Le 14-04-22 12:24, Lars R. a écrit :
> Very exciting! :-)
>
> I still try to understand how it works in detail. ^^
>
>
> Btw, my Povray told me:
>
> |  Shutdown Warning: The maximum gradient found was 57.876, but
> |  max_gradient of the isosurface was set to 100.000. Adjust
> |  max_gradient to get a faster rendering of the isosurface.
>
>> isosurface {
>>          function {s (x,y,z)}
>>          contained_by {sphere {<0,0,0>,2.2}}
>>          max_gradient 100
>> […]
>
>
> I don't know how much faster the rendering would be with a lower
> max_gradient.
>
> Lars R.
>

Just try rendering using max_gradient 57.

You may also try replacing max_gradient as follow:

#declare Min_Factor = 0.6;
evaluate 57/Min_Factor, sqrt(1/Min_Factor), 0.7

Note: The documentation give the following formula for the second 
parameter, or overevaluation factor:
sqrt(found max_gradient/(found max_gradient * min_factor))
Whitch is the same as sqrt(1/min_factor)

Using evaluate is often faster than using max_gradient.




Alain

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