Auto-Detect Sphere Centers.

SA can search a point cloud and detect registration spheres within the cloud, and build the center points for those detected spheres.

Provide the command with the expected sphere diameter, acceptable RMS tolerance, and minimum number of points required, and the command will detect spherical data matching the proposed diameter from the scan data, fit spheres to them, and create their center points.

Create point from cloud sphere extraction now includes an option to perform a “Final Fit” option which implements ASTM E3125-17 fitting algorithms. The point cloud data is filtered so that only a central cone opening angle of 120° is used to compute the sphere and its center point.

Note that the input cloud must be associated with an instrument to establish the line of sight vector used for cloud segmentation as per this standard which then applies a conical outlier rejection strategy to further refine the fit results.

To Auto-Detect Sphere Centers from Raster Scan Data:

  1. From the menu, select Construct>Points>From Cloud Points>Auto- Detect Sphere Centers.

  2. The Sphere Extraction Settings dialog appears:

  1. Select the desired options, then click OK.

  2. After calculation, SA will display the Sphere Auto-Detection Results dialog. This contains the RMS error, maximum error, and point count for each detected sphere.

  1. Click OK to accept the results, or Cancel to cancel.