Math.cos( angle ) / 2.0;
					mesh.position.z = Math.sin( angle ) / 2.0;
					scene.add( mesh );
					meshes.push( mesh );

				}


				// the container, if you need to move the plane just move this
				shadowGroup = new THREE.Group();
				shadowGroup.position.y = - 0.3;
				scene.add( shadowGroup );

				// the render target that will show the shadows in the plane texture
				renderTarget = new THREE.WebGLRenderTarget( 512, 512 );
				renderTarget.texture.generateMipmaps = false;

				// the render target that we will use to blur the first render target
				renderTargetBlur = new THREE.WebGLRenderTarget( 512, 512 );
				renderTargetBlur.texture.generateMipmaps = false;


				// make a plane and make it face up
				planeGeometry = new THREE.PlaneGeometry( PLANE_WIDTH, PLANE_HEIGHT ).rotateX( Math.PI / 2 );
				planeMaterial = new THREE.MeshBasicMaterial( {
					map: renderTarget.texture,
					opacity: state.opacity,
					transparent: true,
				} );
				plane = new THREE.Mesh( planeGeometry, planeMaterial );
				shadowGroup.add( plane );

				// the y from the texture is flipped!
				plane.scale.y = - 1;

				// the plane onto which to blur the texture
				blurPlane = new THREE.Mesh( planeGeometry );
				blurPlane.visible = false;
				shadowGroup.add( blurPlane );

				// the camera to render the depth material from
				shadowCamera = new THREE.OrthographicCamera( - PLANE_WIDTH / 2, PLANE_WIDTH / 2, PLANE_HEIGHT / 2, - PLANE_HEIGHT / 2, 0, CAMERA_HEIGHT );
				shadowCamera.rotation.x = Math.PI / 2; // get the camera to look up
				shadowGroup.add( shadowCamera );

				cameraHelper = new THREE.CameraHelper( shadowCamera );

				// like MeshDepthMaterial, but goes from black to transparent
				depthMaterial = new THREE.ShaderMaterial( {
					uniforms: {
						darkness: { value: state.darkness },
					},
					vertexShader: THREE.ShaderChunk[ 'depth_vert' ],
					fragmentShader: `
						#define DEPTH_PACKING 3200
						uniform float darkness;
						${THREE.ShaderChunk[ 'depth_frag' ].replace(
					'gl_FragColor = vec4( vec3( 1.0 - fragCoordZ ), opacity );',
					'gl_FragColor = vec4( vec3( 0.0 ), ( 1.0 - fragCoordZ ) * darkness );'
				)}
					`,
				} );
				depthMaterial.depthTest = false;
				depthMaterial.depthWrite = false;

				horizontalBlurMaterial = new THREE.ShaderMaterial( HorizontalBlurShader );
				horizontalBlurMaterial.depthTest = false;

				verticalBlurMaterial = new THREE.ShaderMaterial( VerticalBlurShader );
				verticalBlurMaterial.depthTest = false;

				//

				gui = new GUI();


				gui.add( state, 'blur', 0, 15, 0.1 );
				gui.add( state, 'darkness', 1, 5, 0.1 ).onChange( function () {

					depthMaterial.uniforms.darkness.value = state.darkness;

				} );
				gui.add( state, 'opacity', 0, 1, 0.01 ).onChange( function () {

					planeMaterial.opacity = state.opacity;

				} );
				gui.add( state, 'showWireframe', true ).onChange( function () {

					if ( state.showWireframe ) {

						scene.add( cameraHelper );

					} else {

						scene.remove( cameraHelper );

					}

				} );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.outputEncoding = THREE.sRGBEncoding;
				document.body.appendChild( renderer.domElement );

				//

				new OrbitControls( camera, renderer.domElement );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function blurShadow( amount ) {

				blurPlane.visible = true;

				// blur horizontally and draw in the renderTargetBlur
				blurPlane.material = horizontalBlurMaterial;
				blurPlane.material.uniforms.tDiffuse.value = renderTarget.texture;
				horizontalBlurMaterial.uniforms.h.value = amount * 1 / 256;

				renderer.setRenderTarget( renderTargetBlur );
				renderer.render( blurPlane, shadowCamera );

				// blur vertically and draw in the main renderTarget
				blurPlane.material = verticalBlurMaterial;
				blurPlane.material.uniforms.tDiffuse.value = renderTargetBlur.texture;
				verticalBlurMaterial.uniforms.v.value = amount * 1 / 256;

				renderer.setRenderTarget( renderTarget );
				renderer.render( blurPlane, shadowCamera );

				blurPlane.visible = false;

			}

			function animate( time ) {

				requestAnimationFrame( animate );

				//

				meshes.forEach( mesh => {

					mesh.rotation.x += 0.01;
					mesh.rotation.y += 0.02;

				} );

				//

				// remove the background and force the depthMaterial to everything
				var initialBackground = scene.background;
				scene.background = null;

				cameraHelper.visible = false;
				scene.overrideMaterial = depthMaterial;

				// render to the render target to get the depths
				renderer.setRenderTarget( renderTarget );
				renderer.render( scene, shadowCamera );

				// and reset the override material
				scene.overrideMaterial = null;
				cameraHelper.visible = true;

				blurShadow( state.blur );

				// a second pass to reduce the artifacts
				// (0.4 is the minimum blur amout so that the artifacts are gone)
				blurShadow( state.blur * 0.4 );

				// reset and render the normal scene
				renderer.setRenderTarget( null );
				scene.background = initialBackground;

				renderer.render( scene, camera );

			}

		</script>
	</body>
</html>