Anthony J. Farrell wrote:
Thanks Roland, Martin for input,
I meant to make to reference to the Prism1 and Prism2 commands in the 3.5
release of Radiance. I am uncertain of the function file command linemod prism1 id
5+ coef dx dy dz funcfile transform
0
n A1 A2...An where the new direction variablesSo if I wanted to redirect light from a vertical glazed window down at an
angle of 45 degrees onto the working plane what values would I substitute in
for A1 etc?
According to the manual, dx, dy, dz are the redirection coefficients, presumably applied to the incident ray's local coords. A1.. An are optional variables passed to the funcfile. However, having never used the PRISM material, I dunno for sure -- better check with Raphael Compagnon.
Roland, Is it possible to use Prism1 or Prism2 commands in the PMAP version
of Radiance to forward raytrace from the photon port (the target light
(*luminance* source?)to the target illuminance source (the working plane)?
Beats me. :^)
Seriously, I never tried. I only included support for the more common materials. Looking at the code, it would appear that the PRISM material simply acts as a secondary light source -- a concept that is invalidated by the photon map anyway. Furthermore, the source vector [DxA, DyA, DzA] would be undefined, since it's only available specifically for this material. My guess is it simply won't work and immediately bail out since there's no scattering routine for this specific material.
You'll probably have to go the hard way and model the prism explicitly using instances, like the Y-glass example on the pmap webpage. This is extremely ugly, but it's the only solution I can envisage in your case.
--Roland
ยทยทยท
--
Roland Schregle
PhD candidate, Fraunhofer Institute for Solar Energy Systems
RADIANCE Photon Map page: www.ise.fhg.de/radiance/photon-map
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