Sum of all the elements

Greetings. I have a question how to get the sum of all the elements of the array?
I want to see the sum of the areas of all rooms.

The functionality will be added in one of the upcoming version of Viz. In the meanwhile, you can create a compound with the different faces and then measure the area of the compound.

Thank you. This temporary option works =)
I’ll wait for the update.
Thanks again for the very nice plugin.