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Re: Graphics pipeline (was Re: crazy contour) [message #53885]

Thu, 03 May 2007 13:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Francis Burton writes:

> Useful! As a matter of interest, what does the following mean?
>
> "...the X and Y vectors, if supplied, must be arranged in
> increasing order. This ensures that the polygons generated
> will be in counterclockwise order, as required by the mapping
> graphics pipeline."

I think it just means that if the order is confused, the
algorithm that generates the filled polygons can't tell
up from down and behaves sort of like Coyote after 3-4
margaritas on Friday afternoon at the Rio. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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