[vtkusers] vtkusers Digest, Vol 145, Issue 16

Mon May 16 13:47:53 EDT 2016

Look at
Common/ComputationalGeometry/Testing/Cxx/UnitTestParametricSpline.cxx

You can just
theImageRead =  reader->GetOutput();

On Mon, May 16, 2016 at 1:38 PM, Richard Frank <rickfrank at me.com> wrote:
> Sorry for the blank reply previous.
>
> The Tutorial is great but I don't see an example of the case I'm talking
> about.
>
> That is, returning a pointer to the caller in such a way that the caller
> doesn't  have to think about whether they need to explicitly delete.
>
> so, given a function  or method with a signature already returning a bool,
> and other code already dependent on that return type, I want to return the
> result of reading a file, for instance:
>
> bool ReadAnImageFile(vtkSmartPointer<vtkImageData> & theImageRead)
> {
>    vtkSmartPointer<vtkImageFileReader> reader =
> vtkSmartPointer<vtkImageFileReader>::New9);
>
> reader->SetFileName("Something.png");
> reader->Update();
>
> vtkImageData * image =  reader->GetOutput();  How to get image into
> theImageRead?
>
> // This seems to work
>
> theImageRead->DeepCopy(image);
>
> // but if it's really doing a deep copy and I have a large 3D .mha file or
> something
> // it will be slow.....is there a better way?
> }
>
>
> Thanks
>
> Rick
>
> On May 16, 2016, at 12:00 PM, vtkusers-request at vtk.org wrote:
>
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> Today's Topics:
>
> 1. why does the generated 3D model have borken part? (Liu_tj)
> 2. Re: SmartPointer reference? (Dan Lipsa)
> 3. Re: vtkBooleanOperationPolyDataFilter creates  non-manifold
> edges (Andras Lasso)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 16 May 2016 21:11:33 +0800 (CST)
> From: Liu_tj <tjlp at netease.com>
> To: vtkusers <vtkusers at vtk.org>
> Subject: [vtkusers] why does the generated 3D model have borken part?
> Message-ID: <7543d5b6.11.154b9b16f2f.Coremail.tjlp at netease.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> I used vtkMarchingCubes, vtkDecimatePro and vtkSmoothPolyDataFilter to
> generate 3D model for DICOM image. When it is firstly generated, the 3D
> model is fine (See the attached First.jpg). However, when I store it to STL
> file and use STLReader to read the STL file and display in vtkRenderWindow,
> it shows broken part (See loading.jpg). Why?
>
> Thanks
> Liu Peng
>
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> ------------------------------
>
> Message: 2
> Date: Mon, 16 May 2016 10:18:30 -0400
> From: Dan Lipsa <dan.lipsa at kitware.com>
> To: Richard Frank <rickfrank at me.com>
> Cc: VTK Users <vtkusers at vtk.org>
> Subject: Re: [vtkusers] SmartPointer reference?
> Message-ID:
>  <CADwGrVq4_tna0Oph5Tqn+m=6Uk4GTn8GJuGBvdfZ8XudbjcsBA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Does this help?
> http://www.vtk.org/Wiki/VTK/Tutorials/SmartPointers
>
> What exactly is the problem you are seeing?
> Dan
>
>
> On Fri, May 13, 2016 at 7:22 PM, Richard Frank <rickfrank at me.com> wrote:
>
>
> Hi,
>
>
> Is it possible to return a smart pointer by reference?
>
>
> I'd like to return an image as a parameter, rather than a return type but
>
> nothing seems to be happy.
>
>
> for instance
>
>
> bool SomeFunction(vtkSmartPointer<vtkImageData> & outImage)
>
> {
>
> vtkSmartPointer<vtkImageReader> r =
>
> vtkSmartPointer<vtkImageReader>::New();
>
> r->SetFileName("Path");
>
> r->Update();
>
> // What next?
>
>
> return true;
>
> }
>
>
> I though Take was a possible choice
>
>
> outImage = vtkSmartPointer<vtkImageData>::Take(r->GetOutput());
>
>
> but no happiness there.
>
>
> Any solution?
>
>
> Thanks
>
>
> Rick
>
>
>
>
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> ------------------------------
>
> Message: 3
