[vtkusers] using vtkClipClosedSurface() on a box crashes
David Gobbi
david.gobbi at gmail.com
Mon May 25 20:32:28 EDT 2015
Hi Kent,
Yes, it displayed half a box (see attached screenshot).
Let's just say that code like "vtkPoints vtkPoints = new vtkPoints();"
doesn't fill me with confidence. Can you try building the polydata
as per my python example and see if that works?
- David
On Mon, May 25, 2015 at 6:23 PM, kent myers via vtkusers <vtkusers at vtk.org>
wrote:
> Hi David,
>
> I did display the box successfully. This method was extracted from a
> complete demo application that I submitted to the bug tracker as issue
> 0015487. I have attached it here if you want to look at it. This would
> not be the first time that the Java API crashes using methods that work in
> other languages.
>
> You said it ran without errors. Did you get a properly clipped box as a
> result? It started out as a cube and I put the clipping plane half the
> height of the cube.
>
> Thanks for taking a look.
>
> Kent
>
>
>
>
>
> On Monday, May 25, 2015 5:09 PM, David Gobbi [via VTK] <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5731997&i=0>> wrote:
>
>
> Hi Kent,
>
> Your code for building the polydata looks suspicious. If you put your box
> polydata directly into the mapper (i.e. without vtkClipClosedSurface) does
> it display properly?
>
> I translated your code into python (I'm not much of a Java programmer),
> and it ran without any errors:
>
>
> from vtk import *
>
> points = [
> 0.0, 0.0, 0.0,
> 1.0, 0.0, 0.0,
> 1.0, 1.0, 0.0,
> 0.0, 1.0, 0.0,
> 0.0, 0.0, 1.0,
> 1.0, 0.0, 1.0,
> 1.0, 1.0, 1.0,
> 0.0, 1.0, 1.0,
> ]
>
> seq = [
> 4, 0,1,2,3,
> 4, 1,5,6,2,
> 4, 5,4,7,6,
> 4, 4,0,3,7,
> 4, 0,1,5,4,
> 4, 3,2,6,7
> ]
>
> # create a plane for clipping
> plane = vtkPlane();
> plane.SetOrigin(0.0, 0.0, 0.5);
> plane.SetNormal(0, 0, 1);
>
> # create the box from points and sequence
> polyData = vtkPolyData();
> pts = vtkPoints();
> for i in range(8):
> pts.InsertNextPoint(points[i*3:(i+1)*3])
> polyData.SetPoints(pts);
> cells = vtkCellArray();
> for i in range(6):
> cells.InsertNextCell(4)
> for j in range(1,5):
> cells.InsertCellPoint(seq[5*i + j])
> polyData.SetPolys(cells);
>
> clipClosedSurface = vtkClipClosedSurface();
> planes = vtkPlaneCollection();
> planes.AddItem(plane);
> clipClosedSurface.SetClippingPlanes(planes);
> clipClosedSurface.AddInputData(polyData);
> clipClosedSurface.Update(); # THIS CRASHES
>
> clipMapper = vtkDataSetMapper();
> clipMapper.SetInputConnection(clipClosedSurface.GetOutputPort());
>
> boxActor = vtkActor();
> boxActor.SetMapper(clipMapper);
> boxActor.GetProperty().SetColor(0.8900, 0.8100, 0.3400);
>
> ren = vtkRenderer()
> ren.AddActor(boxActor)
>
> win = vtkRenderWindow()
> win.AddRenderer(ren)
>
> iren = vtkRenderWindowInteractor()
> win.SetInteractor(iren)
>
> iren.Initialize()
> iren.Start()
>
> On Mon, May 25, 2015 at 5:18 PM, kent myers via vtkusers <[hidden email]>
> wrote:
>
> I am trying to clip a box constructed as a polydata mesh. I have tried the
> vtkClipPolyData class based on the quadric surface example in the following
> link, but have not succeeded.
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/SolidClip
>
> I found the vtkClipClosedSurface class and it seems like exactly what I am
> looking for, but I could not find any examples of how to use it. The code
> below shows my attempt. It crashes when calling the Update() method.
> Without that call, I get no visible result.
>
> Any help would be appreciated!
>
> Kent
>
> private static void createBox() {
> float[] points = {
> 0.0f, 0.0f, 0.0f,
> 1.0f, 0.0f, 0.0f,
> 1.0f, 1.0f, 0.0f,
> 0.0f, 1.0f, 0.0f,
> 0.0f, 0.0f, 1.0f,
> 1.0f, 0.0f, 1.0f,
> 1.0f, 1.0f, 1.0f,
> 0.0f, 1.0f, 1.0f,
> };
> int[] seq = {
> 4, 0, 1, 2, 3,
> 4, 1,5,6,2,
> 4, 5,4,7,6,
> 4, 4,0,3,7,
> 4, 0,1,5,4,
> 4, 3,2,6,7};
>
>
> // create a plane for clipping
> vtkPlane plane = new vtkPlane();
> plane.SetOrigin(0.0, 0.0, 0.5);
> plane.SetNormal(0, 0, 1);
>
> // create the box from points and sequence
> vtkPolyData polyData = new vtkPolyData();
> vtkPoints vtkPoints = new vtkPoints();
> vtkFloatArray d = new vtkFloatArray();
> d.SetJavaArray(points);
> d.SetNumberOfComponents(3);
> vtkPoints.SetData(d);
> polyData.SetPoints(vtkPoints);
> vtkCellArray vtkCells = new vtkCellArray();
> vtkIdTypeArray array = new vtkIdTypeArray();
> vtkIntArray intArray = new vtkIntArray();
> intArray.SetJavaArray(seq);
> array.DeepCopy(intArray);
> vtkCells.SetCells(seq.length, array);
> polyData.SetPolys(vtkCells);
>
> vtkClipClosedSurface clipClosedSurface = new
> vtkClipClosedSurface();
> vtkPlaneCollection planes = new vtkPlaneCollection();
> planes.AddItem(plane);
> clipClosedSurface.SetClippingPlanes(planes);
> clipClosedSurface.AddInputData(polyData);
> clipClosedSurface.Update(); // THIS CRASHES
>
> vtkDataSetMapper clipMapper = new vtkDataSetMapper();
>
> clipMapper.SetInputConnection(clipClosedSurface.GetOutputPort());
>
> boxActor = new vtkActor();
> boxActor.SetMapper(clipMapper);
> boxActor.GetProperty().SetColor(0.8900, 0.8100, 0.3400);
>
> }
>
>
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