Why restore the elements of background and foreground in separate passages in a scene animated 3D CGI?

Imagine an animated scene 3D CGI (not a stereoscopic scene where you need glasses but a regular CGI 3D scene).

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In the scene, there is a main area (call it the background element) and the foreground or the foreground element.  The substantive element of the scene has a car on the road in the countryside.  The foreground element consists of trees and shrubs that grow on trees. The shot is 4 seconds and movement of the camera is a simple camera upward tilt, where the camera is located upward to the Crown of a tree and behind that tree and the camera tilts down to place as he leans on his car in the background.

It is recommended to render elements (background, foreground, etc.) in the separate and composite passes in post-production.

The question is:

Why is it advisable to render the elements of background and foreground in separate passages in a 3D CGI animated the scene? In the example of the previous shot, why not make the background and foreground together in the same passage?

In order to strengthen this argument, I read somewhere online of an excerpt of a book that says the following:

"In addition, it is also common to render elements of 3D animation, such scenes.

as the background and foreground, passes separate to be met

in the post ".

Why is he current to render the components separately in the animated scene?

Thank you!

If you have separate passages, you can choose to manipulate elements in the application of the composition, rather than opportunities all in 3D, which can take some time. For example, you might choose to blur on the background in the application of the makeup, or you could choose to lighten or darken. Similarly, when rendering passes from the scene, you can have - say - a passage just for reflections, so you can decide to mix the highlights/highlights different facts in the application of the makeup, to make them stand out more or submit their. And so on.

Tags: After Effects

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