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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