Strange movements of elements during performing Elements.Rotate (modified)

[Yna_Db]

I don’t have much time to dig into python at this moment (the package called Basic_Python_Template could help), but we have struggled many times with family instances rotation on the forum. I ended up using FamilyInstance.ByFace and it could worth a try. See here:

Automatic road creation: How to generate solid between section profiles?

I built up a solution to solve instances orientation problem based on what I previously did here: Thanks for giving me a serious opportunity to develop this idea. To sum up, the idea is to place family instances with the node FamilyInstance.ByFace because it gives more predictable results. To do so, I place tiny circles that creates the needed faces on the selected normals of the curve. I used a profile drawn on the XY plane of the mass family but it could be re-oriented with the Vector.Rotate …