/* these all are for a hex one unit across */
static double hexptvd[6][2] = {
{.577350269189625764509148780502, 0.0}, /* 1.0/sqrt3 */
/* these all are for a hex one unit across */
static double hexptvd[6][2] = {
{.577350269189625764509148780502, 0.0}, /* 1.0/sqrt3 */