I've experimented with fading out.
I changed the values to 20 and 10,
but I can't see anything happening.
Has somebody better results?
From Wiki:
"fading out
Usually models are invisible if the distance between them and the camera is greater than a certain value defined in the level of detail. In some cases it is desired that models do not get invisible instantly but fade out slowly when the distance gets large. This can be achieved by setting the fade_out_range
property values to the range in which the material should fade out from full visibility to invisibility:
"