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After you have solved the scene, you can optionally use SynthEyes to calculate the position of, or at least direction to, principal lights affecting the scene. You might determine the location of a spotlight on the set, or the direction to the sun outdoors. You can also use SynthEyes to track fluctuations in on-set lighting due especially to explosions or flashing lights, which can otherwise wreak havoc for matching. In these cases, knowing the lighting will help you match your computer-graphic scene to the live footage.
SynthEyes can use either shadows or highlights to locate the lights. For shadow tracking, you must track both the object casting the shadow, and the shadow itself, determining a 3-D location for each. For highlight tracking, you will track a moving highlight (mainly in 2-D), and you must create a 3-D mesh (generally from an external modeling application, or a SynthEyes 3-D primitive) that exactly matches the geometry on which the highlight is reflected.
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