On 10 Mar 2000 10:53:44 -0500, Nieminen Juha wrote:
>  The abstract looks very interesting. This might be it.

Coincidentally, it also contains a bibliographic reference to the
NSK used in the type 2 bicubic patch you asked about over in .general:

  Tomoyuki Nishita, Thomas W. Sederberg, and Masanori Kakimoto.  Ray
  tracing trimmed rational surface patches.  In /Computer Graphics (SIGGRAPH
  '90 Proceedings)/, pages 337--345, August 1990.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html

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