"Peter T. Mayer" <nomail@nomail> wrote in message 
news:web.41ecc9f82fb492d1173073970@news.povray.org...
> laser beam does not start at the point where the incomming beam hits the
> mirror, but somewhere above the mirror, this looks not very natural. What
> is wrong with my example?
>
> And second question, how can I achieve that the reflected beam is not so
> much scattered?

Hiya. Stumbling across your question here, hopefully I'll have the right 
answer.

Probably only a matter of adding a samples value so try that to prevent 
missing or artifact prone media. Oftentimes it needs to be 50 or more-- slow 
as that may be. At least I don't believe raising max_trace_level would help 
since this is only a few surfaces.

As to the scatter, well, it could be that you need to increase 'tightness' 
of your laser light. You might try using the 'parallel' keyword, too, 
although I don't think this will change anything in this scene as it is now.

I've rendered your script and tried a few things. Looks like that frame 
around the mirror could be confused as incorrect media appearance too, but 
what happens is that the illuminated media only seems brighter with that 
behind it. The grayness against the blackness makes a brightness change. 
However, media samples 100 really helps (photons part left the same).

Bob H.

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