>From: "Vivian Meazza" <[EMAIL PROTECTED]>
>
>dene maxwell
>
> >
> >
> > >From: Josh Babcock <[EMAIL PROTECTED]>
> > >
> > >dene maxwell wrote:
> > > > Hi
> > > > I'm trying to get an xml animation going for AI taildraggers, as the
> > AI
> > >FDM
> > > > doesn't seem to cater for this. I have copied the rotate animation
> > >example
> > > > from the Model-HowTo;
> > > >
> > > > <!-- ***** TailDragger ***** -->
> > > > <animation>
> > > > <type>rotate</type>
> > > >
> > ><property>/ai/models/aircraft/velocities/true-airspeed-kt</property>
> > > > <factor>1</factor>
> > > > <offset>1</offset>
> > > > <min>0.0</min>
> > > > <max>13.0</max>
> > > > <center>
> > > > <x-m>2</x-m>
> > > > <y-m>0</y-m>
> > > > <z-m>-1.5</z-m>
> > > > </center>
> > > > <axis>
> > > > <x>0</x>
> > > > <y>1</y>
> > > > <z>0</z>
> > > > </axis>
> > > > <!--
> > > > <condition>
> > > > <less-than>
> > > >
> > ><property>/ai/models/aircraft/velocities/true-airspeed-kt</property>
> > > > <value>30</value>
> > > > </less-than>
> > > > </condition>
> > > > -->
> > > > </animation>
> > > >
> > > > but the min and max values don't have any effect... the plane
>rotates
> > >about
> > > > the wheels as the speed varies...to the extent at 180 knots it's
> > flying
> > > > backwards and upside down ...very amusing first time but now just
> > > > frustrating...
> > > >
> > > > ...what am I doing wrong in this animation?
> > > >
> > > > TIA
> > > > :-D ene
> > > >
> > >
> > >What you have will rise from 0 up to 13 as the airspeed rises from -1
>up
> > >to 12, then stay at 13 as the airspeed keeps on rising. To fix this,
> > >make factor 1/n where n is the airspeed that you want the rotation to
>be
> > >13. You probably also want offset to be 0, but I'm not sure exactly
>what
> > >you are doing. Think of it as a graph of Y=aX+b Y is your rotation, X
>is
> > >the airspeed, b is the offset, and a is the factor. It might help to
> > >actually draw the graph.
> > >
> > >Josh
> > >
> > Oh ...I know the factors are all wrong at the moment, but the problem is
> > the
> > min and max aren't limiting the degree of moment... I would be quite
>happy
> > at this stage to get the tail up @0ktas then falling at a predetermined
> > level but at the moment there are no limits on the rotation despite the
> > min
> > and max
> >
> > I know that factor will determine the gradient of the transition, what I
> > want is (typical taildragger behaviour) at a predetermined speed (say
> > 50knts) the tail to rise (assuming acceleration) to normal flying
>attitude
> > (ie 0 degrees).... the x-y graph would look like;
> >
> > Tail
> > Elevation
> > |-----------------Tail down (13*)
> > | \
> > | \
> > | \------------------Tail up (0*)
> > |________+__+_________________
> > Vmin Vmax
> > Velocity->
> >
> > but I need the min/max to work for this....
> >
>
>I've just looked at the source code, and the rotation animation does not
>recognise "max/min" you need "max-deg/min-deg". "starting-position-deg" is
>also available
>
>You could also use interpolation to do the same thing
>
>Vivian
>
>
Aahhh, thanks Vivian, will experiment with that tomorrow... I will make a
note of that...I'm getting a few notes on irregularities in the Model-HowTo
document, I will make those available to anybody that would like to update
CVS for me or at least point me in the right direction so I can update
CVS...
Would the AI Animation xml files I produce also be useful for CVS? eg
[aircraft]-AI-Model.xml
:-D ene
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