Hi all,
since the Radiance 2010 workshop CD, in which it was planned to be
added, seems still in the making, and in light of Andy McNeil's nicely
done and informative three-phase tutorial, it might be worthwhile to
mention that the workshop talk on
bidirectional-reflection-transmission-data (BRTF, BSDF, BTDF, etc)
basics, measurement and modelling had already been put at
http://www.pab-opto.de/radiance/pab-brtf-talk.web.pdf . It gives some
compact summary from solid angle to BRTF, some basics on measurements
and some thoughts based on previous experience with Radiance BRTF models.
For those who are primarily concerned about how to get measured BRTF
into Radiance at all, LBL's newly introduced, matrix based approach is
certainly a big step forward, that is vital to handle measured BRTF +
Radiance in a general, project oriented, way.
For folks who endeavour to explore the BRTF world closer, and without
going into too much detail here, there still seems good reason to
consider a matrix based approach as not quite optimal for many of the
most interesting materials. For the entertainment of the curious,
reasons are given in the last 10 pages or so of the talk. Funny bit to
mention: Both views are based on the same data generating measurement
gonio-photometer (http://www.brtf.info/?d=/gonio-photometer).
Whether or not this will influence any further and/or additional ways of
getting BRTF data into the Radiance simulation program in an adaptive
and sleek way, with less steps on the user-side, is to be seen.
Technically, there are one or two fairly major programming tweaks to
this, and both are inside the current rendering core code.
happy rendering,
feedback appreciated
Peter
PS: cross-posted to radiance-dev, in case of further technical threads
--
pab-opto, Freiburg, Germany, http://www.pab-opto.de
[see web page to check digital email signature]
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