[vtkusers] splines

[dean.inglis at camris.ca]

you didn't define any points:

 //Generate the polyline for the spline.
 spline_points = vtkPoints::New();
 spline_points->SetNumberOfPoints( static_cast<vtkIdType>(numberOfOutputPoints) );

you need to also do:

spline_points->SetPoint(i,somethingX,somethingY,somethingZ);

or,

double somethingXYZ[3];
spline_points->SetPoint(i,somethingXYZ);

Dean