trace should do it, it's not even heard to understand, try it.

Rich wrote:
> 
>   This may already exist; if so a URL would be welcome!  What I'd like to
> be able to do is place objects on the surface of another object.  The macro
> should be able to place an object (b) anywhere on the other object (a),
> rotated according (I guess) to the normal of (a) at the point (b) will be
> placed.  I'm mostly interested in spheres and torii for (a), but ones that
> have been scaled in various axis PRIOR to having (b) placed.  If the macro
> could handle any of POV's primitives, that would be cool too.  It would
> also be cool to have some control over where (b) is placed on (a); with a
> sphere I suppose a vector from the center could be used.  No idea how a
> torus would handle it... maybe a flag to use the first or second surface
> hit?
> 
>   What I'm thinking of is something like this:
> 
> #declare B = [definition of object to be placed on surface of A]
> #declare A = [definition of object that will have B placed on it]
> #declare loop = 0;
> #declare C = union {
>   #while (loop < 11)
>     Place(A, B, [vector??], [first or second??], [random])
>     #declare loop = loop + 1;
>   #end
> }
> 
>   Is this an impossible dream??  I have looked at MegaPOV's trace function,
> but it goes over my head even if I stand up while I read about it.  <smile>
> If it's possible and an explanation of how to go about doing it were
> available I could take a hack at it myself.
> 
> --
> Rich Allen
> (Remove SPAM from my address to reply by e-mail)

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