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Twynn
Account closed
Registered: Nov 2005
Posts: 9 |
Half pixel shifting
First of all: It's good to see that the C64-scene is still alive.
I kinda left the scene about ten years ago but after accidently crossing this site I got interested a bit again. Downloaded some demo's to see what happened since I left and I was quite amazed. Not those ugly 8x8 modes anymore, but good looking demos.
Anyway, when I was watching krestage I saw this intro for each demopart which used this high-resolution text which is said to use half pixel shifting? I'm still familiar with the normal vic-tricks, but this one made me curious.
Now I wonder how this is done. Is it just a visual trick or has the vic really some possibility to do half pixel movements or something? |
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T.M.R
Account closed
Registered: Dec 2001
Posts: 749 |
As an aside, there are Atari 8-bit demos using Hard Interlaced Picture (HIP, the "Hard" is the crew who invented the routine) mode and variants that do the odd/even line thing and they look pretty good (using the Atari's 80x192 16 colour modes and a "feature" of the hardware that allows the pixels to shunt half a pixel sideways, the smooth scroll can't do that with the 16 colour mode). |
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algorithm
Registered: May 2002
Posts: 705 |
I think some examples of this Atari Mode were in the demo 'Numan' although i could be wrong. The display still does not look as good as IFLI on C64 though. The 80 pixel horizontal width would then give a virtual 160 h width after interlace and C64 could do virtual 320 width.
Still, The Atari probably has other tricks up its sleeve. Would like to see some graphic mode examples for this machine.
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
Quote:
not really IFLI, but i think HCL's Interruptus Retriggerus is a good example? (the part with the FPP logo)
yes, that one is using the alternating one pixel offset... and as you can see it looks quite smooth :)
Quote:
But IMHO what groepaz mentioned last is the most important thing about any interlace mode (unless its displayed with a beamer or my green-monitor :).
the first effectivly smoothens horizontally, the second vertically...so a combination of both would be ideal :)
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algorithm
Registered: May 2002
Posts: 705 |
Some examples although there are more of interlace techniques in C64 Demo's
Crest Avantarde. The interlaced picture of three men covering the side borders. alternates between two lines.. eg picture 1 has pic1 data for two vertical pics, then pic2 info for the next 2, then pic1 info etc...
then picture 2 has pic2 data for two vertical pics, then pic1 info for next two etc etc
Don't Meet Crest. Cross hatched technique, etc |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
And btw, half-pixel interlace was of course first seen in this demo: Unbounded/Demotion (I think.) |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
whatever is in that demo, its certainly not half-pixel interlace :o) |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
why not??? |
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pernod
Account closed
Registered: Nov 2004
Posts: 25 |
"Reticulate" by SCG was, as far as I know, the first 64 demo to use interlace effects. It was released in 1988. There is a scroller that utilizes the "half-pixel-shift" effect.
Reticulate
"Our pixels are smaller than yours"
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Dane
Registered: May 2002
Posts: 423 |
Check out the final part of Digital Magic: Digital Magic for an example of interlaced hires in many colours. Probably the smoothest interlace there is. |
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algorithm
Registered: May 2002
Posts: 705 |
Dane, that picture probably rates as one of the best I have seen, quality and resolution wise (Was it Kirsten Dunst btw?)
What mode was it in? |
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