Do textures for mobile games need uv padding?

PredatorGSR

If you are texturing for mobile games (128 texture), do you need to leave space along the texture borders in order to avoid texture bleed? Or can you maximize your space and use every pixel?

Computron

texture padding is needed if you use mip-maps. if your trying to do pixel art you want to avoid any texture filtering.

PolyHertz

You can use every pixel, even if you're using mip maps, so long as your UVs have no diagonal lines.

Bruno Afonseca

What happens to me sometimes is that even if things look perfect in the uv map, there's a small degree of inaccuracy and it bleeds a little bit even if not filtered. If they're being filtered(probably are unless you're working with nds), they'll blend a bit.

What I usually do is work without worrying too much, if something looks weird I can go back and fix the uv. Also, what the guys said above is true

Ged

I would usually leave a tiny bit of padding and then check the model in engine before passing over to the programmer.

Scruples

Unity has a texture import option to prevent filtering between tiles. So I imagine any engine designed for phones would include something similar.

Eric Chadwick

PolyHertz wrote: »

You can use every pixel, even if you're using mip maps, so long as your UVs have no diagonal lines.

This doesn't make any sense.

Diagonal or not, if you're using mips then the model will be textured with a blurrier version of itself when you see it at a distance, which is what causes the bleeding problems.

If your game is using 'point sampling' also called 'nearest neighbor' then you probably still want at least a pixel or so of padding (or slightly-shrunk UVs). Depends on how bad the hardware is at rendering textures in perspective.

It's always the best bet is to do some testing before you spend a lot of time making assets.

AlecMoody

I think the OP means padding along the 0-1 UVs boundaries. If your engine allows you to disable texture tiling then you don't need to worry about it. If not, you need to pad like any other shell.

Eric Chadwick

If that's the case, here's something to help communicate with your programmer. This is for Direct3D, but OpenGL has similar methods.
http://msdn.microsoft.com/en-us/library/windows/desktop/bb204825%28v=vs.85%29.aspx

Eric Chadwick

Haha best bot ever!

AlecMoody

These spam bots have gotten good enough that it can be hard to differentiate them from very stupid people.

Computron

Eric Chadwick wrote: »

Haha best bot ever!

Aww, I missed it. We should have a "best of spam" thread to collect these posts.

cptSwing

Wow, another intelli-bot?