Check out: http://www.nvidia.com/Powerof3d.nsf
And have a look at the lightning demo. In the mpeg of the demo it shows it in wireframe at one point(I don’t know about the demo itself as I don’t have a GeForce). What I’m wondering is how they achieved the spark effect. It looks like the same effect achieved in Half-Life for sparks and I had thought that it was a GL_LINES type of thing but after seeing this demo in wireframe, it’s not. It looks like a distorted quad. But it’s not being billboarded quite. It changes shape depending on its orientation. But then how are they mapping the spark effect onto the quad? Anyway, thought this might add some to the board. Thanks!