[Radiance-general] Mesh smoothing
Phillip Greenup
[email protected]
Mon, 06 Aug 2001 11:40:23 +1000
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Russell,<br>
<br>
We have successfully modelled the refractive light redirection system
known as the 'laser cut panel'. It is simply a sheet of acrylic
with laser cuts in it. The cuts redirect incident illumination by
total internal reflection, giving the panel very powerful light
redirecting properties. The algorithm to model the device is based
on some simple geometrical calculations of directions of deflected and
undeflected rays, and relative intensities of the rays. The
modifier used is the prism2 material. For more info, check the
paper in Lighting Research and Technology:<br>
<br>
Greenup, P.J., Edmonds, I.R. and Compagnon, R. (2000), <i>Radiance
Algorithm to Simulate Laser-Cut Panel Light-Redirecting Elements,
</i>Lighting Research and Technology<i>,</i> 32 (2), 49-54.<br>
<br>
I have also developed some algorithms to model reflecting light
redirecting devices, known as light guiding shade panels. The
process is:<br>
model the flat reflective surfaces as polygons, the curved reflective
surfaces using gensurf<br>
run oconv with the appropriate room and sky definitions<br>
set a void output surface adjacent to the inside of the light redirecting
device<br>
run mkillum with appropriately high settings of the -s and -d parameters
in particular<br>
add the resulting geometry using oconv -i ...<br>
get your pictures, illuminances, etc as usual.<br>
<br>
the results for each algorithm have been compared against measurements in
labs and in test buildings, and compare well. if you would like
more info, or the calculation file for the laser cut panels, let me know
and i will be happy to send it to you.<br>
<br>
Regards,<br>
Phil Greenup<br>
<br>
<br>
<blockquote type=cite cite>On a side note I am also looking at modelling
light redirection systems (horizantal/vertical<br>
glazing) and refractive systems. I have looked at some of the designs on
<a href="http://www.schorsch.com/" eudora="autourl">www.schorsch.com</a><br>
and attempted to model them using AutoCAD or a gen program then assigning
a dielectric<br>
material. Does any else have experience with creating these and would it
be possible<br>
to use a different modifier? I am looking for the most accurate
calculation.<br>
<br>
Thanks<br>
<br>
Russell Maunder<br>
<br>
BBSc (hons)<br>
Victoria University of Wellington<br>
School of Architecture and Design<br>
New Zealand<br>
</blockquote><br>
<div>Phil Greenup</div>
<div>Centre for Medical, Health and Environmental Physics</div>
<div>Queensland University of Technology</div>
<div>GPO Box 2434</div>
<div>Brisbane Qld 4001 Australia</div>
<div>Ph (07) 3864 5362</div>
<div>Fax (07) 3864 9079</div>
Email [email protected]
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