[vtkusers] Use vtkImageSlice GPU.

[Jose Barreto]

Use vtkImageSlice with vtkImageResliceMapper-> SetSlabThickness (images of
the maximum file MHD), is around + - 100 images added.

use to have this vision:
the problem is that when utilizdo any camera movement
(vtkInteractorStyleTrackballCamera) for this object, it is processed on the
CPU rather than the GPU.

I saw an old post that the interpolator Imageslice does not work with the
GPU, but that in 2011 an old version of VTK.
(http://www.vtk.org/Wiki/VTK/Image_Interpolators)

nowadays it is already possible to pass this processing to the GPU?
Has some way to ease the locking of this object when it is rendered?

I am using a computer with the following settings:
video card nvidia 730
intel i7 (3770) 3rd generation
Memory 16gb

and still move this object becomes unfeasible with active SetSlabThickness
for me.



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