>> Hmmm ... IIRC aren't there a couple of parameters that /have/ to be
>> the same during the save AND load passes in order to get the best
>> results ... count and error_bound seem to be ringing a bell.
>
> Yes, and I'm using the same for both passes, except for pretrace start
> and end, which I set to 1 on the second pass to save time. Also, until
> now I was turning always_sample off in order to save more time, without
> realizing that it was not necessary because there is no pretrace step on
> the second pass.
>
>>
>> Having to specify always_sample on during load DOES seem to be
>> contrary to why you would say off (default) ... time savings
>>
>> The doc passage:
>> http://wiki.povray.org/content/Documentation:Reference_Section_3.2#always_sample
>>
>>
>> seems to being saying that there MAY be cases that you would have
>> to "override the behavior"
>>
>
> As I said to Warp, I see now that I was misunderstanding what it does...
>
> Anyhow, I still don't get it: you would think that taking more samples
> will be slow, but always better to reduce artifacts and get more
> quality, isn't?
>
> Also, I don't understand why I get really weird, random artifacts if I
> turn it off during the load pass (they were not there during the first
> pass, for sure). I'm not using pretrace on the second pass (by setting
> it to 1), so you would think that it should not matter if always_sample
> is on or off...
>

If you want to totaly suppress the pretrace step, don't change 
pretrace_start. Just set pretrace_end to a value larger than 0.08, like 
pretrace_end 1.




Alain

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