[vtkusers] How to create a cube with vtkPolyData

Tue May 18 11:48:08 EDT 2010

I have a beam passing through the vtkImageData.While I scroll through the
ImageData it should cut the beam and display it over the imagedata. Please
see the screenshot.Its simply a beam from the x-ray machine.

I was able to cut spheresource and cube source and able to get contours with
out this diagonals. But when I try to create it with hexahedron it becomes
like this.

Thanks,

Jothy

On Tue, May 18, 2010 at 3:56 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> If you don't clip it, you will not see the interior.
>
> I am still confused about what you are trying to do.
>
>
> On Tue, May 18, 2010 at 10:41 AM, Jothy <jothybasu at gmail.com> wrote:
> > I have tried it earlier. It works fine when you display it as surface.
> But I
> > want to display it as a wireframe , I mean only the outline.So that you
> can
> > see the dose values and ROIs properly.
> >
> > (I wonder, there must be someone on the list from the planning system
> > developers, but they keep their mouth tight!).
> >
> > Thanks,
> >
> > Jothy
> >
> > On Tue, May 18, 2010 at 3:26 PM, Scott Johnson <
> Scott.Johnson at neuwave.com>
> > wrote:
> >>
> >> Hello Jothy,
> >>
> >>
> >>
> >> It looks like the plane is being rendered as wireframe.  Try rendering
> it
> >> as a semi-transparent surface to see if it goes away.  I’m not sure how
> to
> >> get just the outline.
> >>
> >>
> >>
> >>                                 -- Scott
> >>
> >>
> >>
> >> From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
> Behalf
> >> Of Jothy
> >> Sent: Tuesday, May 18, 2010 5:15 AM
> >> To: David Doria
> >> Cc: VTK
> >> Subject: Re: [vtkusers] How to create a cube with vtkPolyData
> >>
> >>
> >>
> >> Screenshot is here!
> >>
> >>
> >> On Tue, May 18, 2010 at 11:12 AM, Jothy <jothybasu at gmail.com> wrote:
> >>
> >> Hi David,
> >>
> >> I tried the vtkHexahedron example. But, when I try to cut this I get a
> >> line across the cut plane . see the screenshot and also the code.
> >>
> >> Could you please figure it out?
> >>
> >> from vtk import*
> >>
> >>
> >> #Setup the coordinates of eight points
> >> #(the two faces must be in counter clockwise order as viewd from the
> >> outside)
> >> P0 = [0.0, 0.0, 0.0];
> >> P1 = [1.0, 0.0, 0.0];
> >> P2 = [1.0, 1.0, 0.0];
> >> P3 = [0.0, 1.0, 0.0];
> >> P4 = [0.0, 0.0, 1.0];
> >> P5 = [1.0, 0.0, 1.0];
> >> P6 = [1.0, 1.0, 1.0];
> >> P7 = [0.0, 1.0, 1.0];
> >>
> >>
> >> #Create the points
> >> points = vtkPoints();
> >> points.InsertNextPoint(P0);
> >> points.InsertNextPoint(P1);
> >> points.InsertNextPoint(P2);
> >> points.InsertNextPoint(P3);
> >> points.InsertNextPoint(P4);
> >> points.InsertNextPoint(P5);
> >> points.InsertNextPoint(P6);
> >> points.InsertNextPoint(P7);
> >>
> >> #Create a hexahedron from the points
> >> hexa = vtkHexahedron();
> >> hexa.GetPointIds().SetId(0,0);
> >> hexa.GetPointIds().SetId(1,1);
> >> hexa.GetPointIds().SetId(2,2);
> >> hexa.GetPointIds().SetId(3,3);
> >> hexa.GetPointIds().SetId(4,4);
> >> hexa.GetPointIds().SetId(5,5);
> >> hexa.GetPointIds().SetId(6,6);
> >> hexa.GetPointIds().SetId(7,7);
> >>
> >> #Add the hexahedron to a cell array
> >> hexs = vtkCellArray();
> >> hexs.InsertNextCell(hexa);
> >>
> >> #Add the points and hexahedron to an unstructured grid
