Volume of a body in Mechanical

Indrajit

Hello,

I am trying to get the volume of individual bodies in a Geometry assembly.

ExtAPI.DataModel.Project.Model.Geometry.Volume gave me the total volume of the model.

How should I get the volume of individual ones

Thanks,

Indrajit

Indrajit

The following works

entity = ExtAPI.DataModel.GeoData.GeoEntityById(sel.Ids[i])

Volume = entity.Volume

Thanks!

Pernelle Marone-Hitz

Hi @Indrajit , happy to see you on the forum and thanks for sharing your knowledge! There's two ways you can retrieve that information.

As it is some information that is shown in the details view of the "tree geometry" for each body:

You can use the Model API to get that info:

bodies = Model.Geometry.GetChildren(DataModelObjectCategory.Body, True)
for body in bodies:
    print('Body volume is: ' + str(body.Volume))

This returns:

Another method is to use GeoData to retrieve that information:

bodies = Model.Geometry.GetChildren(DataModelObjectCategory.Body, True)
for body in bodies:
    geobody = body.GetGeoBody()
    print('Body volume is: ' + str(geobody.Volume))

This returns:

For an explanation of the difference between a body as seen from the Mechanical tree and as seen from Geodata, please refer to this post:

https://discuss.ansys.com/discussion/2288/whats-the-difference-between-tree-geometry-and-geodata-in-mechanical-api/p1?new=1

Indrajit

Hi Pernelle,

Thanks a lot.

Lots of options to select from.

Is there a Python command manual for Spaceclaim?

Pernelle Marone-Hitz

Hi @Indrajit , sorry for the late answer, I am back in the office just today.

You can find a Developers Guide in the SpaceClaim installation files. If you're using a standard installation path, for 2023R1 this would be: C:\Program Files\ANSYS Inc\v231\scdm\SpaceClaim.Api.V23.

M

If you wanted to write the body data to file, you could use this script:

import os

save_directory = 'D:\\temp'
save_file = 'body_data.csv'

bodies = Model.Geometry.GetChildren(DataModelObjectCategory.Body, True)

data = [] # result will be stored in the parameter 'data'

for body in bodies:
    name = body.Name
    volume = body.Volume.Value #.Value for numeric results without units, !always be sure of your units
    mass = body.Mass.Value
    material = body.Material # Name of material
    data.append([name,material,volume,mass])

with open(os.path.join(save_directory,save_file),'w') as f: # 'w' is to write to file
    for line in data:
        for data_point in line:
            f.write(str(data_point) + ',')
        f.write('\n')