Re: External File headers for *.flt ...

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Marcus Barnes (marcus++at++multigen.com)
Sat, 2 Nov 1996 14:17:11 -0800

On Nov 1, 11:42am, ram munjulur wrote:
> Subject: External File headers for *.flt ...
> Hi :
>
> We have a database.flt which references a lot of external *.flt files.
> The header block for database.flt has the Origin/SW corner etc. set to
> some values. And so do the external files. Do we need to have the same
> Origin values in the header blocks of the external *.flt files ?

This header information is not used by the OpenFlight loader. It is exported
to the application for your own use. The coordinates of scene graph geometry
is unaffected, unless you are applying a transform based on the header origin
or lat/long information. I expect that Vega's LADB module uses the information
to page areablock tiles and position them wrt each other.

> We were wondering if this was causing the problems of getting negative
> HAT even though the eyepoint was above the ground in database.flt.

How are you obtaining your HAT values? Perhaps you just need to negate the
vector?

Regards.

--
+ Marcus Barnes, Technical Staff        mailto:marcus++at++multigen.com +
+ Multigen Inc.                         http://www.multigen.com    +
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