Hey rewing.

To get the plane equation, you calculate the normal of the plane and then supply a point to the plane where given a normal n and a point p0, the plane equation is n . (p - p0) = 0 where p is any point on the plane and n is a normal vector with unit length.

I still don't fully understand what the worst angle is though. Can you maybe explain it in mathematical terms (like say an inequality)?