According to Business Insider, who looked into exactly what was going to be needed, the answer is, quite a bit.
Then the rendering would need to be mapped to Cavill’s actual face in the shots.
Then this rendering would need to be properly shaded in order to look realistic.
Because we assume that Cavill is going to be moving around during these scenes, a full 3D rendering of the actor’s face will need to be created.
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