typedef VECTOR XYZ;

typedef struct {
   XYZ* p[3];
} TRIANGLE;

typedef struct {
   XYZ p[8];
   double val[8];
} GRIDCELL;



/*
   Linearly interpolate the position where an isosurface cuts
   an edge between two vertices, each with their own scalar value
*/
XYZ* VertexInterp( double isolevel, XYZ* p1, XYZ* p2, double valp1, double valp2 )
{
   double mu;
   XYZ* p = vector(0,0,0);

   if (abs(isolevel-valp1) < 0.00001)
      return(p1);
   if (abs(isolevel-valp2) < 0.00001)
      return(p2);
   if (abs(valp1-valp2) < 0.00001)
      return(p1);
   mu = (isolevel - valp1) / (valp2 - valp1);
   p->x = p1->x + mu * (p2->x - p1->x);
   p->y = p1->y + mu * (p2->y - p1->y);
   p->z = p1->z + mu * (p2->z - p1->z);

   return(p);
}



int edgeTable[256]={
0x0  , 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c,
0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
0x190, 0x99 , 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c,
0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
0x230, 0x339, 0x33 , 0x13a, 0x636, 0x73f, 0x435, 0x53c,
0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
0x3a0, 0x2a9, 0x1a3, 0xaa , 0x7a6, 0x6af, 0x5a5, 0x4ac,
0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c,
0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0xff , 0x3f5, 0x2fc,
0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x55 , 0x15c,
0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0xcc ,
0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc,
0xcc , 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c,
0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc,
0x2fc, 0x3f5, 0xff , 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c,
0x36c, 0x265, 0x16f, 0x66 , 0x76a, 0x663, 0x569, 0x460,
0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac,
0x4ac, 0x5a5, 0x6af, 0x7a6, 0xaa , 0x1a3, 0x2a9, 0x3a0,
0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c,
0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x33 , 0x339, 0x230,
0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c,
0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x99 , 0x190,
0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c,
0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x0   };


int triTable[4096] = 
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1,
3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1,
3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1,
3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1,
9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1,
9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1,
2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1,
8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1,
9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1,
4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1,
3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1,
1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1,
4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1,
4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1,
9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1,
5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1,
2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1,
9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1,
0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1,
2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1,
10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1,
4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1,
5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1,
5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1,
9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1,
0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1,
1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1,
10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1,
8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1,
2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1,
7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1,
9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1,
2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1,
11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1,
