Hey folks,
I currently have a project in Unity 6 that’s using the URP.
I must admit, when it comes to shaders, I feel completely lost and have tried many things, which I didn’t fully understand. So I hope someone here is kind enough to help me out! 
The scenario is the following:
I have some walls that are rendered normally on the main camera. When some condition is met, the program switches to a separate camera, on which only the outlines of the walls should be visible, the wall itself should be fully transparent. similar to this.
I have tried following several tutorials, and this one seems to be a good starting point. However, it isn’t using the URP, and I have no clue how I could port it. So that it only displays on a single camera.
I realize that this isn’t much to go off of, but I hope that you can at least point me to some materials, so that I can read into the topic.
thank in advance!