Hi Roeland,

Thanks for your reply.
I checked what was happening with the scaling.
It turns out that when using Sketchup 5 to import a Autocad dwg the scaling (millimeters) is 1:1.
However when using Sketchup 8 pro in millimeters mode the scaling is in the order of 1:4760, 1mm becomes 4760 mm.
I ...

The obj is 23344 Kb and has 98812 Tris.
I also noticed that changing the scale in Sketchup changes the behaviour when exported to Octane.
When increased sometimes a few faces come back.
I tried exporters 1024-05 and 1025-02

Hi,

Moving from 2.52 to 2,58e, faces on the X plane are gone, see image.
I created the obj from autocad and sketchup 8
Left image is rendered with 2.52 and default rayepsilon, making the faces on the X plane black.
On the middle image rayepsilon is adjusted, and faces on the X plane are rendered ...