在渲染器中捕获特定网格上的点击事件

Question

我设置了一个包含两个网格（立方体）的画布渲染器。我需要做的是 catch the click event on each cube 为它调用方便的方法。

到目前为止，我可以在所有渲染器上捕获点击事件，这意味着当我点击 cube1 和 cube2 时，点击属于相同的，因为它绑定到 renderer :)

我的问题是，如何在每个立方体上绑定点击事件？

我的相关代码如下：

            //dom
    var containerPopUp=document.getElementById('popup');
    //renderer
    var rendererPopUp = new THREE.CanvasRenderer();
    rendererPopUp.setSize(420,200);

    containerPopUp.appendChild(rendererPopUp.domElement);
    //Scene
    var scenePopUp = new THREE.Scene();
    //Camera
    var cameraPopUp = new THREE.PerspectiveCamera(50,60/60,1,1000);

    cameraPopUp.position.z = 220;
    cameraPopUp.position.y =  20;
    //
    scenePopUp.add(cameraPopUp);

    //Add texture for the cube
    //Use image as texture
    var img2D = new THREE.MeshBasicMaterial({ //CHANGED to MeshBasicMaterial
    map:THREE.ImageUtils.loadTexture('img/2d.png') 
    });
    img2D.map.needsUpdate = true; //ADDED
    //Add Cube
    var cubeFor2D = new THREE.Mesh(new THREE.CubeGeometry(40,80,40),img2D);
    cubeFor2D.position.x =- 60;
    cubeFor2D.position.y = 20;

    scenePopUp.add(cubeFor2D);
    //
    var img3D = new THREE.MeshBasicMaterial({ //CHANGED to MeshBasicMaterial
    map:THREE.ImageUtils.loadTexture('img/3d.png') 
    });
    img3D.map.needsUpdate = true;
    var cubeFor3D = new THREE.Mesh(new THREE.CubeGeometry(40,80,40),img3D);
    cubeFor3D.position.x = 60;
    cubeFor3D.position.y=20;

    scenePopUp.add(cubeFor3D);
    //
    rendererPopUp.render(scenePopUp,cameraPopUp);
    //
    animate();

    rendererPopUp.domElement.addEventListener('click',testCall,false);//Here the click event is bound on the whole renderer, means what ever object in the renderer is clicked, the testCall method is called.

如您所见，cubeFor2D 和 cubeFor3D 包含在渲染器中。我需要在每个网格上绑定点击事件。我用threex.domevent.js 试过这个：

var meshes  = {};
        meshes['mesh1'] = cubeFor2D;
        meshes['mesh1'].on('mouseover', function(event){

              //response to click...
              console.log('you have clicked on cube 2D');

        });

但它不起作用，在控制台中，我收到了这个错误：

TypeError: meshes.mesh1.on is not a function

当然，我包含了 API 源代码文件：

    <script src="threex.domevent.js"></script>

Answer 1

您可以像这样生成回调。首先为每个对象定义你的回调函数：

mesh.callback = function() { console.log( this.name ); }

然后按照标准拣货模式：

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

function onDocumentMouseDown( event ) {

    event.preventDefault();

    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 ); 

    if ( intersects.length > 0 ) {

        intersects[0].object.callback();

    }

}

编辑：更新到 three.js r.70

Answer 2

1. 创建点击处理程序

   window.addEventListener('click', onDocumentMouseDown, false);
   

2. 定义onDocumentMouseDown函数，注意上面答案中raycaster的区别是点击对象的索引位置！

   var raycaster = new THREE.Raycaster();
   var mouse = new THREE.Vector2();
   function onDocumentMouseDown( event ) {
   event.preventDefault();
   mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
   mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
   raycaster.setFromCamera( mouse, camera );
   console.log(scene.children);
   var intersects = raycaster.intersectObjects( scene.children );
   console.log(intersects[1]);
   if ( intersects.length > 0 ) {
       intersects[1].object.callback();
   }}
   

3. 定义网格对象

   var mesh_menu_title = new THREE.Mesh(geometry_menu, materials_menu);
   mesh_menu_title.name = 'select_lang';
   mesh_menu_title.callback = function() { select_language();}
   scene.add(mesh_menu_title);
   

4. 定义回调函数

   function select_language(){
   var selectedObject = scene.getObjectByName("select_lang"); 
   scene.remove( selectedObject );
   var selectedObject = scene.getObjectByName("start");
   scene.remove( selectedObject );
   var selectedObject = scene.getObjectByName("menu");
   scene.remove( selectedObject );
   }
   

所以上面的代码将处理在我的画布中点击的特定对象，然后回调一个函数，“mesh.callback”，它会从画布中删除一些场景子对象。

如果使用 intersects[0].object.callback(); 则不起作用因为在索引 0 处存储的对象是顶点。