@bepeg4d : Thanks Beppe ! Now I understand better ! I tried several times to duplicate the RenderTarget node without success, and so I didn't understand the process. I have just understood that the background would be a node connected to an input pin of the RenderTarget.dear roubal,
this is exactly the point for having a background node inside the render target, so you could easily connect different cameras with the same background or having different backgrounds nodes for testing with the same camera
ciao beppe
This said, as a the perspective necessarily changes when you move the camera, we would have to change both the camera node and the background node to change the angle of view. This may allow more versatility in some situations (I don't see one currently), but may be a loss of time in most cases imho.
Connecting the background to the camera would allow very fast switch between cameras/angles of view.
I am not very familiar with some nodes. Have I missed something ?