> To disable caching, just add the keyword "no_cache" to the radiosity
> block. Make sure to not set the "count" parameter too high - a value as
> low as 10 is perfectly ok for this approach.
>
> As for the mode 3 oversampling, this mode is driven by a stochastic
> algorithm, similar to focal blur; the +a parameter specifies the
> /variance/, and the +ac parameter specifies the /confidence/.
>
> In layman's terms, the mode 3 is all about estimates: While it renders
> pixels over and over again, it estimates (A) the colour of the pixel,
> (B) the error in the estimated colour, i.e. how much it still differs
> from the actual value, and (C) the reliability of the error estimate.
> The +a parameter specifies the maximum estimated error you are willing
> to accept, while the +ac parameter specifies the minimum reliability you
> demand for that error estimate.
>
> In even simpler terms, the +a parameter affects the amount of general
> noise in the resulting image, while the +ac parameter affects the amount
> of speckle artifacts.
>
> (Last not least, the +r parameter puts a hard maximum on the number of
> samples per pixel. The effective limit is 4 to the power of the
> parameter value, making it approximately the same as for a worst-case
> scenario in anti-aliasing mode 2.)

Thanks, I look forward to having a play. I will have to dig out my 
original scene of a TV stand that just refused to work with radiosity 
and led me to MCpov  in the first place.

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