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Helix on a surface

Question asked by Philippe Carette on Aug 24, 2011
Latest reply on Aug 24, 2011 by Philippe Carette

Is there a way to create a helix, on a non necessarly ruled surface, to have this helix, having a tangent vector being always with the same angle (horitonzal plane, plane_tangent_normal) ?

 

Here, I first construct a horizontal spiral, and I project it on the surface, but it's not totally statisfactory, because vertical distance between 2 revolutions isn't constant.

 

Tx a lot for your help.

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