[Radiance-general] Still having trouble, new pics........

[John Sutherland]

Firstly Guilio,
	Yes im using mkillum , the sources are about the equivalent of a
few cm behind the windows and they are shining in through the glass. Do
you still think there might be something up to do with the mkillum?

Secondly Georg , I was following the rendering parameters suggested by 

http://radsite.lbl.gov/radiance/refer/Notes/rpict_options.html

Which suggests that 512 and 256 for ad and as is accurate? My mistake if
they are not, but im trying double that now anyway. Cheers guys.....
John

-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Georg
Mischler
Sent: 29 March 2004 19:27
To: Radiance general discussion
Subject: Re: [Radiance-general] Still having trouble, new pics........

John Sutherland wrote:

> Secondly, was a bit confused by Georg's advice when you said -aa
should
> be increased, did you mean increased in accuracy? ie putting aa to a
> lower value? Or did you mean increasing aa by setting it to a higher
> value? Because the lower the aa value the more accurate the picture,
so
> I can only see setting aa lower than .15 as a good thing not higher?

Increasing a parameter means to give it a higher numeric value.
Increasing -aa will result in lower accuracy. But since you have
-ad and -as at relatively inaccurate settings, that would result
in a better balance. Alternatively, you can increase -ad and -as,
which also results in better balance, with better accuracy
overall, but taking (possibly much) more time to render.
In either direction you will eventually find a combination that
reduces or even eliminates the artifacts.


> Well anyway I definitely don't think aa is the problem anyway.

There's hardly ever a single parameter responsible for specific
artifacts. They all need to play together in the right way.

Your new pictures are a nice demonstration of what happens when
you disturb the balance even more than was first the case.
I actually suspect that the original builders of that space
would have been very happy if they could have produced such
an effect in reality! ;)


-schorsch

-- 
Georg Mischler  --  simulations developer  --  schorsch at schorsch com
+schorsch.com+  --  lighting design tools  --  http://www.schorsch.com/

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