Splits the view frustum by depth and gives each slice its own shadow map, so texel density roughly tracks screen-space size instead of being wasted on the far distance.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Shadow Mappingone map cannot cover a whole frustum's depth range