I can't remember off the top of my head. (Long time since doing any OGL)
This isn't really an API specific mailing list but you should be able to find everything you need on www.opengl.org
-----Original Message-----
From: Iker@gamepro.es [mailto:Iker@gamepro.es]
Sent: Wednesday, July 18, 2001 4:38 PM
To: gdalgorithms-list@lists.sourceforge.net
Subject: [Algorithms] Making an object transparent in openGL

Hi there!

I would like to make a 3d rendered object transparent acording to a global factor. Imagine a cube. It is completely black while rendering. Now I set my material/shader (call it as you whish) to a transparency factor of 0.5 anf then the cube "bends" with the background image. What openGL calls do I have to do to make this happen? In a software renderer this sounds pretty simple, but I dunno how to accomplish this prob in openGL...

Thanx... maybe is a very simple question...