Seconding the above question - the image in the slide makes it look like the cube was mirrored over both the X and the Y axes. Why is that the case, as opposed to just needing the mirror the cube over one (ie the Y) axis?
EDIT: Just kidding, this makes sense. With the model of the pinhole camera, light from the "top" of the cube would go through the camera and hit the bottom of the screen, and same with light from the left and right of the cube.
Which axes should we mirror this over?
Seconding the above question - the image in the slide makes it look like the cube was mirrored over both the X and the Y axes. Why is that the case, as opposed to just needing the mirror the cube over one (ie the Y) axis?
EDIT: Just kidding, this makes sense. With the model of the pinhole camera, light from the "top" of the cube would go through the camera and hit the bottom of the screen, and same with light from the left and right of the cube.