creating SD atlas from HD

[tinyutopia]

I'm trying to create an SD atlas from my HD iPad resolution atlas. Is there a faster way to create this 1/2 res atlas other than taking all of the images that I used to create the HD atlas, scaling them by 50% and then creating a new atlas with the scaled images?

Ideally, I'd like to simply take the HD atlas image directly and scale it by 50% rather than taking each image one by one and rebuilding another atlas. I assume that this won't work because the UV coordinates won't transfer between atlases.

[Nicki]

Nope. Make an action in photoshop to batch it for you, that should be the easiest way.

Purely theoretically, if the texture coordinates are in float from 0-1, which they often are, then you could just scale the atlas texture down - but I don't think it is in this case.