[Radiance-general] mksource program

[Santiago Torres]

Hi Greg and all,
I`ve tried mksource a bit and it works wonderfully, it`s a great program
(and just what I needed)
I put a page with the first sample renders:
http://home.att.ne.jp/banana/tiago/radiance/mksource.htm
rpict was only with -ab 1, and all the rest defaults since I just wanted to
test the sources

first I tried mksource with the default settings but it seemed to produce
too few sources, and the render looked unnatural
(don`t think this could be fixed with rpict settings)
I tried changing the max angle to 0.5 (-a .5) but that was too small, and
the render took too long (at least for my laptop)
so I tried other three values (5 deg, 2 and 1, after moving to a faster
computer) and the differences are visible. The render with -a 1 took about
15 hours, so I don`t want to imagine what would happen with -ab 3 -ad 5000
etc...
I guess it`s a compromise, and maybe making the threshold higher would
reduce the number of sources and allow a smaller -a?
I will keep trying other settings and let you know how it goes.
Regards

Santiago




> -----Original Message-----
> From: radiance-general-bounces at radiance-online.org
> [mailto:radiance-general-bounces at radiance-online.org]On Behalf Of
> Gregory J.Ward
> Sent: Wednesday, April 13, 2005 3:39 AM
> To: Radiance general discussion
> Subject: [Radiance-general] mksource program
>
>
> I recently wrote a program for computing light sources to accelerate
> image-based lighting for anyone who's working on that.  You can get it
> in last night's HEAD, and the synopsis is below:
>
> NAME
>         mksource - compute distant sources for RADIANCE image-based
> lighting
>
> SYNOPSIS
>         mksource [ -d nsamps ][ -t thresh ][ -a maxang ] [ octree ]
>
> DESCRIPTION
>         Mksource produces a RADIANCE scene description of distant illum
> sources
>         corresponding to bright, concentrated  regions  in  the  given
> ambient
>         environment.   Any local geometry is ignored in the input
> octree, which
>         should be derived from a captured light probe.  The output
> sources  may
>         then  be  combined  with  this  environment to produce a more
> efficient
>         scene for rendering, faster and less prone to sampling artifacts.
>
> --------
> I'd be interested in feedback if you give this a try.
>
> -Greg
>
>
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