I'm trying to create a stainless steel metal with dust on it. There' something I'm not understanding. I'm using a sun lamp in my scene and the effect is pretty weak:
Hoewever, if, under viewport shading, I uncheck "Scene Lights" and "Scene World", I get this - which is much closer to what I'm going for (although still not great):
The problem is that I want to use the sun lamp and not an HDRI. Basically, I'm looking for a good way to add dirt to a vehicle in a scene lit with a sun lamp.
So one question is, why does the second image look so much better? How do I get the first image to look more like the second?
More importantly though, how can I get some realistic dirt and dust on a metal vehicle?
Thanks for any help!