[Radiance-general] compile options, fast-math on gcc

[Lars O. Grobe]

Hi,

as (according to Mark's benchmarks) more and more people start to use 
the fast-math switch when compiling using gcc, I want to share my 
experience that this option, while improving performance, may lead to 
the mysterious "zero ray direction in localhit" errors. I have 
experienced those a lot when using this kind of "optimization", which 
led me to many many restarts of interrupted renderings, and solved the 
problem using a new compile with more standard-friendly parameters.

Just a hint... CU Lars.
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