Hi @coltonphillips, I am afraid we do not have a sample application ready for use with the Tobii EyeX/C4 which illustrates exactly what you are asking for. Indeed, however it is quite possible to implement.
The Tobii Pro SDK includes such an example though unfortunately is not compatible with the EyeX or C4.
Never the less, the code show at least show you the best way to setup the geometry to be shown on screen. You can download the ‘3D Eyes’ sample online @ http://www.tobiipro.com/product-listing/tobii-pro-analytics-sdk/#Download
Hopefully this should show you the best way to setup the application if nothing else.