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

[Daniel Reetz]

This reminds me of one of my favorite hardware fixes. My laptop DAC
makes a hideous buzzing sound when plugged into PA amps at electronic
music venues. Of course, this is due to a ground-loop, but isolators
don't totally eliminate the buzz.

The solution? Cut the ground plug off my AC adapter.

(Sorry for running off-topic... and thanks for the hint, Lars)
DR

On Wed, Apr 16, 2008 at 4:17 PM, Mark Stock <mstock at umich.edu> wrote:
> I am ashamed to admit that I just comment out line 516 in raytrace.c to
> avoid that error.
>
>   //error(CONSISTENCY, "zero ray direction in localhit");
>
>  But then, nobody questions the numerical accuracy of my lighting, so I feel
> somewhat free to experiment.
>
>  Mark
>
>
>
>  On Thu, 17 Apr 2008, Lars O. Grobe wrote:
>
>
> > 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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