MPR slice interaction causes background to expand

Development
1

Question

I am implementing an MPR viewer using VTK (axial / sagittal / coronal) based on the FourPaneViewer / ResliceCursor examples.

My setup includes:

  • vtkResliceImageViewer

  • vtkResliceCursorWidget

  • vtkImagePlaneWidget

  • Custom LeftButtonPressEvent observer to reposition the reslice cursor

  • Parallel projection camera

Problem:
When I move slices (mouse click, scroll, or reslice cursor interaction), the image itself stays centered but the background expands or shrinks

I have tried:

  • Enabling parallel projection

  • Calling ResetCamera() only once

  • Disabling auto camera clipping (SetAutoAdjustCameraClippingRange(false))

  • Restoring ParallelScale after slice changes

But the background scaling issue still occurs

image
image865×677 72.7 KB

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