- Select the curve you wish to deform by fitting it to the
geometry.
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Select the target element to which the curve should fit.
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In the Fitting area, define the deformation parameters.
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Right-click the Free label to impose a continuity constraint:
Free, Point,
Tangent, or Curvature
-
Click Fit.
The curve is projected onto the target geometry. 
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Repeat the operation to deform the curve step-by-step and to fine-tune the fit.
- Optional:
Select Automatic trap to reduce the number of points to be taken
into account when the target element is a cloud of points containing many points.
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Click OK.
The new curve fit as best the cloud of points.
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