3d image rotating

Hello.

I'm looking for way to rotate normal images, but not x/y, but with Z also.
I get a source image (png, jpg, gif...) and I want to rotate it. assuming
the "depth" of the image is 1 pixel for example...

I'm looking for a way to do it without using imagemagick - only GD. I know
it might be slower, but its need to run on a server without imagemagick.

I've searched information about it, also in PEAR, but I couldn't find
anything that takes a normal image and rotate it..

Thanks, Daniel

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