Aligning Clouds

• Do not modify the reference (cloud or surfaces).

• To reduce the computation time, filter the cloud to align.
  Use the homogeneous filtering (the repartition of points is more suitable),
  and choose a filtering value that leaves only a few thousand points.

• You can either:

  • Select the whole cloud to align, and the whole reference (cloud or surfaces).

  • or portions of the cloud and only some surfaces of a model.
    In this case, be careful that the selected areas/surfaces have similar shapes.

This first step may take a few minutes.

1. Check whether the cloud has been aligned correctly.

2. Depending on what you see:

   • If the result is not correct,

     • Undo the alignment and start again.

     • This time, try to select a characteristic portion of the cloud to align, and its counterpart on the reference:
       for instance, if the shape is symmetrical, select a portion that is not.

   • If the result is correct,

     • Hide the cloud to align and unfilter the output cloud.

     • Select the whole output cloud and the reference,

     • Repeat this step if necessary.

     • If the cloud to align is large, you can filter it, but keep more points than for the first step.

3. Now, the result seems correct:

   Use the Deviation Analysis for the last controls. The first set is the cloud to align, the second set is the reference cloud or the surfaces. Set the Discretization at 100, uncheck Min/Max Values, Points and Spikes. Use the Limited color range with the values you require. Faulty areas will appear in red, correct areas in green.

4. To remove faulty areas:

   Select the areas in red, and some areas in green, and launch another computation. The areas in green will act as a fastener, while the areas in red will be improved.