Specific to this demo, Inigo Quilez did a breakdown back in 2009 called 'behind elevated' for Function 2009 but I can't find it on his site today. Maybe it's th

Specific to this demo, Inigo Quilez did a breakdown back in 2009 called 'behind elevated' for Function 2009 but I can't find it on his site today. Maybe it's there. But here's the archive link to the pdf. https://web.archive.org/web/20120119015415if_/http://www.iquilezles.org/www/material/function2009/function2009.pdf https://web.archive.org/web/20120119015415if_/http://www.iqu...