9fingers technical question
category: code [glöplog]
Checking the only good video capture of 9 fingers available on YouTube since I was trying to do the same, I have a question because I always wondered why this demo runs in interlaced mode.
The only two advantages of interlace mode are to provide a better resolution (twice the number of lines) and a 100% PAL compatible signal, with a better 50Hz vsync.
But looking at the graphics, how making a deinterlaced version by duplicating fields (which is the worst way of doing it) makes a perfect rendering with no flickering at all, the demo obviously generates low res graphics, while running in interlaced for no reason.
Is that a bug, or was there an underlying choice for that? Maybe just full PAL video compatibility? I'm not familiar with the Amiga chipset, so there might be one. If there's not, maybe the video mode is not correctly setup at the start of the demo.
The only two advantages of interlace mode are to provide a better resolution (twice the number of lines) and a 100% PAL compatible signal, with a better 50Hz vsync.
But looking at the graphics, how making a deinterlaced version by duplicating fields (which is the worst way of doing it) makes a perfect rendering with no flickering at all, the demo obviously generates low res graphics, while running in interlaced for no reason.
Is that a bug, or was there an underlying choice for that? Maybe just full PAL video compatibility? I'm not familiar with the Amiga chipset, so there might be one. If there's not, maybe the video mode is not correctly setup at the start of the demo.
Iirc it was a conscious decision by Lone Starr in order to get the temporal smudging from the half-line vertical displacement.
It’s strange because most animations are 25fps or less.
But maybe it looked nicer on a CRT indeed.
But maybe it looked nicer on a CRT indeed.
The "temporal smudging from the half-line vertical displacement" means the scanlines are less separated, which results in more even colour, regardless of the animation rate.
