Ah! DF/X Composium…
I saw one at Post Effects in Chicago around 1989 or 90. Mike Fayette was a very kind host to my older brother and I.
My boss in Orlando had used one, and wanted us to buy the used one from Century III in late 1997. I admired them, but I tried to explain that you could do everything it did with After Effects, for a lot less money. The boss wasn’t happy with my reasoning. Thankfully, I think that person is out of the business now.
Other weird systems:
Colorgraphics ArtStar 3D Plus
Colorgraphics DP 4:2:2 and DP-Max
Dubner CBG (Huge at ABC Network, (See 20/20) and Video Post and Transfer I believe)
Ampex had the first commercial paint system called AVA. (Ampex Video Art) There is a tangential link to Pixar there.
Never used, but saw Aurora paint systems at CNN Center in Atlanta in the late 1990s(?)
Aurora became Chyron Liberty Paint on SGI, and that became something else…
There was III or Triple I , first on Symbolics, and later on SGI. There’s a Disney Tron link there.
Perhaps the Computer History Museum could do a wing of video graphics systems?