[vtkusers] Version differences related with opacity

[이현철]

Dear Sir/Madam,

I created a isosurface using vtkMarchingContourFilter, and put opacity under
1.0.
The image looks abnormal in vtk 5.2.1.

But if I use vtk 5.6.0, it gets normal.

Do you know any differences related with this phenomenon* *between these two
version ?

Even though I used depth peeling or depth sorting in vtk 5.2.1, it didn't
get better.

I attached two images in vkt 5.2.1 and vtk 5.6.0.
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