Say, you have a few layers of objects and composed something like this—
2x “Square” + particle output
And now you want to work on this whole image and give the following—
OR look like this —
Before you go forth and create a few duplications of the Square and Particle output, or even planning to perform several rounds of encoding, consider the use of Frame Buffer:
A Frame Buffer object on Layer N represents the flattened image from Layer 1 to Layer N-1
Hence, with this feature in mind, you can apply effects on the whole composite image without costing too much on CPU(but cost memory) and ensure the duplicated image is a faithful copy of the original. Particularly useful when Particle output is involved. (Particle output is CPU intensive and two different PO objects will likely have different patterns at any moment).
The arrangement of objects for the above image will look like this:
And you can find this “Frame buffer” object in the usual place:
So, what happen if two FB objects are placed on consecutive layers?
The previous definition still holds— Anything above this Frame buffer layer (including previous frame buffer objects) are combined and represented by this frame buffer object.