> I have been playing with your macro and I have the following question, as 
> I am at a loss about how to solve it myself (see the image in p.b.i.).
>
> I scaled here the cones to a flat shape. What I would like is to always 
> have the eliptic bases oriented horizontally, whatever their location, not 
> like in the image, where part of them are oriented vertically. How could 
> that be achieved with your macro? I experimented a bit and read the docs, 
> but I am at a loss.

Trace and the RandOnSurface macro only return a point and a normal.

You could ignore the vertical portion of the normal and force some
object to be horizontal in respect to the horizon.
Point_At_Trans(vnormalize(<Norm.x,0,Norm.z>))
but you would need to decide what to do if the normal is vertical
or it might error out.

However, I think what you intend is to follow the shape of the object?
A normal isn't enough to generate info about how the surface
shape slopes nearby to some random point. You could trace nearby
points and rotate based on that perhaps.

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