Richard McDonald (richard++at++gossamar.paradigmsim.com)
Fri, 24 Oct 1997 13:31:16 -0500
Usually, it is. Don't know why the pointless replys came out, but they
did seem rather smart. Usually if nobody has an answer, you get nothing.
If I understand your question, you were wanting to go from world coordinates
to x,y?
Some details are needed here. World coordinates can mean anything. Usually,
models of objects, etc are created and transformed into a set of common
3d "world coordinates". Then a set of viewing parameters which define what
is being viewed, where as well as a frustum are defined and tied together
(through Performer code) and Viola... Rendering!
If what you want to find is how to convert geographic projections, then
you should consult the literature. In particular, the USGS publishes a book
entitled "Map Projections, a Working Manual" which is pretty much THE book
on cartography.
Heres a good place to start if you want to research map projections:
http://everest.hunter.cuny.edu/mp/index.html
> I see many questions posted and some answers posted.
>
> I dont know about the rest of you but this place has been of little
> help. I either get smart ass replys like the one from Eric Hirschorn
> <eric123++at++airmail.net> or information about a book to read like from
> Mario Veraart <rioj7++at++fel.tno.nl>..
>
> I ask the questions to get an answer. Is that so hard??
>
> I had the understanding that this place was for sharing knowlige. If
> you know the answer to somthing please explain it as you know it. If
> you dont know the answer just say so.
>
> Thanks for lisening..
> garrett
>
> ps.. I know I cant spell.
>
> ***********************************************
> The only stupid questions are thoes not asked.
> The only stupid answers are from thoes that dont know.
> ***********************************************
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Garrett Williams
----Richard McDonald ___________________________________________________________
richard++at++paradigmsim.com Paradigm Simulation, Inc. voice: (972) 960-2301 14900 Landmark Blvd Ste 400 fax: (972) 960-2303 Dallas, TX 75240-6725 ___________________________________________________________ ======================================================================= List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/ Submissions: info-performer++at++sgi.com Admin. requests: info-performer-request++at++sgi.com
This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:56:07 PDT