[Radiance-general] BSDF xml into Radiance

[Greg Ward]

Hi Lars,

At least in my experiments, the rendering times always improved with increased settings of -c for the same total number of primary rays.  Are you using the new rcontrib implementation or the older rtcontrib (based on rtrace)?  If you are using the latter, then I'm not sure it will always help to increase -c.

The latest HEAD builds only rcontrib and puts a soft link back to rtcontrib in the binary destination directory.

Cheers,
-Greg

> From: "Lars O. Grobe" <grobe at gmx.net>
> Date: July 30, 2012 11:17:40 AM PDT
> 
> Hi Greg,
> 
> thank you for the quick reply!
> 
>>> What is the actual advantage of using -c 4 instead of doubling x-
>>> and y-resolution?
>> 
>> Yes, I think so.  The main advantage of increasing -c as opposed to
>> -x and -y is efficiency -- the output picture files are smaller, so
>> you don't have as much disk i/o (which can be a bottleneck) and don't
>> have to filter the results, either.
> 
> That was what I expected, but for whatever reasons, I experienced a
> slowdown when setting -x and -y to 1/2 and doubling -c. Did you observe
> an improvement in rendering times?
> 
> Cheers, Lars.