I have derived a 4x4 transformation matrix t which I want to apply to a 3d vtkImageData.

To apply t to the imagedata I use vtkTransformFilter:

```
transform_filter = vtk.vtkTransformFilter()
transform_filter.SetInputData(imgdata)
transform_filter.SetTransform(t)
transform_filter.Update()
```

If I create a contour of transform_filter it shows that the transformation is done correctly (since I know what the result should look like). However the light on the contour seems very weird, it is almost not visible.

I also tried applying t to the imagedata via vtkImageReslice:

```
resliced = vtk.vtkImageReslice()
resliced.SetInputData(imgdata)
resliced.SetAutoCropOutput(True)
resliced.SetResliceTransform(t)
resliced.SetInterpolationModeToLinear()
resliced.Update()
```

However, when I create a contour of this result, the orientation of the object is different.

It seems applying transformation matrix t via vtkTransformFilter yields a different result from applying the same transformation matrix using vtkImageReslice. Therefore I was wondering if anybody would know what additional steps I would need to apply prior to transforming via vtkImageReslice to obtain the same result as with vtkTransformFilter.