Far Shadow Cascades fade out based on the length of the Distance Field Shadows

Far Shadow Cascades are fading out based on the length of the Distance Field Shadows. Causing the shadows to cut out abruptly.

1. Set up a directional light with Distance Field Shadows
   • Add at least one Far shadow cascade on the cascaded shadow maps
2. Set the distance of the Far Shadow Cascade to 50,000
3. Set the Distance Field Shadows to 100,000
4. Set the Distance Fade on the cascaded shadow maps to 1

Results: The far shadow cascade will cut off abruptly at 50,000.

Expected: The Far Cascade should fade out based on its own distance.

The Far Shadow Cascade for the landscape is using the DistanceField Shadow Distance to calculate how to fade out