private void CalcTriNormal(RecastVertex v0, RecastVertex v1, RecastVertex v2, out float[] norm)
{
RecastVertex e0, e1, n;
e0 = RecastVertex.Sub(v1, v0);
e1 = RecastVertex.Sub(v2, v0);
n = RecastVertex.Cross(e0, e1);
n.Normalize();
norm = n.ToArray();
}
