CascadeTransitionFraction

Proportion of the fade region between cascades. Pixels within the fade region of two cascades have their shadows blended to avoid hard transitions between quality levels. A value of zero eliminates the fade region, creating hard transitions. Higher values increase the size of the fade region, creating a more gradual transition between cascades. The value is expressed as a percentage proportion (i.e. 0.1 = 10% overlap). Ideal values are the smallest possible which still hide the transition. An increased fade region size causes an increase in shadow rendering cost.