[Radiance-general] Access to outgoing radiance at polyhedra level

[Greg Ward]

Hi Olivier,

The simplest method is to use rtrace.  You can separate your polygons by name with:

	vwrays [resolution & view options] | rtrace -h -osv scene.oct | sort > surfaces.txt

You should get a selection of radiance values for each surface based on the selected view.  If you want orthonormal values for _every_ polygon, not just those visible from one perspective, more sophisticated methods are needed.  You would have to read in the scene file and generate a custom view for each polygon.  It can be done, but it might require some scripting/programming to accomplish it.

-Greg

P.S.  If you want irradiance/illuminance values rather than radiance/luminance, use the rtrace -i option.

> From: Olivier Penacchio <op5 at st-andrews.ac.uk>
> Date: November 12, 2013 5:36:30 AM PST
> 
> Hi Everyone,
> 
> I am using Radiance to render objects using realistic lighting conditions.
> 
> The objects I use are represented as triangulated polyhedra. Currently I'm accessing
> the radiance outgoing from the objects in a scene using rendered images (rpict and then pfilt)
> of the scene (with no information anymore on each single triangle).
> 
> I am wondering whether it is possible to have access to the
> radiance outgoing from each triangle directly (as a list of values, one for each triangle
> for example)?
> 
> I'm running minGW radiance in windows (with a Matlab wrapper), but could
> switch to Linux if required.
> 
> Best wishes,
> Olivier---
> 
> Dr Olivier Penacchio---
> School of Psychology & Neuroscience
> St Mary's Quad
> South Street
> St Andrews
> Fife
> KY16 9JP
> Scotland, United Kingdom
> Tel: +44 (0) 1334 462099
> Fax:+44 (0) 1334 463042
> Email:op5 at st-andrews.ac.uk
> 
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