#38 Distance fading for CMOD points

[ajtribick]

Some provision to fade out points in a CMOD would be useful. For example in Cham's accretion disk add-on (http://www.shatters.net/forum/viewtopic.php?t=10827) the surface brightness goes up as distance increases which limits the technique's usefulness - fading the points with distance (perhaps by decreasing their opacity) would be extremely useful, perhaps also adding a parameter to specify the length scale over which this fading occurs.