three.js - 正交相机和pickRay？

Question

我尝试实现一个在正交相机的舞台复合体中选择和移动对象的功能。

我想得到与以下相同的示例:http://threejs.org/examples/webgl_interactive_draggablecubes.html

但不适用于透视相机。

我已经替换了:

var camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 1000 );

与:

var camera =  new THREE.OrthographicCamera(window.innerWidth / -zoom, window.innerWidth / zoom, window.innerHeight / zoom, window.innerHeight / -zoom, -1000, 1000);

并替换了这个:

var ray = new THREE.Raycaster( camera.position, vector.sub( camera.position ).normalize() );

通过这个:

var ray = projector.pickingRay( vector, camera );

但是，它似乎还不足以运行。

那么，它缺少什么？

是否可以将投影仪和射线与 OrthographicCamera 一起使用？

谢谢。

Answer 1

请在您的示例中尝试此代码:

event.preventDefault();
    if (event.button === 0) {

        var projector = new THREE.Projector();
        var vector = new THREE.Vector3((event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window.innerHeight) * 2 + 1, 0.5);
        // use picking ray since it's an orthographic camera
        var raycaster = projector.pickingRay(vector, camera);
        //ditermine whether any of the supplied objects are hit by this ray    
        var intersertsObj = raycaster.intersectObjects(_entities);
        // _entities : is array entities you put to scence
        // you can store this list before you entity to scence: 
        // _entities.push(entity);
        // scene.add(entity);
        if (intersertsObj.length > 0) {           
            var pickedObject = intersertsObj[0];               
        }       
    }
    event = null;

它在我的项目中运行良好。