Hi Jonasz,

I had more success with the following snippet in Python:

# Retrieve object of interest
my_object = TheSystem.NCE.GetObjectAt(1)

# Retrieve scatter data from the relevant face
scatter_data = o11.CoatScatterData.GetFaceData(0)

# Retrieve scatter settings
scatter_settings = scatter_data.CurrentScatterModelSettings._S_Gaussian

# Retrieve sigma parameter
sigma = scatter_settings.Sigma

# Print current sigma
print(sigma)

# Change sigma to a new value
sigma = 1.2345

# Apply new scatter settings
scatter_data.ChangeScatterModelSettings(scatter_settings)

I hope this helps. The main difference is that I used the _S_Gaussian property to sort of cast the settings to the Gaussian scatter model.

Also you need to use the ChangeScatterModelSettings method to actually apply the settings.

Take care,

David