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

[Greg Ward]

Hi Will,

You are correct that attachment sizes are limited on the mailing  
list, and people usually post JPEG images on a website somewhere when  
they want to share, if they have the option.

Please do send me your .pic file, so I can see what you're talking  
about.

Regarding pfilt, unless you use the -1 option, pfilt makes two passes  
on the file and applies and automatic scaling factor, which the -e  
option can modify.  This should be explained in the man page, which  
comes with the distribution or may be found on the Radiance website at:
	
	http://radsite.lbl.gov/radiance/man_html/whatis.html

-Greg

> From: william reynolds <william.reynolds at oriel.ox.ac.uk>
> Date: January 28, 2006 3:44:56 PM PST
>
> 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