Basic Usage
Add to your project
Download and unzip, then you can drag the unzipped folder into your project’s Assets folder.
Set up in material
Note
This will use Poiyomi, for other shaders look at their documentation or ask someone for help.
At the top of your material, under Color & Normals > Decals enable a Decal. Then drag in a fishnet texture into the Decal texture slot, and make sure to set the Color Blend Mode to Replace.

Tip
You can use animate Alpha to create a toggle.