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

[Thomas Bleicher]

On 24.01.2006, at 15:48, william reynolds wrote:

> 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?

Fist guess: 	Is the image realy black or just very,very dark?
		Remove all lights except "light1" and "light2"
		from the scene and check the rvu/rpict image.

Second guess: 	Do you have _materials_ in your scene that are
               	assocciated with lights and are the name those
               	you gave with the "-m" option?

For the example below the materials "light1" and "light2" should
be defined in your scene and used for i.e. a polygon or a sphere
("geometric primitives", first paragraph of the man page).

>> 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


Thomas