threejs显示帮助

照相机：

shadowCameraHelper = new THREE.CameraHelper(camera);
scene.add(shadowCameraHelper)

灯光：

lightHelper = new THREE.SpotLightHelper( spotLight,0x000000 );
scene.add(lightHelper)

　　

坐标轴：

cene.add(new THREE.AxesHelper(300,300));