[vtkusers] memory problem after showing vtkpolydata object

[廖胜辉]

Dear all,   
    I found a memory problem after showing vtkpolydata object. 
    For example, check the system memory used (mem_number_1) after load a vtkpolydata object, do rendering, release the rendering, then check again the system memory used (mem_number_2). The resulting mem_number_2 is usually big than mem_number_1, that is, some memeory may not be released after rendering.

   Has someone find the same prbolem? Or can solve this problem? Thank you very much!

   (For test, you can open the vtkMDI program, check the system memory used, load some big vtkpolydata object do rendering and close the rendering window, then check again the system memory used) (You can also using debgu break to test this problem using some core program)

Best regards,
S-H Liao
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