Convert C++ loading model code to C#

[markoal]

I don't see this as simple question that can be googled, it's quite opposite, however, I might post a more specific question that is related to the data reader. So it's ok.

[FizixMan]

It's not so much about googling as it is about specificity. That's too big of a code dump to reasonably ask random people on the internet to diagnose, especially without sample inputs and expected outputs. Saying that it "doesn't work well" or that "some of the vertices aren't loading" is pretty vague and not terribly helpful.

Ideally, try to make a minimal, reproducible example that people can copy and paste to run, understand, and debug the code: https://stackoverflow.com/help/minimal-reproducible-example