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{{about|3D computer graphics|the computer game developer|Particle Systems}}
{{inline|date=January 2018}}
[[File:particle sys fire.jpg|thumb|A particle system used to simulate a fire, created in [[3dengfx]]
[[File:particle sys galaxy.jpg|thumb|''Ad hoc'' particle system used to simulate a galaxy, created in 3dengfx
[[File:Pi-explosion.jpg|thumb|A particle system used to simulate a bomb explosion, created in [[particleIllusion]]
A '''particle system''' is a technique in [[game physics]], [[motion graphics]], and [[3D computer graphics|computer graphics]] that uses many minute [[sprite (computer graphics)|sprite]]s, [[3D model]]s, or other graphic objects to simulate certain kinds of "fuzzy" phenomena, which are otherwise very hard to reproduce with conventional rendering techniques – usually highly [[Chaos theory|chaotic]] systems, natural phenomena, or processes caused by chemical reactions.
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{{multiple image
| align = center | image1 = Particle Emitter.jpg
| width1 = 220 | caption1 = A cube emitting 5000 animated particles, obeying a "gravitational" force in the negative Y direction
| image2 = Strand Emitter.jpg
| width2 = 220 | caption2 = The same cube emitter rendered using static particles, or strands
}}
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