| Select the Cloud to Align (this is the cloud or mesh to reposition). 
        Use Hide/Show
           as required.Click  Add to define a first constraint by pairing two elements, one on the
cloud to align, the second on the reference.Select a point on the cloud to align then 
            a point on the 
            reference. The reference elements can be a set of clouds or meshes, surfaces, or a set of points.In the dialog box, place your cursor on the line of this constraint 
            and click under X, Y, Z to freeze or unfreeze those axes. 
Define a second constraint, then a third constraint (until the light is green).Decide to keep the initial cloud or not. Click Apply to start the alignment.      Click More to display the  
      Statistics.
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