[Radiance-general] mksource program

[Fitzsimmons, Rob]

Okay,
II'll be the guy sitting in the corner with the cone hat

What should the octree consist of exactly?  

I tried a rnl box - projected with angmap.cal
Made an octree and used it with mkillum.
But it produced no output.
probably because geometry is ignored...

I don't  get how it can derive anything from a probe without geometry -  the
probe image has to be projected onto something - right?

I can't make an octree directly of a probe pic - can I?

Rob "another question" Fitz


-----Original Message-----
From: Santiago Torres
To: Radiance general discussion
Sent: 4/20/2005 1:12 AM
Subject: RE: [Radiance-general] mksource program


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
>
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>
>



_______________________________________________
Radiance-general mailing list
Radiance-general at radiance-online.org
http://www.radiance-online.org/mailman/listinfo/radiance-general