> FractRacer:
> Here's a visualization of the goal & problem.
>
> I'm sure I must simply be doing something slightly wrong when I compute a vector
> to rotate around, or a normal value, or something.
> It all looks fine on paper - so it should work!   :D
>
> If the red torus is the rim of an ice cream cone, then the green sphere should
> sit in it perfectly, in full contact, like a scoop of ice cream.
>

>

I will take some times to see your code.
If I understand, the point D is not in the same plane as the triangle, 
the torus is - but I may be wrong - the equator of the sphere on which D 
is.

Lionel

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