> -> Parralel light, or very far light source, so that it seems parralel

There's the parallel keyword for lightsources, use it with point_at in the
lightsource and your good to go.

> -> No 100% black shadow : the objects around me reflect light a little bit
> and light my shadow : in real life, during the day, there are very few
100%
> black shadow...

You might want to look at radiosity, or using shadowless lights to crudely
model the way light bounces off of objects and illuminates the shadows.
Three-point-lighting is another term you might want to google.

> -> When a non-sun-like light source make a shafow, THIS shadow is black,
> only sun-like light source can have smooth shadow...

Arealights takes care of sharp and smooth shadows, depend on how big you set
them.


Hope that gets you started.

Regards,
Tim

-- 
aka "Tim Nikias"
Homepage: <http://www.nolights.de>

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