Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In radiative heat transfer, a view factor, F_{A rarr B}, is the proportion of all that radiation which leaves surface A and strikes surface B. In a complex 'scene' there can be any number of different objects, which can be divided in turn into even more surfaces and surface segments. View factors are also sometimes known as configuration factors, form factors or shape factors. Confusion often arises when considering the radiation that arrives at a target surface. In that case, it generally does not make sense to sum view factors as view factor from A and view factor from B (above) are essentially different units. C may see 10% of A's radiation and 50% of Bs radiation and 20% of Cs radiation, but without knowing how much each radiates, it does not even make sense to say that C receives 80% of the total radiation.

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