Issue with inward-facing normals upon intersection

[Josh Camp]

Hey all,

I've recently been running into issues with my workflow of going from OpenVSP --> CompGeom --> Export Cart3d tri file --> Cart3D...Cart3D has been failing in 'cubes' for any case where I've intersected a wing into a fuselage.  At first I thought it was a Cart3D issue, but then on a whim I used an old install of OpenVSP (3.43.1 instead of the 3.45.1 I'm currently on) in the workflow and the issue went away.

I've attached a representative example vsp geometry, as well as the two .tri outputs I get using 3.43.1 and 3.45.1 respectively. From what I can tell, the OpenVSP routine that does geometry intersection ends up flipping the surface triangle orientation of the wing and therefore the surface normal directions are flipped--but only for the wing, the fuselage orientation remains the same.  It doesn't look like it's just a Cart3D output issue either...if I try to use CFD Mesh in 3.45.1, it fails due to the geometry not being watertight (with the failure highlighted right at the wing-fuselage intersection), but using it in 3.43.1 works just fine.  And the CompGeom output shows a negative volume for the Wing after intersection for 3.45.1

I can go back to using 3.43.1 in the meantime for my workflow, but wanted to highlight this as a potential bug for the team.  Thanks!

Josh Camp Director of Vehicle Engineering jo...@venusaero.com C: 281.381.8354

[Rob McDonald]

This was a bug that existed in 3.44.3 and 3.45.1 only.

It has been fixed in 3.44.4 and 3.45.2.

Let me know if you still have trouble.

Rob

[Josh Camp]

Ah ok, thanks Rob.  I'll get 3.45.2 installed and report back.

Josh Camp Director of Vehicle Engineering jo...@venusaero.com C: 281.381.8354

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[Josh Camp]

Can confirm issue is gone with 3.45.2.  Thanks!

Josh Camp Director of Vehicle Engineering jo...@venusaero.com C: 281.381.8354