The Remove Invalid Points menu item will remove invalid points from the currently selected geometry object. The exact behavior varies based on the geometry type.
This is an inplace operation; existing geometry will be updated and no new geometry will be added.
Grids:  Grid lines with invalid elevations (i.e., NaN values) will be selectively removed until all remaining grid lines contain only valid elevations. 
Meshes:  If the mesh is an indexed mesh, vertex points that are not referenced by any index are removed. All other values are preserved. Triangles with zero area are also removed. 
If the mesh is a nonindexed mesh, any triangle with zero area is removed. Triangles containing invalid points are also removed.
Polygons:  Invalid data points are removed. Note that this may result in a badly formed polygon. 
Polylines:  Invalid data points are removed. This may result in a selfintersecting polyline. 
Regions:  Invalid data points are removed. Note that this may result in a badly formed region. 
Scatter:  Invalid data points are removed. 
