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### COPALIGN Command Mode Text

The COPALIGN command allows you to align clouds of points with your CAD data.

F1=COPALIGN/REFINE = NONE,n,

ROUGH ALIGNPAIR/

THEO/x,y,z,i,j,k,

MEAS/x,y,z

REF,,

n represents the number of points to be used for RANDOM and UNIFORM types and the number of points used for FACE type.

The different types of REFINE in COPALIGN commands are:

- NONE - In this no refined alignment is performed

- RANDOM - In this case n points randomly selected in the cloud of points are used to refine the alignment by projecting them on CAD and determining the best fit transformation which is then used to align the cloud of points to CAD.

- FACE - This type of refinement is done with respect to planar faces in the CAD model. Points from the cloud of points located within a certain distance from each planar face are selected and used in a way similar to the above cases.

- UNIFORM - Same as above except for the way points are selected, which in this case are selected uniformly in the cloud of points.

ROUGH ALIGNPAIR/

THEO/x,y,z,i,j,k,

MEAS/x,y,z

A set of at least 6 rough alignment pairs of points is defined/selected graphically. THEO/ represents the point on CAD and MEAS/ the corresponding point on the cloud of points. These pairs are used to determine a rough transformation between CAD and the pointcloud which will allow the cloud of points to come close enough to CAD to allow further refinements of the alignment.

REF,,

Defines the COP command to be aligned.