9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1,
5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1,
11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1,
11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1,
1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1,
9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1,
5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1,
2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1,
0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1,
5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1,
6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1,
0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1,
3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1,
6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1,
5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1,
1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1,
10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1,
6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1,
1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1,
8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1,
7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1,
3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1,
5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1,
0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1,
9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1,
8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1,
5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1,
0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1,
6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1,
10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1,
10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1,
8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1,
1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1,
3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1,
0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1,
10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1,
0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1,
3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1,
6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1,
9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1,
8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1,
3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1,
6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1,
0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1,
10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1,
10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1,
1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1,
2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1,
7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1,
7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1,
2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1,
1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1,
11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1,
8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1,
0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1,
7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1,
10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1,
2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1,
6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1,
7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1,
2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1,
1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1,
10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1,
10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1,
0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1,
7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1,
6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1,
8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1,
9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1,
6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1,
4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1,
10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1,
8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1,
0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1,
1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1,
8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1,
10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1,
4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1,
10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1,
5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1,
11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1,
9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1,
6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1,
7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1,
3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1,
7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1,
9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1,
3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1,
6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1,
9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1,
1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1,
4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1,
7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1,
6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1,
3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1,
0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1,
6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1,
0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1,
11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1,
6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1,
5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1,
9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1,
1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1,
1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1,
10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1,
0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1,
5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1,
10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1,
11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1,
9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1,
7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1,
2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1,
8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1,
9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1,
9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1,
1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1,
9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1,
9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1,
5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1,
0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1,
10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1,
2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1,
0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1,
0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1,
9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1,
5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1,
3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1,
5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1,
8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1,
0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1,
9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1,
0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1,
1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1,
3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1,
4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1,
9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1,
11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1,
11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1,
2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1,
9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1,
3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1,
1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1,
4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1,
4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1,
0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1,
3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1,
3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1,
0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1,
