[vtkusers] vtkSpline

[Jérôme]

Hi,

If you can enclose your points in a vtkPolyData, you may want to
vtkSplineFilter.

Hope that helps

Jerome

2009/9/5 Ho Ngoc Ha <ha_lennon at yahoo.com>

> Hi,
>
> I have a set of points, I just need to find a spline that pass through all
> of those points and generate a number of output points.
>
> Here is what I did
>
> int numberOfInputPoints = points->GetNumberOfPoints();
>
>     vtkCardinalSpline* aSplineX;
>     vtkCardinalSpline* aSplineY;
>     vtkCardinalSpline* aSplineZ;
>
>     aSplineX = vtkCardinalSpline::New();
>     aSplineY = vtkCardinalSpline::New();
>     aSplineZ = vtkCardinalSpline::New();
>
>     for (int i=0; i<numberOfInputPoints; i++)
>     {
>       double x = points->GetPoint(i)[0];
>       double y = points->GetPoint(i)[1];
>       double z = points->GetPoint(i)[2];
>           aSplineX->AddPoint(i, x);
>           aSplineY->AddPoint(i, y);
>           aSplineZ->AddPoint(i, z);
>
>     }
>
>     vtkPoints* polypoints = vtkPoints::New();
>
>
>     int numberOfOutputPoints = 20;
>
>        double t;
>        for (int i=0; i<numberOfOutputPoints; i++)
>     {
>       t
>
> =(double)(numberOfInputPoints-1)/(double)(numberOfOutputPoints-1)*(double)i;
>       std::cout << "t: " << t << std::endl;
>       polypoints->InsertNextPoint(aSplineX->Evaluate(t),
> aSplineY->Evaluate(t),
>                        aSplineZ->Evaluate(t));
>     }
>
>
> I thought the newly generated points will be stored in polypoints? But when
> I checked it, it only contains the first and the last point of my input
> points.
>
> I am new to vtk so please help me. Thank you very much
>
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