[vtk-developers] Creating a vtkPolyData from points and polygons

[Bill Lorensen]

You have the arguments swapped on these lines:

 polygon->GetPointIds()->SetId(model_->get_faces_()[i] - 1.0, 0);
 polygon->GetPointIds()->SetId(model_->get_faces_()[i + 1] - 1.0, 1);
 polygon->GetPointIds()->SetId(model_->get_faces_()[i + 2] - 1.0, 2);

On Wed, Apr 9, 2014 at 9:57 AM, Mikael Brudfors <mbrudfors at ece.ubc.ca> wrote:
> Hello,
>
>
>
> I hope someone can help me with this very simple issue.
>
>
>
> I have a surface stored in two double * as points and polygons (faces) which
> I can access using moved_shape_ and get_faces_(). I would like to read this
> into a vtkPolyData.
>
>
>
> This is how I thought of doing it:
>
>
>
>        vtkSmartPointer<vtkPoints> points =
> vtkSmartPointer<vtkPoints>::New();
>
>        for (int i = 0; i < model_->get_moved_shape_rows_(); i+=3)
>
>        {
>
>               double point[] = {model_->moved_shape_[i],
> model_->moved_shape_[i+1], model_->moved_shape_[i+2]};
>
>               points->InsertNextPoint(point);
>
>        }
>
>
>
>        vtkSmartPointer<vtkCellArray> polygons =
> vtkSmartPointer<vtkCellArray>::New();
>
>        for (int i = 0; i < model_->get_faces_rows_(); i+=3)
>
>        {
>
>               vtkSmartPointer<vtkPolygon> polygon =
> vtkSmartPointer<vtkPolygon>::New();
>
>
>
>               polygon->GetPointIds()->SetNumberOfIds(3);
>
>               polygon->GetPointIds()->SetId(model_->get_faces_()[i] - 1.0,
> 0);
>
>               polygon->GetPointIds()->SetId(model_->get_faces_()[i + 1] -
> 1.0, 1);
>
>               polygon->GetPointIds()->SetId(model_->get_faces_()[i + 2] -
> 1.0, 2);
>
>
>
>               polygons->InsertNextCell(polygon);
>
>        }
>
>
>
>        vtkSmartPointer<vtkPolyData> polygonPolyData =
> vtkSmartPointer<vtkPolyData>::New();
>
>        polygonPolyData->SetPoints(points);
>
>        polygonPolyData->SetPolys(polygons);
>
>
>
> But it crashes at the line, polygons->InsertNextCell(polygon), at the first
> iteration of the second for-loop. Seems like a memory allocation issue.
>
>
>
> Call stack:
>
>
>
>>             msvcr100d.dll!_heap_alloc_base(unsigned __int64 size=84)  Line
>> 55       C
>
>                msvcr100d.dll!_heap_alloc_dbg_impl(unsigned __int64 nSize=32,
> int nBlockUse=1, const char * szFileName=0x0000000000000000, int nLine=0,
> int * errno_tmp=0x000000000012e910)  Line 431 + 0xa bytes        C++
>
>                msvcr100d.dll!_nh_malloc_dbg_impl(unsigned __int64 nSize=32,
> int nhFlag=0, int nBlockUse=1, const char * szFileName=0x0000000000000000,
> int nLine=0, int * errno_tmp=0x000000000012e910)  Line 239 + 0x22 bytes
> C++
>
>                msvcr100d.dll!_nh_malloc_dbg(unsigned __int64 nSize=32, int
> nhFlag=0, int nBlockUse=1, const char * szFileName=0x0000000000000000, int
> nLine=0)  Line 302 + 0x2a bytes     C++
>
>                msvcr100d.dll!_malloc_dbg(unsigned __int64 nSize=32, int
> nBlockUse=1, const char * szFileName=0x0000000000000000, int nLine=0)  Line
> 160 + 0x22 bytes     C++
>
>                msvcr100d.dll!realloc_help(void *
> pUserData=0x0000000000000000, unsigned __int64 *
> pnNewSize=0x000000000012ea68, int nBlockUse=1, const char *
> szFileName=0x0000000000000000, int nLine=0, int fRealloc=1)  Line 705 + 0x21
> bytes             C++
>
>                msvcr100d.dll!_realloc_dbg(void *
> pUserData=0x0000000000000000, unsigned __int64 nNewSize=32, int nBlockUse=1,
> const char * szFileName=0x0000000000000000, int nLine=0)  Line 1040 + 0x29
> bytes             C++
>
>                msvcr100d.dll!realloc(void * pUserData=0x0000000000000000,
> unsigned __int64 nNewSize=32)  Line 60 + 0x20 bytes          C++
>
>
> vtkCommon.dll!vtkDataArrayTemplate<__int64>::ResizeAndExtend(__int64 sz=4)
> Line 355 + 0x1e bytes                C++
>
>
> vtkCommon.dll!vtkDataArrayTemplate<__int64>::WritePointer(__int64 id=0,
> __int64 number=4)  Line 865 + 0xf bytes             C++
>
>                vtkCommon.dll!vtkIdTypeArray::WritePointer(__int64 id=0,
> __int64 number=4)  Line 129 + 0x3c bytes  C++
>
>                vtkFiltering.dll!vtkCellArray::InsertNextCell(__int64 npts=3,
> const __int64 * pts=0x00000000030c2420)  Line 249 + 0x1f bytes
> C++
>
>                vtkFiltering.dll!vtkCellArray::InsertNextCell(vtkCell *
> cell=0x00000000030e2cc0)  Line 294              C++
>
>
>
> Any help would be greatly appreciated!
>
>
>
> Thank you,
>
>
>
> Mikael
>
>
>
>
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