[Radiance-general] Understanding rtcontrib - trouble with tregenza skypatches

[Greg Ward]

You need to *add* -bn Ntbins after your -f tregenza.cal argument.  Don't remove the -b option -- you need that as well.

The original rtcontrib didn't absolutely require -bn, although it should have.  The new rcontrib (which "rtcontrib" points to) does.

Best,
-Greg

> From: "Secure-Mail User" <harrym at secure-mail.biz>
> Date: August 26, 2013 3:08:47 AM PDT
> 
> Hi All,
>  
> I’m going through the “Understanding rtcontrib” tutorial and got stuck when trying to get the Tregenza sky patches to work (page 16). I can't figure out how to use the tregenza function and the binning with rcontrib:
>  
> DIMS=600
> vw="-x $DIMS -y $DIMS -vf views/sky.vf"
> oconv materials/testroom.mat objects/testroom.rad skies/sky_white.rad > testroom_whitesky.oct
> vwrays -ff $vw |rcontrib @rtc.opt -ffc $(vwrays -d $vw) –V+ -f tregenza.cal -b tbin -o images/patches/p%03d.hdr -m sky_glow testroom_whitesky.oct
>  
> Which returns:
>  
> rcontrib: fatal - unspecified or illegal bin count for modifier 'sky_glow'
>  
> My setup:
> Windows 7
> Cygwin
> NREL’s latest Radiance version
>  
>  
> What I tried so far:
>  
> -          Googling the error took me to the rcontrib.c source code... interesting but not immediately helpful
> -          Changing when –f ..... –b ... is specified which didn’t change the output (which is also stated in rtcontrib man page as I found out later)
> -          I checked sky_white.rad and compared it with what is shown in the tutorial. Tick.
> -          I checked my spelling multiple times..... (hopefully) Tick
> -          Replacing “-b tbin” with “-bn 146”, accidently with the view file back.vf, which resulted in a single, fairly dark picture. When repeating the command to look at the sky hemisphere, I get a uniform sky at around 178 cd/m²
>  
> Could anybody point me to my mistake?
>  
> Many Thanks in advance,
> HM
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