Could this be down to max_trace_level?

I have read before that black dots in a translucent/reflective object 
could be caused by too low max_trace_level.

Dave.

Bruno Cabasson wrote:
> "etrask" <et7### [at] yahoocom> wrote:
> 
>>I have not checked your code, but perhaps you could try moving the glass
>>block upwards very slightly, to make sure there is not a coincident surface
>>at the bottom. This could cause the strange dots you see at the top.
>>
>>But if there is no coincident surface down there, then I am just rambling
>>for no apparent reason. =P
>>
>>I like your picture though, very neat. Only thing I could suggest is perhaps
>>to get the glyphs to stand out a bit more.
>>
>>"Burki" <nomail@nomail> wrote:
>>
>>>Hi all !
>>>
>>>
>>>A Mayan stela with the date glyphs of Dec-21-2005.
>>>
>>>
>>>
>>>Any idea how to get rid of the silly dots on top of the stela?
>>>It is an isosurface with function f_superellipsoid. But these dots also turn
>>>up when using a real superelli of the same size and material.
>>>Find the code at povray.binaries.scene-files with the same subject name.
>>>
>>>Comments welcome!
>>>
>>>
>>>Yours,
>>>Bu.
> 
> 
> I tried to follow etrask's idea and moved the stella a little upward, but
> it still persist. I also tried to reduce the accuracy of the
> isosurface down to 0.00001, but still the same. I also tried to put a white
> plane above the whole scene in case it would come from reflection of the
> black sky ...
> 
> I just notice that the bottom of the stella renders quite dark.
> 
> Maybe someone else can help you. Could it be a numerical artifact (things go
> better with a box instead of superllipsoid-like shape)? Anyway, I wonder
> why this undesirable effect...
> 
> Regards.
> 
>     Bruno.
> 
>

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