[vtkusers] Convert vtkUnstructuredGrid to vtkPolyData

[mandalin]

Greetings !

*So, from buildings and terrain information, I have populated a
vtkUnstructuredGrid with VTK_POLYGON as follows :*

//Store the positions of the vertices
    vtkPoints *GeometryVertices = vtkPoints::New();
    
    GeometryVertices->Allocate(NumVertices);
    
    for(int i=0; i<NumVertices; i++)
    { 
        GeometryVertices->InsertPoint(i, unique_corners[i].x,
unique_corners[i].y, unique_corners[i].z);
    }
    
    //Makeing an array of ID's for each polygon
    vtkIdList** pointIDs;
    pointIDs= new vtkIdList *[NumWalls];

    int cornersperwall;
    
    for(int wallind=0; wallind<NumWalls; wallind++)
    {   cornersperwall=walls[wallind].corners.size();
       // std::cout&lt;&lt;&quot;Corners in this wall
&quot;&lt;&lt;cornersperwall&lt;&lt;std::endl;
        pointIDs[wallind]= vtkIdList::New();
        
        for(int cornerind=0; cornerind&lt;walls[wallind].corners.size();
cornerind++)
        {  
           
pointIDs[wallind]->InsertNextId(walls[wallind].corner_indices[cornerind]);
        }
    }
    

    //Make the Polygons
    vtkUnstructuredGrid * ugridGeom= vtkUnstructuredGrid::New();
    ugridGeom->Allocate(totnumcnx+10);
    
    for(int wallind=0; wallind<NumWalls; wallind++)
    {   //if(wallind==9) //excludes ground planes
        //{
            for(int cornerind=0; cornerind&lt;walls[wallind].corners.size();
cornerind++)
            {   ugridGeom->InsertNextCell(VTK_POLYGON, pointIDs[wallind]);
            }
        //}
    }


*NOW, I would like to convert this to vtkPolyData so that I may later probe
and interpolate*

*When I use *

        vtkGeometryFilter * geometryFilter =  vtkGeometryFilter::New();
        geometryFilter->SetInput(ugridGeom);
        geometryFilter->Update(); 
        
        vtkPolyData* polydata = geometryFilter->GetOutput();
        
        std::cout << "Output has " << polydata->GetNumberOfPoints() << "
points." << std::endl;

*
I find that there are 0 points. *


Any suggestions ?

Thanks in advance,
~Amanda

--
View this message in context: http://vtk.1045678.n5.nabble.com/Convert-vtkUnstructuredGrid-to-vtkPolyData-tp4982862p4982862.html
Sent from the VTK - Users mailing list archive at Nabble.com.