Question-and-Answer Resource for the Building Energy Modeling Community
Get s tarted with the Help page
Ask Your Question

The Definition of Radiance Parameters in OpenStudio

asked 2015-12-10 20:53:23 -0500

Maryam gravatar image

updated 2015-12-16 13:54:46 -0500

Does anyone know where I can find the definition of each Radiance parameter in OpenStudio including Direct Threshold, Direct Certainty, Direct Jitter, etc.?

edit retag flag offensive close merge delete

2 Answers

Sort by » oldest newest most voted

answered 2015-12-10 22:30:28 -0500

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:

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.

edit flag offensive delete link more

answered 2015-12-26 22:27:42 -0500

More information is available in the back chapters of the book Rendering with Radiance. I sell copies.

edit flag offensive delete link more


Hello, would you please let me know how to purchase a copy of Rendering with Radiance? cj at enersave dot ca

Chris Jones gravatar image Chris Jones  ( 2015-12-30 09:59:17 -0500 )edit

I have copies for US$35 + shipping + handling. I ship globally.

I also have a few misprints (the printer left out the Greek letters, trashing much of the math, but you can still learn how to run a simulation from them) that I am remaindering for US$12 each, including shipping, within the USA. (It's just not worth shipping those internationally.)

Truth in marketing: there will eventually be a free PDF (sometime, I am determined, in 2016), but don't hold your breath.

Randolph M. Fritz gravatar image Randolph M. Fritz  ( 2015-12-30 11:45:36 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer


Question Tools


Asked: 2015-12-10 20:53:23 -0500

Seen: 407 times

Last updated: Dec 16 '15