Those might be coming from mental ray's geometry core.

Activate debugging in your render settings, then render portions of the frame 
using the render region in a divide and conquer approach as only the tiles 
inside the region will be rendered and reported in the log.  There will be a 
TON of output, so be patient.  The error should reveal itself before too long.

Matt



From: [email protected] 
[mailto:[email protected]] On Behalf Of Ponthieux, Joseph 
G. (LARC-E1A)[LITES]
Sent: Wednesday, November 20, 2013 11:45 AM
To: [email protected]
Subject: face_list or faceless?

I've got a scene that is giving me these errors. I've got a lot of models in 
the scene. Any ideas on what I should be looking for or how to narrow it down 
to the offender without deleting every model one by one?

# ERROR : GAPM 0.16   188 MB error  091017: zero faces in face_list
# ERROR : GAPM 0.16   188 MB error  091071: retrieval of data base items for 
surface conversion and curve conversion and  approximation failed
# ERROR : GAPM 0.16   188 MB error  091007: retrieval of data base items for 
surface conversion and curve conversion and approximation failed

--
Joey Ponthieux
LaRC Information Technology Enhanced Services (LITES)
Mymic Technical Services
NASA Langley Research Center
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