Javascript 正交摄影机和使用光线投射选择对象_Javascript_Three.js_Raycasting_Orthographic

Javascript 正交摄影机和使用光线投射选择对象

javascript three.js

Javascript 正交摄影机和使用光线投射选择对象,javascript,three.js,raycasting,orthographic,Javascript,Three.js,Raycasting,Orthographic,我在使用光线投射器使用正交摄影机选择对象时遇到了一些困难。不过，当我使用透视相机时，我对它没有问题。在两者之间切换时，我唯一要改变的是相机类型我可以在正交视图上选择面，但它与我在屏幕上单击的位置关系不大。当我可以在远离对象的地方单击时，它仍然会返回，就好像它击中了靠近其中心的对象一样你知道我在这里遗漏了什么吗我的大部分代码都基于此，我希望从我的代码中获得一个非常相似的结果。我引用的这个示例使用透视摄影机非常感谢您的帮助 <html> <head> <st

我在使用光线投射器使用正交摄影机选择对象时遇到了一些困难。不过，当我使用透视相机时，我对它没有问题。在两者之间切换时，我唯一要改变的是相机类型

我可以在正交视图上选择面，但它与我在屏幕上单击的位置关系不大。当我可以在远离对象的地方单击时，它仍然会返回，就好像它击中了靠近其中心的对象一样

你知道我在这里遗漏了什么吗

我的大部分代码都基于此，我希望从我的代码中获得一个非常相似的结果。我引用的这个示例使用透视摄影机

非常感谢您的帮助

<html>
<head>
  <style>
    canvas {
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      position: fixed;
      background-color: #111115;
    }
  </style>
</head>
<body id='c'>
  <script src="js/three.js"></script>

  <script>

    var obj = [];
    var mouse ={};
    var zoom = 2;

    var scene = new THREE.Scene();

    //switch between these two and see the difference:
    //var camera =  new THREE.OrthographicCamera(window.innerWidth / -zoom, window.innerWidth / zoom, window.innerHeight / zoom, window.innerHeight / -zoom, -1000, 1000);
    var camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );

    camera.position = new THREE.Vector3(100,100,100);
    camera.lookAt(new THREE.Vector3(0,0,0));

    // this material causes a mesh to use colors assigned to faces
    var material = new THREE.MeshBasicMaterial( 
    { color: 0xffffff, vertexColors: THREE.FaceColors } );

    var sphereGeometry = new THREE.SphereGeometry( 80, 32, 16 );
    for ( var i = 0; i < sphereGeometry.faces.length; i++ ) 
    {
      face = sphereGeometry.faces[ i ]; 
      face.color.setRGB( 0, 0, 0.8 * Math.random() + 0.2 );     
    }
    obj['box'] = {};
    obj['box'] = new THREE.Mesh( sphereGeometry, material );
    obj['box'].castShadow = true;
    obj['box'].receiveShadow = true;
    scene.add(obj['box']);

    var ambientLight = new THREE.AmbientLight(0xbbbbbb);
    scene.add(ambientLight);

    var directionalLight = new THREE.DirectionalLight(0xffffff, 1);
    directionalLight.position.set(-100, 40, 100);
    directionalLight.castShadow = true;
    directionalLight.shadowOnly = true;
    directionalLight.shadowDarkness = .5;
    scene.add(directionalLight); 

    var renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.shadowMapEnabled = true;
    renderer.shadowMapSoft = true;
    document.body.appendChild(renderer.domElement);

    projector = new THREE.Projector();
    document.addEventListener( 'mousedown', onDocumentMouseDown, false );
    function onDocumentMouseDown( event ) {
      // the following line would stop any other event handler from firing
      // (such as the mouse's TrackballControls)
      // event.preventDefault();

      console.log("Click.");

      // update the mouse variable
      mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
      mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

      // find intersections

      // create a Ray with origin at the mouse position
      //   and direction into the scene (camera direction)
      var vector = new THREE.Vector3( mouse.x, mouse.y, 1 );
      projector.unprojectVector( vector, camera );
      var ray = new THREE.Raycaster( camera.position, vector.sub( camera.position ).normalize() );

      // create an array containing all objects in the scene with which the ray intersects
      var intersects = ray.intersectObjects( [obj['box']] );

      // if there is one (or more) intersections
      if ( intersects.length > 0 )
      {
        console.log("Hit @ " + toString( intersects[0].point ) );
        console.log(intersects);
        // change the color of the closest face.
        intersects[ 0 ].face.color.setRGB( 0.8 * Math.random() + 0.2, 0, 0 ); 
        intersects[ 0 ].object.geometry.colorsNeedUpdate = true;
      }
    }

    function toString(v) { return "[ " + v.x + ", " + v.y + ", " + v.z + " ]"; }

    var render = function() {
      requestAnimationFrame(render);
      renderer.render(scene, camera);
    };

    console.log(camera);
    console.log(obj['box'])
    render();

    </script>
</body>

我希望这是一件我还不知道的简单事情

three.js r60

以下是使用正交摄影机或透视摄影机进行光线投射时使用的模式：

var raycaster = new THREE.Raycaster(); // create once
var mouse = new THREE.Vector2(); // create once

...

mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;

raycaster.setFromCamera( mouse, camera );

var intersects = raycaster.intersectObjects( objects, recursiveFlag );

three.js r.84

还有一个注释可能会为您省去一些麻烦。如果您有这样的相机：

var camera = new THREE.OrthographicCamera(0, window.innerWidth, -window.innerHeight, 0, -100, 100);

然后，在光线投射过程中，确保将光线原点.z移动到camera.far，以使其击中整个可见范围内的任何物体：

this.ray.origin.set(0, 0, 0);
this.camera.localToWorld(this.ray.origin);
this.ray.setFromCamera(this.mouseCoord, this.camera);
this.ray.origin.z = this.camera.far;

提示：平面附近的正交摄影机为负片。在摄像机后面。它应该是积极的。另外，前四个参数是世界坐标，而不是像素坐标，因此不要混淆。thx。令人不舒服的是，拾取代码取决于相机类型……但比在WebGL中自行创建要好得多：请添加相机配置，因为您呈现的片段依赖于它。太好了：我还添加了this.ray=this.raycaster.ray