How to make a 3d gui slider?

How would you do this? Is possible? If it is can someone give me instructions ans a script!

i can’t give you a script right now…but i can give you the idea.

you have to create an external camera…and 3 planes…all you have to do is to set the camera to only render the two objects and the two planes should be like this:

plane 1 for background, plane 2 for foregrounf (if using progress bar), plane 3 for the button…and do your move and other things in a script

The first two planes sound like a plan ,but I can use other things for the design. It doesn’t have to be planes right?

you can use any thing since its using a different camera and render above everything

I have not done this in Unity, but i did attempt something of the sort in UDK
ex: http://youtu.be/E3ISJJhVqv4

Maybe use the same approach?