How can I get the total mass of bodies contained in a Named Selection using Scripting in Mechanical?

Tasos

Let's assume I have selected a set of bodies of interest and placed those in a Named Selection (e.g. "MySelection").

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Tasos

You can use the following snippet to:

Access the Named Selection by name (it has to be a unique name to select this way).
Retrieve the reference IDs to the contained bodies.
Get the geometric body objects and convert these to tree objects so you can retrieve the mass property.
Iterate over the bodies in the selection and sum the mass in the selection_mass variable.

'''Starting from a named selection containing only bodies "MySelection" '''

named_selection = DataModel.GetObjectsByName("MySelection")[0]

selection_mass = 0 # Initiating total mass counter


''' Iterating over the body IDs in the named selection and summing the mass of each'''

for bID in named_selection.Location.Ids:

    geobody = ExtAPI.DataModel.GeoData.GeoEntityById(bID)

    # Converting to tree body object to benefit from the available .Mass property

    treebody=ExtAPI.DataModel.Project.Model.Geometry.GetBody(geobody)

    selection_mass = selection_mass + treebody.Mass.Value


'''treebody.Mass will report the mass units as well. You may check the consistency

 of units across your bodies before summing'''

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Tasos

You can use the following snippet to:

Access the Named Selection by name (it has to be a unique name to select this way).
Retrieve the reference IDs to the contained bodies.
Get the geometric body objects and convert these to tree objects so you can retrieve the mass property.
Iterate over the bodies in the selection and sum the mass in the selection_mass variable.

'''Starting from a named selection containing only bodies "MySelection" '''

named_selection = DataModel.GetObjectsByName("MySelection")[0]

selection_mass = 0 # Initiating total mass counter


''' Iterating over the body IDs in the named selection and summing the mass of each'''

for bID in named_selection.Location.Ids:

    geobody = ExtAPI.DataModel.GeoData.GeoEntityById(bID)

    # Converting to tree body object to benefit from the available .Mass property

    treebody=ExtAPI.DataModel.Project.Model.Geometry.GetBody(geobody)

    selection_mass = selection_mass + treebody.Mass.Value


'''treebody.Mass will report the mass units as well. You may check the consistency

 of units across your bodies before summing'''