[vtkusers] Volume rendering produces rough surface at clipping plane

[Sankhesh Jhaveri]

Hi Andras,

!4627 <https://gitlab.kitware.com/vtk/vtk/merge_requests/4627> implements a
mode in vtkVolumeProperty that lets you use custom intensity values for
voxels in the clipped space when computing gradients at the clip face.

Best,
Sankhesh
​

On Fri, Nov 3, 2017 at 10:48 AM Andras Lasso <lasso at queensu.ca> wrote:

> Hi all,
>
>
>
> I’m working on visualizing cardiac images using volume rendering. I need
> to cut into the volume to see surfaces inside the heart, which works quite
> well by using clipping planes of the volume mapper. The only problem is
> that that surface at the cut plane looks very rough, which makes it
> difficult to distinguish from actual endocardial surfaces. If I “cut” the
> volume by setting voxel values outside the clipping box to “empty” (-1000 =
> air intensity value) then the cut surface looks nice – smooth and flat. See
> example for both cutting method in the attached files.
>
>
>
> Is there a way to change volume renderer to get smooth cut surfaces (the
> same look as we get by setting outside voxels to “empty” values)?
>
>
>
> Andras
>
>
>
> ---
>
>
>
> See full resolution images and more examples here:
>
> https://1drv.ms/f/s!Arm_AFxB9yqHsOsClG_QsMx-4sh8rg
>
>
>
> CT volume can be downloaded from here:
>
> http://slicer.kitware.com/midas3/download/item/292309/CTA-cardio.nrrd
>
>
>
> ________________________
>
> Andras Lasso, PhD
>
> Senior Research Engineer, Associate Director (Engineering)
>
> Laboratory for Percutaneous Surgery
>
> School of Computing, Queen's University
>
> Kingston, ON, Canada
>
>
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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