In article <3F4### [at] informatikuni-freiburgde> , Mark Weyer 
<wey### [at] informatikuni-freiburgde>  wrote:

> You refer to fill-lights. According to the docs
> those are shadowless.

There is no concept of fill-lights in POV-Ray itself.  The docs use that
term for lights which gives the whole scene more light without altering it
otherwise.

Light groups don't really do that, but they indeed follow a similar idea:
They are most useful to add light to some parts of a scene that would
otherwise be too dark.  Especially in high-end animations this is used to
improve realism (or create some effect) compared to a real scene.  They add
realism to a computer generated image in particular if there is no or only a
simple model of global illumination (i.e. radiosity for animations is
expensive to compute).

Thus, you are kind of right - light groups are very useful when being
shadowless.  They are not intended as a separately lit scene inside a scene.
Of course, such a feature could be added, and probably will sometime in the
distant future.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

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