[Radiance-general] splitting a render by light sources - rtcontrib

[william reynolds]

hi

i've trying out rtcontrib on this, but whatever settings i use i seem to 
get just a black screen out. if i run rpict witht the same settings (ie 
the same view and opt files) i get a good picture (although obviously 
using all the lights).
does anyone have any suggestions what i might be doing wrong?
thanks
will

ps i am just following the example usage of rtcontrib,  given below.

Francesco Anselmo wrote:
> Hi Will,
> 
> 
>>i am trying to use radiance to render a relatively simple model
>>geometrically - just a simple room, with a box sitting on the floor -
>>but with up to 100 or so light sources. but the difference is that i
>>want to get a separte image file for each light source - i.e.  hundred
>>or so images, with only 1 light on in each. i will then use
>>superposition and recombine the images later, allowing me to vary the
>>intensities of each light source.
>>
>>is there any kind of built in functionality in radiance to allow me to
>>do this, or do i have to write a shell script or something (and if so,
>>can anyone point me towards a good place to learn how! i come from a
>>very winndows based background)
> 
> 
> Shell scripts would work, but Greg has recently added to Radiance rtcontrib:
> http://radsite.lbl.gov/radiance/man_html/rtcontrib.1.html
> 
> This man page contains already a good starting example:
> 
> "
> To generate a pair of images corresponding to two lights' contributions:
> 
>          vwrays -ff -x 1024 -y 1024 -vf best.vf | rtcontrib -ffc `vwrays -d -x
>          1024 -y 1024 -vf best.vf` @render.opt -o c_%s.pic -m light1 -m light2
>          scene.oct
> 
> These images may then be recombined using the desired outputs of light1
> and light2:
> 
>          pcomb -c 100 90 75 c_light1.pic -c  50  55  57  c_light2.pic  >  com-
>          bined.pic
> "
> 
> --
> Francesco
> 
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