[Radiance-general] Render tregenza sky patches by rcontrib and pcomb

[Greg Ward]

Hi Clarence,

Rather than trying to fix Axel's old script, it's better to use the simpler and more efficient dctimestep method:

	dctimestep first_tre_p%d.hdr skydist.dat > result.hdr

You can also simplify the rcontrib step using the rfluxmtx program, but what you have is fine.

Cheers,
-Greg

> From: Wang Clarence <wangjuncwz at hotmail.com>
> Date: October 11, 2017 6:27:45 AM PDT
> 
> Dear all,
> 
> I've been trying to render the Tregenza sky patches by using rcontrib. Each patch was rendered successfully, but when I use "pcomb" which contains "tregsamp.bash" by Axel Jacobs to combine them, the "combined.hdr" was a black picture. 
> 
> #vwrays -ff $vw |rcontrib @rtc1.opt -ffc $(vwrays -d $vw) -V+ -f tregenza.cal -b tbin -bn Ntbins -o first_tre_p%d.hdr -m skyglow test_sky_sun.oct
> 
> #pcomb -h $(bash apply_tregsamp_1.bash) > combine_1.hdr
> 
> #the original bash script below by Axel Jacobs was changed in order to be consistent with my code.
> 
> 
> # Path to the patch images
> 
> imgpath="image_fisheye/patches_tre/first_tre"
> 
> for i in $imgpath_*.hdr; do
>         # Scan patch number from file name
>           patch=$(ls $i \
>                           |rcalc -i "$imgpath_p\${pnum}.hdr" \
>                            -e "\$1=pnum")
>         # Get multiplier from dat file, based on record number
>           multi=$(cat tmp_skydist.dat \
>                           |rcalc -e "diff=$patch-recno+1;absdiff=if(diff,diff,-1*diff);
> 
>    \$1=if(absdiff,0,\$1);" |total)
>           echo " -s $multi $i"
> 
> done
> 
> 
> 
> #EOF
> 
> Thanks,
> 
> Clarence
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