Multi-pass rendering
Multi-pass images give digital compositors a great
deal of control over the look of the shot. Compositors
can make an overall improvement to each pass as well as
adjust the final composite more artistically. In addition,
compositors can take advantage of a specific pass by
interactively relighting the scene, adding motion blur or
even retexturing the CG elements without spending extra
time re-rendering them in the 3D software.