Josh English wrote:

> It's not arcsin, but arctangent. If you rotate another object by
> degrees(atan2(-0.5,1))*z you will get the right angle.

Ooops ! Right !  Why did I use sinus ?  Now that I think about
it, I know that I pictured (in my mind) the trigonometric circle
with the tangent drawn in dots.

Fabien.
 ..slapping myself..

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