> The sun is 100 million units away and the beams are still not appearing 
> to be parallel, any thoughts?
> 
> light_source{<-40, 55, 100>*1000000 color rgb<1,1,1>*10 parallel 
> point_at <0,0,0>}
> 
> camera{ angle 50 location <-24,-15,-50> direction 1.5*z right 
> x*image_width/image_height look_at <5, -10, 15>}
> 

Your light don't need to be THAT far. You only need to make it just 
distant enough that it is farther than the farthest other object in your 
scene.

The parallel attribute ensure that all rays coming from it are 
effectively parallel.

What you are seeing is the effect of perspective that make the parallel 
rays of light appear to diverge.
As Subclick mentioned, using an orthographic camera will show that those 
rays are indeed parallel.
Also, if you place your camera very close to any of the windows and look 
back, toward the current camera location, then, the rays will appear to 
converge.

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