Hello,
I am trying to put a texture with transparent areas on an invisible square. I can put it on a square, but the square shows.
When I use an alpha test, the entire unit is either visible or invisible based on the square’s alpha value. Likewise, when I blend, the entire unit is blended based on the alpha value.
I know this is possible. I hacked the billboard example by David Blythe and got it to display my texture. By pressing ‘b’ (or ‘a’) the box it is mounted on becomes invisible.
http://www.sgi.com/software/opengl/advanced97/programs/programs.html
So far I have been unable to extract what I need to do from that code. I imagine I have missed something simple.
-Brendan