Calculate Volume Of 3d Model. Then i extract surface and calculate the volume based on this algorithm. This way you can count the pixels or even larger pixels as pixel groups to get the volume.
But this is not trivial. I calculate volume based on same geometry. This is easily done using.
If you have this you just sum up the volumes of all tetrahedrons.
The result is different. The result is different. If you wanted the volume of the surface to the lowest elevation of the surface simply multiply the plan area of the surface by the minimum surface elevation also shown in the statistics then subtract it from this volume. Check your 3d model view the stl file.
