需求：鼠标选中模型，然后点击定位按钮，将相机平移到模型跟前，相机视线不变
var box = new THREE.Box3();//包围盒box.expandByObject(model);//model是模型var center = new THREE.Vector3();box.getCenter(center);//获取中心点var distance = Math.max(box.max.x - box.min.x, Math.max(box.max.y - box.min.y, box.max.z - box.min.z));//计算模型尺寸var direction = new THREE.Vector3();camera.getWorldDirection(direction);//相机视线direction.negate();center.add(direction.multiplyScalar(distance));//中心点加上尺寸//相机定位,这一步可以换成tweenjs动画camera.position.set(center.x,center.y,center.z)
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