> >> uGrid =vtkUnstructuredGrid();
> >> uGrid.SetPoints(points);
> >> uGrid.InsertNextCell(hexa.GetCellType(), hexa.GetPointIds());
> >> aBeamMapper = vtkDataSetMapper()
> >> aBeamMapper.SetInput(uGrid)
> >> aBeamActor = vtkActor()
> >> aBeamActor.SetMapper(aBeamMapper)
> >> aBeamActor.AddPosition(0,0,0)
> >> aBeamActor.GetProperty().SetColor(1,1,0)
> >> aBeamActor.GetProperty().SetOpacity(0.60)
> >> aBeamActor.GetProperty().EdgeVisibilityOn()
> >> aBeamActor.GetProperty().SetEdgeColor(1,1,1)
> >> aBeamActor.GetProperty().SetLineWidth(1.5)
> >>
> >> #create a plane to cut,here it cuts in the XZ direction (xz
> >> normal=(1,0,0);XY =(0,0,1),YZ =(0,1,0)
> >> plane=vtkPlane()
> >> plane.SetOrigin(0.5,0,0)
> >> plane.SetNormal(1,0,0)
> >>
> >> #create cutter
> >> cutter=vtkCutter()
> >> cutter.SetCutFunction(plane)
> >> cutter.SetInput(aBeamActor.GetMapper().GetInput())
> >> cutter.Update()
> >> cutterMapper=vtkPolyDataMapper()
> >> cutterMapper.SetInputConnection( cutter.GetOutputPort())
> >>
> >> #create plane actor
> >> planeActor=vtkActor()
> >> planeActor.GetProperty().SetColor(1,0.5,0.5)
> >> planeActor.GetProperty().SetLineWidth(2)
> >> planeActor.SetMapper(cutterMapper)
> >>
> >> # Setup a renderer, render window, and interactor
> >> renderer = vtkRenderer()
> >> renderWindow = vtkRenderWindow()
> >> #renderWindow.SetWindowName("Test")
> >>
> >> renderWindow.AddRenderer(renderer);
> >> renderWindowInteractor = vtkRenderWindowInteractor()
> >> renderWindowInteractor.SetRenderWindow(renderWindow)
> >>
> >> #Add the actor to the scene
> >> renderer.AddActor(aBeamActor)
> >> renderer.AddActor(planeActor)
> >> renderer.SetBackground(0,0,0) # Background color white
> >>
> >> #Render and interact
> >> renderWindow.Render()
> >>
> >>
> >> I think it has be passed through a filter. But what it's that??
> >>
> >> Thanks,
> >>
> >> Jothy
> >>
> >>
> >> On Mon, May 17, 2010 at 10:08 PM, David Doria <daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
> >
> >> wrote:
> >> > On Mon, May 17, 2010 at 5:03 PM, Jothy <jothybasu at gmail.com> wrote:
> >> >> Hi all,
> >> >>
> >> >> I want to create a hexahedron using vtkPolyData. I think there is no
> >> >> example in wiki. I created it with a vtkHexaHedron but when I cut it
> >> >> it produces a line across the cut section.I don't want this. I am not
> >> >> able to solve this problem for many months.I used it passing through
> >> >> vtkstripper, vtkTriangle. Finally found that only if the input is of
> >> >> vtkPolyData, cutter will not produce that line across the cut
> section.
> >> >> Can some with kind enough :), add an example of how to create cube or
> >> >> cone with vtkPoldata.
> >> >>
> >> >> Many thanks,
> >> >>
> >> >> Jothy
> >> >
> >> > I don't really understand your question. The title and your last
> >> > sentence talk about cubes and cones
> >> >
> >> > http://www.vtk.org/Wiki/VTK/Examples/GeometricObjects/Cube
> >> > http://www.vtk.org/Wiki/VTK/Examples/GeometricObjects/Display/Cone
> >> >
> >> > but the beginning talks about hexahedrons
> >> >
> >> > http://www.vtk.org/Wiki/VTK/Examples/GeometricObjects/Hexahedron
> >> >
> >> > Let us know if these links do not help.
> >> >
> >> > David
> >> >
> >>
> >>
> >
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