I have a model from Sketchup and it is a closed mesh. However some of the normals are facing in and the others out. Is there a tool to fix that and check it. 
For some reason it did not work on this mesh. Do you know how to select one face of a mesh? Then I could flip that normal manually. Will take some time.
Hello - see if ExtractDuplicateMeshFaces does anything. My guess is it will ‘duplicate’ your mesh…
-Pascal
I think this model is a totally jankie file. But it is what I get a lot of. The extractduplicatemeshfaces extracted a couple of faces.
It would be useful to know how to select a single mesh triangle so i can flip it.
Hello - try RebuildMesh.
-Pascal
Hi -
ExtractMeshFaces
-wim