[vtkusers] About vtkContourFilter memory

[scofield zhu]

HI ALL:

     I add vtkContourFilter to pipe line filters of my app.
     but this filter take up too much memory.
     It will cost about 300M memory to my 100M source volume data.
     it's terrible! now my work aim is to reduce memory lost,and i
don't how to deal with it,
     please provide me some tips to me,
     thank you