[vtkusers] Fwd: How to create a cube with vtkPolyData

[Jothy]

---------- Forwarded message ----------
From: Jothy <jothybasu at gmail.com>
Date: Tue, May 18, 2010 at 3:41 PM
Subject: Re: [vtkusers] How to create a cube with vtkPolyData
To: Scott Johnson <Scott.Johnson at neuwave.com>
Cc: VTK <vtkusers at vtk.org>


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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