View Full Version : Stencil Buffer

08-19-2002, 08:33 PM
Im a new Beginner in OpenGL. I wanna know what is Stencil Buffer and what can we do by use it. I read little about it on internet, but couldnt figure out Its capability.
Is there a full tutorial with sample codes on internet that can help me.

thanks alot

08-20-2002, 03:21 PM
The Stencil buffer is an extra buffer that can restrict pixels from being drawn.

But, I have a Voodoo3 so I wouldnt know.

08-20-2002, 08:53 PM
normally.. stencil buffer was used in shadow mapping .. try to save the modelview matrix to the stencil buffer and render as shadow..

08-21-2002, 09:05 AM
I've got a question. Is the scencil buffer slow? For example if I wanted to make some shadows is the scencil buffer the best way to do it?

08-21-2002, 11:40 AM
If you are using anything more than a voodoo (TNT or above), with a 24 bit depth buffer, stencil is just about free.
Stencil shadows (shadow volumes, NOT shadow maps) are a good way to do shadows. There are plenty of discussions here on shadow volumes vs shadow maps.