I've made a basic macro (with the help of a tutorial)that randomly places
objects (in this case spheres) in a given space. The trouble is the
tutorial didn't tell me how to stop the spheres from touching. Can anyone
help? I've included the macro below.

#declare floater = sphere{<0,.5,0>, 1}
#declare thingy_red = <1,0,0>;
#declare floater_count = 20;
#declare Locations = seed(1);
#while (floater_count > 0)
  #declare x_loc = rand(Locations)*7-1;
  #declare y_loc = rand(Locations)*7-1;
  #declare z_loc = rand(Locations)*7-1;
object{floater
      pigment{color thingy_red}
      translate <x_loc,y_loc,z_loc>
      }
  #declare floater_count = floater_count - 1;
#end

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