On 01/30/2014 07:04 AM, Doctor John wrote:
> On 29/01/14 10:30, John Greenwood wrote:
>
> John, I've realised why you are having a bit of difficulty with getting
> the max_gradient right for your isosurfaces.
>
> In v3.6, a warning was issued if you had set max_gradient too high or
> too low. In v3.7, that behaviour became broken (something to do with
> thread safety). In
>
http://news.povray.org/povray.beta-test/thread/%3C51c55b9f%241%40news.povray.org%3E/?mtop=384497
> some work-rounds are suggested but I can't get them to work.
>
>...
>
> John
>
John & John,
I believe we found previously that if you render the isosurface NOT 
wrapped in an object, the maximum gradient warning is issued in 3.7. I 
thought the idea was to document this issue, but I admit I lost track.

When you get warnings it was the case in 3.7, unless running one thread, 
the value might not be the absolute maximum seen because values are 
getting overwritten by differing threads.

Bill P.

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