About vtkResliceCursorWidget

hi, in the vtkResliceCursorWidget example used according to the official documentation, I found that after using the real DICOM data, when I rotated it I found other white padding in the background, which I hope to eliminate. thank you!

Looks like close to my issue in the topic: https://discourse.vtk.org/t/problem-with-imagereslice/9705, you need to set the background color.

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Your help was very much appreciated.