[vtkusers] How to make vtkImageViewer2 to show an actor only in a certain depth

Miro Drahos mdrahos at robodoc.com
Mon Jun 16 14:27:30 EDT 2014

Hi Sam,
if your surface is not too large, it shouldn't hinder the performance much.
I cut a polydata with ~20k vertices interactively, by sliding the cut 
plane and there are no issues (on a lower-end NVIDIA GPU).

To answer your question: there is another way -- you could use clipping 
range of the camera and let the camera frustum cut your surface, but I 
would advise against this hack. Just stick with the vtkCutter. It uses a 
point locator (sort of a hash-table) to speed up the lookup and really 
shouldn't give you much of performance penalty.

On 06/16/2014 10:43 AM, Sam Raby wrote:
> Thanks for the feedback.
> Consider a scenario that you have a slider-bar which scroll through 
> DICOM files and then this "clipping" has to happen for each slice 
> repeatedly. I am afraid that this would not allow the slider-bar to 
> smoothly move, but maybe there no faster way presently.
> Is there a way to hide only a part of an actor, and not the entire 
> actor (instead of cutting it)?
> -Sam
> On Mon, Jun 16, 2014 at 12:21 PM, Miro Drahos <mdrahos at robodoc.com 
> <mailto:mdrahos at robodoc.com>> wrote:
>     If what you want is to cut your sphere and visualize the
>     intersection of the sphere (a circle) with the viewer plane, use
>     vtkCutter.
>     The sphere polydata is the input, the reslice plane is the
>     cutFunction.
>     HTH,
>     Miro
>     On 06/13/2014 02:34 PM, Sam Raby wrote:
>         Hello,
>         I have a simple actor as simple as sphere and would like to
>         show it in a certain depth in vtkImageViewer2.
>         vtkImageViewer2 displays all the actors which are above the
>         image, but is there a way to force vtkImageViewer2 to show
>         only that part of sphere actor that is in the same depth as
>         the image?
>         I saw a post [1] stating that the following may do the job,
>         but I could not make it work:
>         interactorStyle->AutoAdjustCameraClippingRangeOff().
>         thanks,
>         -sam
>         [1] http://www.vtk.org/pipermail/vtkusers/2008-August/047565.html

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