A test with sunbeams and one with a spherical edge to the upper world view.
The circular window is achieved by making a sphere, inverting the normals and cutting a hole. The camera then sees and renders the inside of the sphere as the skybox, and looks through the hole to display the other character.
The sphere then gets rendered by the second camera, but not the first one. Also, it's upside-down because of how the camera is oriented and mirrored, so that's fun.
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