[Radiance-general] Re: Whats causing these problems in my pics?

[Greg Ward]

> From: Georg Mischler <schorsch at schorsch.com>
> Date: March 28, 2004 7:47:23 AM PST
>
> John Sutherland wrote:
>
>> Whats causing the blotching in the dark corners of objects?
>> ...
>>
>> -x 2560 -y 2048 -ar 128 -ad 512 -aa .15 -as 256 -ab 3
>
> You have -ad and -as at relatively soft settings, but your -aa is
> quite tough in comparison. I assume it is known that -as should
> usually be half of -ad, and that increasing both will reduce
> splotches in most cases. What is less known is that -aa needs to
> be in balance with them as well. The right balance may depend on
> your scene, but often when increasing -ad/-as doesn't eliminate all
> artifacts, you can take this as an indication that -aa is too small.
>
> In fact, if you want a fast, relatively inaccurate, but sill nice
> looking rendering, one possible way to get that is to increase
> -aa more than you normally would. In fact, I whish rvu had a
> higher default setting for -aa...

This seems a reasonable suggestion, so I went ahead and increased the 
default -aa parameter a bit.  I rarely use the defaults, myself, but 
these will be the new values.  (I didn't change rad since the last 
alteration).

	rvu	rpict	rtrace
-aa	0.3	0.2	0.15
-ad	256	512	1024
-as	64	128	512

-Greg