Adding more directions to the noise/terrain shader

[diegopau]

First of all, thank you for this shader collection. It is super useful!

I have been tinkering with the terrain shader in an attempt to make it work also for walls but I can't get it right, I have never worked with shaders before.

The shader comes with 2 directions (floor and ceiling) and it would be useful for me to have that sort of generation for walls which would be 4 extra possible directions. I would be thankful for any clue on how to make this work.