Compare against shader toy Disney reference

[gkjohnson]

• https://www.shadertoy.com/view/Dtl3WS
• https://twitter.com/AnatoleDuprat/status/1612249865307947008
• https://www.shadertoy.com/view/cll3R4
• https://twitter.com/AnatoleDuprat/status/1606065558406864896