"RCRuiz" <ram### [at] hotmailcom> wrote in message 
news:web.43e66dbcefda1eb411f39d970@news.povray.org...
> "Bob Hughes" <omniverse@charter%net> wrote:
>> "RCRuiz" <ram### [at] hotmailcom> wrote in message
>> news:web.43e64c307d6d81aa11f39d970@news.povray.org...
>>
>> Coincident surfaces can be a common problem, in this case the media is
>> apparently affected
>
> nope, it did not fix the problem but thanks . .  I just found my error , 
> is
> in max_trace_level on the global settings I put 8 and problem fix :D

Curiously, I tried your script by replacing the declared object with box 
{-1,1} and placed one at +y so they overlap and max_trace_level 256 can't 
remove the artifacts. Only goes away when I scale one of them to 1.001. In 
fact, if I use scale 1.0001 the shadow shows a square but the media objects 
themselves seem okay.

I also gave larger media samples value a try and that didn't change the 
original problem.

Makes me wonder if your camera is positioned in a way that makes a 
difference. I did think at first that max_trace_level could be the fault 
since it wasn't an artifact showing at any actual side where surfaces would 
be coincident but changing that hasn't done anything here.

I'm surprised about the discrepency between rendered results we have, except 
it could be computer/version/other specific. Important thing is that you 
fixed it.

Bob Hughes

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