Select Surfaces toolbar
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SelClosedSrf
Select all closed surfaces.
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SelOpenSrf
Select all open surfaces.
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SelPicture
Select all objects created with the Picture command.
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SelPlanarSrf
Select all planar surfaces.
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SelSrf
Select all surfaces.
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SelTrimmedSrf
Select all trimmed surfaces.
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SelUntrimmedSrf
Select all untrimmed surfaces.
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SelVisible
Select all surfaces or meshes that are in front of other objects with a crossing selection.