Length Measurement (Forward Intersection)
Function Description: Length measurement tools are available for panoramic data and allows the user to query the distance information between multiple points. The measurement result represents the Euclidean distance of the point in the three-dimensional space.
Steps
1.Click Length(stereo) 
button via Panorama Measurement mode.
2.Left-click to select the starting point in the scene, the operation is the same as the Pick Point step.
3.Select the end point, the operation is the same as the Pick Point step.
4.Right-click to go back to the previous point during the measurement.