>  I have been thinking about this, but there's one problem I can't think
> a solution for:
>
>  For approximately half of the rays which hit the surface only reflection
> is calculated (and for the rest of the rays only refraction). So basically
> for those rays the surface is only reflective, but not refractive. Or in
> other words, for those rays it's an *opaque* surface.
>
>  The problem is: For these rays, which see the object as opaque, what
> surface color should they use? They cannot simply return the color of
> the reflected ray because it may not be 100% reflection.

It does simply return the reflected colour, because the engine doesn't 
actually display the reflected ray colour, does it?  It averages all the 
rays together, including the refracted ones.

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