Quote - o.k., thx fr renders, bill. they look very good IMVHO.  the new sponza atrium comes with
a gi_flag matl. for which they forgot to distrib. a tga file, and I found that it's badly UV-mapped,
e.g. for a rect. img. to fit it in poser, the central hanging curtain needs Uscale ~ .29, Vscale~ .58.
in render 2, luxrender: - how many bounces?

• what was lite source?

16 bounces. Light was a single infinite light in Poser. Using my (unreleased) version of LuxPose, I enabled the export of the infinite as a Lux Sun+Sky light, so it was one light, but includes the sky. However, the opening at the top is so narrow, the sky doesn't contribute very much. Most of the light is bounced light from the pool of direct illumination.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)