[OT] Frame rates and human eyes (was Re: Increasing an SDL application's priority)

Also, at refresh rates below some 100 Hz, the eye can easily tell 100 Hz
"double flash" scrolling (ie 50 fps on a 100 Hz display) from 50 Hz full
frame rate scrolling. The former “vibrates” slightly, while the latter
appears absolutely smooth
(…)
Yes, but a constant frame rate of 60 fps on a 60 Hz display still looks
smoother than 60 fps on a 120 Hz display.

How is throwing frames at frequency X not the same as throwing doubled
frames at frequency 2X (or throwing frames every two refreshes at frequency
2
X)? If your timing is correct, you should see the same thing, shouldn’t
you?

I think I’ll write a program to test this out. Since we’re getting way
off-topic, e-mail me if you want to participate in an off-line conversation.–

Olivier A. Dagenais - Software Architect and Developer