How to import or export from a compositor?
Input nodes are used to import footage into the Node Editor. Output nodes are used to export or display the result of a node graph. So, these nodes form the head and tail of the node flow drawn in Blender's node graph UI.
Input nodes
Input nodes are used to generate footage or to feed footage into the flow. These nodes don't have any input sockets. At any instance, there will be multiple types of inputs that a node flow might require, as shown in following screenshot and listed as follows:
A color or value
A procedurally generated pattern or texture
A rendered static or sequence of images
A movie clip
Data rendered through the active camera of the current scene
The Render Layers node
The Render Layers node inputs the rendered data through the active camera of the current scene. As shown in following screenshot, the node displays all the available passes, render layers and scenes present in the current rendered file. Multiple Render Layers nodes can be used...
