Flipped UV's and normal mapping

Rob Galanakis · Jul 2007

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 · Jul 2007

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 · Jul 2007

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 · Jul 2007

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 · Aug 2007

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)

Flipped UV's and normal mapping

Replies