[SOLVED] no "createScene" nor "createSceneAndController" module method found error

[Zahra]

Hello,

I am trying the “python-scripting” instructions in the documentation. I test the plugin using the fontain example as in “runSofa applications/plugins/SofaPython/examples/fontain.scn” and it works fine. Now I have many questions and I would appreciate your guidance:

1. regarding the “write your python script” section, would you please explain what does the next line mean and what should I do with that(?):

** style=”text-decoration: underline;”>In your scene**

2. In order to translate a scene in a python script, I have followed based on the instructions in the documentation. The .scn file is successfully translated into .py but when I try to use –argv, it says “Unknown option: –argv” and then I receive this error:
[ERROR] [SofaPython] cannot create Scene, no “createScene(rootNode)” nor “createSceneAndController(rootNode)” module method found.

For more clarity, I am adding the commands I applied in the terminal in below:

/home/zahra/sofa/Sofa17.06/src/applications/plugins/SofaPython/scn2python.py /home/zahra/PhD/python//testpythonsofa/caduceus.scn

Input Scene: /home/zahra/PhD/python//testpythonsofa/caduceus.scn, replace node: None, output: /home/zahra/PhD/python//testpythonsofa/caduceusPython, produce .scn and .py: True

zahra@zahra-System-Product-Name:~$ /home/zahra/sofa/Sofa17.06/build/bin/runSofa /home/zahra/PhD/python/testpythonsofa/caduceusPython.py –argv “VariableName” valueNumber valueString

Unknown option: –argv
[INFO] [SofaPython] Added ‘/home/zahra/sofa/Sofa17.06/src/applications/plugins/SofaPython/python’ to sys.path
[INFO] [SofaPython] Added ‘/home/zahra/sofa/Sofa17.06/src/applications/plugins/SofaTest/python’ to sys.path
[INFO] [PluginManager] Loaded plugin: /home/zahra/sofa/Sofa17.06/build/lib/libSofaPython.so

[ERROR] [SofaPython] cannot create Scene, no “createScene(rootNode)” nor “createSceneAndController(rootNode)” module method found.

Best,

Zahra

[Noura]

Hi Zahra,

Regarding your first question, that line is not important, it’s just an html foramt error which should underline the phrase “In your scene”.
In your scene, if you want to use Python …

For your second question:
First of all try to test your scene without arguments, run:
zahra@zahra-System-Product-Name:~$ /home/zahra/sofa/Sofa17.06/build/bin/runSofa /home/zahra/PhD/python/testpythonsofa/caduceusPython.py
If it works fine, now we come to the next issue: it looks like you are using a wrong character before the argv ‘–’, make sure that it is the minus sign ‘-‘ and you also missed an additional one, try to run:
zahra@zahra-System-Product-Name:~$ /home/zahra/sofa/Sofa17.06/build/bin/runSofa /home/zahra/PhD/python/testpythonsofa/caduceusPython.py --argv “VariableName” valueNumber valueString
this should work fine in case the previous works.
Afterwards, I’m not sure what are you doing with these parameters, if your objective is just to follow the tutorial, so the idea here is that you can pass some variables to your simulation directly when you start your simulation, for example:
runSofa caduceusPython.py --argv “material_stiffness” 5000 rubber
Then you can read these values directly in your python code as explained in the tutorial, For example while you create the scene graph:

    def createGraph(self,rootNode):
	variableName = self.commandLineArguments[1] # Get the name of the varible material_stiffness"
	valueString = self.commandLineArguments[3]  # Get the string value "rubber"
        # rootNode
        rootNode.createObject('VisualStyle', displayFlags='showVisual  ')

So far, you will get “material_stiffness” in the variableName and “rubber” in the valueString. You may then use these variables in the python script.

Hope this helps!

Noura

[Hugo]

Hi Zahra, Hi Noura,

Noura is correct it was a html/markdown format issue. It is fixed. Thanks for noticing us.

Regarding the script, again Noura is correct.
Why not simply run the script and then run runSofa caduceusPython.py
This should run fine.

Best

Hugo

[Zahra]

Dear Noura,

Thank you for your guidance. As you mentioned, I am running this:
/home/zahra/sofa/Sofa17.06/build/bin/runSofa /home/zahra/sofa/Sofa17.06/src/examples/Demos/caduceusPython.py

and I am getting this error:

cannot create Scene, no "createScene(rootNode)" nor "createSceneAndController(rootNode)" module method found.

I can not find what is the problem. I appreciate your help.
I tried to copy the caduceusPython.py here, but then your system considers my message as a spam.

[Zahra]

Dear Hugo,

You have mentioned that “simply run the script and then run runSofa caduceusPython.py”, I am so sorry but I am really confused: Which script I should run before ‘runSofa caduceusPython.py’?

