[SOLVED] ERROR in Simulation::animate() while testing

[ErwanDouaille]

Hey,

I’m writing test but i had an error. Here is my source :

        std::stringstream scene1 ;
        scene1 <<
                  "<?xml version='1.0' ?>                                                       \n"
                  "<Node  name='Root' gravity='0 0 0' time='0' animate='0'   >                  \n"
                  "   <MyComponent name='aComponent' />                                         \n"
                  "</Node>                                                                      \n";

        Node::SPtr root = SceneLoaderXML::loadFromMemory ("testscene", scene1.str().c_str(), scene1.str().size()) ;
        root->init(ExecParams::defaultInstance()) ;

        for(unsigned int i=0; i<100; i++)
        {
            sofa::simulation::getSimulation()->animate(root.get(), 0.01);
        }

The result of running it is a warning error :
`[WARNING] [DAGSimulation(Simulation)] ERROR in Simulation::animate(): AnimationLoop expected at the root node’

Did I forget something ? My root scene isn’t correct ?

Thanks for helping 😉

[ErwanDouaille]

up.
I need help 🙂

[Guillaume]

Woaw this has been pending for a way too long time!
I’m on it!

Did you try to reproduce the problem with latest SOFA?

Cheers,
Guillaume.

[ErwanDouaille]

I’m using a recent one maybe not the latest version (2/3 weeks old).
Here is the source code I’m using :

std::stringstream scene1 ;
        scene1 <<
                  "<?xml version='1.0' ?>                                                       \n"
                  "<Node name='root'>                                                           \n"
                  "   <RequiredPlugin name='Communication' />                                   \n"
                  "   <ServerCommunicationZMQ name='zmqSender' job='sender' port='6000' refreshRate='1000'/> \n"
                  "   <CommunicationSubscriber name='sub1' communication='@zmqSender' subject='/test' source='@zmqSender' arguments='x'/>"
                  "</Node>                                                                      \n";

        Node::SPtr root = SceneLoaderXML::loadFromMemory ("testscene", scene1.str().c_str(), scene1.str().size()) ;
        root->init(ExecParams::defaultInstance());

        for(unsigned int i=0; i<100; i++)
        {
            sofa::simulation::getSimulation()->animate(root.get(), 0.01);
        }

And here is the result :

[ RUN ] Communication_testZMQ.checkArgumentCreation
[INFO] [PluginManager] Loaded plugin: /home/douaille/SOFA/build-communication-Desktop_Qt_5_9_2_GCC_64bit-Debug/lib/libCommunication_d.so
[WARNING] [DAGSimulation(Simulation)] ERROR in Simulation::animate(): AnimationLoop expected at the root node
[WARNING] [DAGSimulation(Simulation)] ERROR in Simulation::animate(): AnimationLoop expected at the root node

*100 didn’t copy everything.

Am I doing something wrong ?

[Guillaume]

Ok I searched for all sofa::simulation::getSimulation()->animate calls in tests and it seems that SceneLoaderXML::loadFromMemory does not have any default component creation behavior.

Solution 1: simply add a <DefaultAnimationLoop/> in your graph.
Solution 2: use another scene loading method to profit from default component creation. Using a file and loading it with sofa::simulation::getSimulation()->load does the trick.
Solution 3: implement default component creation in SceneLoaderXML::loadFromMemory.

Hope that helps,
Guillaume.

[ErwanDouaille]

I tested the solution 1 and it works like a charm !

As I understood,

sofa::simulation::getSimulation()->animate(root.get(), 0.01);

may works correctly. But something is not well initialize, right ?

Just trying to understand what is wrong with the animate call.
I will add the solved flag since it works.

Thanks !

[Guillaume]

What happens is that sofa::simulation::getSimulation()->animate needs an AnimationLoop as you can see here.
Usually with XML scenes, a DefaultAnimationLoop (and other components) is added to the simulation if none found. This is not the case when using SceneLoaderXML::loadFromMemory.

Guillaume.

[ErwanDouaille]

Thanks for the explanation.

[Author]

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