[vtkusers] About vtkContourFilter question, please help me

[scofield zhu]

Hi All:
       i meet a problem,  and it's urgent to me, please help me!

       the problem description:
       I want to create mask surface actor and split surface actor
using same function called__GenerateSurfaceData to create surface
data.
       But when application run at the following codes, application crashed.
       	       surfaceFactory.CreateSplitSurfaceActor(
self.__MaskImageData, [3, 4], (1.0, 0.0, 0.0) )
 	       surfaceFactory.CreateMaskSurfaceActor( self.__MaskImageData,
5, ( 0.0, 1.0, 0.0 ) )	#crash inside this call
       why this problem occur only through same calling step?

       attach file is code file

       thank you!
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