[vtkusers] vtkExtractVOI~~~~ SetVOI~~~Parameter??

[Joshua Thomas]

Dear All,

I am using Vtk with TCL.

My question is; is it necessary to write a sample function to set the
coefficients for the volume data?

My image dimensions are 512 X 512 X 123

vtkExtractVOI extract
  extract SetVOI 512 629 512 429 125 125  (My problem is here)
  extract SetInput [samp GetOutput]
  extract SetSampleRate 1 2 3 
  extract ReleaseDataFlagOff

I would like to cut off  the portion of my isosurface. Please click
the below link

http://kcn.kdupg.edu.my/webpage/staff/jjoshua/cface.jpg

Need anybody's help.

Thanks in advance
Joshua