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Trifox
Account closed
Registered: Mar 2006
Posts: 108 |
plasma/linedoubling
Hi all, now i have a question about how to implement a nice plasma effect, i saw many of those in nearly any demo, but many use these ugly fli flickering modes
i want to achieve an effect like this:
http://www.digitalgott.com/c64/plasma_000.prg
but in gfx mode ... i believe y scroll register comes in handy when trying to do stuff like this ... how to start? |
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Oswald
Registered: Apr 2002
Posts: 5031 |
you're not specific enough.
what do you mean with "but in gfx mode" ? any gfx mode is a gfx mode :D
so, specify the gfx mode, and an example would be good from an existing demo, so we know what would you like your plasma to look like.
btw, using macros even for filling each 25 line is a bad coding habit, but you'll forget them soon if you're going for speed ;) |
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Trifox
Account closed
Registered: Mar 2006
Posts: 108 |
yes, the stuff with the macros is really ugly, it eats up all my memory ... ;) but this way i do not have to fiddle around with crossing 256 byte page borders ... ;))) |
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Scout
Registered: Dec 2002
Posts: 1568 |
Quote: Hi all, now i have a question about how to implement a nice plasma effect, i saw many of those in nearly any demo, but many use these ugly fli flickering modes
i want to achieve an effect like this:
http://www.digitalgott.com/c64/plasma_000.prg
but in gfx mode ... i believe y scroll register comes in handy when trying to do stuff like this ... how to start?
The example you gave wasn't a real plasma but you want something to make something I made in Accumulator, right?
That's done with some cheating; I only plot the outerside pixels instead of drawing horizontal lines.
---
-= Silicon Ltd. =-
http://forum.siliconlimited.com
Commodore 64 Scenemusic Podcast
http://8bitmayhem.blogspot.com/ |
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Trifox
Account closed
Registered: Mar 2006
Posts: 108 |
yes, this is exactly the effect i want to achieve .... and ... you do it by just removing one pixel on the left and adding one on the right ? and this for each row with some sine/cosine ? hmm, cool method ( i will steal it and reimplement it ... harhar ) .... but i saw such effects also with colors, and i also saw some scrollers which stretched smoothly in y-direction ... ;) |
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Krill
Registered: Apr 2002
Posts: 2855 |
Do you mean a plasma like in the first hidden part of this demo: Panta Rhei ? |
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Scout
Registered: Dec 2002
Posts: 1568 |
Quote: yes, this is exactly the effect i want to achieve .... and ... you do it by just removing one pixel on the left and adding one on the right ? and this for each row with some sine/cosine ? hmm, cool method ( i will steal it and reimplement it ... harhar ) .... but i saw such effects also with colors, and i also saw some scrollers which stretched smoothly in y-direction ... ;)
Yes, you got that right with the pixels.
The same effect done with colors is using a different technique which comes close to an Tech-Tech.
But you can't achieve 2 different sinewaves (on the left and on the right) with that like I did :P
---
-= Silicon Ltd. =-
http://forum.siliconlimited.com
Commodore 64 Scenemusic Podcast
http://8bitmayhem.blogspot.com/ |
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Trifox
Account closed
Registered: Mar 2006
Posts: 108 |
oh yes, that is the effect i wanted to achieve, sorry for not pointing you to an example file, so, how is this fullscreen smooth sine multicolor effect done ( the first in the demo ... )) |
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Oswald
Registered: Apr 2002
Posts: 5031 |
IMHO things like waving a vertical color wash horizontally, or changing the width of a gradient doesnt counts as plasma |
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Trifox
Account closed
Registered: Mar 2006
Posts: 108 |
yes yes yes, and this is the reason why the thread is called plasma/linedoubling ... ;))) |
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Krill
Registered: Apr 2002
Posts: 2855 |
Oswald: that effect was called eci-plasma originally. And plasma rather refers to the looks of the effect, not the technicality behind it. |
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