Hi, how can i use opengl in niftygui?
i want to draw some polygons etc…
it would be nice, if nifty supports a renderer like Graphics2D in swing.
Nifty is only a GUI. If you want you can render 3D objects to the GUI node. Search the forums, there are several threads on that subject already. 
madjack is right. you can render anything outside of Nifty what you want. There is not yet a way to draw polygons inside of Nifty ← did you noticed the “yet” in that sentence? good! 