LeeE wrote

> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On 
> Behalf Of 
> Sent: 11 March 2008 23:19
> To: FlightGear developers discussions
> Subject: [Flightgear-devel] New problem with submodels
> 
> 
> Hi,
> 
> For a long time now I've been using ballistic submodels for 
> trajectory markers.
> 
> When using the trajectory markers, a simple inverted 'T' two line 
> object is created at the aircraft position once per second, aligned 
> with the aircraft roll and pitch axis.  The submodels have no 
> weight, 0 buoyancy and are unaffected by wind, so once created they 
> remain in place and provide a representation of the aircraft's 
> flight trajectory.
> 
> I just tried using them, having not used them for a while, and found 
> that about half of the submodel instances are rolling over and 
> spinning around.
> 
> The problem seems to be random and about 50-50, with no obvious 
> pattern between instances that behave properly and those that 
> rotate and spin.
> 
> As they're all created from the same config I'm at a bit of a loss 
> as to how to fix it.
> 
> I noticed that the README.submodels doc doesn't include a definition 
> for the <aero-stabilised> tag but it is used in one of the 
> examples.  I've always used this tag as a bool i.e. 'true/false', 
> like the <wind> tag, but in the examples the <aero-stablised> value 
> is '0' whereas the <wind> tag values are either 'true' or 'false'.  
> Is '0' used in <aero-stabilised> to represent a bool or is it now a 
> numeric value?
> 

In theory nothing has been changed in submodels in a long time, and
<aero-stabilised> remains a bool. However I have been making changes in
AIBallistic, so the problem probably lies there, and I'm investigating. I
can sort of reproduce your bug, but here all the submodels behave in the
same way. If they don't then it is possible that you haven't enabled AI
Models.

Vivian



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