According to Michael Bay, the key to making the robots look real was lighting. Each and every component of the robots had to reflect light like real metal. Photographs of each set were taken to use as a lighting reference to recreate the scene with the robots, and extensive use of ray tracing (a light reflection technique) was carried out. However, there were a variety of light sources (optics, headlights, lamps, sunlight, et cetera), which had to reflect off a variety of surfaces (which had different textures), which made ray tracing an arduous task to perform.

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