I regularly fly my drone over an area with multiple stockpiles.
At the moment it seems the only way to calculate a volume is to select the pile, delete everything else, fill holes etc etc then get a volume.
Then reload original mesh, and do it all again for next stockpile.
Most other software solutions allow a simple polygon to be drawn around the base of a pile which becomes a temporary ground plane and then calculates everything above or below to give a quick and easy volume without tedious 3d model cleaning.
