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1. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Linkitch · Mar 2012 · Home› Unreal Engine

   If I just have a tileable texture applied to an object. But the object is elongated, so having a 1:1 lightmap would become stretched and be a waste of space. That being said I'm having some problems figuring this out. If I have a texture that's 512x128. Then I need to unwrap the object so that the UV's take up 1:1. If I…

2. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Oniram · Mar 2012 · Home› Unreal Engine

   ive recently made it a rule that wasted space on a lightmap is no big deal. also. if you're using a tileable texture on a mesh.. meaning no unique uvs.. its ok to go outside 0-1. so if your first UV channel has a texture that would "fit best" in a 4:1 uv space.. leave it as 1:1.. it'll tile on its own. then keeping your…

3. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Linkitch · Mar 2012 · Home› Unreal Engine

   How do I apply that to only affect the Lightmap? UV0 having a normal 1:1 UV1 having 2:1

4. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Oniram · Mar 2012 · Home› Unreal Engine

   why is your lightmap 2:1 anyway if your regular UVs are 1:1? just out of curiosity.

5. UV's not being 1:1, but 1:2 ?

   

   Topic by Linkitch · Mar 2012 · Home› Unreal Engine

   I'm using 3DsMax 2012 and exporting to FBX. If I have an object that I've unwrapped to use eg. 512x256, UDK seems to make it 512x512 no matter what. Is this something you can change somehow? It seems really inefficient when thinking of Lightmaps, since it doesn't really need that extra 256 pixels in the height.

6. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by haiddasalami · Mar 2012 · Home› Unreal Engine

   Agree with Oniram. I've been doing a lot of moduluar texturing and just leaving my lightmaps 1:1 and making sure there's tonnes of padding incase the lightmap mips.

7. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Vailias · Mar 2012 · Home› Unreal Engine

   Um... Normally you'll have the uv's fill 0-1 space on each axis even if the texture is rectangular. The uv's look distorted in your DCCA but the texture applies just fine as its indexed from 0-1 on each axis anyway. One axis just ends up with a higher texel density. So yeah you'll have some waste on the light map for that…

8. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Oniram · Mar 2012 · Home› Unreal Engine

   in the material editor bring up a Texture Coordinate node (U+Click) and set it to tile 2x1. plug it into your textures.. bam.

9. Re: UV's not being 1:1, but 1:2 ?

   

   Reply by Vailias · Mar 2012 · Home› Unreal Engine

   Edit: misread the question Really the lightmap may not. Need that high of res anyway. Try it as a 256^2 maybe?

10. Re: UV's not being 1:1, but 1:2 ?

    

    Reply by Linkitch · Mar 2012 · Home› Unreal Engine

    No it's obviously not worth it, I was just curious as to why it's not possible to do.