[vtkusers] Use vtkImageSlice GPU.

[David Gobbi]

Hi Jose,

The slab mode of vtkImageResliceMapper uses the CPU. If you need really
fast slabs, you should use VTK's GPU volume rendering.

To make vtkImageResliceMapper's slab mode go a little faster, you can play
with the SetSlabSampleFactor() method and SetImageSampleFactor() method.

 - David



On Thu, Aug 27, 2015 at 7:53 AM, Jose Barreto <jose.de.paula at live.com>
wrote:

>
> 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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