screenSpaceErrorFactor
A factor used to increase the screen space error of terrain tiles when they are partially in fog. The effect is to reduce the number of terrain tiles requested for rendering. If set to zero, the feature will be disabled. If the value is increased for mountainous regions, less tiles will need to be requested, but the terrain meshes near the horizon may be a noticeably lower resolution. If the value is increased in a relatively flat area, there will be little noticeable change on the horizon.