OldUnreal (Engine)

Hiya!
It's been awhile since I've played/mapped for Unreal or visited these forums. This morning, I decided to start mapping again.

Anyway...

So I'm having a bit of trouble with a pre-rendered skybox, and need help.





LOOK AT THOSE SEAMS
they're 10x worse in-game


I have the skybox unlit and with "bright corners" enabled.
It distracts from my chunky low-res skybox!!!

Pre-rendered skyboxes always do this in UT99.
The easiest way to correct it is to export your skybox textures and fake clamping.
Say your texture is 256*256, you export it and put it at the center of a 512*512 texture. Then select a 256*1 line of pixels at the very top of your texture and duplicate this line above the texture up to the edge of the 512*512 drawing zone. Repeat this for the 4 sides of the 6 textures of your render.



Then use these textures for your skybox. Keep the same scale and the same size for your surfaces, just center the "normal" part of your textures on the faces and the edges will blend smoothly into each other.

This problem is caused by the filtering of textures in D3D and OpenGL It blends the outermost lines of pixels of a texture together, creating the seams. UT2004 includes a Clamp mode for texture which does exactly what I described : it stretches the edges of textures. Since adjacent faces of a skybox have similar edges, they then blend nicely together. With normal filtering, each edge has a seam where it blends with the other side of itself.