Flipped UV's and normal mapping

Rob Galanakis

How do people handle mirrored or reverse UV coordinates with normal maps? I know in game engines, its done during model loading or something like that, but how would I take renders with flipped UV coordinates? I can think of a workaround (put flipped UV shells in -1 to 0 and invert the red channel in the pixel shader for any pixels not in 0 to 1 texture space) but I would think there's a simpler way to do this?

killingpeople

Ask all your nooby normal mapping questions in this thread, and we'll compile the info in a sticky to lower the level of noise on this subject and make things clear once and for all.

Eric Chadwick

Yeah, reading through it might help. Some info I've been adding here too...
http://wiki.cgsociety.org/index.php/Normal_Bump#UV_Coordinates

Sage

you can select all your mirrored geo and apply a copy of the normal mapped material with the one of the channels flipped. In max for example the normal bump material lets your flip the channels on x or y or to swap them. Try which ever setting works. It's worked for me anyway. Hope that helps



Alex

BeatKitano

yeah, kind of resurrection this old thread, but i wanted to thank Sage for this workaround, this was bugging me for quite a long time (needed to make everything unique)