Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
There are two common methods to perform annual glare analysis with a matrix method.
The first is to use vertical illuminance at the eye with simplified DGP (DGPs). For this method you calculate vertical illuminance in the same way you're calculating workplane illuminance at points. See equation 1 in this paper for how to calculate DGPs from vertical illuminance: http://www.ibpsa.org/proceedings/BS2009/BS09_0944_951.pdf (also this paper is a good resource for understanding your question in general).
The second method is to use a rendered view matrix, create hourly renderings using dctimestep, and then running evalglare on the hourly renderings. This option takes much more time computationally, but is necessary to get an accurate assessment of glare in cases where glare sources are relatively small. Sarith's tutorial covers how to use vwrays with rfluxmtx to generate a rendered view or daylight coefficient matrix (https://www.radiance-online.org/learning/tutorials/matrix-based-methods).
