re: [Plib-users] Animations again....

[David M. <da...@me...>]

SkyFlash writes:

 > Can anyone point me to a good source of information on how to get 3D
 > animations into PLIB and run them?
 > What I tried yet didnt work at all....

For FlightGear, we built animations as a separate layer on top of plib
rather than trying to do anything inside plib.  You specify animations
using XML wrapper files, referencing objects inside a model by name
(that wrapper files can also import submodels into the model);
FlightGear adds a callback and userdata to the scene graph so that the
animation will update automatically when the named branch is
traversed.  Here's an example from the XML wrapper for a Cessna 172P,
to rotate the rudder:

 <animation>
  <type>rotate</type>
  <object-name>Rudder</object-name>
  <property>/surface-positions/rudder-pos-norm</property>
  <factor>17.5</factor>
  <center>
   <x-m>4.84</x-m>
   <y-m>0.0</y-m>
   <z-m>-.16</z-m>
  </center>
  <axis>
   <x>0.25</x>
   <y>0.0</y>
   <z>1.0</z>
  </axis>
 </animation>

"/surface-positions/rudder-pos-norm" refers to an internal property in
FlightGear -- FlightGear publishes all of its state through a property
tree that can be loaded from or saved to XML, or accessed through a
GUI or over the network via HTTP or FTP.


All the best,


David

p.s. Please turn off HTML formatting in your e-mail client -- it adds
a lot of display garbage to your postings.

-- 
David Megginson, da...@me..., http://www.megginson.com/