Missing attribute: getObject

[daserk]

Hello. This sounds like a really basic question, but after many hours of trying I wasn’t able to solve the issue.

In many example codes I see getObject() being used to get some object that is part of a node and examine or work with its data.

For example, using it with a PythonController to control the length of a CableConstraint, or the position or rotation of an object.

But regardless of what I want to do, I always get the error:

[ERROR] [SofaPython3::SceneLoader] AttributeError: Missing attribute: getObject

Which seems very weird to me, as I am clearly doing something wrong.

Even simple python scenes like this one produce the error.

import Sofa

def createScene(root):
    object = root.getObject('defaultAnimationLoop')
    print(object.findData('name').value)

I think I just don’t understand how objects in Python work. Any help will be appreciated.

For reference I am running version 20.04 LTS of PopOS (Ubuntu based) with a compiled stable version of SOFA 21.06 with SofaPython3.

[Hugo]

Hi @daserk

Sorry that you struggled on this point.
Which version of SOFA and SofaPython3 are you using?

The recent PR #171 fixed the node iterator in python3, preventing from doing the getObject as you are trying to do – if I am correct. This was recently merged within the master branch of SofaPython3, and available in the v21.06.01. You should be able to write:

mytoto = root.getObject("Toto")
if mytoto != None:
    copymydata = mytoto.dataname

Could you try with the latest v21.06.01 please?

I hope this helps.
Best wishes,

Hugo

[Thresholddd]

Hi, @Hugo,

I met the same problem using v21.06.01, but getObject() function still not work. I met the error

def createScene(root):
    model = root.addChild("model")
    model.addObject("RegularGridTopology", name = "grid",min = "-5 -5 0", max = "5 5 40", n = "3 3 10")
    print(LRmodel.getObject("grid"))

I run in python, error
[ERROR] [SofaRuntime] AttributeError: Missing attribute: getObject
in runSofa
[ERROR] [SofaPython3::SceneLoader] AttributeError: Missing attribute: getObject

[Hugo]

Hi @daserk

It’s strange. What is LRmodel ? Is it a node ?
The function getObject should work an example here if liver is a node and dofs is an object in this node (a MechanicalObject here):

liver.getObject("dofs").findData("position").value

Best

Hugo

[Eric]

Hi Hugo,

I encountered the error of “Missing attribute getObject” as I was trying to access indices within BoxROI

    tissue = root.addChild('tissue')
    tissue.addObject('EulerImplicitSolver', name = "tissueImplicitSolver", rayleighStiffness = "0.01", printLog = "false")
    tissue.addObject('CGLinearSolver', name = "tissueCgLinearSolver", iterations = "25", tolerance = "1e-09", threshold="1e-09")
    tissue.addObject('MeshGmshLoader', name="tissueMeshLoader", filename=tissue_mesh_model)
    tissue.addObject('TetrahedronSetTopologyContainer', name="tissueMeshTopo", src="@tissueMeshLoader")
    tissue.addObject('MechanicalObject', name = "tissueDofs", src="@tissueMeshLoader")
    tissue.addObject('UniformMass', name = "tissueMass", totalMass = "0.001")
    tissue.addObject('TetrahedronFEMForceField', template = "Vec3d", name = "tissue TetrahedronFEM Forcefield", method="large", poissonRatio="0.35", youngModulus="5000", computeGlobalMatrix="0")
    tissue.addObject('BoxROI', name = "tissueBoxROI",box = "-999 -999 -999 0.001 0.001 0.001")
    tissue_fixed_indices = tissue.getObject('tissueBoxROI').findData('indices').value

However, if I define
tissue_box = tissue.addObject('BoxROI', name = "tissueBoxROI",box = "-999 -999 -999 0.001 0.001 0.001")
and after
tissue.init()
I could access object data through tissue_box.indices but still cannot via tissue.getObject("tissueBoxROI").findData("indices").value

The version I am running is 21.06.02. Wonder what might be the reason for this error.

Cheers

[Hugo]

Dear @ericcui

Indeed since the recent versions of SOFA (v21.06 and more recent) the way to access a data is using tissue_box.indices. The getObject is a deprecated approach.

Best wishes,

Hugo

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