Laserscan PointCloud - Volume calculating with CloudCompare

Workflow for volume calculating with CloudCompare using the example of a tunnel scan. Derived outlier-removed point cloud from terrestrial Laserscanner was the input data.
The calculated volume is the metric volume btw. two superimposed point clouds in qubic-meters (m³). The function also deliver a elevation difference raster (projected 20 meters below our cloud - zoom out). Better way to calculate visualize elevation differences is shown in my other video.