[vtkusers] How to create a cube with vtkPolyData

Tue May 18 12:23:15 EDT 2010

The hexahedra is a solid. The sphere and cube are "shells". When you
cut the hexahedra you will get interior faces because it is solid.
When you cut the sphere and cube you do not get interior faces because
they are "shells".

On Tue, May 18, 2010 at 11:48 AM, Jothy <jothybasu at gmail.com> wrote:
> 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>
>> >> 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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