i know about reflection value but that doesn't change the "Falloff" or depth of the reflection.

in the attached image, you can see the 3d being reflected below the "sanctum" text. 

If i wanted it sitting on a mirror this would be great but I would prefer that it did not reflect the 3d to the absolute bottom of the image. i would even be more pleased if the very bottom of the "sanctum" reflection even faded out ( to black for this picture )