Extract scalefactors from scaled model

[hans o]

Hello. I am trying to extract scale factors from two models using python to compare them. I can see the scale factors in the osim file, but I am currently failing to read them out for each body part. I am aiming for something like this:

Code: Select all

osimModel = osim.Model(scaledModelFilename)
state = osimModel.initSystem()
nBody = osimModel.getBodySet().getSize() # Number of Bodies
bodyNames = []
scaleFactors = []
# Display scale factors
for i in range(0, nBody):
    ScaleFactor = osim.Vec3(0, 0, 0)
    osimModel.getBodySet().get(i).getScaleFactors(ScaleFactor)
    bodyNames.append(osimModel.getBodySet().get(i).getName())
    scaleFactors.append([ScaleFactor.get(0), ScaleFactor.get(1), ScaleFactor.get(2)])

As far as I know, the class ModelComponent (from which "Body" inherits) implements "getScaleFactors", but it takes a frame and a ScaleSet. I do not really know how to obtain them from a model and its bodyparts. The code above fails with the message "'Body' object has no attribute 'getScaleFactors'". Can anyone help with this?
Thanks alot!

[Bryce Killen]

Hi Hans,

See the below code snippet where I extract the scale factors

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#_#_#_#_#_ Femur 
femScalesOS = femBody.get_attached_geometry(0).get_scale_factors()
femScales=np.ones(3)
for x in range(0,3):
    femScales[x]=femScalesOS.get(x)

Where femBody is a opensim body object

Bryce

[hans o]

Wonderful, it worked! Thank you very much.