What is Angular Discretization? Should I change it?

It defines the number of control angles that are used to discretize each octant of the angular space. By default, the number of Theta Divisions and the number of Phi Divisions are both set to 2. For most practical problems, these settings are acceptable, however, a setting of 2 is considered to be a coarse estimate. Increasing the discretization of Theta Divisions and Phi Divisions to a minimum of 3, or up to 5, will achieve more reliable results.

A finer angular discretization can be specified to better resolve the influence of small geometric features or strong spatial variations in temperature, but larger numbers of Theta Divisions and Phi Divisions will add to the cost of the computation. If the angular discretization is too coarse, abrupt changes in the temperature field will be noticed between the divisions.

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