Vivian Meazza <[EMAIL PROTECTED]> said:

> 
> 
> Martin  wrote:
> > 
> > David Megginson <[EMAIL PROTECTED]> wrote:
> > > Update of /var/cvs/FlightGear-0.9/data/Aircraft/pa28-161
> > > In directory baron:/tmp/cvs-serv12589
> > 
> > > Modified Files:
> > >   pa28-161-yasim-set.xml
> > > Log Message:
> > > Change camera position so that model doesn't rotate around the nose.
> > 
> > I can't withstand the impression that changing the _camera_ 
> > position didn't lead to the intended success. Take a simple 
> > stick and rotate it around one of its ends. For an observer 
> > the phenomenon is still the same even when he changes his 
> > viewpoint. If you want to rotate the stick around its middle 
> > you really have to change the centre of rotation which means, 
> > that one end of the stick goes up and the other end goes down.
> > 
> > At least in the _outside_ views the PA-28 still rotates 
> > around its nose after the recent changes,
> > 
> 
> We've been here before haven't we? In developing the Hunter model I first
> put the model origin at the nose to conform to the YASIM origin, but the
> model then rotated about the nose - most disconcerting in outside views! I
> moved the model (not the YASIM) origin to the CofG - the model behaves
> nicely in all views. It's not strictly correct on the ground, because the
> model has differential braking, and should more or less rotate around the
> braked wheel, but you would have to have a very sharp eye to spot the
> deliberate :-) mistake. 
> 

If you put the model back to the nose and use the method that the p51d and the
pa28-161 use (the target offset) you'll look better on the ground.

Best,

Jim


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