Hi, all I have a vtkPolyData, and I know it's composed of some polygons. Now I want to get the point list of each polygon, how? vtkPolyData::GetPolys() seems helpful, but I don't know how to deal with a vtkCellArray which it returns. Please give me a solution. Thank you very much! Dai Shuo dai_shuocn at 163.com 2002-06-05