[opensource-dev] Review viewer -- draw distance slider

[Daniel]

What would directly tell people what the slider does is a ground outline 
on the terrain showing how far away items will be shown (similar to 
property lines ie shown directly on the ground).  Along with things 
starting to appear or vanish as they play with the slider, there should 
be no confusion about the function.

Along with that, provide a tooltip explaining the more area you see, the 
slower things will run.  If you want to cover the case of people flying 
or in a skybox, do it as a temporary horizontal ~50% opaque red circle 
centered on the avatar, which persists for several seconds after moving 
the slider.