Foregoing using something like diffuse reflection (blurs as it fades), and 
therefore some slower technique, you might be able to get by with just 
variable reflection.

Try the following finish for the floor:

 finish {ambient 0.4 diffuse 0.4 reflection {0, 15 falloff 7}}

This seemed okay to me as long as global_settings {assumed_gamma 1} was used 
here. Oh, and I removed your point loight source, too. The reflection 
settings might seem extreme but there's nothing stopping you from doing 
that.

Bob Hughes

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