<div>Hi everybody,</div>  <div>&nbsp;</div>  <div>I managed to draw a curve passing a group of points using&nbsp;vtkCardinalSpline class....Now i'd like to know how to draw&nbsp;one or more parallel curves to&nbsp;this curve...and how to draw a&nbsp;line normal to the tangent of this curve at some point?.....</div>  <div>&nbsp;</div>  <div>i&nbsp;know how to do it mathimatically using&nbsp;equation of the curve....but i need somebody to tell me how to do it on vtk....</div>  <div>&nbsp;</div>  <div>your help is really appreciated....</div>  <div>Mohamed&nbsp;</div><p>&#32;

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