> Date: Mon, 16 May 2016 15:14:15 +0000
> From: Andras Lasso <lasso at queensu.ca>
> To: normanius <juch at zhaw.ch>, "vtkusers at vtk.org" <vtkusers at vtk.org>
> Subject: Re: [vtkusers] vtkBooleanOperationPolyDataFilter creates
>    non-manifold        edges
> Message-ID:
>
> <DM2PR07MB350120A5448638CA86B2746D8770 at DM2PR07MB350.namprd07.prod.outlook.com>
>
> Content-Type: text/plain; charset="us-ascii"
>
> but it cannot be that one has to do that extra cleanup step after every such
> basic operation, right?!
>
>
> Performing Boolean operation on meshes may sound easy but is an extremely
> difficult problem. It would be nice if VTK had a solution that worked
> reliably, so it's great that you submit reports on specific problems you
> find.
>
> However, I'm not sure if there is anybody who could work on fixing these
> issues in the near future. So, if you cannot fix them yourself then most
> likely your best bet is to work around the problem by converting all meshes
> to images, combining them, and regenerating a mesh.
>
> Andras
>
> -----Original Message-----
> From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of normanius
> Sent: May 15, 2016 4:54 AM
> To: vtkusers at vtk.org
> Subject: [vtkusers] vtkBooleanOperationPolyDataFilter creates non-manifold
> edges
>
> Hi all
>
> This is an issue that has been raised already. But I wanted to ask whether
> there is a workaround or whether it actually is a bug that has been properly
> reported.
>
> Find attached sample code which reproduces the problem: If I union two
> overlapping, watertight objects A and B, the resulting object C very likely
> won't be watertight (it shows border edges and non-manifold edges).
>
> The sample code in essence does this:
> - create cylinder A as a vtk.vtkCylinderSource
> - create sphere B as a vtk.vtkSphereSource
> - extract triangles from A and B
> - create union C with vtk.vtkBooleanOperationPolyDataFilter() with
> SetOperationToUnion()
>
> The problem occurs also, if I use other objects than cylinders or spheres.
> The problem occurs also, if I "clean/condition" the surfaces of A and B
> before calculating the union. (I tried vtkCleanPolyData(),
> vtkFillHolesFilter() and addition of small noise on the vertices, which
> sometimes helps to regularise operations on objects)
>
> In the following two screenshots. The first one indicates the two objects to
> union. The second one shows the result, with the non-manifold and border
> edges.
>
> <http://vtk.1045678.n5.nabble.com/file/n5738088/input.png>
> <http://vtk.1045678.n5.nabble.com/file/n5738088/result.png>
>
> Because I often make use of vtkBooleanOperationPolyDataFilter, the problem
> is really annoying for me. That's why I thought to seek help in the
> community. Any ideas of how to handle this?
> Cleaning the surface (set flag cleanOutputSurface=True in my code) does
> improve the situation in some cases - but it cannot be that one has to do
> that extra cleanup step after every such basic operation, right?!
>
> By the way: this problem has been reported already: see here
> <http://vtk.1045678.n5.nabble.com/Non-manifold-triangles-after-running-vtkBooleanOperationPolydataFilter-td5713964.html>
> and here
> <http://vtk.1045678.n5.nabble.com/Broken-surfaces-for-vtkBooleanOperationPolyDataFilter-Bug-td5735413.html>
> reproduced_problem.py
> <http://vtk.1045678.n5.nabble.com/file/n5738088/reproduced_problem.py> .
>
> Thanks for any inputs from your side.
>
>
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/vtkBooleanOperationPolyDataFilter-creates-non-manifold-edges-tp5738088.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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> End of vtkusers Digest, Vol 145, Issue 16
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