Faces error? What does this mean and how can I fix it?

[Intuition]

"Some faces of R12__FA_flag_stitched_macro_panels_geoShape@mesh1@ subdivGeometry were removed because they were duplicates of other faces. // "

I can't figure out why this is happening but I am sure its slowing the scene render time down.

I would suspect laminar faces but I don't see any.

[Morbid Angel]

I had a similar case not so long ago. It happens when you have faces with n_sided, or faces with 0 area. In my case there were nsided faces, which were causing the subdivision to print this message. Quadrangulating them fixed the problem.

[Intuition]

Been trying to address this today. You know what would help me? Since Vray has a way of telling me that some of the faces are duplicates can it also use the same method that spits out that message to actually select the faces that are causing it? It would make my trouble shooting much easier. I've exported the mesh from Maya to modo. Couldn't find any laminar faces or zero area. Sent back the OBJ and ended up with the same error. There has to be a way of getting rid of this. Just need vray to show me which faces are causing it (by running script or process and putting those faces into an array I can use for selecting like /string $duplicateFaces[]/ select $duplicateFaces / etc.

[Dariusz Makowski (Dadal)]

I usually export stuff to OBJ with no extra data, no normals, no textures etc etc. Export it in different options polygon/quad/trial. Then import it and it should work.

[t.petrov]

I can't figure out why this is happening but I am sure its slowing the scene render time down.

This message is printed because we try to clean the mesh before we do generate the subdivision surfaces
If we don't do this step you'll get crashes, cracks and other nasty artefacts.
Unfortunately I'm not sure if it will be possible to generate a select command for the offending faces, because this step happens during rendering and not during export.

Also the possibility for this step to cause slow downs is minimal.
What are you subdiv settings?