9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1,
1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};

/*
int triTable[4096] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  1,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  8,  3,  9,  8,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  3,  1,  2,  10,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  2,  10, 0,  2,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 2,  8,  3,  2,  10, 8,  10, 9,  8, -1, -1, -1, -1, -1, -1, -1,
 3,  11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  11, 2,  8,  11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  9,  0,  2,  3,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  11, 2,  1,  9,  11, 9,  8,  11,-1, -1, -1, -1, -1, -1, -1,
 3,  10, 1,  11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  10, 1,  0,  8,  10, 8,  11, 10,-1, -1, -1, -1, -1, -1, -1,
 3,  9,  0,  3,  11, 9,  11, 10, 9, -1, -1, -1, -1, -1, -1, -1,
 9,  8,  10, 10, 8,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  7,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  3,  0,  7,  3,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  1,  9,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  1,  9,  4,  7,  1,  7,  3,  1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10, 8,  4,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  4,  7,  3,  0,  4,  1,  2,  10,-1, -1, -1, -1, -1, -1, -1,
 9,  2,  10, 9,  0,  2,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1,
 2,  10, 9,  2,  9,  7,  2,  7,  3,  7,  9,  4, -1, -1, -1, -1,
 8,  4,  7,  3,  11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 11, 4,  7,  11, 2,  4,  2,  0,  4, -1, -1, -1, -1, -1, -1, -1,
 9,  0,  1,  8,  4,  7,  2,  3,  11,-1, -1, -1, -1, -1, -1, -1,
 4,  7,  11, 9,  4,  11, 9,  11, 2,  9,  2,  1, -1, -1, -1, -1,
 3,  10, 1,  3,  11, 10, 7,  8,  4, -1, -1, -1, -1, -1, -1, -1,
 1,  11, 10, 1,  4,  11, 1,  0,  4,  7,  11, 4, -1, -1, -1, -1,
 4,  7,  8,  9,  0,  11, 9,  11, 10, 11, 0,  3, -1, -1, -1, -1,
 4,  7,  11, 4,  11, 9,  9,  11, 10,-1, -1, -1, -1, -1, -1, -1,
 9,  5,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  5,  4,  0,  8,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  5,  4,  1,  5,  0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 8,  5,  4,  8,  3,  5,  3,  1,  5, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10, 9,  5,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  0,  8,  1,  2,  10, 4,  9,  5, -1, -1, -1, -1, -1, -1, -1,
 5,  2,  10, 5,  4,  2,  4,  0,  2, -1, -1, -1, -1, -1, -1, -1,
 2,  10, 5,  3,  2,  5,  3,  5,  4,  3,  4,  8, -1, -1, -1, -1,
 9,  5,  4,  2,  3,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  11, 2,  0,  8,  11, 4,  9,  5, -1, -1, -1, -1, -1, -1, -1,
 0,  5,  4,  0,  1,  5,  2,  3,  11,-1, -1, -1, -1, -1, -1, -1,
 2,  1,  5,  2,  5,  8,  2,  8,  11, 4,  8,  5, -1, -1, -1, -1,
 10, 3,  11, 10, 1,  3,  9,  5,  4, -1, -1, -1, -1, -1, -1, -1,
 4,  9,  5,  0,  8,  1,  8,  10, 1,  8,  11, 10,-1, -1, -1, -1,
 5,  4,  0,  5,  0,  11, 5,  11, 10, 11, 0,  3, -1, -1, -1, -1,
 5,  4,  8,  5,  8,  10, 10, 8,  11,-1, -1, -1, -1, -1, -1, -1,
 9,  7,  8,  5,  7,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  3,  0,  9,  5,  3,  5,  7,  3, -1, -1, -1, -1, -1, -1, -1,
 0,  7,  8,  0,  1,  7,  1,  5,  7, -1, -1, -1, -1, -1, -1, -1,
 1,  5,  3,  3,  5,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  7,  8,  9,  5,  7,  10, 1,  2, -1, -1, -1, -1, -1, -1, -1,
 10, 1,  2,  9,  5,  0,  5,  3,  0,  5,  7,  3, -1, -1, -1, -1,
 8,  0,  2,  8,  2,  5,  8,  5,  7,  10, 5,  2, -1, -1, -1, -1,
 2,  10, 5,  2,  5,  3,  3,  5,  7, -1, -1, -1, -1, -1, -1, -1,
 7,  9,  5,  7,  8,  9,  3,  11, 2, -1, -1, -1, -1, -1, -1, -1,
 9,  5,  7,  9,  7,  2,  9,  2,  0,  2,  7,  11,-1, -1, -1, -1,
 2,  3,  11, 0,  1,  8,  1,  7,  8,  1,  5,  7, -1, -1, -1, -1,
 11, 2,  1,  11, 1,  7,  7,  1,  5, -1, -1, -1, -1, -1, -1, -1,
 9,  5,  8,  8,  5,  7,  10, 1,  3,  10, 3,  11,-1, -1, -1, -1,
 5,  7,  0,  5,  0,  9,  7,  11, 0,  1,  0,  10, 11, 10, 0, -1,
 11, 10, 0,  11, 0,  3,  10, 5,  0,  8,  0,  7,  5,  7,  0, -1,
