I have been fooling around with MegaPov a bit lately and I've come up
against a brick wall. I am trying to simulate the buoyant force of water,
but I can't find out how to make a field with Vector_Function() that is
dependent on the position of masses. So far all I've seen is the example
Vector_Function(function{0}function{-1}function{0}), which is a constant
downward force. My code so far is this:

Before the mechsim{...} block
#declare Fn_Vector = function(x,y,z) {
  Vector_Function(
    function{0}
    function{
      #if (y>RADIUS)
        0
      #else
        #if (y<-RADIUS)
          9.81*4/3
        #else
          9.81*pi*(((y-r)*r*r-1/3*pow(y-r,3))-(-r*r*r-1/3*pow(-r,3)))
        #end
      #end
    }
    function{0}
  )
}

In the mechsim{...} block
field {
  function {
    Fn_Vector(x,y,z)
  }
}

When I try to render it throws an error because it is treating the "y" in
the first #if as <0,1,0> and not the argument of the function. I have tried
replacing x, y, and z with a, b, and c, but then it claims that b is an
uninitialized identifier. What am I doing wrong? Thanks in advance!

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