This is a very simple shader made for Unity. It can be used to hide objects in a world unless a pointlight or a spotlight shines on it directly. It can also be set to only show if a certain light color is shown on the object. This was created using Amplify Shader Editor so you can open it using that tool and modify and customize it to your needs if you feel the need. This is a free to use shader in any project you wish. Being credited in some way would be appreciated.