Silhouettes
You can select the silhouette edge of a rounded surface, such as a cylinder.
To set silhouette edge visibility, click Options (Standard toolbar) or Tools, Options, and select Display/Selection, Dynamic highlight from graphics view.
Silhouette edges are included in box-select operations.
To select a silhouette edge:
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Open a sketch on a model face, plane, or in an active drawing view.
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Select one of the tools:
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Convert Entities
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Offset Entities
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Smart Dimensions
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Add Relations
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Move the pointer over a cylindrical face until the pointer changes to
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Select the highlighted edge.