You are here: Home / Community / Workshops / 2005 - Montreal / abstracts / Ward1.html

Abstract: Radiance's New Rtcontrib Program 
Greg Ward (Anyhere, USA)

Flexible as it is, radiance is already an integrated quantity and does not tell us everything we might want to know, such as how light traverses an optical system. Until now, such calculations could not be performed by Radiance's core engine due to this basic formulation. With the 3.7 release, we have added the capability of reporting contribution coefficients during ray traversal, permitting general ray-tracing evaluations. However, this new -oTW option to rtrace may produce gigabytes of data, so we have also introduced a program for integrating and managing this information, called rtcontrib. Rtcontrib controls rtrace and tallies ray contributions in a flexible fashion, permitting efficient calculation of daylight coefficients, optical transmission, and other quantities produced as images or collections of floating point coefficients. During this talk, the author will describe rtcontrib's basic operation and demonstrate a daylight coefficient calculation using electrochromic glazings as one example of its use.

 

by AMcneil – last modified Feb 29, 2016 12:26 PM