Reflection Falloff
reflection-falloff
The reflection-falloff parameter fades the reflection out along its length, from 0 to 100. It defaults to 100, which fades it to nothing by the far end.
0 keeps the reflection at an even opacity for its whole length, which reads as a mirror rather than a floor. Values in between stop the fade short, leaving a visible edge where the reflection ends.
The default is almost always what you want: a reflection that stops abruptly announces itself as an effect. Values are clamped to 0-100.

