I have few thousand planar footprints generated from curve data exported from Microstation.

Because of the way the curves were drawn some of the face normals point Y-UP (what i want) while others point down in negative Y axis (what i dont want)

In order to not have to go in and manually check and reverse normal direction for thousands of footprints i wonder if anyone knows of a script that does this?

Or knows the MEL or Python syntax for making a looop that iterates through the polygonal geometry in the scene, or a selection list and sets the normals for all the selected geometry to point Y-UP..

Thank you in advance

I’m sure this can be done with 2 lines of MEL, but for fun: