[Radiance-general] Distribute the brightness of the sun over a sky patch

[John Mardaljevic]

Hi Alejandro,

There's basic material on (pre-rtcontrib/neolithic) use of Radiance to predict daylight coefficients in 'Chapter 6' here:

http://climate-based-daylighting.com/doku.php?id=resources:thesis

Cheers
John

PS.  I ditched the 'Aimed Rays' approach about 10 years ago and now use ~900 "light" sources (i.e. solid angles) per Tregenza patch.  Probably overkill, but it's quick nonetheless.  The 'aimed rays' approach only really worked for clear glazing, whereas the many light sources per patch will handle diffusing and redirecting materials described by cal files.

John Mardaljevic
Professor of Building Daylight Modelling
School of Civil & Building Engineering
Loughborough University
Loughborough
Leicestershire
LE11 3TU, UK

Tel: +44 1509 222630 (Direct)
Tel: +44 1509 228529 (Pam Allen, secretary)

j.mardaljevic at lboro.ac.uk<mailto:j.mardaljevic at lboro.ac.uk>

http://www.lboro.ac.uk/departments/civil-building/staff/mardaljevicjohn/

Personal daylighting website:
http://climate-based-daylighting.com<http://climate-based-daylighting.com/>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20140225/c8047ff4/attachment.html>