Settings for "perfect" 45 degree shadows?

[brodie]

I'm doing a building elevation in CAD that I'm going to put some color onto and shadows. My thought was that it might be quicker to model the elevation is SU real quick, turn off the edges, and darken up the shadows to photoshop in later (as opposed to hand doing each shadow in cad).

However, I'd like to get the perfect 45 degree shadows as if they were hand calculated.

Does anyone know some good settings to get this effect (location, time, date, orientation, etc.)? It doesn't have to be perfect but really close at 1/8" scale would be great.

-Brodie

[thomthom]

The Elev45shadows.rb ruby from http://www.crai.archi.fr/RubyLibraryDepot/Ruby/EM/

[brodie]

Just what I needed. Thanks Thomthom!

-Brodie