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Re: IDLgrPoly[line|gon] and cv_coord [message #33483]

Wed, 08 January 2003 10:37

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Rick Towler (rtowler@u.washington.edu) writes:

> I think you should be careful how you are phrasing this. Object graphics
> uses a right-handed rectangular coordinate system. The units and view
> volume may be arbitrary but you always have a point [0,0,0] and 3 mutually
> perpendicular axes with regular intervals passing thru it which define
> [x,y,z] values.

Humm. I wonder? While it's true that I have never
used anything *but* a rectangular coordinate system
for a program, it is not immediately obvious to me
that this is the only possible coordinate system that
can be set up. I'm almost certain a (0,0,0) point is
not required. What makes you think this is the case?

I wonder is the following quote would apply here? This
was on the signature of an e-mail a friend sent to me
the other day:

"As often happens in science, the paradox was resolved
as soon as the obvious was abandoned in the face of
experimental evidence." {from a recent review in Science}

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Wed, 08 January 2003 10:37
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Wed, 08 January 2003 09:55
		Re: IDLgrPoly[line\|gon] and cv_coord By: paul wisehart on Wed, 08 January 2003 05:58
		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Wed, 08 January 2003 05:23
		Re: IDLgrPoly[line\|gon] and cv_coord By: Thomas Gutzler on Tue, 07 January 2003 23:16
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Tue, 07 January 2003 15:15
		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Tue, 07 January 2003 14:58
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Wed, 08 January 2003 13:04

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		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Wed, 08 January 2003 10:37
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Wed, 08 January 2003 09:55
		Re: IDLgrPoly[line\|gon] and cv_coord By: paul wisehart on Wed, 08 January 2003 05:58
		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Wed, 08 January 2003 05:23
		Re: IDLgrPoly[line\|gon] and cv_coord By: Thomas Gutzler on Tue, 07 January 2003 23:16
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Tue, 07 January 2003 15:15
		Re: IDLgrPoly[line\|gon] and cv_coord By: David Fanning on Tue, 07 January 2003 14:58
		Re: IDLgrPoly[line\|gon] and cv_coord By: Rick Towler on Wed, 08 January 2003 13:04