I understand the principle of the thing, but being a novice I just can’t get the pieces together.
I’m modeling a LEGO brick, and want to add the raised logo on the tops of the studs. I thought a height map would do the trick.
I found the logo in a PNG file. I added a seam around the top (round) face of the stud and UV Unwrapped (just that face), and lined things up in the UV editor.
Now what? I’ve tried feeding a Bump Map node to the Normal input of the Principled shader, and various ways of feeding information to the Bump Map node. Nothing works.
Meanwhile, I tried using the Texture Paint mode, but it shows its own UV mapping unrelated to what I unwrapped, and does not seem to connect with the images I have available rather than painting something directly.
Please note that I’m using Version 2.8 Daily Build. Old tutorials will not help; I already looked, and the UI and nodes just don’t line up, or uses the Texture Paint. (Specifically, the video in this answer is not useful for me.)
In this version, there is a “UV Map” node, not any “Map UV” node. This one has a UV output but no inputs, and a field that can be left blank or choose “UVMap”.