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This pixel filter limits the distance values stored in the depth buffer during rendering. Any distance greater than the limit will be set to the limit.
The reason for this is to improve the quality of depth buffer anti-aliasing in cases where huge distances are stored in the depth buffer (such as rendering on a blank backdrop or using certain volumetric renderers such as xStream).
A sensible value would be a bit higher than the biggest distance that an items is away from the camera (taking the extent of the item into account of course).