I hadn't really paid much attention to that Esper, but it appears to be an artifact from the emap section of the lighting plug-in. The artifact occurs exactly at the midpoint of the image and is only noticeable on a diagonal line. I suspect it is due to the stretching that occurs from the midpoint (left and right outward) when the emap is actually mapped to the target object. It is only noticeable on a diagonal section. The fix is to ensure a diagonal section doesn't fall in the exact middle of the image.



@Rod - For patterns, I've just been creating an empty map image 4x the size of the original with no alpha, then filling with the selected pattern. I'm not sure if emapping is better than the traditional method of separate bumping and lighting, it's just a little different effect.

its still strange that i got the same artifact on my image - and i made that with no emap, but an ordinary bumpmap





thats the best result i have seen so far !
looks almost like car paint

Sometimes, I get some strange artifacts using bumpmaps too, especially with certain curves, like spherical. Do you remember the settings you used on that bumpmap? i wasn't able duplicate the artifact on my end.

yes i think so, i took the image from the bumpmap tutorial i wrote for Akros
http://gimp-science-labs.blogspot.de/20 ... pping.html

Depth 10, Azimuth 140 - all the other values on default
the bumpmap was a selection filled with white on a transparent layer, blurred by 5

i attached the xcf if that helps

I think it's just a bad bumpmap. I tried one with a Gauss blur of 10 and it doesn't have that artifact.

These are some excellent results Tux, must have a play soon, is it possible for you to start a dedicated tutorial thread on this as I'm getting lost with all the posts and settings.

Thanks, He4rty. I'll start a tut thread on these results.

Excellent work tux.