Facet Modeling > Point Handling > Fill Hole > To Fill Holes in the Point Set
  
To Fill Holes in the Point Set
1. Select the points in the point set surrounding the gap that you want to fill.
2. Click Points > Fill Hole.
The Fill Hole command inserts points in the holes or gaps in the selected area of the point set based on the density and curvature of the surrounding points.
 
If you do not select the area while using this command, points are inserted in all the gaps or holes.
If the region with holes is smooth and continuous, you can get good results after using this command.
The results of this command depend on the orientation of the model.