yeah, er, sorry about the wrong place of posting... It won't happen anymore
In fact, there is a shadow casted by the object, but it is a more diffuse shadow,
where you don't recognize the shape of a cylinder, but ok, i'm just a beginner in
raytracing and I have sooooo much to learn in this subject, maybe in some months,
i'll find the exact way to render my object properly...

many thanks for your answer,
Sax

btw, i'll post another image with some air levels in the appropriate newsgroup,
if you want to check....

Bob Hughes wrote:

> Hi Sax, you missed the mark about where to post this image+question,
> povray.binaries.images would have been best.  Also posting a separate
> question-only at povray.general saying to have a look at the image at
> povray.binaries.images would be good.  Anyway, not as many people will see
> this here.
> To answer, 'no_shadow' (less the single quotes) can totally remove the shadow
> but only if this were CSG 'union', otherwise the individual cylinder objects
> can't have no_shadow applied in  a CSG 'difference' for example.  However, I
> find it hard to believe the shadow doesn't exist in real life although I
> cannot prove you wrong just now either.
> Hope that's of some help to you.
>
> Bob

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