normal map issues from Maya to UDK

chronologicalist

The image on the left is what my normals should look like; the image on the right is what my object looks like after building the lighting in UDK. I'm not sure why there's such a drastic difference in the appearance of the normal map, but if anyone can provide insight I'd be grateful!

warby

well for one there seams to be massive amounts of "ambient lighting in the udk scene while in maya everything that isnt facing the camera is BLACK meaning there is no ambient light at all.

chronologicalist

I sorta figured it out. Raising the intensity of the normal map helped a little, but I think it'll just take a little bit of experimenting.

JamesWild

Put a point light in the middle of the wall about 1ft away. I think the scene lighting is very flat from that angle (the sun's on the other side of the wall so it's mostly the skylight) and the point light should make the normal map pop out a bit more so you can make sure it's working (before getting rid of the light again)

gsokol

Maya and UDK don't share the same tangent basis. Did you flip the green channel?

Also, in the texture import settings for UDK, did you use TC_NormalMap or TC_NormalMapUncompressed? (not sure if thats the exact name, going from memory).

Try those things.

Prtofdacrowd

gsokol wrote: »

Maya and UDK don't share the same tangent basis. Did you flip the green channel?

Also, in the texture import settings for UDK, did you use TC_NormalMap or TC_NormalMapUncompressed? (not sure if thats the exact name, going from memory).

Second-ed. Think NDo has an option if you are a bit puzzled by flipping channels.

tom.cherry

Reimport the normal map. scroll down to the "explicit normals" checkbox and [x]

tom.cherry

Oh yea.. and try inverting (Ctrl + I) your "Green" channel in photoshop before importing your TC_NormalMap to UDK