I was trying to get a turntable animation done for the first time.
I openend the NOMAD-symbol in the upper left-hand corner and changed the “Turntable Speed”.
I clicked outside of this NOMAD-box to get back to my viewport, and all of a sudden, the whole appearence of my viewport had changed: the background was pitch-black and the model was hardly to see (black and white).
→ see screenshot
one use for height maps that I tend to use is to make alphas for brushes.
For example sculpt a rocky surface, screen grab/render the height map, add to a sculpt brush alpha with grab/drag option then use it to proliferate a larger surface with texture.