[vtkusers] How to modify (points, cells) a visualized

[=?GB2312?B?tcuVRs7E?=]

sorry, but i'm not clear what you really meas, but i guess you can look at
the source code in the function:
void vtkPolyData::RemoveGhostCells(int level);
It remove cells from vtkPolyData, and it's easy to change.
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