Hi Epic Forums!
I'm currently trying to work through an issue in the newest version of UDK. You'll find 2 pics below. I've taken a very ugly and pronounced texture and thrown it on a wall. From angle A, you'll see that it's displaying the normals correctly. However, when I rotate my camera around to the second angle the spec and diffuse disappear.
After a couple of days trying everything I know how to do, it's still doing this. I've even started a new scene, rebuilt the material and put it on a bsp floor with one point light in the scene. I've double checked the normal maps, even inverted the green channel in case it was some weird issue with the bake, that did not help.
I'm running windows 7x64bit with an ATI Radeon 4890. A fellow artist has been troubleshooting this with me in the newest version of UDK. He runs a different machine using a fairly new Nvidia card and gets the exact same issue on his end.
Any insights into this? The issue occurs on static mesh and BSP and seems to only happen after building the entire scene, but of course I can't tell if that's where the issue is occurring or not.