在collada对象上剥离阴影

Question

我有一个带有两个collada物体和一个定向灯的场景.第一个collada几乎是一个平面,第二个是由多个盒子组成.

看起来当渲染场景时,一些"侧面"阴影确实被剥离,尽管在地面上投射的阴影很好地渲染.

.

当我正在寻找答案时,我发现它可能是我的collada的一个问题,所以我在场景中添加了一个基本的立方体(最重要的一个),但似乎它有同样的问题.

有没有人有提示或已经知道这个问题？

我正在使用最后三个.js版本atm(r71),在Google Chrome和Mozilla Firefox(MacOS)上测试过.我已经尝试调整定向灯的所有阴影*属性,除了与shadowCascade(我不使用)相关的属性.我还测试了调整与阴影相关的渲染器的属性.

这是我的灯光设置:

var directionalLight = new THREE.DirectionalLight( 0xffffff, 1 );
directionalLight.target.position = THREE.Vector3(0, 0, 0);
directionalLight.position.set( 250, 500, 250 );
directionalLight.castShadow = true;
directionalLight.shadowCameraNear = 100;
directionalLight.shadowCameraFar = 1000;
directionalLight.shadowMapWidth = 2048;
directionalLight.shadowMapHeight = 2048;
directionalLight.shadowBias = 0.0001;
directionalLight.shadowDarkness = 0.5;
directionalLight.shadowCameraLeft = -300;
directionalLight.shadowCameraRight = 300;
directionalLight.shadowCameraTop = 300;
directionalLight.shadowCameraBottom = -300;
directionalLight.shadowCameraVisible = true;

我的collada对象有点大,我的shadowCamera边界也是如此.

我的渲染器设置:

renderer = new THREE.WebGLRenderer( {antialias: true} );
renderer.setClearColor(0x222222);
renderer.shadowMapEnabled = true;
renderer.shadowMapSoft = true;
renderer.shadowMapType = THREE.PCFSoftShadowMap;
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );

这是场景的另一种观点 (主要显示我的灯光设置).

编辑:这是一个片段:

var container;
var camera, scene, renderer, controls;
var particleLight;

scene = new THREE.Scene();
init();
animate();

function init() {

  container = document.createElement( 'div' );
  document.body.appendChild( container );
  camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 2000 );
  camera.position.set( 300, 100, 0 );

// Controls
  controls = new THREE.OrbitControls( camera );

  
  
// Cube
  var geometry = new THREE.BoxGeometry( 100, 100, 100 );
  var material = new THREE.MeshLambertMaterial();
  var cube = new THREE.Mesh( geometry, material );
  cube.position.y = 50;
  cube.rotation.y = 0.8;
  cube.castShadow = true;
  cube.receiveShadow = true;
  scene.add( cube );

// Plane
  var planeGeometry = new THREE.PlaneBufferGeometry( 300, 300, 300 );
  var plane = new THREE.Mesh( planeGeometry, material );
  plane.position.set( 0, 0, 0 );
  plane.rotation.x = -1.6;
  plane.castShadow = true;
  plane.receiveShadow = true;
  scene.add( plane );
  
// Light

  var directionalLight = new THREE.DirectionalLight( 0xffffff, 1 );
  directionalLight.target.position = THREE.Vector3(0, 0, 0);
  directionalLight.position.set( 250, 500, 250 );
  directionalLight.castShadow = true;
  directionalLight.shadowCameraNear = 100;
  directionalLight.shadowCameraFar = 1000;
  directionalLight.shadowMapWidth = 2048;
  directionalLight.shadowMapHeight = 2048;
  directionalLight.shadowBias = 0.0001;
  directionalLight.shadowDarkness = 0.5;
  directionalLight.shadowCameraLeft = -300;
  directionalLight.shadowCameraRight = 300;
  directionalLight.shadowCameraTop = 300;
  directionalLight.shadowCameraBottom = -300;
  directionalLight.shadowCameraVisible = true;
  scene.add( directionalLight );

  scene.add( new THREE.AmbientLight( 0x555555 ) );
  renderer = new THREE.WebGLRenderer( {antialias: true} );
  renderer.setClearColor(0x222222);
  renderer.shadowMapEnabled = true;
  renderer.shadowMapSoft = true;
  renderer.shadowMapType = THREE.PCFSoftShadowMap;
  renderer.setPixelRatio( window.devicePixelRatio );
  renderer.setSize( window.innerWidth, window.innerHeight );
  container.appendChild( renderer.domElement );

  window.addEventListener( 'resize', onWindowResize, false );
}

function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize( window.innerWidth, window.innerHeight );
}


function animate() {
  requestAnimationFrame( animate );
  render();
}

var clock = new THREE.Clock();

function render() {
  var timer = Date.now() * 0.0005;
  camera.lookAt(new THREE.Vector3(0, 0, 0));
  renderer.render( scene, camera );
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r71/three.min.js"></script>
<script src="http://threejs.org/examples/js/controls/OrbitControls.js"></script>

提前致谢.

Answer 1

您正在获得自阴影，因为定向光的光线与几何体的某些面完全平行。将定向光移动到稍微不同的位置。例如，

directionalLight.position.set( 250, 500, 200 );

通常，light.shadow.bias用于解决自阴影问题，但当光线和面部平行时（如您的情况），它不会有效。

此外，设置shadow.bias为负值有助于减轻其他脸上的伪影。

directionalLight.shadow.bias = - 0.01;

不幸的是，像通常那样，这会导致另一个工件：“Peter Panning”。

这些类型的权衡很常见。你只需要找到一个可以接受的妥协方案。（也许根据相机位置设置偏差。）

三.js r.75