quiver: specifying arrow orientation?

[CdeMills]

Hello,

consider the graph produced from the enclosed script
http://octave.1599824.n4.nabble.com/file/n3049074/curve3d.m curve3d.m .
There is a 3D spiral in blue, with a few gradient vectors in green. This
spiral is projected in the y-z plane by letting x=0 everywhere, this is the
black curve. Then the red arrows are drawn, the gradient in the y-z plane.
As the arrows are partly in the x plane, the x axis is displaced. Would it
be possible to add the ability to rotate the arrows in the latter case, in
such a way they are totally in the y-z plane ? David ?

Regards

Pascal
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