public FrustumState BoxInFrustum(Mesh.BoundingBox b, Vector3 Offset)
{
FrustumState result = FrustumState.INSIDE;
for (int i = 0; i < 6; i++)
{
if (pl[i].Distance(b.GetVertexP(pl[i].Normal) + Offset) < 0)
return FrustumState.OUTSIDE;
else if (pl[i].Distance(b.GetVertexN(pl[i].Normal) + Offset) < 0)
result = FrustumState.INTERSECT;
}
return (result);
}