Re: Lat/Lon

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Graham (graham++at++beast.asd.sgi.com)
Mon, 8 Jul 1996 17:38:18 -0700

I've done lat/lon conversions successfully zillions of times (and
unsuccessfully zillion-zillions!). To answer inteligently I need more info and
suggest you email me directly (graham++at++sgi.com). You don't mention whether
you're looking at your map orthographically or obliquely, if obliquely then you
have to go through all the 2D to 3D, screen coords->3D coords-> db, etc. first.
 If it's a straight 2D projection should be easy. If a 3D problem this could
become mega-fun if you have to start figuring out what map projections you are
using, etc. The good news is there is lots of free code on this.

GB

On Jul 8, 5:54pm, Cris Villarma wrote:
> Subject: Lat/Lon
> Hi,
> I'm wanting to correlate the mouse position with
> latitude/longitude positions on a map using Performer.
> I.e., if the mouse is at screen position (10,10), I want
> to know that correlates with, for example, 112W, 32.5N.
>
> I've written a few functions to convert to/from world
> and screen coordinates, but when I position the mouse
> on a known position on the map, the numbers aren't right.
>
> If my conversion functions are right, what am I forgetting?
>
> =======================================================================
> 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 Cris Villarma

-- 
----------------------------------------------------------------------
Graham (Grambo) Beasley		Silicon Graphics, Inc.
MTS (Simulator Guy)		(415) 933-5420		graham++at++sgi.com
----------------------------------------------------------------------


"Being fair is not always convenient!"
			  Javier's Father




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