Obj not display

I try to do an opengl/c# of 3d chess using SharpGL

I'm using this [GitHub project](https://github.com/stevenalbert/3d-chess-opengl) as base.

I have use an object loader (from c++ to c#)
I've use the init code and display one object from the project
[WpfApp1.zip](https://github.com/dwmkerr/sharpgl/files/9299430/WpfApp1.zip)

but still, nothing. I don't know why 😢

can you help me ?