Oh, you absolutly need at least 4!! Points
static TOUCHDOWNVTX tdvtx[ntdvtx] = {
{ _V(0, .001, 1.5), 1e6, 1e5, 1.6, 0.1 },
{ _V(2, .001, -2.6), 1e6, 1e5, 3,.2 },
{ _V(-2, .001, -2.6), 1e6, 1e5, 3, .2 },
{_V(0.0, 1.5, 0.0), 1e6, 1e5, 3}
};
//or better:
static TOUCHDOWNVTX tdvtx[ntdvtx] =...