Warp <war### [at] tagpovrayorg> wrote:
> inside a "function" block the language used is
> completely separate and distinct from the SDL. It has nothing to do
> with the SDL.
>
>   Your #declare lines are SDL and thus are *not* parsed as part of your
> function. They are evaluated as SDL.

Do you mean that you cannot #declare temporary variables in a function?

#declare densityfunc = function( px, py, pz) {
  #declare pxVal = px;
  #declare pyVal = py;
  atan2(pyVal, pxVal)
}

You can only use the values directly?

#declare densityfunc = function( px, py, pz) {
  atan2(py, px)
}

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