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bluetree nous apporta ses lumieres en ce 2008/01/28 09:57:
> Alain <ele### [at] netscape net> wrote:
>> One window pane = 2 trace levels. You may have reatched the max_trace_level.
>> Also, each face count against the radiosity recursion_limit.
>> Anyway, it's effect is negligeable as the two faces are parallel.
>
> I'm not really sure, if I've understood that, sorry. :)
> So I had to use a max_trace_level of 7 instead of 5 and then I wouldn't have to
> delete the window glass?
> ....
>
Whenever you have a flat transparent object whose sides are hiden, and that
object is colourless and transparent, you can just remove it.
You need it only if it also reflect something significant. This is the case of
an interior night scene where the window reflect the room's content.
In the original render, the outside is relatively dark and the interior does
have some reflection in the window: leave the glass.
In the second render, the outside is much brighter and would have drownd the
reflection: revove the glass.
When you use radiosity, it's not only the max_trace_level that you need to
increase, you also need to increase recusion_level by 2, as each encoutered
surface count as a recursion_level.
What you can do, is to use the two pass technique.
On the first pass, you remove any weakly contributing transparent object and you
use save_file. You can render this pass with a lower resolution and no aa.
On the second pass, you put back the transparent objects, set "always_sample 0"
and load back the saved data with load_file.
--
Alain
-------------------------------------------------
WARNING: the crumsumpten of alcohol may Mack you tink you kan tpye reel gode
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