Do any of you have an idea what the bump amplitude is an amplitude of? In Poser, bump is applied as a percentage of the default measuring unit; but I've never been able to find a definition for the bump amplitude in Carrara. I don't think Poser and Carrara use the same definition, because when I import Poser scenes to Carrara, I have to adjust bump amplitudes. I'm tired of guessing. And, while I'm at the subject: change a bump-map's brightness and the bump amplitude changes, too - is there any substantive difference between changing the brightness and changing the amplitude, or are they really the same? Thanks -

Hello CM, There is some overlap in function. Poser and Carrara do not behave in similar fashion regarding bump as you've discovered. I've found that an amplitude of +3-8 works well depending on the lighting in the scene - this is without adjusting the brightness of the imported bump map. Not all Poser bump maps are created equal. Some make a much better use of grayscale than others which have more contrast. This is where you may choose to adjust the map brightness on a Poser shader tree for certain body parts for the maps with more contrast. You can set an overall bump amplitude but then adjust individual map strength on lips for example. Carrara is simply giving a little more flexibility than you may be used to. So, with that comes more possiblities and potentially more confusion. My biggest advices would be to save the Poser shader to the Carrara Shader Browser after you finally adjust until it's "right". Then just drop it onto the same poser character the next time you bring one in and save a little time. Mark

That makes sense. There are times, though, when I'd like to be able to set the bump at half-an-inch maximum, rather than guessing at what half-an-inch looks like in relation to a particular map's histogram...