[Interest] 3D plain rendered on both sides

[Igor Mironchik]

Hi,

My custom geometry is plain. On front side it renders, but when I rotate 
it that only back side is visible then plain doesn't painted. What is 
the practice in such situation? I tried to defined back side in the 
geometry with the same positions but with normals looked at back. And 
this doesn't help. I need a plain that will be rendered on both sides.

Thank you.