im using a plane from the end of a cylinder as it's already cut into tris.
(I see no point in making more tris then i have too.)
I will copy the faces and make a figure with 12 points around and 2 middlepoints.
If it dosent work i will write a shader for it.
If you look at the photos you can see that the twoside boxes are ticked
Thanks for the help. I will tell you what happends ;D