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Plasmas

category: general [glöplog]
 
1) In which demos appeared the first plasmas?
2) What kind of thing is "plasma" in physics?
Where can I find pictures of how physics plasma look like?
..just curious, because I know they have something to do with physics but I don't have a clue what it is there..
added on the 2004-10-29 17:17:22 by Optimonk Optimonk
a plasma usually refers to a superheated gas featuring ions and electrons and is usually confined in some electromagnetic field/chamber. http://www.plasmas.org will probably answer all your questions :)

dont remember about the first "plasma" effect in a demo though, but it's really old (on commodore?)
added on the 2004-10-29 17:27:02 by keops keops
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Or try a neon tube, florescent lamp etc.. you have seen many plasmas in your life.
added on the 2004-10-29 17:48:14 by Stelthzje Stelthzje
My guess would be that the plasma originated on amiga...
added on the 2004-10-29 17:48:39 by Stelthzje Stelthzje
First so called "plasma" i've ever seen (ugly music and very slow effect) :

"http://ftp.amigascne.org/pub/amiga/groups/p/prong/prong-copper dir"

Most probably done in 1990.
added on the 2004-10-29 18:08:03 by hitchhikr hitchhikr
My guess is also that plasma originated on the Amiga in early 1990 or late 1989. The first plasma was probably the tech-tech'ed rastersplits type, like it can be seen in Cool Fridge/Upfront. Before that there had ofcourse been made rastersplits (aka coppersplits or rasterbenders) that didn't tech-tech, both on Amiga and C64.
added on the 2004-10-29 22:15:10 by cruzer cruzer
I wanna see a modern day plasma zoom. Nexus 7 is the only demo I've ever seen that.
I suppose this is the modern day version of Andromeda's shadeclusters:

http://pouet.net/prod.php?which=13028

No?
isnt the trick with shade clusters that you dont have to rotate all the points? you just rotate the unit vectors and then use these when plotting the rotated points.. each point is one unit apart from the next.

still has to project them though.. or maybe not. :)
added on the 2004-10-30 05:20:32 by loaderror loaderror
About plasmas: I also think it was the early amiga days.

The whole point of it was that it's an hardware effect that could not have been done pixel by pixel. The effect heavily used the amigas bitplane-concept, per-scanline-scrolling, the blitter and sometimes per-scanline-palette-update.

Has been imitated on C64/PC, but does not make too much sense as a hardware-effect there, I guess.
added on the 2004-10-30 10:07:30 by Spin Spin
Another one which featured a very cool and truly hardware plasma zoom is David Copperfield.

Thanks for the infos. Another question would be: So,. which was the first software plasma as the usual ones I used to code? (for each pixel, color=sin(x)+sin(y)+..)
added on the 2004-10-30 12:47:33 by Optimonk Optimonk
The first one i reckall is from coolfridge/Upfront.
added on the 2004-10-30 16:49:42 by NoahR NoahR
One of the first plasma thingy of ST was Full Screen Demo by Level 16 released in 1988. But there certainly was some precedent.
added on the 2004-10-30 17:06:25 by p01 p01
P01? It was not a plasma effect at all, are you stoned or what? ;)
added on the 2004-10-30 17:11:01 by keops keops
I must be stoned. Sorry I only watched it in Steem.

And since the "pixels" of the picture moving in the background are 8 pixels wide ( 2 nops, aka the time for a move.w #$007, $ffff8240 ) I thought it was a sort of plasma.

Ok, so, I guess the ColorShock II screen in the Cuddly released in april 1989 count as a "plasma" though it wasn't waving.
added on the 2004-10-30 17:36:30 by p01 p01
P01: well, you're right somehow since most plasma effects on the Atari were based on that technic :)

however I can't remember what demo featured the first real plasma on the ST...
added on the 2004-10-30 17:45:19 by keops keops
Sorry to bump it after 13 years :)) there's this STe demo http://www.pouet.net/prod.php?which=60116 Neat 4 pixels plasma!
I would like to know if it was done on the Amiga 500?
2 years later, in 2006, they could create with a cool trick a color scroller of 4 pixels on the STf. http://www.pouet.net/prod.php?which=29074 )
in physics, plasma is a gasly substance.
on amiga one might guess that the first plasma effects where just palette rotation (cyclic) of a irregular fractal image.
later it became know for its sin/cos table approach ofc. first plasma being a cyclic palette rotation is just a guess from my side though. it might be called something else. would be cool if someone figured out when the first "plasma effect" was coded indeed.
added on the 2017-03-29 23:18:35 by rudi rudi
On Amiga an 8*1-plasma comes naturally...
...if you put 40 $01800RGB longwords after eachother in your copperlist you get a line of 40*8pixelsWithSameColor=320pixels (your screen should be set accordingly in the registers for screen-size)...
...so if you do that for each line and set the colors with a sinetable you get a plasma.
...adding a mask and more planes would yield higher resolutions...
...while i think the DMA can´t handle them many instructions! (for 1*1 or even 2*1 (?) Haven´t coded the Amiga since the mid-90s, so i am not quite into it right now!)
But all of that is like Rastersplits...so no real plasma as we know it nowadays...for that you need a Framebuffer, so chunky2planar would have been an option lateron i guess.
A quite early plasma on C64 can be found in this demo (August 1990):

Tour De Force/Origo

To leave the first part, press "Restore" (PgUp in Vice).
added on the 2017-03-30 09:19:46 by Zonkham Zonkham
On Amiga the plasma effect indeed became popular around the spring of 1990. The name "plasma" was used at least in June of the same year. That isn't to say someone hadn't done it before or on other machines.
added on the 2017-03-30 11:01:31 by break break
Those as certainly not the first plasma on the Amiga, but it took it to another level

Hot Dots by Coma

Including a timeless soundtrack
added on the 2017-03-31 21:08:13 by Triace Triace

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