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

[william reynolds]

hi all
so i managed to get rtcontrib to produce me a picture - it turned out to 
be a combination of the suggestions people wrote, but noteably the need 
to adjust the exposure.
however the image that i'm producing has terrible jagged edges to the 
lit area. (i'm using the spotlight primitive, with penumbras turned off 
- so i should get a clean, sharp pool of light on the wall.)
it looks to me much worse than aliassing, but i dont know whether thats 
true.
i have tried pfilt on the .pic file, reducing the size and adding a 
little gaussian blur, but that doesnt fix the problem.

does anyone have any suggestions?
here is my opt file for the rendering settings:
-dp 2048
-ar 64
-ms 0.13
-ds .2
-dt .05
-dc .75
-dr 3
-sj 1
-st .01
-ab 3
-af theatre.amb
-aa .125
-ad 512
-as 64
-av 0.062 0.062 0.062
-lr 12
-lw .0005
-av 0 0 0
-ad 500
-ab 10
-aa 0.01

and i'll happilly email anyone the .pic produced. (im assuming i cant 
put attachments on this list.)

while i'm writing, im a bit confused by the exposure settings for pfilt, 
perhaps someone could shed some light on that for me. i seem to be able 
to run:
pfilt -e 1 image.pic, and get a very  bright image back, when i cant see 
anything but black in the original. - i thought that -e 1 would mean 
multiply by 1, so no change, is that wrong?

thanks for your help.
will





Thomas Bleicher wrote:
> 
> 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
> 
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