then you should do it at the 4th vector component of all points within the surface. Then's when. Otherwise you'll miss, I think.
(, Mon 8 Jun 2020, 17:08, Reply)
It's the only class I ever took where I had no idea what was going on at any point. Systems of differential equations? Systems of my arse, more like.
(, Mon 8 Jun 2020, 22:37, Reply)