 11, 10, 5,  7,  11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 10, 6,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  3,  5,  10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  0,  1,  5,  10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  8,  3,  1,  9,  8,  5,  10, 6, -1, -1, -1, -1, -1, -1, -1,
 1,  6,  5,  2,  6,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  6,  5,  1,  2,  6,  3,  0,  8, -1, -1, -1, -1, -1, -1, -1,
 9,  6,  5,  9,  0,  6,  0,  2,  6, -1, -1, -1, -1, -1, -1, -1,
 5,  9,  8,  5,  8,  2,  5,  2,  6,  3,  2,  8, -1, -1, -1, -1,
 2,  3,  11, 10, 6,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 11, 0,  8,  11, 2,  0,  10, 6,  5, -1, -1, -1, -1, -1, -1, -1,
 0,  1,  9,  2,  3,  11, 5,  10, 6, -1, -1, -1, -1, -1, -1, -1,
 5,  10, 6,  1,  9,  2,  9,  11, 2,  9,  8,  11,-1, -1, -1, -1,
 6,  3,  11, 6,  5,  3,  5,  1,  3, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  11, 0,  11, 5,  0,  5,  1,  5,  11, 6, -1, -1, -1, -1,
 3,  11, 6,  0,  3,  6,  0,  6,  5,  0,  5,  9, -1, -1, -1, -1,
 6,  5,  9,  6,  9,  11, 11, 9,  8, -1, -1, -1, -1, -1, -1, -1,
 5,  10, 6,  4,  7,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  3,  0,  4,  7,  3,  6,  5,  10,-1, -1, -1, -1, -1, -1, -1,
 1,  9,  0,  5,  10, 6,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1,
 10, 6,  5,  1,  9,  7,  1,  7,  3,  7,  9,  4, -1, -1, -1, -1,
 6,  1,  2,  6,  5,  1,  4,  7,  8, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  5,  5,  2,  6,  3,  0,  4,  3,  4,  7, -1, -1, -1, -1,
 8,  4,  7,  9,  0,  5,  0,  6,  5,  0,  2,  6, -1, -1, -1, -1,
 7,  3,  9,  7,  9,  4,  3,  2,  9,  5,  9,  6,  2,  6,  9, -1,
 3,  11, 2,  7,  8,  4,  10, 6,  5, -1, -1, -1, -1, -1, -1, -1,
 5,  10, 6,  4,  7,  2,  4,  2,  0,  2,  7,  11,-1, -1, -1, -1,
 0,  1,  9,  4,  7,  8,  2,  3,  11, 5,  10, 6, -1, -1, -1, -1,
 9,  2,  1,  9,  11, 2,  9,  4,  11, 7,  11, 4,  5,  10, 6, -1,
 8,  4,  7,  3,  11, 5,  3,  5,  1,  5,  11, 6, -1, -1, -1, -1,
 5,  1,  11, 5,  11, 6,  1,  0,  11, 7,  11, 4,  0,  4,  11,-1,
 0,  5,  9,  0,  6,  5,  0,  3,  6,  11, 6,  3,  8,  4,  7, -1,
 6,  5,  9,  6,  9,  11, 4,  7,  9,  7,  11, 9, -1, -1, -1, -1,
 10, 4,  9,  6,  4,  10,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
 4,  10, 6,  4,  9,  10, 0,  8,  3, -1, -1, -1, -1, -1, -1, -1,
 10, 0,  1,  10, 6,  0,  6,  4,  0, -1, -1, -1, -1, -1, -1, -1, 
 8,  3,  1,  8,  1,  6,  8,  6,  4,  6,  1,  10,-1, -1, -1, -1,
 1,  4,  9,  1,  2,  4,  2,  6,  4, -1, -1, -1, -1, -1, -1, -1,
 3,  0,  8,  1,  2,  9,  2,  4,  9,  2,  6,  4, -1, -1, -1, -1,
 0,  2,  4,  4,  2,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 8,  3,  2,  8,  2,  4,  4,  2,  6, -1, -1, -1, -1, -1, -1, -1,
 10, 4,  9,  10, 6,  4,  11, 2,  3, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  2,  2,  8,  11, 4,  9,  10, 4,  10, 6, -1, -1, -1, -1,
 3,  11, 2,  0,  1,  6,  0,  6,  4,  6,  1,  10,-1, -1, -1, -1,
 6,  4,  1,  6,  1,  10, 4,  8,  1,  2,  1,  11, 8,  11, 1, -1,
 9,  6,  4,  9,  3,  6,  9,  1,  3,  11, 6,  3, -1, -1, -1, -1,
 8,  11, 1,  8,  1,  0,  11, 6,  1,  9,  1,  4,  6,  4,  1, -1,
 3,  11, 6,  3,  6,  0,  0,  6,  4, -1, -1, -1, -1, -1, -1, -1,
 6,  4,  8,  11, 6,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 7,  10, 6,  7,  8,  10, 8,  9,  10,-1, -1, -1, -1, -1, -1, -1,
 0,  7,  3,  0,  10, 7,  0,  9,  10, 6,  7,  10,-1, -1, -1, -1,
 10, 6,  7,  1,  10, 7,  1,  7,  8,  1,  8,  0, -1, -1, -1, -1,
 10, 6,  7,  10, 7,  1,  1,  7,  3, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  6,  1,  6,  8,  1,  8,  9,  8,  6,  7, -1, -1, -1, -1,
 2,  6,  9,  2,  9,  1,  6,  7,  9,  0,  9,  3,  7,  3,  9, -1,
 7,  8,  0,  7,  0,  6,  6,  0,  2, -1, -1, -1, -1, -1, -1, -1,
 7,  3,  2,  6,  7,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 2,  3,  11, 10, 6,  8,  10, 8,  9,  8,  6,  7, -1, -1, -1, -1,
 2,  0,  7,  2,  7,  11, 0,  9,  7,  6,  7,  10, 9,  10, 7, -1,
 1,  8,  0,  1,  7,  8,  1,  10, 7,  6,  7,  10, 2,  3,  11,-1,
 11, 2,  1,  11, 1,  7,  10, 6,  1,  6,  7,  1, -1, -1, -1, -1,
 8,  9,  6,  8,  6,  7,  9,  1,  6,  11, 6,  3,  1,  3,  6, -1,
 0,  9,  1,  11, 6,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 7,  8,  0,  7,  0,  6,  3,  11, 0,  11, 6,  0, -1, -1, -1, -1,
