[SOLVED] indices of ROI in python scene

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  • 7 April 2020 at 08:33 #15657
    Simon
    Member

    Hi,

    in my .pyscn I want to get the list of indices found in my ROI. In the sofa gui everything works perfectly fine. Doubleclicking on my boxROI, I can see the ROI is working and the found points/indices are listed. Also the following FixedConstraint with @box_roi_fix.indices is working fine.

    But I want to get the list of indices by using findData('indices').value to further work on those indices in my python code. printing stuff out shows me I don’t get the indices.
    What am I doing wrong? findData('name').value works? Accessing via box.indices is giving me the same problem

    def createScene(rootNode):
		rootNode.createObject('VisualStyle', displayFlags = "showBehavior")
		print dir(rootNode.VisualStyle.displayFlags)
		rootNode.createObject('MechanicalObject', name="dofs", position="0 0 0 0 0 1 0 10 10 10 10 10", showObject="true", showObjectScale="5")
		box = rootNode.createObject('BoxROI',template="Vec3d", name='box_roi_fix',box=[-1, -16, -11,  1, 16, 11], drawBoxes='True', drawSize="1")

		# print type(rootNode.getObject('box_roi_fix').findData('indices'))
		# print dir(rootNode.getObject('box_roi_fix').findData('indices'))
		print (rootNode.getObject('box_roi_fix').findData('name').value)
		print (rootNode.getObject('box_roi_fix').findData('indices').value)
		print (rootNode.getObject('box_roi_fix').findData('nbIndices').value)
		print box.name
		print box.indices

		rootNode.createObject('FixedConstraint', template="Vec3d" ,name="testROIindices", indices="@box_roi_fix.indices", showObject="True", drawSize="0.3")

		return rootNode

    Thanks in advance
    Simon

    7 April 2020 at 08:40 #15659
    Hugo
    Keymaster

    Hi @simon

    This is due to the fact you are calling the data before it is actually initialized.

    The createScene() function is called before initialization to define what components are inside the graph. Then, initialization occurs and the simulation can be run.

    If you call the same findData('indices').value or box.indices in the function onBeginAnimationStep() it will work fine.

    Best wishes,

    Hugo

    7 April 2020 at 08:52 #15660
    Simon
    Member

    Thanks @Hugo,

    I understand. But if I need the the list of indices in the creation of my scene how can I do this?
    Is there something possible like:
    – createScene() (until I need initialization)
    – initialize()
    – continue with createScene() ?

    7 April 2020 at 09:04 #15661
    Simon
    Member

    I could think off 2 .pyscn files:

    1st .pyscn
    -create part of my scne with the roi
    -initialize it
    -animate for on time step
    -get my indices, save them somehow

    2nd .pyscn
    -import indices somehow
    -continue/finish my createscene process

    Or is there already some more clever approach to this?

    7 April 2020 at 09:05 #15662
    Hugo
    Keymaster

    Hi @simon

    Do it in the bwdInitGraph() Python function within the same file.
    FYI all Python functions are displayed in the applications/plugins/SofaPython/examples/EmptyController.py example

    Best wishes,

    Hugo

    7 April 2020 at 09:20 #15663
    Simon
    Member

    Thanks a lot @Hugo

    5 May 2021 at 12:32 #19359
    Arya
    Blocked

    Hey @hugo, I am having an issue with using boxROI indices in the Rigidify function of STLIB/physics/mixedmaterial. I am trying to rigidify a certain part of my deformable body using this rigidify function and I am using boxROI to insert indices into groupIndices of the rigidify function. Although I am not able to extract indices values from boxROI, I am doing this in python and have tried to get indices using the following forms and all of them give seperate errors :

    groupIndices = [“@boxROI.indices”]
    groupIndices = [eobject.getObject(‘boxROI’).findData(‘indices’).value]
    groupIndices = [“@”+BoxROI2.getPathName()+’.indices’]
    groupIndices = [np.array(eobject.getObject(‘boxROI’).findData(‘indices’).value)]

    I tried to print the values of the indices in the onBeginAnimationStep() but I don’t get any output and when I print them in my deformable body class, I get an output of : [[0]]

    Also on using the rigidify function with the groupIndices as the above I get errors like :
    “TypeError: ‘in <string>’ requires string as left operand, not int
    File “rigidifywakrabot.pyscn”, line 92, in createScene
    Wakraedge(rootNode, translation=[1.0, 0.0, 0.0])
    File “rigidifywakrabot.pyscn”, line 73, in Wakraedge
    Rigidify(wakraedge, eobject, groupIndices = [“@”+BoxROI2.getPathName()+’.indices’], frames=None, name=”rigidbody”, frameOrientation=None)
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 86, in Rigidify
    selectedPoints = mfilter(groupIndices[i], allIndices, sourcePoints)
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 78, in mfilter
    if i in si:
    ” ;

    “TypeError: unhashable type: ‘list’
    File “rigidifywakrabot.pyscn”, line 91, in createScene
    Wakraedge(rootNode, translation=[1.0, 0.0, 0.0])
    File “rigidifywakrabot.pyscn”, line 73, in Wakraedge
    Rigidify(wakraedge, eobject, groupIndices = [eobject.getObject(‘boxROI2’).findData(‘indices’).value], frames=None, name=”rigidbody”, frameOrientation=None)
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 111, in Rigidify
    Kd.update({v: [1, k] for k, v in enumerate(selectedIndices)})
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 111, in <dictcomp>
    Kd.update({v: [1, k] for k, v in enumerate(selectedIndices)})
    “;

    “TypeError: unhashable type: ‘numpy.ndarray’
    File “rigidifywakrabot.pyscn”, line 92, in createScene
    Wakraedge(rootNode, translation=[1.0, 0.0, 0.0])
    File “rigidifywakrabot.pyscn”, line 74, in Wakraedge
    Rigidify(wakraedge, eobject, groupIndices = np.array([np.array(eobject.getObject(‘boxROI2’).findData(‘indices’).value)]), frames=None, name=”rigidbody”, frameOrientation=None)
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 111, in Rigidify
    Kd.update({v: [1, k] for k, v in enumerate(selectedIndices)})
    File “/home/aryak/Downloads/SOFA_v19.06.99_custom_Linux_v5.1/plugins/STLIB/python/stlib/physics/mixedmaterial/rigidification.py”, line 111, in <dictcomp>
    Kd.update({v: [1, k] for k, v in enumerate(selectedIndices)})
    “

    17 June 2021 at 16:48 #19745
    chiarasapo
    Blocked

    Hi @aryakarani, I have the same problem: I obtain an empty array when trying to retrieve the boxROI indices from the onBeginAnimationStep function. Did you find a solution? If so, I’d be glad to hear it! Thank you in advance,
    Chiara

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