Converting LDraw parts to WPF

[Victor Di Rienzo]

Hi All,

I'm trying to convert Ldraw parts to use in a Windows Presentation Foundation program, written with visual basic.
Drawing a 4-4disc.dat file for a stud.dat the triangles are CCW that's correct.
stud3.dat uses the same disc, so still CCW and so not visible from the bottom.
The disc has shift down de y axis. I imagen that when it flips so x,y become -x, -y it would be correct.
I use the buildin 4x4 Matrix3d and fill it like the LDraw explanation mentioned. 
What am I missing?

Regards, Hans

Van you make a tutorial how you make them?