Visual effects (VFX) part of the process of creating almost any film productions.
Logically occur more in those that recreate imaginary worlds, present, past the future, or when the cost of making conventional means exceed arising from the use of complex software platforms animation and compositing.
Allow recreate scenes with great visual realism, using numerous “layers” superimposed image to achieve this end. In the video below, with effect from the science fiction film “Prometheus”, we can see some scenes from the film in which the construction process is shown in the same. An interesting example for our classes computer animation.