 7,  11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 7,  6,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  0,  8,  11, 7,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  1,  9,  11, 7,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 8,  1,  9,  8,  3,  1,  11, 7,  6, -1, -1, -1, -1, -1, -1, -1,
 10, 1,  2,  6,  11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10, 3,  0,  8,  6,  11, 7, -1, -1, -1, -1, -1, -1, -1,
 2,  9,  0,  2,  10, 9,  6,  11, 7, -1, -1, -1, -1, -1, -1, -1,
 6,  11, 7,  2,  10, 3,  10, 8,  3,  10, 9,  8, -1, -1, -1, -1,
 7,  2,  3,  6,  2,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 7,  0,  8,  7,  6,  0,  6,  2,  0, -1, -1, -1, -1, -1, -1, -1,
 2,  7,  6,  2,  3,  7,  0,  1,  9, -1, -1, -1, -1, -1, -1, -1,
 1,  6,  2,  1,  8,  6,  1,  9,  8,  8,  7,  6, -1, -1, -1, -1,
 10, 7,  6,  10, 1,  7,  1,  3,  7, -1, -1, -1, -1, -1, -1, -1,
 10, 7,  6,  1,  7,  10, 1,  8,  7,  1,  0,  8, -1, -1, -1, -1,
 0,  3,  7,  0,  7,  10, 0,  10, 9,  6,  10, 7, -1, -1, -1, -1,
 7,  6,  10, 7,  10, 8,  8,  10, 9, -1, -1, -1, -1, -1, -1, -1,
 6,  8,  4,  11, 8,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  6,  11, 3,  0,  6,  0,  4,  6, -1, -1, -1, -1, -1, -1, -1,
 8,  6,  11, 8,  4,  6,  9,  0,  1, -1, -1, -1, -1, -1, -1, -1,
 9,  4,  6,  9,  6,  3,  9,  3,  1,  11, 3,  6, -1, -1, -1, -1,
 6,  8,  4,  6,  11, 8,  2,  10, 1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10, 3,  0,  11, 0,  6,  11, 0,  4,  6, -1, -1, -1, -1,
 4,  11, 8,  4,  6,  11, 0,  2,  9,  2,  10, 9, -1, -1, -1, -1,
 10, 9,  3,  10, 3,  2,  9,  4,  3,  11, 3,  6,  4,  6,  3, -1,
 8,  2,  3,  8,  4,  2,  4,  6,  2, -1, -1, -1, -1, -1, -1, -1,
 0,  4,  2,  4,  6,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  9,  0,  2,  3,  4,  2,  4,  6,  4,  3,  8, -1, -1, -1, -1,
 1,  9,  4,  1,  4,  2,  2,  4,  6, -1, -1, -1, -1, -1, -1, -1,
 8,  1,  3,  8,  6,  1,  8,  4,  6,  6,  10, 1, -1, -1, -1, -1,
 10, 1,  0,  10, 0,  6,  6,  0,  4, -1, -1, -1, -1, -1, -1, -1,
 4,  6,  3,  4,  3,  8,  6,  10, 3,  0,  3,  9,  10, 9,  3, -1,
 10, 9,  4,  6,  10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  9,  5,  7,  6,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  3,  4,  9,  5,  11, 7,  6, -1, -1, -1, -1, -1, -1, -1,
 5,  0,  1,  5,  4,  0,  7,  6,  11,-1, -1, -1, -1, -1, -1, -1,
 11, 7,  6,  8,  3,  4,  3,  5,  4,  3,  1,  5, -1, -1, -1, -1,
 9,  5,  4,  10, 1,  2,  7,  6,  11,-1, -1, -1, -1, -1, -1, -1,
 6,  11, 7,  1,  2,  10, 0,  8,  3,  4,  9,  5, -1, -1, -1, -1,
 7,  6,  11, 5,  4,  10, 4,  2,  10, 4,  0,  2, -1, -1, -1, -1,
 3,  4,  8,  3,  5,  4,  3,  2,  5,  10, 5,  2,  11, 7,  6, -1,
 7,  2,  3,  7,  6,  2,  5,  4,  9, -1, -1, -1, -1, -1, -1, -1,
 9,  5,  4,  0,  8,  6,  0,  6,  2,  6,  8,  7, -1, -1, -1, -1,
 3,  6,  2,  3,  7,  6,  1,  5,  0,  5,  4,  0, -1, -1, -1, -1,
 6,  2,  8,  6,  8,  7,  2,  1,  8,  4,  8,  5,  1,  5,  8, -1,
 9,  5,  4,  10, 1,  6,  1,  7,  6,  1,  3,  7, -1, -1, -1, -1,
 1,  6,  10, 1,  7,  6,  1,  0,  7,  8,  7,  0,  9,  5,  4, -1,
 4,  0,  10, 4,  10, 5,  0,  3,  10, 6,  10, 7,  3,  7,  10,-1,
 7,  6,  10, 7,  10, 8,  5,  4,  10, 4,  8,  10,-1, -1, -1, -1,
 6,  9,  5,  6,  11, 9,  11, 8,  9, -1, -1, -1, -1, -1, -1, -1,
 3,  6,  11, 0,  6,  3,  0,  5,  6,  0,  9,  5, -1, -1, -1, -1,
 0,  11, 8,  0,  5,  11, 0,  1,  5,  5,  6,  11,-1, -1, -1, -1,
 6,  11, 3,  6,  3,  5,  5,  3,  1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  10, 9,  5,  11, 9,  11, 8,  11, 5,  6, -1, -1, -1, -1,
 0,  11, 3,  0,  6,  11, 0,  9,  6,  5,  6,  9,  1,  2,  10,-1,
 11, 8,  5,  11, 5,  6,  8,  0,  5,  10, 5,  2,  0,  2,  5, -1,
 6,  11, 3,  6,  3,  5,  2,  10, 3,  10, 5,  3, -1, -1, -1, -1,
 5,  8,  9,  5,  2,  8,  5,  6,  2,  3,  8,  2, -1, -1, -1, -1,
 9,  5,  6,  9,  6,  0,  0,  6,  2, -1, -1, -1, -1, -1, -1, -1,
 1,  5,  8,  1,  8,  0,  5,  6,  8,  3,  8,  2,  6,  2,  8, -1,
 1,  5,  6,  2,  1,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  3,  6,  1,  6,  10, 3,  8,  6,  5,  6,  9,  8,  9,  6, -1,
 10, 1,  0,  10, 0,  6,  9,  5,  0,  5,  6,  0, -1, -1, -1, -1,
 0,  3,  8,  5,  6,  10,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 10, 5,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 11, 5,  10, 7,  5,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 11, 5,  10, 11, 7,  5,  8,  3,  0, -1, -1, -1, -1, -1, -1, -1,
