ok, thanks to all
my trouble was about the format of vertex only on ####.#### that can to
degenerate triangle losing last decimals ...
if the #debug cannot try them out, I have to control the triangle again after
the formatting procedure of my parser
no proble... this is my parser working
sketch-up , cad, pov STL ..

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"GioSeregni" <gms### [at] hotmailcom> wrote:
> ok, thanks to all
> my trouble was about the format of vertex only on ####.####

Is there a way to filter out those triangles from the start?
Are they even necessary / visible?

You can probably test just the fractional portion of your double/float by using
modulo.

#if (mod(Number, 1) < threshold) then ignore triangle #else keep it #end

- BE

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> "GioSeregni" <gms### [at] hotmailcom> wrote:
> > ok, thanks to all
> > my trouble was about the format of vertex only on ####.####
>
> Is there a way to filter out those triangles from the start?
> Are they even necessary / visible?
>
> You can probably test just the fractional portion of your double/float by using
> modulo.
>
> #if (mod(Number, 1) < threshold) then ignore triangle #else keep it #end
>
> - BE

Unfortunately, it's more complicated. If the mod exists beyond a certain decimal
point, the parser must first clean up the vertex by the small part of float,
then check if a twin face exists.
I'll have to create a twin face search loop after writing the mesh with
formatting that trims small decimal points... that is, a loop nested within
another loop... a lot of runtime.
povray forgives a duplicate face, but the other formats I use do not (for an STL
this is a serious mistake)

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Nothing, I think the most efficient solution is to ignore float comparisons,
much less divisions.
But create the pov file as a temporary one, and reprocess it by comparing
vertices with string functions. If a triangle has two equal vertices, it should
be removed.

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