Hi,

perhaps you could start with a tutorial by Peter Fritzson:
https://www.openmodelica.org/images/doc … itzson.pdf

For visualization follow the steps in: https://build.openmodelica.org/Document … ica3D.html
If you use OMEdit, simply add ModelicaServices of version "3.2.1 modelica3d" to the list of libraries to load on startup.

so long.
Willi

Hi,

Thanks for suggesting the tutorial. I have already gone through it and it does not give a proper idea on how to create systems. What I mean to say is it tells how to create 2-3 systems. I need to understand how to create systems in a generic way.

About the animations part. I did not understand what the link said. (I work on a windows system). I have installed OpenModelica 1.9.1+dev (r18473) (RML version). A nightly build. It has only Connection editor, Notebook, Optimization Editor and the shell. Is that all that is required or should i install anything else as well?

Also, I could not find the dbus-server.py file. Where is it located. And what do you mean by a session?

Read OpenModelica users guide. It is part of OpenModelica installation and is located at C:\OpenModelica1.9.1Nightly\share\doc\omc\OpenModelicaUsersGuide.pdf (assuming that you installed OpenModelica at the default location).

In particular read chapter 1 for general understanding and read chapter 11 for Modelica3D.

I checked the dbus-server.py and yes it is missing. It seems like something is wrong in the build. I will look into it.

Adeel.

The dbus-server.py should be available now. Adrian has fixed it in r18663.

Adeel.

Thanks adeas.

I'll download the latest version and check it out.

Wbraun had given a link for finding instructions on the visualization part which had a link to the Modelica3d Wiki page
(https://mlcontrol.uebb.tu-berlin.de/red … lic/wiki).
This page had a few video clips on Modelica3Dehich now have been removed and do not exist anymore. Any idea if those exist on some other page or website?

Thanks and Regards,
Sanjay_Kamath

Hi,
I've installed python and pyGtk as per the instructions in the user guide. Now, when i run the dbus-server.py, I get the following error in the command prompt.

Traceback (most recent call last):
  File "D:\\OpenModelica1.9.1Nightly\\lib\\omlibrary-modelica3d\\osg-gtk\\dbus-s
erver.py", line 17, in <module>
    viewer = CDLL("libm3d-osg-gtk.dll")  # GTK/OSG backend
  File "C:\Python27\lib\ctypes\__init__.py", line 365, in __init__
    self._handle = _dlopen(self._name, mode)
WindowsError: [Error 126] The specified module could not be found

What is the solution for this?

Copy that dll around to every single directory on your system so it can be found. That usually works for Windows

Or use Linux; works flawlessly there.

You mean copy the libm3d-osg-gtk.dll to each and every folder in the openmodelica installation directory right?

Isn't it python that needs it? I don't think OpenModelica needs it...

so copy the libm3d-osg-gtk.dll to every folder in the python directory?

Maybe. I don't have any Windows machine to test it on

How do you start dbus-server.py? The libm3d-osg-gtk.dll is located in the same directory where dbus-server.py is.
I need to know how you run your python script?
If you just cd to the directory and run,

python dbus-server.py

it should work.

Adeel.

I have OpenModelica installed in D:\
So i enter the command prompt and type
python "D:\\OpenModelica1.9.1Nightly\\lib\\omlibrary-modelica3d\\osg-gtk\\dbus-server.py"


Even if i do
cd D:\OpenModelica1.9.1Nightly\lib\omlibrary-modelica3d\osg-gtk6
and then type
python dbus-server.py

still gives me the same error

You should do,

cd "D:\\OpenModelica1.9.1Nightly\\lib\\omlibrary-modelica3d\\osg-gtk"

python dbus-server.py

In this way your working directory is "osg-gtk" and then python can find the dll.

Adeel.

Did that.. Still the same error. I'm reinstalling OpenModelica in the default directory. I'll check it out again and let you know.

Am I using  the correct versions of the following softwares?

I'm using python 2.7.3 64 bit.

I couldnt find the 64 bit version of  pygtk-all-in-one-2.24.2.win32-py2.7.msi. So I'm using gtk+-bundle_2.22.1-20101229_win64

I don't think reinstalling OpenModelica will help.

You should probably try with 32 bit Python and pygtk-all-in-one-2.24.2.win32-py2.7.msi

Adeel.

I've installed in the default directory. This is what i get in the command prompt now.

C:\OpenModelica1.9.1Nightly\lib\omlibrary-modelica3d\osg-gtk>python dbus-server.
py
Traceback (most recent call last):
  File "dbus-server.py", line 9, in <module>
    omhome = os.environ['OPENMODELICAHOME']
  File "C:\Python27\lib\os.py", line 423, in __getitem__
    return self.data[key.upper()]
KeyError: 'OPENMODELICAHOME'

Check your OPENMODELICAHOME environment variable.

Adeel.

It is set to C:\OpenModelica1.9.1Nightly\

Is that right?

Yes, that is right. I don't know why then python says,

File "C:\Python27\lib\os.py", line 423, in __getitem__
    return self.data[key.upper()]
KeyError: 'OPENMODELICAHOME'

As I said try with 32 bit version of python and pygtk.

