const Vertex obstruction_cube_v[] = {
  {    0,0,0}, // Vertex indices in .OBJ files are based at 1.
  {   -8 /* -0.500000 */,    -8 /* -0.500000 */,    -8 /* -0.500000 */},
  {   -8 /* -0.500000 */,    -8 /* -0.500000 */,     8 /*  0.499999 */},
  {    8 /*  0.500000 */,    -8 /* -0.500000 */,     8 /*  0.500000 */},
  {    8 /*  0.500000 */,    -8 /* -0.500000 */,    -8 /* -0.500000 */},
  {   -8 /* -0.500000 */,     8 /*  0.500000 */,    -8 /* -0.500000 */},
  {   -8 /* -0.500000 */,     8 /*  0.500000 */,     8 /*  0.500000 */},
  {    8 /*  0.500000 */,     8 /*  0.500000 */,     8 /*  0.500000 */},
  {    8 /*  0.500000 */,     8 /*  0.500000 */,    -8 /* -0.500000 */},
  { -128,-128,-128}, /* End of list marker */
};
const Edge obstruction_cube_e[] = {
  {    1,    2 },
  {    1,    4 },
  {    1,    5 },
  {    2,    3 },
  {    2,    6 },
  {    3,    4 },
  {    3,    7 },
  {    4,    8 },
  {    5,    6 },
  {    5,    8 },
  {    6,    7 },
  {    7,    8 },
  {    0,    0 }  /* End of list. (Index 0 is never used) */
};