I wasn't aware of that particular feature.  It appears to use the clipping method
developed by Nishita.  I couldn't find the original paper that discusses it on the
net, and I'm suprised someone had done that and I hadn't heard of it.

I got interesting results with a test scene rendered at 512x384 with no AA:

type 0 = 38 sec
type 1 = 18 sec
type 2 = 10 sec!

I'll be looking at it some more tonight.

-Mike

Ron Parker wrote:

> The superpatch and the isosurface patch have code for a "type 2"
> rendering method  for bicubics that takes an accuracty parameter
> instead of u_steps and v_steps.   It also has support for rational
> bicubics and trimmed bezier splines..  You might want to look at that
> and see how close it gets to NURBS before you set off across strange
> new territory on your own.

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