 5,  11, 7,  5,  10, 11, 1,  9,  0, -1, -1, -1, -1, -1, -1, -1,
 10, 7,  5,  10, 11, 7,  9,  8,  1,  8,  3,  1, -1, -1, -1, -1,
 11, 1,  2,  11, 7,  1,  7,  5,  1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  3,  1,  2,  7,  1,  7,  5,  7,  2,  11,-1, -1, -1, -1,
 9,  7,  5,  9,  2,  7,  9,  0,  2,  2,  11, 7, -1, -1, -1, -1,
 7,  5,  2,  7,  2,  11, 5,  9,  2,  3,  2,  8,  9,  8,  2, -1,
 2,  5,  10, 2,  3,  5,  3,  7,  5, -1, -1, -1, -1, -1, -1, -1,
 8,  2,  0,  8,  5,  2,  8,  7,  5,  10, 2,  5, -1, -1, -1, -1,
 9,  0,  1,  5,  10, 3,  5,  3,  7,  3,  10, 2, -1, -1, -1, -1,
 9,  8,  2,  9,  2,  1,  8,  7,  2,  10, 2,  5,  7,  5,  2, -1,
 1,  3,  5,  3,  7,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  8,  7,  0,  7,  1,  1,  7,  5, -1, -1, -1, -1, -1, -1, -1,
 9,  0,  3,  9,  3,  5,  5,  3,  7, -1, -1, -1, -1, -1, -1, -1,
 9,  8,  7,  5,  9,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 5,  8,  4,  5,  10, 8,  10, 11, 8, -1, -1, -1, -1, -1, -1, -1,
 5,  0,  4,  5,  11, 0,  5,  10, 11, 11, 3,  0, -1, -1, -1, -1,
 0,  1,  9,  8,  4,  10, 8,  10, 11, 10, 4,  5, -1, -1, -1, -1,
 10, 11, 4,  10, 4,  5,  11, 3,  4,  9,  4,  1,  3,  1,  4, -1,
 2,  5,  1,  2,  8,  5,  2,  11, 8,  4,  5,  8, -1, -1, -1, -1,
 0,  4,  11, 0,  11, 3,  4,  5,  11, 2,  11, 1,  5,  1,  11,-1,
 0,  2,  5,  0,  5,  9,  2,  11, 5,  4,  5,  8,  11, 8,  5, -1,
 9,  4,  5,  2,  11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 2,  5,  10, 3,  5,  2,  3,  4,  5,  3,  8,  4, -1, -1, -1, -1,
 5,  10, 2,  5,  2,  4,  4,  2,  0, -1, -1, -1, -1, -1, -1, -1,
 3,  10, 2,  3,  5,  10, 3,  8,  5,  4,  5,  8,  0,  1,  9, -1,
 5,  10, 2,  5,  2,  4,  1,  9,  2,  9,  4,  2, -1, -1, -1, -1,
 8,  4,  5,  8,  5,  3,  3,  5,  1, -1, -1, -1, -1, -1, -1, -1,
 0,  4,  5,  1,  0,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 8,  4,  5,  8,  5,  3,  9,  0,  5,  0,  3,  5, -1, -1, -1, -1,
 9,  4,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  11, 7,  4,  9,  11, 9,  10, 11,-1, -1, -1, -1, -1, -1, -1,
 0,  8,  3,  4,  9,  7,  9,  11, 7,  9,  10, 11,-1, -1, -1, -1,
 1,  10, 11, 1,  11, 4,  1,  4,  0,  7,  4,  11,-1, -1, -1, -1,
 3,  1,  4,  3,  4,  8,  1,  10, 4,  7,  4,  11, 10, 11, 4, -1,
 4,  11, 7,  9,  11, 4,  9,  2,  11, 9,  1,  2, -1, -1, -1, -1,
 9,  7,  4,  9,  11, 7,  9,  1,  11, 2,  11, 1,  0,  8,  3, -1,
 11, 7,  4,  11, 4,  2,  2,  4,  0, -1, -1, -1, -1, -1, -1, -1,
 11, 7,  4,  11, 4,  2,  8,  3,  4,  3,  2,  4, -1, -1, -1, -1,
 2,  9,  10, 2,  7,  9,  2,  3,  7,  7,  4,  9, -1, -1, -1, -1,
 9,  10, 7,  9,  7,  4,  10, 2,  7,  8,  7,  0,  2,  0,  7, -1,
 3,  7,  10, 3,  10, 2,  7,  4,  10, 1,  10, 0,  4,  0,  10,-1,
 1,  10, 2,  8,  7,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  9,  1,  4,  1,  7,  7,  1,  3, -1, -1, -1, -1, -1, -1, -1,
 4,  9,  1,  4,  1,  7,  0,  8,  1,  8,  7,  1, -1, -1, -1, -1,
 4,  0,  3,  7,  4,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 4,  8,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 9,  10, 8,  10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  0,  9,  3,  9,  11, 11, 9,  10,-1, -1, -1, -1, -1, -1, -1,
 0,  1,  10, 0,  10, 8,  8,  10, 11,-1, -1, -1, -1, -1, -1, -1,
 3,  1,  10, 11, 3,  10,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  2,  11, 1,  11, 9,  9,  11, 8, -1, -1, -1, -1, -1, -1, -1,
 3,  0,  9,  3,  9,  11, 1,  2,  9,  2,  11, 9, -1, -1, -1, -1,
 0,  2,  11, 8,  0,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 3,  2,  11,-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 2,  3,  8,  2,  8,  10, 10, 8,  9, -1, -1, -1, -1, -1, -1, -1,
 9,  10, 2,  0,  9,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 2,  3,  8,  2,  8,  10, 0,  1,  8,  1,  10, 8, -1, -1, -1, -1,
 1,  10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 1,  3,  8,  9,  1,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  9,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
 0,  3,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
*/


/*
   Given a grid cell and an isolevel, calculate the triangular
   facets required to represent the isosurface through the cell.
