Page 68 - 3DF Zephyr

Point cloud comparison This function allows to compute a comparison between two selected point clouds. A chart is then plotted that graphically explains the residuals as a histogram. You can notice the errors recap on the bottom of the window (mean error and variance). Users are supposed to run this tool after the two clouds have been aligned to each other. Cloud comparison parameters settings are as follows:  Distance type: it indicates the distance to be calculated and users can choose either "point to point" or "plane to point" distance;  Maximum Distance: it represents the highest value during the histogram computation;  Number of Bins: it defines the histogram amount of columns; As for the residuals computation process: - The first step computes the closest point of the model for every point of the target; - If a distance among a couple of points is greater than the maximum distance value, that distance won't be considered into the computation; It can be also possible to select parts of the histogram to highlight only a certain amount of points of the "model" point cloud directly in the 3D room. In the 'Point to point' comparison the histogram is built by considering the closest point A for each point B. All the spatial distances are from A to B are used to build the histogram