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 > > > > > > _________________________________________________________________ > > > Discover fun and games at @ http://xtramsn.co.nz/kids > > > > > > > > > > > > _______________________________________________ > > > Flightgear-users mailing list > > > [email protected] > > > https://lists.sourceforge.net/lists/listinfo/flightgear-users > > > > > > >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 _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
