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Tangent to a spline

Question asked by Pet Peever on Aug 14, 2012
Latest reply on Aug 21, 2012 by Roland Schwarz


In this file, I have a given spline, which is fixed and the tangent at the origin.


(Btw, I am wondering why I can fix the tangent at origin : if the spline is fixed, the tangent at any point too, but it's not the matter of my post)


I want to define a segment, being tangent at the origin.


So, I draw a segment, one point at origin, the other free, and I define a tangent property.


And I get what is on my screen.

How can I build this totally elementary construction ?


OK, I can declare some colinearity with the tangent of the spline.


But this kind of behaviour is surely totally normal ?