Attempting Spline Projectile

I'm working on a Spline Type projectile, like the repair gun in the Tribes game. It's my first attempt to modify the engine code. I'm not sure where to start, currently I'm trying to modify the Continous laser resource to use the drawSplineBeam function. But my spline comes out straight anyway. Even though I change the x, y, z values of the points in the spline.

Anybody have an idea of what I might be doing wrong?? Perhaps I should take another aproach to this??