Re: Do Performer math routines only use

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Jeff Brickley (jbrickley++at++lmwsmr.lesc.lockheed.com)
Thu, 20 Mar 1997 09:34:24 -0600

We had to solve the problem by doing geodetic transforms to a "local"
coordinate system. We have the difficulty that we have multiple inputs from
various coordinate entries, so we had the math already done. Once we
discovered the problems with geocentric XYZ, we converted the database to a
local tangent to the ellipsoid and plot everything in the local frame of
reference. We had to still build a flat LOD for the lowest LOD because high
altitude operations still affect the appearance....

Jeffry J. Brickley
NewTec
New Mexico Technology Group, Ltd.
White Sands Missile Range

 ----------
From: Eric Snowberg
To: info-performer
Cc: src
Subject: Re: Do Performer math routines only use
Date: Wednesday, March 19, 1997 6:28PM

We have experienced the same problem with round off errors when using
geocentric coordinates. We would also be interested in a way to represent a
pfCoord/pfMatrix using double precision floats. Are there any other
solutions
to this problem?

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