There are two ways to solve this. Either scale your texture up to the next power of 2, using a paint package, and then have your quad''s tu and tv values go from 0 to 1. Or, slightly more complicated, just create a texture which is of power 2 dimensions and is large enough to hold your original texture (in this case a 512 x 256), then copy your original texture onto the new texture and work out which texture coordinates map to the corners of the bit you want. E.G.
<---------512-------------><------490------->---------------------------| | || Drivers license | || texture | || | ||------------------ || || |---------------------------
In this case, your texture coordinates would be:
tu from 0 to (490 / 512)
tv from 0 to (238 / 256)
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My question though is, what if I wanted to (hypothetically) draw a rectangle with a flat face and map a *high quality* image of my drivers license to it?
the dimensions of the front face of the rectangle will obviously not be proportional to textures saved w/ dimensions to powers of 2..
The front face of the rectangle (3D Drivers License) will have say dimensions 490 x 238.
How would I properly map texture of say a high quality pic of my drivers license to such an "quad"? 
