This is an interesting application of digital projection technique, as the computer calculating the overlay needs to establish realtime vanishing points, camera angles, and optical precision. In a way, it is the fulfillment of a promise made by the earliest of perspective demonstrations. In the early 15th century, Filippo Brunelleschi “proved” his method of drawing realistic perspective using a mirror and his painting of the baptistry of Florence:
The painting’s vanishing point was drilled out, allowing the visitor to peer through the point from behind the panel. The viewer stands in front of the real Baptistry with a mirror in between the scene and the panel. Moving the mirror was to demonstrate the perspective’s fidelity through the virtual overlay, through the lack of change between image and the real. Brunelleschi used silver leaf in the sky of the panel, to reflect the sky in a luminous manner, rather than paint static clouds. The demonstration, with the precise alignment of painting and real, with algorithmically derived projector lines to simulate perceptual geometry, is a great leap in the history of virtuality. The addition of the real clouds mirrored in the specular finish, to blend aspects of the real with the virtual simulation, belongs to the ancestry of what would become augmented reality. (http://projectionsystems.wordpress.com)
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