[Hugo]

HI Zahra,

I was referring to the scn2python script to apply on the caduceus.scn file in order to get the caduceusPython.py
Best

Hugo

[Zahra]

Hi,

I am applying scn2python on my scenes and it translates correctly to a python script. But when I try to run it by runSofa, I get this error:

cannot create Scene, no “createScene(rootNode)” nor “createSceneAndController(rootNode)” module method found.

How can I run sofa in debug mode in Ubuntu to see at what line I got this error?

Best,

Zahra

[Hugo]

Hey @zahra

Could you share with us the generated python file?
What version of SOFA are you using?
Source or binaries?

Cheers,

Hugo

[Zahra]

Hi @Hugo,

– I am using the stable version SOFA 17.06, and this is my generated python file:

https://gist.github.com/zbounik/b0043c19b817db11df45419c77afd645

Best,

Zahra

[Hugo]

Hi Zahra

Indeed I can reproduce the problem.
Just after import Sofa you can add:

def createScene(rootNode):
    rootNode.createObject('RequiredPlugin', name='SofaPython')
    mySimulation = Ttest(rootNode,[])
    return 0;

and define all your scene in the initGraph function instead of the createGraph function.

Resulting in:

"""
TtestPython
is based on the scene 
/home/zahra/sofa/Work/test/Ttest.scn
but it uses the SofaPython plugin. 
Further informations on the usage of the plugin can be found in 
sofa/applications/plugins/SofaPython/doc/SofaPython.pdf
To lance the scene, type 
runSofa /home/zahra/sofa/Work/test/TtestPython.scn

The current file has been written by the python script
/home/zahra/sofa/Sofa17.06/src/applications/plugins/SofaPython/scn2python.py
Author of scn2python.py: Christoph PAULUS, christoph.paulus@inria.fr
"""

import Sofa

def createScene(rootNode):
    rootNode.createObject('RequiredPlugin', name='SofaPython')
    mySimulation = Ttest(rootNode,[])
    return 0;

class Ttest (Sofa.PythonScriptController):

    def initGraph(self,rootNode):

        # rootNode
        rootNode.createObject('DefaultPipeline', name='CollisionPipeline', verbose='0')
        rootNode.createObject('BruteForceDetection', name='N2')
        rootNode.createObject('DefaultContactManager', name='collision response', response='default')
        rootNode.createObject('DiscreteIntersection', name='discreteIntersection1')

        # rootNode/Liver
        Liver = rootNode.createChild('Liver')
        Liver.depend = 'topo dofs'
        Liver.createObject('EulerImplicitSolver', name='cg_odesolver', printLog='0')
        Liver.createObject('CGLinearSolver', threshold='1e-09', tolerance='1e-09', name='linear solver', iterations='25', template='GraphScattered')
        Liver.createObject('MeshGmshLoader', tetrahedraGroups='  -1 0 38144', name='loader', filename='/home/zahra/sofa/Work/testbygmsh/livertetra7509.msh')
        Liver.createObject('TetrahedronSetTopologyContainer', triangles='@loader.triangles', position='@loader.position', edges='@loader.edges', name='topo', tetrahedra='@loader.tetras')
        Liver.createObject('MechanicalObject', force='0 0 0', name='dofs', template='Vec3d', position='@loader.position', velocity='0 0 0', externalForce='0 0 0', restScale='1')
        Liver.createObject('TetrahedronSetGeometryAlgorithms', drawColorEdges='0.4 1 0.298039 1', showIndicesScale='0.01', name='GeomAlgo', showPointIndices='0', template='Vec3d')
        Liver.createObject('DiagonalMass', massDensity='1', name='computed using mass density', template='Vec3d')
        Liver.createObject('TetrahedralCorotationalFEMForceField', poissonRatio='0.3', name='FEM', computeGlobalMatrix='0', method='large', template='Vec3d', youngModulus='12000')
        Liver.createObject('PlaneForceField', name='planeFF0', template='Vec3d', normal='0 1 0')
        Liver.createObject('ConstantForceField', indices='111', name='constantFF0', template='Vec3d', forces='0 -120 0')
        Liver.createObject('FixedConstraint', indices='11 17 16 15 14 4 3 0 45 95 42 40 38 39 53 62 61 60 4 63 59 125 24 20 19 9', drawSize='0', name='fixedConstraint0', template='Vec3d')
        Liver.createObject('MeshExporter', exportEveryNumberOfSteps='1', quads='0', name='meshExporter3', format='gmsh', exportAtEnd='1', filename='/home/zahra/sofa/Work/Exported/Fine/LiverFine_111_0_-120_0', exportAtBegin='1', hexas='0', edges='0', listening='0', triangles='0')
        Liver.createObject('TetrahedronSetTopologyModifier', name='tetrahedronSetTopologyModifier9')
        Liver.createObject('TetrahedronSetTopologyAlgorithms', name='tetrahedronSetTopologyAlgorithms10', template='Vec3d')

