[vtkusers] Newbie question about vtkBMPReader

[Mauricio Reyes]

Hi  VtkUsers! ..

IF I want to use vtkMarchingCubes (or vtkMarchingSquares) with
vtkBMPReader , how I select the isovalue?..
..is a combination of the RGB ?, or I have to read just one plane , R, G
or B??.

I expect my question is understandable..sorry for my english :)

Thanks in advance
Mauricio Reyes.