[vtkusers] Opacity Problem (Please help me)

[sandip goyal]

Hi VtkUsers,
                  I am working on the tomography data .My problem is to make the objects transparent depending on the gray level selected by the user from histogram .,i.e I want to make the data of particular gray values to become transparent. For this I used
 
 vtkTransferfunction SetPoint property and assigned the opacity to the volume property . But this method causes my system to become too slow & I am not able to do it iteractively with the mouse. 
 
Please suggest the method 
 
Thanking  You in advance
Sandip Goyal    

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