[Radiance-general] if statement with vwrays

[Christopher Kings-Lynne]

> ./vwrays.exe -fd someRender.pic | rtrace -fda `vwrays -d zoomsomeRender.pic`
> -oodLpnsm `if(s='greenbox')` testroom.oct > rays.txt

Look at the HOWTO section in the Radiance Wiki:

http://www.radiance-wiki.org/index.php?title=HOWTOs

Speaking of...looks like the radiance wiki is now a link spam target.  Hmmm.

Chris