"John VanSickle" <evi### [at] hotmailcom> wrote in message 
news:47c0e4c4@news.povray.org...
> Chris B wrote:
>
>> Oh and, just in case your problem is similar, I really should have 
>> mentioned the way I fixed it ...
>>
>> In my macro I added a check to detect where any more than two triangles 
>> shared an edge, then added a cylinder object to highlight that edge, so 
>> that, when I rendered in POV-Ray I could see where the problem in the 
>> mesh was and I could go back into the modeler to fix it.
>
> My modeler won't allow more than two faces to share an edge, so that's not 
> the issue.

The modeller may not consider them shared, but I'd be suprised if it 
prevented the edge of one pair of faces from becoming coincident with the 
edge of another pair of faces. It may record internally that these are not 
adjoining faces, but I think such information would be lost when 
exporting/converting to POV-Ray format. If the macro you use runs after 
you've converted to POV-Ray format then it may still be a possibile 
explanation.

Of course, if the macro is not building it's own map of which faces join 
together, for example if it's inside the modeller and has access to the 
information about which faces join, then it would rule this potential 
explanation out.

> If there was a problem like this with the mesh there would be very 
> significant subdivision artifacts.

I'm not sure that it would generate anything that would look particularly 
significant either in the modeller or in POV-Ray. When I got this problem 
there was nothing visible or distinctive in either. Subdivision just gives 
you more triangles within the existing triangles. If the original triangles 
look fine, then the subdivided ones look equally fine.

Regards,
Chris B.

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