Re: Help for a beginner!!

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Andy Shein (ashein++at++orac.boston.sgi.com)
Tue, 8 Apr 1997 10:13:16 -0400

On Apr 8, 9:27am, Christopher R Volpe wrote:
> Subject: Re: Help for a beginner!!
> > The base performer coordinates are y into the screen, x to the right
> > and z up. This is different from OpenGL
>
> Just out of curiosity, why would the Performer designers use a different
> coordinate system from that used by OpenGL?

   I think it was because that is the coordinate system
used in a lot of graphics books.
    It would have been nice if it was x fwd (into the screen)
y right and z down. This is the coordinate system used in
most books I have seen on vehicle dynamics. This way
positive yaw is to the right like a compass, and
pitch is positive up.
   BTW how many people would like to see this
coordinate system supported in the follow on product
to Perfomer ???

                Andy "too long silent on z-down coordinates" Shein

>
>
> --
>
> Chris Volpe Phone: (518) 387-7766
> GE Corporate R&D Fax: (518) 387-6560
> PO Box 8 Email: volpecr++at++crd.ge.com
> Schenectady, NY 12301 Web: http://www.crd.ge.com/~volpecr
>-- End of excerpt from Christopher R Volpe

-- 
Andrew Shein   SE Stout               email: ashein++at++boston.sgi.com
Silicon Graphics Inc.                 phone: (508) 562 - 4800
1 Cabot Road                            fax: (508) 562 - 4755
Hudson, MA 01749                      vmail: 59688
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