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| {{demoscene}}
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| {{Unreferenced|date=April 2010}}
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| {{Citations missing|date=April 2010}}
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| The '''plasma effect''' is a computer-based visual effect animated in real-time. It uses cycles of changing colours warped in various ways to give an illusion of liquid, organic movement.
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| [[Image:Plasma effect.jpg|200px|thumb|left|A still screenshot of a typical plasma effect.]]
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| [[File:-PLASMA-ColorCycling.Gif|200px|thumb|left|Animated color cycling feature as in Fractint]]
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| Plasma was probably invented by [[demoscene|demo coders]] for use in their [[Demo (computer programming)|demos]] where the effect was heavily used, especially in the early 1990s. The effect was particularly common on the [[Commodore Amiga]] where it could be implemented very efficiently by using the features of the proprietary display hardware. Plasma can also be implemented easily in software rendering by using sinus tables and [[palette (computing)|pseudocolor palettes]], and it has also been the first true demo effect for many beginning PC democoders.
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| The fractal software [[Fractint]] also incorporates an algorithm known as "plasma", which, when combined with the color cycling feature of the software, can provide a result which resembles a typical plasma effect used in demos. The technical basis, however, is completely different, and a color cycling plasma is somewhat less dynamic than a demo plasma.
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| == Synopsis ==
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| [[Image:AAlib-gradient.png|250px|thumb|left|A plasma effect rendered in [[ANSI art]] by the [[AAlib]] library.]]
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| As there are many "hacked" approaches for implementing a plasma effect, this outline of an algorithm will just describe the theoretical basis for the effect. In order to achieve a sufficiently fast and good-looking real-time implementation (especially on the limited hardware available at the time this effect was at the height of its popularity in the 1990s), one would often do "non-correct" approximations to this algorithm. This, however, can often be done without noticeable visual differences.
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| This algorithm is given in two dimensions, but could easily be adopted to any number of dimensions for any number of color channels.
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| Let <math>f(x, y)</math> be a multi-frequency noise function of two 2 variables (''e.g.'', a [[perlin noise]] function). Let each color component <math>c</math> at the pixel <math>(x, y)</math> be a linear function of the expression <math>\sin(f(x,y) \cdot \omega_c)</math>.
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| == See also == | |
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| [[Diamond-square algorithm|Plasma fractal]] is a fractal that the plasma effect can be applied to with nice results.
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| == External links ==
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| * [http://www.anfyteam.com/anj/plasma/plasma.html Java applet demonstrating plasma effect]
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| * [http://www.bidouille.org/prog/plasma Page explaining how the effect is built and including a JavaScript animation]
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| [[Category:Demo effects]]
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