How to pick a point in volume rendering?

zhang-qiang-github · March 27, 2024, 8:48am

In 3D slicer, 3D visualization used the volume rendering. And 3D slicer can pick a point from volume rendering. For example:

Is vtkPropPicker or vtkCellPicker userd? I can not pick a 3D point from volume rendering.

Any suggestion is appreciated~~~

cpinter · April 1, 2024, 12:24pm

I’d probably try starting from this code:

github.com

Slicer/Slicer/blob/3903a95c38730e522630569b114825dd0d7c9532/Libs/MRML/DisplayableManager/vtkMRMLThreeDViewInteractorStyle.cxx#L170-L183


      
          //---------------------------------------------------------------------------
          bool vtkMRMLThreeDViewInteractorStyle::QuickPick(int x, int y, double pickPoint[3])
          {
            vtkRenderer* pokedRenderer = this->GetInteractor()->FindPokedRenderer(x, y);
            vtkInteractorStyle* interactorStyle = vtkInteractorStyle::SafeDownCast(this->GetInteractor()->GetInteractorStyle());
            interactorStyle->SetCurrentRenderer(pokedRenderer);
            if (pokedRenderer == nullptr)
            {
              vtkDebugMacro("Pick: couldn't find the poked renderer at event position " << x << ", " << y);
              return false;
            }
          
            bool quickPicked = (this->QuickPicker->Pick(x, y, 0, pokedRenderer) > 0);
            this->QuickPicker->GetPickPosition(pickPoint);

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How to pick a point in volume rendering?

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