Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
You can find the meanings of these parameters in the Radiance man pages, which are distributed with Radiance and also happen to be online. For instance, the man page for rtrace is here:
http://radsite.lbl.gov/radiance/man_html/rtrace.1.html
In this file, you will find the definitions of the parameters Direct Threshold (-dt), Direct Certainty (-dc), Direct Jitter (-dj), and others.
If the descriptions there don't provide you with enough detail, you may want to refer to the book Rendering with Radiance for more information.
