To create a Point Cloud Picked-Points alignment using dynamic points

The Point Cloud Picked-Points alignment enables you to align a part to the CAD model by matching target points on the CAD to selected regions in one or more point clouds. The point clouds must cover at least three faces of the part so that the target points can fix the six degrees of freedom.

To create a picked points alignment from a point cloud:

1. Click Home tab > Mouse Context panel > Dynamic Points Editor. The Dynamic Points context tab is displayed.
2. Select points on the CAD model using the Dynamic Points Editor. You must select at least six points and the points must fix the part in all six degrees of freedom.
3. Click Dynamic Points tab > Items > Point-Cloud Picked-Points Alignment. The points are listed in the Point Cloud Picked-Points Alignment dialog. For example:

   

4. Enter a Name for the alignment.
5. To use a constant-sized region for each target point, select the Use constant selection sphere diameter check box and enter a Selection Sphere Diameter to specify the region size.
6. Click Add. The Pick Target / Regions dialog is displayed.
7. Click the Show coordinates check box to display the details of your selections.
8. To specify the area of the point cloud that matches a point:
   1. Select the point in the list. An target is displayed at the location.
   2. Left-click and hold the point cloud at the centre of the region that matches the selected point, drag the cursor to select points from the point cloud, then release the mouse button. Alternatively, if you selected the Use constant selection sphere diameter check box, double-click the point cloud.

      A sphere is displayed in the CAD view to show the region of the point cloud you selected. The point cloud, the location of the region centre, the region radius, and the number of points in the region are displayed in the coordinates list.

9. Repeat step 8 for each dynamic point in the list. When you have finished, click to save your selections and close the dialog.
10. To create an alignment from point clouds taken by different measuring devices or from different device positions, select the Use transformed data check box. PowerInspect converts the device coordinates to CAD coordinates so that the calculations are made using a common reference system.
11. To display the alignment in the CAD view, and on the Report and Info tabs, select the Output in report check box.
12. In the Projection proximity criteria box, enter the maximum distance a point can be from the CAD surface. If a point exceeds this distance, it is ignored.
13. To optimize the alignment:
    1. Select the Best fit after establishing rough alignment check box.
    2. In the Maximum iterations box, enter the maximum number of times you want PowerInspect to perform the best-fit calculations.
14. Click OK to save your changes and create the alignment.