Members - Reputation: 1019
Posted 03 July 2009 - 09:15 PM
What I think you need is Alpha Testing. Take a look at lesson 32
Alpha testing uses the alpha channel to make parts of an image translucent, obviously an 8 bit BMP won't have an alpha channel but you can generate one using the source by assuming any non-black texel has an alpha of 1, and any black part has an alpha of zero.