[vtkusers] issue aobut point cloud data visulization!

[Shashwath T.R.]

Hi,

On Wed, Jun 10, 2009 at 11:54 AM, njuzg <guangz at u.washington.edu> wrote:

>
> ...
>  vtkCellArray* pts = vtkCellArray::New();
> // pts->InsertNextCell(1);
>  for(int i=0; i<xcoord_array.size();++i)
>          pts->InsertCellPoint(i);
> ...
> vtkPolyData *polydata=vtkPolyData::New();
>   polydata->SetPoints(points);
>   polydata->SetPolys(pts);
>   polydata->GetPointData()->SetScalars(scalars);



>From the above lines, it looks like you're trying to add the points to a set
of polys in the polydata. Try adding to vertices instead.

What I usually do for point clouds is something like this:

vtkPolyData * polyData = vtkPolyData::New();
vtkPoints * points = vtkPoints::New();
polyData->SetPoints(points);
polyData->Allocate();

...

vtkIdType id = points->InsertNextPoint(myPt);
polyData->InsertNextCell(VTK_VERTEX, 1, &id);

This usually works quite decently...

Regards,
Shash
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