bezier curve code is quite simple when you get down to it.

but you don't need to - you can use bezierPoint() to get the points - see the reference (and accompanying example)

haven't used GlGraphics but it looks ok, especially with static splines.

with cubic beziers you have 4 control points. and each point on the curve is affected by all controls points.

for time t (t goes from 0 to 1, 0 being the one end, 1 being the other) the point on the curve is

(and this is from memory, so you'd better check it)

(c0 * (1-t)^3 * t^0) + (c1 * 3(1-t)^2 * t^1) + (c2 * 3(1-t)^1 * t^2) + (c3 * (1-t)^0 * t^3)

(where c0 - c3 are the control points)

so the big decision is how many segments you have along the curve (which probably depends on their length). then you can precalculate all the 1-t^n * t^n bits and store them in an array[n][4]. then every point on the curve can be calculated with just 4 multiplications by looked up values and 4 additions (ok, you'll need to do this for each dimension). it might be better to do this yourself because bezierPoint can't store the intermediate values, which will save you some processing time.

and if your splines are static then you just need to do this once, in setup. you'll end up with quite a big array of floats that you then need to pass to GlGraphics with the STATIC use parameter. but, again, only once.

will have  a play with it myself tonight.

Dude, that is so far beyond the call of duty!