Re: [simspark-devel] ODEImps Plugin

[Hedayat V. <hed...@ai...>]

Hi Andreas!

On ۱۰/۰۲/۲۲  10:49, ah...@un... wrote:
> Hi,
>
>
> I am now one step closer to having the ODE classes as a plugin. I use the
> PhysicsServer for testing for now, because this is a class that is
> actually used, as opposed to the AngularMotor, and thus obviously more
> suited for testing. PhysicsServerImp now shows up in the scenegraph; the
> key was to build odeimps not as a library, but as a module (which is the
> desired method anyway, as building it as a library was merely a
> workaround).
>
> I changed spark.rb a bit so that it imports the odeimps bundle at the very
> beginning. The relevant part now looks like this:
>
> ----- begin excerpt from spark.rb -----
> #
> # setup spark
> #
>
> print "(spark.rb) setup\n"
>
> #import the implementations of the desired physics engine
> #currently supported: odeimps (uses Open Dynamics Engine)
> importBundle "odeimps"
> print "(spark.rb) using ODE, to change the physics engine go to line 559
> in spark.rb\n"
>
> #
> # set up logging
> logServer = get($serverPath+'log')
>
> if (logServer != nil)
>    logServer.addStream(':cerr', 'eError')
> end
>
>
> #
> # setup the PhysicsServer
> sparkGetPhysicsServer()
> ----- end excerpt from spark.rb -----
>
> Here's a screenshot of rsgedit which proves that the odeimps bundle gets
> imported correctly, and also showcases that the PhysicsServerImp shows up
> at "/classes/PhysicsServerImp":
>
> http://www.uni-koblenz.de/~aheld/rsgeditscreen.png
>
> Since I can now be 100% sure that PhysicsServerImp is now registered at
> /classes/PhysicsServerImp _before_ the PhysicsServer is set up [as
> importbundle"odeimps" is called prior to sparkGetPhysicsServer()], I can
> now instanciate mPhysicsServerImp in the PhysicsServer's OnLink method
> like this:
>
> void PhysicsServer::OnLink(){
>      mPhysicsServerImp = shared_dynamic_cast<PhysicsServerInt>
>          (GetCore()->New("/classes/PhysicsServerImp"));
> }
>
> This leads to the following console output:
>
> ----- begin inexplicable console output ----
> (ScriptServer) Script ended OK /home/andreas/.simspark/kerosin.rb
> (ScriptServer) Running /usr/local/share/simspark//spark.rb...
> (spark.rb) setup
> (spark.rb) using ODE, to change the physics engine go to line 558 in spark.rb
> (Core::New) unkown class '/classes/PhysicsServerImp'
> (GeometryServer) MeshImporter 'oxygen/StdMeshImporter' registered
> ----- end inexplicable console output -----
>
> As even a trained monkey could see, the odeimps bundle is imported, and
> thus PhysicsServerImp registered at /classes/PhysicsServerImp immediately
> before Zeitgeist complains that PhysicsServerImp is not registered at
> /classes/PhysicsServerImp. The RSGEdit screenshot proves that
> PhysicsServerImp is registered at /classes/PhysicsServerImp.
>
> Soemhow the PhysicsServer is set up before PhysicsServerImp is registered
> even though spark.rb registers PhysicsServerImp before the PhysicsServer
> is set up. This is a time paradoxon. Maybe I'm using a quantum computer
> without knowing it?
>
> Any ideas would be appreciated.
>    
IMHO, you should simply use

GetCore()->New("PhysicsServerImp")

Instead of

GetCore()->New("/classes/PhysicsServerImp")

And it should work fine!

Good luck,
Hedayat
>
> thanks,
>
> Andreas
>
>
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