[vtkusers] how to change the color of single picked cell

[Longfei Cong]

Hi:
 i am  a new user of vtk. i use the vtkPolyData to show a surface. I want to use the mouse to click a cell and show the picked cell with a different color. I am not familiar with 'vtkCellPicker'. Could anyone give me some examples( in c++)? 
      Thanks a million!
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Longfei Cong
National Laboratory of Pattern Recognition
Institute of Automation, Chinese Academy of Sciences
Tel:86-10-62659278
Fax:86-10-62551993
Email:lfcong at nlpr.ia.ac.cn
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