PVD

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Paul Levy (plevy++at++nvl.army.mil)
Tue, 11 Jul 1995 18:13:01 -0400 (EDT)

I am trying to write a simple plan-view display in Perfomer which means
I need to keep the eye point pitched straight down, scroll around
the database, and draw some routes. The first problem I have is
getting an orthogonal frustum. I use pfMakeOrthoFrust and supply
it with the channel size and also set ChanAutoAspect to
PFFRUST_CALC_NONE. When I do this, it looks as though the screen
is not being cleared because the stats start painting the screen.
Are there any other calls that have to be made to get an orthogonal
frustum beside pfMakeOrthoFrust and pfChanAutoAspect?

Second problem is that I need to be able to draw line segments
on the map. How do I get world coodinates from a mouse position
without having to pick objects.

Also if anyone has done one of these I would appreciate any
pointers.

Thanks

========================================================================
Paul A. Levy Visualization Technologies Group
Camber Corporation E-mail: plevy++at++camberva.com
7411 Alban Station Court, Ste B250 Voice: (703)866-5404
Springfield, Virginia 22150 Fax: (703)866-5409

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