I saw a thread some time ago about importing a 3dmesh model into pix4dsurvey. I have no idea why it was closed. I think from the point of view of program development (besides comparing volumes from two DSMs/point clouds).
Sometimes vectorisation on a point cloud can be more difficult than vectorisation using a 3D model. It happens that you accidentally snap a point that is behind the object you want to contour about. you then have to skilfully rotate the point cloud and precisely target individual points. The ability to import a 3d model would make this process much easier.
Users, I hope this topic collects a large number of votes