陰影和光源調試

• CameraHelper
• SpotLightHelper

可以使用如上輔助對象調試

const spotLight = new THREE.SpotLight( 0xffffff );
spotLight.position.set( 10, 10, 10 );
scene.add( spotLight );

const spotLightHelper = new THREE.SpotLightHelper( spotLight );
scene.add( spotLightHelper );