Simple particle system

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A particle system is a technique in computer graphics that uses a large number of very small sprites, 3D models, or other graphic objects to simulate certain kinds of  phenomena, which are otherwise very hard to reproduce with conventional rendering techniques Рusually highly chaotic systems, natural phenomena, or processes caused by chemical reactions.

Examples of such phenomena which are commonly replicated using particle systems include fire, explosions, smoke, moving water (such as a waterfall), sparks, falling leaves, rock falls, clouds, fog, snow, dust, meteor tails, stars and galaxies, or abstract visual effects like glowing trails, magic spells, etc.