Hi,

I'm trying to create a function that gets some values by a spline. But when I'm
trying to render the scene, the following error occurs:

"Expected 'operand', spline identifier found instead"

The simplest scene in which I found this error is something like that:

// First of all declare a spline - a circle made of 8 points with cubic spline
// I don't have any problems with this spline in other scenes
#declare SPL =
  spline {
    cubic_spline


    #declare SPLI=-1/8;
    #while (SPLI<=1+1/8)
    SPLI, <sin(2*pi*SPLI),0,cos(2*pi*SPLI)>
    #declare SPLI=SPLI+1/8;
    #end
  }


// now declare a function that calculates the average (arithmetic mean) of the
// x-values of the spline. "Exactness" says how many points I want to use.

 #declare xAverage=function(Exactness) {
 sum(i,0,Exactness,
     SPL(i/Exactness).x  // here the error occurs
    )
/(Exactness+1)
}


// end of file

Where is my mistake? Could you please help me? Is the sum the reason?
I'm using POV-Ray 3.7 (the beta version).

Thanks,
Sven

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