Adeel.

I installed the 32bit versions. Finally.. dbus server ran successfully. But now there's a new problem

I opened OMShell, typed
loadModelica3D()

It returned:
true

I typed

simulate(Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum,stopTime=30)

It gave me

record SimulationResult
    resultFile = "",
    simulationOptions = "startTime = 0.0, stopTime = 30.0, numberOfIntervals = 500, tolerance = 1e-006, method = 'dassl', fileNamePrefix = 'Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum', options = '', outputFormat = 'mat', variableFilter = '.*', measureTime = false, cflags = '', simflags = ''",
    messages = "Simulation execution failed for model: Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum
",
    timeFrontend = 2.29278456477762,
    timeBackend = 0.9708275990830332,
    timeSimCode = 0.5450928611711536,
    timeTemplates = 1.209451456002341,
    timeCompile = 12.70178292678702
end SimulationResult;
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.x_label.cylinders[1].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.x_label.cylinders[2].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.y_label.cylinders[1].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.y_label.cylinders[2].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.z_label.cylinders[1].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.z_label.cylinders[2].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.z_label.cylinders[3].m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.x_arrowLine.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.x_arrowHead.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.y_arrowLine.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.y_arrowHead.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.z_arrowLine.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.z_arrowHead.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.gravityArrowLine.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller world.gravityArrowHead.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Mechanics.MultiBody.Visualizers.Advanced.Shape.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller revolute1.cylinder.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    .Modelica.Mechanics.MultiBody.World world; defined in scope: Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum. Referenced by 'outer' components: {revolute1.world}
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller boxBody1.frameTranslation.shape.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    .Modelica.Mechanics.MultiBody.World world; defined in scope: Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum. Referenced by 'outer' components: {boxBody1.frameTranslation.world, boxBody1.world, revolute1.world}
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller revolute2.cylinder.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    .Modelica.Mechanics.MultiBody.World world; defined in scope: Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum. Referenced by 'outer' components: {revolute2.world, boxBody1.body.world, boxBody1.frameTranslation.world, boxBody1.world, revolute1.world}
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
[C:\OpenModelica1.9.1Nightly\lib\omlibrary\ModelicaServices 3.2.1 modelica3d\Modelica3D\package.mo:507:5-507:33:writable] Warning: No corresponding 'inner' declaration found for component .ModelicaServices.Modelica3D.Controller boxBody2.frameTranslation.shape.m3d_control declared as 'outer '.
  The existing 'inner' components are:
    .Modelica.Mechanics.MultiBody.World world; defined in scope: Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum. Referenced by 'outer' components: {boxBody2.frameTranslation.world, boxBody2.world, revolute2.world, boxBody1.body.world, boxBody1.frameTranslation.world, boxBody1.world, revolute1.world}
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.
Warning: The initial conditions are not fully specified. Use +d=initialization for more information.

Read the rest of the commands used: https://build.openmodelica.org/Document … ica3D.html
(In particular where you need to insert this inner component to make Modelica3D happy)

I think we should update the users guide as it is still the old example code in it.
I will fix it.

Adeel.

Thanks a ton.. Visualization is working now

Great. I have also updated the users guide.

Adeel.

I keep getting this warning most of the times.

Warning: The initial conditions are not fully specified. Use +d=initialization for more information.

What is this?

To visualize other multibody examples, I have to change only the last part in the extends line, right?

Where can I find the updated Users Guide? I dont want to download the entire nightly build again, do I?

https://openmodelica.org/svn/OpenModelica/trunk/doc/

One last question.

For the existing examples, I can give the path through the modelica library. i.e. Modelica.Mechanics.MultiBody.Examples.Elementary.DoublePendulum etc etc in the extends line.

What shall i give for the models that I create?

The path of your models e.g MyPackage.MyNestedPackage.MyModel

Adeel.

How do i find this path?

What do you mean how do you find this path? You know this path since you have created it.

For example if I create the following package,

package p1

  package p2

    package p3

      model m1

      end m1;

    end p3;

  end p2;

end p1;

Now i know the path of model m1 i.e p1.p2.p3.m1

There are API calls to find the class names e.g,

loadString("package p1

  package p2

    package p3

      model m1

      end m1;

    end p3;

  end p2;

end p1;");

getClassNames();

getClassNames(p1);

getClassNames(p1.p2);

getClassNames(p1.p2.p3);

Adeel.

No. I dont create a package as such. I open OMEdit, File>NewModelicaClass, Give a Name, Specialization-Model and start off

I save these .mo files in my local directories (say D:\Temp\sample.mo). How do i access these?

Then the name you give to it, is the path since you don't put it inside any package.
Lets say you name it "SampleModel" then your visualization script will be something like this,

loadFile("D:\Temp\sample.mo");getErrorString();

loadModelica3D();getErrorString();

loadString("model SampleModelVis

  extends SampleModel;

  inner ModelicaServices.Modelica3D.Controller m3d_control;

end SampleModelVis;");getErrorString();

simulate(SampleModelVis);

Note that you need to load your model so that the compiler can find it.

Adeel.

Thanks.