simpler than original polygon, the simplest of surface
representations. Therefore, in the same amount of
computing time to process more basic primitives and
produce a more complex picture. Due to the simplicity of
the particle distribution is also easy to apply motion,
(Motion-Blur), which is the diffuse effect caused by the
rapid movement of an object in the scene. Many classical
techniques ignore this step causing diffuse effect (aliasing)
of the edges of objects that move quickly on the scene, like
a train or plane. Third, particle systems model objects that
are "alive" (change over time), which is quite difficult to
model with techniques based on surface due to the difficulty
of incorporating complex dynamics1.