A while ago, on the Renderosity forums, someone pointed out an
unusual problem in Vue: glass was looking blue, even though it
should have been clear!
Now, I wasn't the fella who figured out the answer, nor can I
recall which clever person did, sorry! But here's what the problem
was, and a simple solution :)
In CGI, goo renderers use "ray tracing" to work out
how images should look. They beam out rays of light from the camera
and work out how they'd bounce around and pick up colours.
The problem with glass is "internal reflections": light
will bounce around inside glass, gemstones and the like, several
times, before coming out. Now, the renderer has a problem, in
that this may take a lot of bounces and a LOT of render time,
or, it can bug and keep bouncing infinitely, so your render would
never finish, eeek!
So, the renderer has a setting that sets how often it will count
bounces, over that limit, it simply stops, and that's what causes
the glass to look blue! You can see the effect in the pic below.
The fix is very easy though :) All you need to
do is increase your renderer's number of maximum light bouncs.
In Vue, you open your render settings, select
USER SETTINGS, then open the "Edit" button beside
the "trace reflections" tab.
Then increase the amount up. Now, you can raise
it to maximum, or even type in a higher number if need, or try
a lower number if you wish to find a setting that will render
quicker but sitll look ok.