I have a old brick wall which has been painted, so I edited the material to make the joint and the base almost the same colour.
Now I need to adjust the settings so that the bricks are a bit rough on the surface instead of smooth. I know I can add "rubble", but don't know what settings to use (for x,y,z, and height) to make it suitable for brick. I have tried a few settings, but to see the results requires going out of the dialogue boxes and rendering.
Can anyone advise me what numbers or range of numbers should I be using? Or, so that I can figure it out myself next time, what kind of units are these settings using and how do I determine which ones are likely to be close to what I want?