by Lea Rosema
Three.js provides several helpers for debugging purposes that help you with the positioning and orientation of meshes, cameras and lights.
Common Helper Classesanchor
BoxHelper– shows the bounding box of an object
AxesHelper– shows the X, Y, Z axes
GridHelper– shows a grid in the scene
CameraHelper– shows the camera
DirectionalLightHelper– visualize a DirectionalLight's effect on the scene