Hi yakas are you possibly remembering the volume calculation command from here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7421.27

Area.js is from here: http://moi3d.com/forum/index.php?webtag=MOI&msg=7336.1 that also mentions the limitations it works with, single closed curve in the Top view.

- Michael