glScissor - rectangles

[holy_moly]

hi there,
using glScissor will cut out a rectangle from the scene.
Now i thought about cutting out circles and stuff...for example,i thought about creating a scene with a view through binoculars..

o.k.,i could put some large disks and stuff in front of the scene making it look like binoculars ,but i don't want to.
So ,is there a function to do this?

[dmy]

look for the stencil buffer, it is what you need.

Dolo/\/\ightY