Weird behaviour when porting a book exercise to Silk.Net

[lehmamic]

Hi guys,

I'm reading the book Game Programming in C++ from Madhav Sanjay. I did the exercises in CPP and am now porting it to Silk.Net. Rendering Sprites works so far, but I have the problem, that my Qube does not get rendered properly.

I have no clue what it could be. Just some background info:

• The book uses row based vectors in a left-handed coord system.
• I'm trying to port the code 1:1, or at least as much as possible.

Here is my code:
https://github.com/lehmamic/GameProgrammingExercises

I'm to of ideas what it could be, I would appreciate your help very much, thanks.