Hi VTK team,
starting with VTK9, there is an issue/a difference with respect to SetUserMatrix of vtkActor. Earlier (e.g. VTK 8.1.2), the matrix was correctly applied, but now this does not seem to be the case. Has there be some change?
My application shows DICOM images with their true DICOM orientation and a border (vtkPolyData, result of vtkResliceMapper’s SlicePlane being used in a vtkCutter for a vtkOutlineFilter applied to the image data), and while setting the Matrix from unrotated to rotated DICOM coordinates works perfectly with vtkImageSlice, it does not seem to apply to the vtkActor handling the border. While (obviously) rendering is correct in case of an identity matrix, it fails for other orientations since VTK9.
Has there been a change or is this a bug? How can I help fix this (locally with a work-around or in the VTK archive?). Is there a test case?