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I'm not aware of any way to make the Camera display do what you want. It only takes in a single Image topic (together with a CameraInfo one).

You could perhaps place the images produced by the "second node" somewhere in RViz's 3D scene (and in the viewport of the Camera display). See #q227304 for a plugin that can do that.

I'm not aware of any way to make the Camera display do what you want. It only takes in a single Image topic (together with a CameraInfo one).

You could perhaps place the images produced by the "second node" somewhere in RViz's 3D scene (and in the viewport of the Camera display). See #q227304 for a plugin that can do that.

Alternatively, you could perhaps merge / overlay / blend the image(s) (streams) first, publish the result and then subscribe the Camera display to that.