I'm new at Povray.

I use the following code in order to find intersection of 30 planes and 19
quadratics, plane normals and points are given in 2-dimensional array p and
q, coefficients of quadratics given in 2-dimensional array qq.

But I got the following error message: in qq[j]: "array subscript out of
range"

Maybe it is trivial but I didn't understand why? Can somebody help me?

  #declare i=0;
  #declare j=0;


  #while (i<31)


  intersection{

  plane
{<p[i][0],p[i][1],p[i][2]>,p[i][0]*q[i][0]+p[i][1]*q[i][1]+p[i][2]*q[i][2]
}


  quadric
  {

<qq[j][2],qq[j][4],qq[j][6]>,<qq[j][7],qq[j][8],qq[j][9]>,<qq[j][1],qq[j][3],qq[j][5]>,qq[j][0]

  }

  }


  #declare i=i+1;

    #if (j<20)
      #declare j=j+1;
  #end

  #end

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