Close a hole in a PolyNURBS by creating a new face to fill the void.
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On the ribbon, click the PolyNURBS tab.
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Click the Close Hole icon.

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Click the PolyNURBS object, the loop belonging to a hole is displayed in blue.
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Click an edge belonging to a closed loop.
Note: You can close multiple holes in a single close hole operation.
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Right-click and mouse through the check mark to exit, or double-right-click.