Surfaces are a type of geometry that can be used to create solid features. Surface tools are available on the Surfaces toolbar.
You can use surfaces in the following ways:
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Select surface edges and vertices to use as a sweep guide curve and path.
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Create a solid or cut feature by thickening a surface.
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Extrude a solid or cut feature with the end condition Up to Surface or Offset from Surface.
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Create a solid feature by thickening surfaces that have been knit into a closed volume.
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Replace a face with a surface