All, Sorry, I answered my own question - I was afraid Field Variables were buried in the "meta" like the Block names were. They were actually a little simpler once I found some time to poke around.
To add Total_Volume as a Field Variable inside programmable filter: ... output.DeepCopy(inputs[0]) Total_Volume = calc_Total_Volume() FieldData=output.FieldData Tot_Vol_Array=zeros( (1,1) ) #this is the part I didn't understand I needed Tot_Vol_Array.fill(Total_Volume) FieldData.append(Tot_Vol_Array, "Total_Volume") False alarm this time, but I'm sure I'll be back! Dennis
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