[vtkusers] vtkSpline curve

[Dean Inglis]

Hi

how do you draw the spline?  Are you using one of the vtk widgets?
If you have the vtkPolyData that represents the spline, 
you can get the points that make it up and then do basic vector
mathematics to calculate tangent and normal vectors.

>The problem is i draw a spline curve on an image from points i give and i 
>want to get the normal or tangent at point in the curve. i draw the curve 
>using vtkSplineCurve.

Not sure what you mean here...

>another problem i have plane curve and i want roll it off on a plane.
                              
regards,
Dean