Open the file FeatureLines.3dr.
The idea is to compute the intersection and use it to reconstruct the sharp edge:
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Launch Region Grow Plane, adjust the tolerance to 1cm and click on the left side of the pillar. Extract only the plane. Then repeat with the front side.
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Select both planes and compute the Intersection. Show only the intersection line and the mesh. If you double click on the line, you can modify its length.
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Select the mesh and the line, then launch the command Sharp Edges.
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Right click in the scene to open the contextual menu: change the Representation to Flat + Wire.
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Set the Cleaning Distance to 0.1 m.
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Click on Preview: the mesh is modified, from 0.1 m from both side of the line, in order to respect the given feature line.
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The edge of the pillar is now perfectly straight.
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Compare the original edge with the reconstructed edge