I have made several missions using the Do-Set-Cam-Trigg-Dist command and a distance of 6 meters.
But the number of shooted photos considering the distance the copter flew from first to last waypoint is about the half .
The camera a Sony A7R as all capabilities to shoot every second and the mission speed was 3 meters per second , so the camera had 2 seconds to take a shoot.
Do the command Do-Set-Cam-Trigg-Dist work only when flying on the survey lines and not when flying from a line to another ? That could explain missing photos from total distance flew divided by numbers of photos shooted.