three.js对象选中发光高亮代码示例 - 踏得网

three.js bloom selective example，可以在线调节bloom的参数：发光强度、半径等。这是渲染管道中bloompass后处理的一个示例。

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JavaScript

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CSS

HTML

<script type="x-shader/x-vertex" id="vertexshader">
  varying vec2 vUv;
  void main() {
    vUv = uv;
    gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
  }
</script>

<script type="x-shader/x-fragment" id="fragmentshader">
  uniform sampler2D baseTexture;
  uniform sampler2D bloomTexture;
  varying vec2 vUv;
  vec4 getTexture( sampler2D texelToLinearTexture ) {
    return mapTexelToLinear( texture2D( texelToLinearTexture , vUv ) );
  }
  void main() {
    gl_FragColor = ( getTexture( baseTexture ) + vec4( 1.0 ) * getTexture( bloomTexture ) );
  }
</script>

<script type="module">
  import * as THREE from '//techbrood.com/threejs/build/three.module.js';
  import { GUI } from '//techbrood.com/threejs/examples/jsm/libs/dat.gui.module.js';
  import { OrbitControls } from '//techbrood.com/threejs/examples/jsm/controls/OrbitControls.js';
  import { EffectComposer } from '//techbrood.com/threejs/examples/jsm/postprocessing/EffectComposer.js';
  import { RenderPass } from '//techbrood.com/threejs/examples/jsm/postprocessing/RenderPass.js';
  import { ShaderPass } from '//techbrood.com/threejs/examples/jsm/postprocessing/ShaderPass.js';
  import { UnrealBloomPass } from '//techbrood.com/threejs/examples/jsm/postprocessing/UnrealBloomPass.js';
  var scene, camera, controls;
  var renderer;
  var ENTIRE_SCENE = 0, BLOOM_SCENE = 1;
  var bloomLayer = new THREE.Layers();
  bloomLayer.set( BLOOM_SCENE );
  var params = {
    exposure: 1,
    bloomStrength: 5,
    bloomThreshold: 0,
    bloomRadius: 0,
    scene: "Scene with Glow"
  };
  var darkMaterial = new THREE.MeshBasicMaterial( { color: "black" } );
  var materials = {};
  renderer = new THREE.WebGLRenderer( { antialias: true } );
  renderer.setPixelRatio( window.devicePixelRatio );
  renderer.setSize( window.innerWidth, window.innerHeight );
  renderer.toneMapping = THREE.ReinhardToneMapping;
  document.body.appendChild( renderer.domElement );
  scene = new THREE.Scene();
  camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 200 );
  camera.position.set( 0, 0, 20 );
  camera.lookAt( 0, 0, 0 );
  controls = new OrbitControls( camera, renderer.domElement );
  controls.maxPolarAngle = Math.PI * 0.5;
  controls.minDistance = 1;
  controls.maxDistance = 100;
  controls.addEventListener( 'change', render );
  scene.add( new THREE.AmbientLight( 0x404040 ) );
  var renderScene = new RenderPass( scene, camera );
  var bloomPass = new UnrealBloomPass( new THREE.Vector2( window.innerWidth, window.innerHeight ), 1.5, 0.4, 0.85 );
  bloomPass.threshold = params.bloomThreshold;
  bloomPass.strength = params.bloomStrength;
  bloomPass.radius = params.bloomRadius;
  var bloomComposer = new EffectComposer( renderer );
  bloomComposer.renderToScreen = false;
  bloomComposer.addPass( renderScene );
  bloomComposer.addPass( bloomPass );
  var finalPass = new ShaderPass(
    new THREE.ShaderMaterial( {
      uniforms: {
        baseTexture: { value: null },
        bloomTexture: { value: bloomComposer.renderTarget2.texture }
      },
      vertexShader: document.getElementById( 'vertexshader' ).textContent,
      fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
      defines: {}
    } ), "baseTexture"
  );
  finalPass.needsSwap = true;
  var finalComposer = new EffectComposer( renderer );
  finalComposer.addPass( renderScene );
  finalComposer.addPass( finalPass );
  var raycaster = new THREE.Raycaster();
  var mouse = new THREE.Vector2();
  window.addEventListener( 'click', onDocumentMouseClick, false );
  var gui = new GUI();
  gui.add( params, 'scene', [ 'Scene with Glow', 'Glow only', 'Scene only' ] ).onChange( function ( value ) {
