[vtkusers] Clip Volume using freehand 2D Curve ROI

[Mallikarjun K]

Hello Sebastian,longbowzhang and Simon,
I am sorry I couldn't participate in the discussion as I was away for
couple of days. Thank you all for your valuable time and pointers.

@Sebastian: Osirix viewer (on Mac) is also having this feature (Scissors)
to clip on volume rendering.

@longbowzhang: My mistake, may be I couldn't put the context properly. What
I mean is Clip on volume in the context of Volume Rendering only. Based on
your pointers
1.Can I use vtkboxwidget to draw a bounding box on the volume?  I didn't
get the pipeline exactly..if you have an example code that would be
helpful..

@Simon: I am not using Qt here. I used vtkcontourWidget to draw a curve on
the volume as shown below and got the vtkpoints along the curve. Using
these points I have created a vtkimpliciteselectionloop and tried to feed
this to setclipfunction of VtkClipDataset  which gives unstructured grid
output and thought of converting it to structured grid using vtkprobefilter
but  with no luck..:)

[image: Inline image 1]



On Thu, Mar 31, 2016 at 2:37 AM, longbowzhang <longbowzhangchina at gmail.com>
wrote:

> Hello Simon,
>
> Because the author asked "how to clip a volume w/ 2D hand drawn curve"
> rather than "on a Volume Rendering" context, I proposed to use
> vtkImageTracerWidget on selected slices. This is probably the easiest way.
>
> Like you said, if to clip a volume in the context of "volume rendering",
> besides the way you propose, I would propose another alternative.
>
> 1 Draw the bounding box (NOT outline) of the volume, but represent this
> 6-face-bounding-box in terms of Wireframe (via
> vtkActor->GetProperty()->SetRepresentationToWireframe());
> 2 Place the vtkImagePlaneWidget on the bounding box (as shown in the
> attached image);
> <http://vtk.1045678.n5.nabble.com/file/n5737450/traceOnBB.png>
>
> 3 Derive the stencil, which will be used as a mask for clipping in the
> context of volume rendering.
>
> I think this would work. What's your opinion?
>
>
>
> --
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-- 
*With Kind Regards:*
Mallikarjuna K,
07795531103/09908238861.
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