[Radiance-general] modeling a fresnel lense diffuser
Lars O. Grobe
lars.grobe at nus.edu.sg
Fri Feb 20 02:28:29 PST 2009
Hi,
I have to model a diffuser which consists of an array of fresnel lenses,
and I want to be able to use the pmap extension. Is there any other way
then modeling the lenses' geometry (or its equivalent full lenses')? As
far as I got it, I cannot model it in prism2, as the distance from the
lense center is not available when calculating the outgoing ray. Generic
brtf is not supported with pmap.
I guess the best way to determine the properties of the lense is a laser
pointer, millimeter-gridded paper and moving the pointer parallel to the
lense surface, right? Or is there another way recommended for those of
us who do not have a full equipped lab at home?
I have that strange feeling that I am leaving Radiance's application
focus right here, but this is something quite relevant. These diffusers
are commonly used with ligh redirecting systems, and these systems can
be (and are) modeled using Radiance+pmap.
CU... Lars.
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