Michael Selig wrote:
 > I can ask this differently.  What sets the height above the runway of
 > the hud-ladder target spot (wrt the 3D model view) --- ie the center
 > spot?  For c310-yasim and c172-larcsim, it's above the runway.  For
 > UIUC models, it's below the runway (a recent change).

Where are you placing the coordinate origin of the aircraft?  There
was a confusion/unification about this recently, with the consensus
being that the origin should be, by convention, at the front of the
aircraft (either the nose or the firewall, depending on who you ask).
Strictly, the coordinate origin of the aircraft and the 3D model
should be exactly coincident (or as coincident as practical, given
that there are multiple FDMs and a model file that all have to agree).

If the UIUC models are reporting an altitude of zero while on the
ground, you'll see this effect.  The real altitude should be a few
feet -- however high the nose rests off the ground.

Andy

-- 
Andrew J. Ross                NextBus Information Systems
Senior Software Engineer      Emeryville, CA
[EMAIL PROTECTED]              http://www.nextbus.com
"Men go crazy in conflagrations.  They only get better one by one."
  - Sting (misquoted)


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