[vtkusers] Clip volume data

[Dean Inglis]

Hi Weiguang,

you can use non-axis aligned planes to crop a volume by retrieving the 6
planes defining
the box widget in a call back and passing them to your volume mapper:

  vtkBoxWidget2 *self = reinterpret_cast<vtkBoxWidget2*>( caller );
  vtkBoxRepresentation2* rep =
      vtkBoxRepresentation2::SafeDownCast( self->GetRepresentation() );
  rep->GetPlanes( this->Planes );
  this->Volume->GetMapper()->SetClippingPlanes( this->Planes );

Dean



On Tue, Aug 20, 2013 at 2:05 PM, Weiguang Guan <guanw at rhpcs.mcmaster.ca>wrote:

> Hello,
>
> I have a volume data of vtkImageData type, and would like to do volume
> rendering of a portion of it, specified by a vtkBoxWidget. The box widget
> is rotation enabled so that the region of interest may not align with x-y-z
> axes. I hesitate to use vtkClipVolume because it would change the data to
> unstructured gird data and the fast texture-mapping based volume rendering
> couldn't be used. Can someone suggest a better solution for what I want to
> do? Thanks.
>
> Best,
> Weiguang
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