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Re: IDLgrPoly[line|gon] and cv_coord [message #33503 is a reply to message #33502]

Tue, 07 January 2003 14:58

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

paul wisehart (wisehart@runbox.com) writes:

> I can't find any info on the coordinate systems used in object
> graphics in the manual either. Maybe someone know's where to look?

You look in the mind of the programmer that created the object. :-)

The thing about object graphics is that there *is* no
coordinate system, except the one you arbitrarily set
up with the view object. That is to say, the viewplane
rectangle, and the near and far clipping planes define
the view volume, which *is* your coordinate system.
The units of this coordinate system are completely
arbitrary. You make them up.

Of course, this is one of the huge advantages of object
graphics: you really can't do it *wrong*. :^)

Cheers,

David

P.S. But let's just say if you don't really know what
theater you are playing in, it's a bit of a trick
to get all the actors to show up at the same place
in time for the show. I'd say that's the main challenge
of object graphics, in a nutshell. :-)

--
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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[Message index]

		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