RE: The PolyBezier Element In CGM

[Dieter@isodraw.de (Dieter Weidenbrueck)]

Hi Dave,

we had a quick look at the situation:

The wording in the CGM standard suggests that (Xi, Yi) be the coordinates of
Pi (i = 0,...,3). Using the shown formulas it is straight forward to get to
the right polynomes. The alternative definition of Dick Fuhr results in the
same polynomes.

Both definitions are equivalent.

Dieter

-----Original Message-----
From: Cruikshank, David W [mailto:david.w.cruikshank@boeing.com]
Sent: Montag, 8. Oktober 2001 18:17
To: 'cgmopen-members@lists.oasis-open.org'
Subject: FW: The PolyBezier Element In CGM


Group,

Our friend Dick Fuhr has been working on the Polybezier element for BoGART,
so he started looking at its definition in the standard.  He ran into some
problems like he did when he was investigating NUBS/NURBS.  Attached are his
comments for discussion.  Let me know what you think.

thx....Dave

>
>
>  -----Original Message-----
> From: 	Fuhr, Richard D
> Sent:	Tuesday, October 02, 2001 3:46 PM
> To:	Cruikshank, David W
> Subject:	The PolyBezier Element In CGM
>
>  <<PolyBezier.doc>>
>
> Dave,
>
>    Here is my first cut at a proposal for revising the CGM spec for the
> Polybezier element.
>
>    Let me know what you think; and where do we take it from here.
>
> Thanks,
>
> Dick