   Return the number of triangular facets, the array "triangles"
   will be loaded up with the vertices at most 5 triangular facets.
	0 will be returned if the grid cell is either totally above
   of totally below the isolevel.
*/
int Polygonise(GRIDCELL* grid,double isolevel,TRIANGLE **triangles)
{
   int i,ntriang;
   int cubeindex;
   XYZ* vertlist[12];

   /*
      Determine the index into the edge table which
      tells us which vertices are inside of the surface
   */
   cubeindex = 0;
   if (grid->val[0] < isolevel) cubeindex |= 1;
   if (grid->val[1] < isolevel) cubeindex |= 2;
   if (grid->val[2] < isolevel) cubeindex |= 4;
   if (grid->val[3] < isolevel) cubeindex |= 8;
   if (grid->val[4] < isolevel) cubeindex |= 16;
   if (grid->val[5] < isolevel) cubeindex |= 32;
   if (grid->val[6] < isolevel) cubeindex |= 64;
   if (grid->val[7] < isolevel) cubeindex |= 128;

   /* Cube is entirely in/out of the surface */
   if (edgeTable[cubeindex] == 0)
      return(0);

   /* Find the vertices where the surface intersects the cube */
   if (edgeTable[cubeindex] & 1)
      vertlist[0] =
         VertexInterp(isolevel,grid->p[0],grid->p[1],grid->val[0],grid->val[1]);
   if (edgeTable[cubeindex] & 2)
      vertlist[1] =
         VertexInterp(isolevel,grid->p[1],grid->p[2],grid->val[1],grid->val[2]);
   if (edgeTable[cubeindex] & 4)
      vertlist[2] =
         VertexInterp(isolevel,grid->p[2],grid->p[3],grid->val[2],grid->val[3]);
   if (edgeTable[cubeindex] & 8)
      vertlist[3] =
         VertexInterp(isolevel,grid->p[3],grid->p[0],grid->val[3],grid->val[0]);
   if (edgeTable[cubeindex] & 16)
      vertlist[4] =
         VertexInterp(isolevel,grid->p[4],grid->p[5],grid->val[4],grid->val[5]);
   if (edgeTable[cubeindex] & 32)
      vertlist[5] =
         VertexInterp(isolevel,grid->p[5],grid->p[6],grid->val[5],grid->val[6]);
   if (edgeTable[cubeindex] & 64)
      vertlist[6] =
         VertexInterp(isolevel,grid->p[6],grid->p[7],grid->val[6],grid->val[7]);
   if (edgeTable[cubeindex] & 128)
      vertlist[7] =
         VertexInterp(isolevel,grid->p[7],grid->p[4],grid->val[7],grid->val[4]);
   if (edgeTable[cubeindex] & 256)
      vertlist[8] =
         VertexInterp(isolevel,grid->p[0],grid->p[4],grid->val[0],grid->val[4]);
   if (edgeTable[cubeindex] & 512)
      vertlist[9] =
         VertexInterp(isolevel,grid->p[1],grid->p[5],grid->val[1],grid->val[5]);
   if (edgeTable[cubeindex] & 1024)
      vertlist[10] =
         VertexInterp(isolevel,grid->p[2],grid->p[6],grid->val[2],grid->val[6]);
   if (edgeTable[cubeindex] & 2048)
      vertlist[11] =
         VertexInterp(isolevel,grid->p[3],grid->p[7],grid->val[3],grid->val[7]);

   /* Create the triangle */
   ntriang = 0;
   for( i = 0; triTable[ cubeindex * 16 + i ] != -1; i += 3 )
   {
   	TRIANGLE* triangle = &(*triangles)[ntriang];
      triangle->p[0] = vertlist[ triTable[ cubeindex * 16 + i ] ];
      triangle->p[1] = vertlist[ triTable[ cubeindex * 16 + i + 1 ] ];
      triangle->p[2] = vertlist[ triTable[ cubeindex * 16 + i + 2 ] ];
      ntriang++;
   }

   return(ntriang);
}