To Create a Curve Using the Extremum Analysis
1. Analyze the facet feature using any of the following analysis tools on the Analysis tab:
◦ > 
Shaded Curvature
Shaded Curvature◦ 
Draft
Draft◦ > 
Slope
Slope2. Save the computed analysis.
3. Click > > 
Analysis - Extremum.
Analysis - Extremum.4. Select points on the faceted data that approximately correspond to the extreme values of the analysis and lie on the same curve. Middle-click to finish selection.
◦ Selection of a single point causes the creation of a curve that follows the local extremum of the analysis.
◦ Selection of multiple points causes the creation of an open curve that approximately passes through the selected points while following the local extremum of the analysis.
 | The resulting curve is a curve on facets. It can be used to create domains and for automatic surfacing. |