This functionality highlights the contour of the object. To apply it, select the object in the VTK Viewer, right-click on it and choose in the context menu Representation -> Feature edges.
To select, which contours should be highlighted, in the Main menu choose View -> Windows -> Feature Edges
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Feature edges angle - allows to define at which minimum angle between two faces a wire is considered an edge.
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Show feature edges - allows to display feature edges.
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Show boundary edges - allows to display boundary edges.
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Show manifold edges - allows to display manifold edges.
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Show non-manifold edges - allows to display non-manifold edges.