Hemispherical Lighting Insights, Thomas Roughton, Peter-Pike Sloan, Ari Silvennoinen and Peter Shirley Activision Technical Report ATVI-TR-24-01, May 2024 ZH3: Quadratic Zonal Harmonics, Thomas Roughton, Peter-Pike Sloan, Ari Silvennoinen, Michal Iwanicki and Peter Shirley Proceedings of the ACM on CGIT, vol 7, issue 1, (I3D 2024)