{UDK] RBA multi map- compression issue

Rageleet

Hey guys i have RGBA texture broken down into 4 Grayscale images saved into a single tga file.

Im using the texture in a material and breaking it down into the 4 grayscale images.

the problem is that when the texture is compressed by unreal the RGB values are blurring into each other and i have no idea why.

Does anyone know why this is? and how i could fix it?

JamesWild

It's DXT/S3TC - it's a texture format that uses 4x4 pixel blocks with a palette in each one. It's pretty good for standard textures, but you may encounter interference as you've seen. The green channel also has one extra bit of precision which may cause it to round to a different value to R/B.

How big's the texture and what's it for? There may be a solution.

Rageleet

Im basically trying to create animation for this futuristic screen by putting all the animation bits into separate channels to save on memory then accessing them in the material editor. The Texture is 1024, and that's a little big for what i want .

its really frustrating being able to see it working then when you save it its ruined .



iv uploaded a file but im not sure if you can see the texture file that well.

I'm basically making the waves pan and the boxes pan up. but where each texture crosses in the RGB artifacts occur



if worst comes to worst ill have to use separate images just a lot of memory.

JamesWild

Oh, right.

There are uncompressed formats available when importing, but ideally, keep their use to a minimum as they are VERY expensive on consoles where there isn't much VRAM.

I don't know how well supported the greyscale format is, and the fillrate will be more expensive using more greyscale textures. Gonna have to experiment and see what works best, preferably in a scene that loads down the GPU with quite a few of these signs.

Rageleet

thanks for the help ended up just breaking down the parts that over lapped manage to only end adding one additional small texture so its not to bad.
:thumbup: