[vtkusers] A simple question about vtkPolyData

[Dai Shuo]

Hi Sebastien,
	Thank you for the detailed reply. It works well.


>try :
>
>int index;
>for (int i=0;i<vtkPolyData->GetNumberOfPolys();i++,index++) {
>
>    // looking for polygon cells / quad cells or triangle cells, you can
>remove some types if
>    //you want but beware that you need to count the number of this special
>type cells for the
>    //loop, or getnumberofpolys will loop too far in the cell and a memory
>error will occure.
>
>    while (vtkPlyData->GetCellType(index) != VTK_POLYGON
>            && (idem) != VTK_QUAD    //which is also a poly
>            && (idem) != VTK_TRIANGLE   //idem, I can forget some types,
>refer to vtkCellTypes
>                                        //for more types
>            ) index++;
>
>    vtkIdList *points = vtkIdList::New();
>    vtkPolyData::GetCellPoints(index, points);
>
>// points contained in "points" are the current cell points, do whatever you
>want with it.
>// you can retrieve them by looping for points->GetNumberOfIds() in
>// vtkPolyData->GetPoint(points->GetId(x)); for each polygon/quad/triangle
>cell.
>}
>
>you can tweak this for use with get polys, which should be simpler:
>once you have your cell array, you can loop in each cell and do the same job
>:
>loop for number of ids (getpointids) and do a getcellpoints on the
>vtkpolydata
>
>
>Hope this helps
>
>Sebastien Maraux
>
>----- Original Message -----
>From: "Dai Shuo" <dai_shuocn at 163.com>
>To: "vtk" <vtkusers at public.kitware.com>
>Sent: Wednesday, June 05, 2002 3:12 AM
>Subject: [vtkusers] A simple question about vtkPolyData
>
>
>Hi, all
>    I have a vtkPolyData, and I know it's composed of some polygons.
>Now I want to get the point list of each polygon, how?
>vtkPolyData::GetPolys()
>seems helpful, but I don't know how to deal with a vtkCellArray which it
>returns.
>Please give me a solution. Thank you very much!
>
>　　　　　　　　Dai Shuo
>　　　　　　　　dai_shuocn at 163.com
>　　　　　　　　　　2002-06-05
>
>
>
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　　　　　　　　Dai Shuo
　　　　　　　　dai_shuocn at 163.com
　　　　　　　　　　2002-06-05