    switch ( value )  {
      case 'Scene with Glow':
        bloomComposer.renderToScreen = false;
        break;
      case 'Glow only':
        bloomComposer.renderToScreen = true;
        break;
      case 'Scene only':
        // nothing to do
        break;
    }
    render();
  } );
  var folder = gui.addFolder( 'Bloom Parameters' );
  folder.add( params, 'exposure', 0.1, 2 ).onChange( function ( value ) {
    renderer.toneMappingExposure = Math.pow( value, 4.0 );
    render();
  } );
  folder.add( params, 'bloomThreshold', 0.0, 1.0 ).onChange( function ( value ) {
    bloomPass.threshold = Number( value );
    render();
  } );
  folder.add( params, 'bloomStrength', 0.0, 10.0 ).onChange( function ( value ) {
    bloomPass.strength = Number( value );
    render();
  } );
  folder.add( params, 'bloomRadius', 0.0, 1.0 ).step( 0.01 ).onChange( function ( value ) {
    bloomPass.radius = Number( value );
    render();
  } );
  setupScene();
  function onDocumentMouseClick( event ) {
    event.preventDefault();
    mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
    mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
    raycaster.setFromCamera( mouse, camera );
    var intersects = raycaster.intersectObjects( scene.children );
    if ( intersects.length > 0 ) {
      var object = intersects[ 0 ].object;
      object.layers.toggle( BLOOM_SCENE );
      render();
    }
  }
  window.onresize = function () {
    var width = window.innerWidth;
    var height = window.innerHeight;
    camera.aspect = width / height;
    camera.updateProjectionMatrix();
    renderer.setSize( width, height );
    bloomComposer.setSize( width, height );
    finalComposer.setSize( width, height );
    render();
  };
  function setupScene() {
    scene.traverse( disposeMaterial );
    scene.children.length = 0;
    var geometry = new THREE.IcosahedronBufferGeometry( 1, 4 );
    for ( var i = 0; i < 50; i ++ ) {
      var color = new THREE.Color();
      color.setHSL( Math.random(), 0.7, Math.random() * 0.2 + 0.05 );
      var material = new THREE.MeshBasicMaterial( { color: color } );
      var sphere = new THREE.Mesh( geometry, material );
      sphere.position.x = Math.random() * 10 - 5;
      sphere.position.y = Math.random() * 10 - 5;
      sphere.position.z = Math.random() * 10 - 5;
      sphere.position.normalize().multiplyScalar( Math.random() * 4.0 + 2.0 );
      sphere.scale.setScalar( Math.random() * Math.random() + 0.5 );
      scene.add( sphere );
      if ( Math.random() < 0.25 ) sphere.layers.enable( BLOOM_SCENE );
    }
    render();
  }
  function disposeMaterial( obj ) {
    if ( obj.material ) {
      obj.material.dispose();
    }
  }
  function render() {
    switch ( params.scene ) {
      case 'Scene only':
        renderer.render( scene, camera );
        break;
      case 'Glow only':
        renderBloom( false );
        break;
      case 'Scene with Glow':
      default:
        // render scene with bloom
        renderBloom( true );
        // render the entire scene, then render bloom scene on top
        finalComposer.render();
        break;
    }
  }
  function renderBloom( mask ) {
    if ( mask === true ) {
      scene.traverse( darkenNonBloomed );
      bloomComposer.render();
      scene.traverse( restoreMaterial );
    } else {
      camera.layers.set( BLOOM_SCENE );
      bloomComposer.render();
      camera.layers.set( ENTIRE_SCENE );
    }
  }
  function darkenNonBloomed( obj ) {
    if ( obj.isMesh && bloomLayer.test( obj.layers ) === false ) {
      materials[ obj.uuid ] = obj.material;
      obj.material = darkMaterial;
    }
  }
  function restoreMaterial( obj ) {
    if ( materials[ obj.uuid ] ) {
      obj.material = materials[ obj.uuid ];
      delete materials[ obj.uuid ];
    }
  }
</script>