I try to calculate a mesh2 with math functions. I can't get the code to run. It
stops at the bracket } of the vertex_vectors statement (after the #debug
statement). Probably I do a beginners error. Can you help me?

Here the code:

//
// Meash2test
//

//


#version 3.7;

#include "colors.inc"    // The include files contain
#include "stones.inc"    // pre-defined scene elements

  background { color Cyan }

  light_source { <2, 4, -3> color White}

#declare r = 7;
#declare phi = -1.5;


  camera {
    location <r*cos(phi), 1, r*sin(phi)>
    look_at  <0, 1,  2>
  }


#declare n = 3;
#declare m = 3;
#declare vec = n * m;
#declare f = 2 * (n - 1) * (m - 1);

#declare r = 0.2;
#declare phi = 3.14 / 10;

mesh2 {
    vertex_vectors {
        vec

#declare i = 0;
#declare j = 0;
#while(i<n)
    #while(j<m)
        #declare x1 = pow(i*r,5) * cos(5 * j * phi) - i * r * cos(j * phi);
        #declare y1 = pow(i * r,5) * sin(5 * j * phi) - i * r * sin(j * phi);
        #declare z1 = i*r + j*phi;

        ,<x1,y1,z1>

        #declare j = j + 1;
    #end
    #declare i = i + 1;
#end

#debug concat("i=",str(i,0,0), "  j=",str(j,0,0))
    }
    face_indices {
        f

#declare i = 1;
#declare j = 0;
#while(i < n)
    #while(j < m)
        #declare k = i * n + j;
        #declare k1 = k - m;
        #declare k2 = k - m + 1;
        #declare k3 = k + 1;

        ,<k,k1,k2>, <k, k2, k3>


        #declare j = j + 1;
    #end
    #declare i = i + 1;
#end

    }
    pigment {rgb 1}
}

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