Dear Colleagues,

  I am having trouble to get blob objects to work properly. I am using
blobs
to generate tube-like objects consisting of a great number of short
cylinders.
Povray 3.02 renders these blobs with lots of black dots on them. It
usually helps
to tweak blob_threshold a bit but so far these black dots never
disappear entirely.
I have tried may things which include using the keyword sturm, different
texture maps
at different positions i.e. individual and global but nothing seems to
help.
Does anyone have an idea why that might be (black dots) and possibly
know what to do about it ?
(The reason why I am using blobs is that I need to model transparent
tubes with round
ends. When I merge cylinders and spheres the whole thing gets terribly
slow -
so blobs are a lot faster but they don't seem to work.)
Any ideas ?
Thanks,

   Lothar Esser

------------------------------------------------------------------
Dr. Lothar Esser
Howard Hughes Medical Institute
5323 Harry Hines Blvd.
Dallas Texas 75235-9050
E-mail : ess### [at] chopswmededu
------------------------------------------------------------------

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Just a guess but try adding a line to your scene that says:

#global_settings{max_trace_level 10}

Try different values (higher) for max trace level if 10 does not work.

Ken Tyler

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P-R 3.1 blob received a bit of a fix since 3.02, perhaps that makes a 
difference. I wondered if you were using multiple blob statements or a single 
one with multiple components? If more than one blob is being strung together 
in a union or merge it could be same-surface problem.

Message <365CB150.7921D942@chop.swmed.edu>, Lothar Esser  typed...
>
>Dear Colleagues,
>
>  I am having trouble to get blob objects to work properly. I am using
>blobs
>to generate tube-like objects consisting of a great number of short
>cylinders.
>Povray 3.02 renders these blobs with lots of black dots on them. It
>usually helps
>to tweak blob_threshold a bit but so far these black dots never
>disappear entirely.
>I have tried may things which include using the keyword sturm, different
>texture maps
>at different positions i.e. individual and global but nothing seems to
>help.
>Does anyone have an idea why that might be (black dots) and possibly
>know what to do about it ?
>(The reason why I am using blobs is that I need to model transparent
>tubes with round
>ends. When I merge cylinders and spheres the whole thing gets terribly
>slow -
>so blobs are a lot faster but they don't seem to work.)
>Any ideas ?
>Thanks,
>
>   Lothar Esser
>
>------------------------------------------------------------------
>Dr. Lothar Esser
>Howard Hughes Medical Institute
>5323 Harry Hines Blvd.
>Dallas Texas 75235-9050
>E-mail : ess### [at] chopswmededu
>------------------------------------------------------------------
>
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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Try this as a last resort, put hierarchy off inside the blob statement.
I've done animations where the internal bounding of blobs caused serious
problems.

Since you are using transparent blobs, you probably just need to raise
max_trace_level though.

-Mike


> Povray 3.02 renders these blobs with lots of black dots on them. It
> usually helps
> to tweak blob_threshold a bit but so far these black dots never
> disappear entirely.
> I have tried may things which include using the keyword sturm, different
> texture maps
> at different positions i.e. individual and global but nothing seems to
> help.
> Does anyone have an idea why that might be (black dots) and possibly
> know what to do about it ?
> (The reason why I am using blobs is that I need to model transparent
> tubes with round
> ends. When I merge cylinders and spheres the whole thing gets terribly
> slow -
> so blobs are a lot faster but they don't seem to work.)
> Any ideas ?
> Thanks,
>

Post a reply to this message