Interact whit 3D UI

Hello i have a question.

See this image

alt text

This is a simple fps game,
In this game the player can interact whit computer.
Click button and navigate in the menu.

I tried many methods.
I also used a render to texture for simulate this.
but does not work.

anyone know a method for make this?

You can do this with the new Unity UI system. Just create a World canvas.

http://docs.unity3d.com/Manual/HOWTO-UIWorldSpace.html