Yes!  Passing an array of vectors to a spline is exactly what I mean.
Consider this:

#declare MyVectors=array[100]
#declare MySize=array[100]

#declare step_value=.01;

#declare my_index=0;
#while (my_index<1)
  #declare my_radius=my_index*15;
  #declare my_heading=sin(my_index*12)*pi/2;
  #declare my_elevation=sin(my_index*28)*pi/32;
  #declare my_x=cos(my_heading)*my_radius;
  #declare my_z=sin(my_heading)*my_radius;
  #declare my_y=sin(my_elevation)*my_radius;
  #declare my_sphere_size=.5+sin(my_index*35)*.2;
  sphere {<my_x,my_y,my_z>,my_sphere_size
    pigment {color rgb <.8,.7,.9>}
  }
  #declare MyVectors[my_index*100]=<my_x, my_y, my_z>;
  #declare my_index=my_index+step_value;
#end

This creates an array of vectors MyVectors[].  I could of course get things
smooth by using spheres and cylinders and decreasing the step_value, but how
much better if I could do something like

#declare myspline=spline{
  linear_spline
  #declare index=0;
  #while (index<100)
    MyVectors[index]
    #declare index=index+1;
  #end
}

This does NOT work!  It returns with ERROR: Spline must have at least one
entry.  The work-around I have been using is to use Python to generate in
it's shell window, copy them to the clipboard, and paste them into my POV
code directly.  Clunky, but it works.






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