Using Quaternion

I've never heard of quaternion until now.  http://en.wikipedia.org/wiki/Quaternion

Cocoa provides access to the Quartz Graphics for 2D graphics and OpenGL for 3D.  I think it's unlikely that you're going to find cocoa code already written for quaternion - however you may something else (for example PostScript) which can be readily adapted for display by Cocoa.  

Thanks for the reply, actually we are using Quickdraw 3D, which had build in quaternion. Just need an example