        # rootNode/Liver/Visu-fine
        Visu_fine = Liver.createChild('Visu-fine')
        Visu_fine.createObject('OglModel', sfactor='GL_SRC_ALPHA', blendEquation='GL_FUNC_ADD', name='oglModel0', template='ExtVec3f', dfactor='GL_ONE_MINUS_SRC_ALPHA', material='Default Diffuse 1 0.666667 0 0 1 Ambient 1 0.2 0.2 0.2 1 Specular 0 1 1 1 1 Emissive 0 0 0 0 0 Shininess 0 45 ', primitiveType='DEFAULT')
        Visu_fine.createObject('IdentityMapping', input='@../', name='identityMap1', template='Vec3d,ExtVec3f', output='@./')

        # rootNode/Liver/coarse
        coarse = Liver.createChild('coarse')
        coarse.createObject('MeshGmshLoader', tetrahedraGroups='  -1 0 596', name='meshGmshLoader1', filename='/home/zahra/sofa/Work/testbygmsh/livertetra181.gmsh')
        coarse.createObject('TetrahedronSetTopologyContainer', triangles='@meshGmshLoader1.triangles', position='@meshGmshLoader1.position', edges='@meshGmshLoader1.edges', name='tetrahedronSetTopologyContainer2', tetrahedra='@meshGmshLoader1.tetras')
        coarse.createObject('MechanicalObject', force='0 0 0', name='mObject0', template='Vec3d', position='@meshGmshLoader1.position', velocity='0 0 0', externalForce='0 0 0', restScale='1')
        coarse.createObject('TetrahedronSetTopologyModifier', name='tetrahedronSetTopologyModifier3')
        coarse.createObject('TetrahedronSetGeometryAlgorithms', drawColorEdges='0.4 1 0.298039 1', recomputeTrianglesOrientation='0', name='tetrahedronSetGeometryAlgorithms0', showPointIndices='1', flipNormals='1', showIndicesScale='0.01', template='Vec3d')
        coarse.createObject('TetrahedronSetTopologyAlgorithms', name='tetrahedronSetTopologyAlgorithms1', template='Vec3d')
        coarse.createObject('MeshExporter', exportEveryNumberOfSteps='1', quads='0', name='meshExporter13', format='gmsh', exportAtEnd='1', filename='/home/zahra/sofa/Work/Exported/Coarse/LiverCoarse_111_0_-120_0', exportAtBegin='1', hexas='0', edges='0', listening='0', triangles='0')
        coarse.createObject('EulerImplicitSolver', name='eulerImplicitSolver0')
        coarse.createObject('CGLinearSolver', name='cGLinearSolver1', template='GraphScattered')
        coarse.createObject('DiagonalMass', name='diagonalMass2', template='Vec3d')
        coarse.createObject('FixedConstraint', indices='0', name='fixedConstraint3', template='Vec3d')
        coarse.createObject('PlaneForceField', name='planeFF4', template='Vec3d', normal='0 1 0')
        coarse.createObject('TetrahedralCorotationalFEMForceField', youngModulus='12000', name='tetrahedralCorotationalFEMFF5', poissonRatio='0.3', template='Vec3d')

        # rootNode/Liver/coarse/Visu-coarse
        Visu_coarse = coarse.createChild('Visu-coarse')
        Visu_coarse.createObject('OglModel', sfactor='GL_SRC_ALPHA', name='oglModel1', material='Default Diffuse 1 0 0 1 1 Ambient 1 0 0 0.2 1 Specular 0 0 0 1 1 Emissive 0 0 0 1 1 Shininess 0 45 ', primitiveType='DEFAULT', template='ExtVec3f', translation='0 0 0', dfactor='GL_ONE_MINUS_SRC_ALPHA', blendEquation='GL_FUNC_ADD')
        Visu_coarse.createObject('IdentityMapping', input='@../', name='identityMap2', template='Vec3d,ExtVec3f', output='@./')

        return 0;

    def onKeyPressed(self, c):
        return 0;

    def onKeyReleased(self, c):
        return 0;

    def onLoaded(self, node):
        return 0;

    def onMouseButtonLeft(self, mouseX,mouseY,isPressed):
        return 0;

    def onMouseButtonRight(self, mouseX,mouseY,isPressed):
        return 0;

    def onMouseButtonMiddle(self, mouseX,mouseY,isPressed):
        return 0;

    def onMouseWheel(self, mouseX,mouseY,wheelDelta):
        return 0;

    def onGUIEvent(self, strControlID,valueName,strValue):
        return 0;

    def onBeginAnimationStep(self, deltaTime):
        return 0;

    def onEndAnimationStep(self, deltaTime):
        return 0;

    def onScriptEvent(self, senderNode, eventName,data):
        return 0;

    def bwdInitGraph(self, node):
        return 0;

    def storeResetState(self):
        return 0;

    def reset(self):
        return 0;

    def cleanup(self):
        return 0;

Best

Hugo

[Zahra]

WOW! It is working now! Thank you so much dear @Hugo for your explanation, I am learning python scripting better now.

Cheers,

Zahra

[Author]

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