threejs 当使用正交投影时实现鼠标点选

//初始化一个正交投影的camera对象 var w = window.innerWidth,h = window.innerHeight;         camera = new THREE.OrthographicCamera( w/-2,w/2,h/-2,h/2, -1000, 1000 );         camera.position.z = 100;      //鼠标点击事件的回

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