RE: [Algorithms] Bicubic normals for a bicubic world

[Tom F. <to...@mu...>]

I was under the impression that interpolating normals of an order-n
polynomial surface only required an (n-1) order polynomial, i.e. a
biquadratic Bezier patch in this case. But it's entirely possible I was
wrong.

Even if it's not strictly correct, I bet it would make a superb
approximation in most cases.

Tom Forsyth - Muckyfoot bloke.
Whizzing and pasting and pooting through the day.

> -----Original Message-----
> From: John Sensebe [mailto:jse...@ho...]
> Sent: 04 August 2000 01:02
> To: gda...@li...
> Subject: [Algorithms] Bicubic normals for a bicubic world
> 
> 
> Hi! I'm new to this list, but already I'm asking questions... ;-)
> 
> Does anyone here know how I can approximate the normals 
> across a bicubic
> surface (i.e.: a Bezier patch) using another bicubic? I want 
> to use normals
> for backface removal, and a simpler interpolation doesn't 
> help much. On the
> other hand, an exact biquintic solution would be too 
> expensive to compute.
> 
> Thanks.
> 
> John Sensebe
> jse...@ho...
> Quantum mechanics is God's way of ensuring that we never 
> really know what's
> going on.
> 
> Check out http://members.home.com/jsensebe to see prophecies 
> for the coming
> Millennium!
> 
> 
> 
> 
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