dene maxwell > > >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 >
Once you get them running, pass them to me, and I'll look at them with a view to putting them into CVS. V. _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
