>>gaigal+unb
you'll like this then https://www.youtube.com/watch?v=oKg1hTOQXoY

>>Animat+phb
Sutherland started programming on the TX-0, which was widely accessible on the MIT campus, but Sketchpad was definitely done on the big gun, the TX-2, which was still inside Lincoln Laboratories. (Sutherland's uncle-in-law https://en.wikipedia.org/wiki/Ivan_Getting helped get him into Lincoln Labs. See https://www.computerhistory.org/collections/catalog/10273819... .) There's an active TX-2 emulation project at the moment https://tx-2.github.io/ , which has the primary goal of getting Sketchpad running.

>>fs_sof+(OP)
The first demonstrator here is Timothy E. Johnson, not Ivan Sutherland. Johnson did the "Sketchpad III" work extending Sketchpad into 3D which is demonstrated from 11:30 https://www.youtube.com/watch?v=6orsmFndx_o&t=690s . Then Larry Roberts appears to demonstrate his own work on hidden-line removal, which is shown from 14:42 https://youtu.be/6orsmFndx_o?t=882 .

See https://tx-2.github.io/videos#sketchpad for more video, including appearances by Sutherland himself. https://tx-2.github.io/ is an active effort to get Sketchpad running again on a new TX-2 emulator.

>>d-us-v+1Jb
I mean, the panning was pretty impressive at the time as well. In Sutherland's 1994 "Bay Area Computer History Perspectives" talk https://www.youtube.com/watch?v=k_cevebLO-A&list=PLKTTWvMgeg... he points out flickering or 'jumping' due to the processor burden of rescaling in a number of places in the Sketchpad demo video, including at 42:30 https://www.youtube.com/watch?v=k_cevebLO-A&list=PLKTTWvMgeg... and at 50:10 https://www.youtube.com/watch?v=k_cevebLO-A&list=PLKTTWvMgeg... .