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<div class="moz-cite-prefix">On 06/20/15 07:12, Ivan Paulos Tomé
wrote:<br>
</div>
<blockquote
cite="mid:CA+Zt8s5uuhroeDWpc65pzJyeFivq6dL7E8d2jP8G7fQS-8EMUg@mail.gmail.com"
type="cite">
<pre wrap="">Hi friends !
The question about double sided and single sided faces, and manifold
or non-manifold meshes is related to it's normals.
The normal of the face is the face that is shaded.
Normals, are generally pointed to a single side of the objects. And
normally, because of the shading, normals are pointed (when we have
closed meshes) externally to the world.
The standard in the majority of the softwares, is to have a single
sided face (only one normal per face, which means that the materials
assigned will only be detected and rendered at the normal direction),
but for compatibility with game engines, we can make Blender have
double sided faces too.
A manifold mesh is a mesh which faces are completely pointing to the
outside or to the inside of the mesh, if you recalculate those
normals, they will always point at a single direction (outside or
inside).
A non-manifold mesh is a mesh in which we can't determine the outside
and the inside of the mesh, because the normals will *always" point at
diferent directions, and it doesn't matter if we recalculate them
using a tool or flip them manually, due to the way that the structure
of the mesh is conected.</pre>
</blockquote>
Well, it is possible to have non-manifold meshes with consistent
normals (e.g. a 2D plane)<br>
And it's possible to have manifold geometry which cannot have
consistent normals (e.g. a <a
href="https://en.wikipedia.org/wiki/Klein_bottle">klien bottle</a>)<br>
<br>
So this definition doesn't hold up under all circumstances.<br>
<br>
The manual doesn't really attempt to define it beyond saying
"non-manifold geometry cannot exist in the real world", but this too
is slightly misleading (klien bottles are manifold, but they cannot
exist in the real world because they intersect themselves).<br>
Perhaps it would be nice to write up a detailed explanation of all
this on the manual somewhere (like <a
href="http://blender.stackexchange.com/q/7910/599">this</a>, but
better).<br>
<br>
<blockquote
cite="mid:CA+Zt8s5uuhroeDWpc65pzJyeFivq6dL7E8d2jP8G7fQS-8EMUg@mail.gmail.com"
type="cite">
<pre wrap="">
Cheers !
2015-06-20 7:00 GMT-03:00, <a class="moz-txt-link-abbreviated" href="mailto:bf-docboard-request@blender.org">bf-docboard-request@blender.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:bf-docboard-request@blender.org"><bf-docboard-request@blender.org></a>:
</pre>
<blockquote type="cite">
<pre wrap="">Send Bf-docboard mailing list submissions to
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Today's Topics:
1. Some weak points in the documentation. (<a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>)
2. Re: Some weak points in the documentation. (gandalf3)
3. Re: Some weak points in the documentation. (<a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>)
4. Re: Some weak points in the documentation. (<a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>)
----------------------------------------------------------------------
Message: 1
Date: Sat, 20 Jun 2015 00:21:12 -0400 (EDT)
From: <a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>
Subject: [Bf-docboard] Some weak points in the documentation.
To: "Blender Documentation Project" <a class="moz-txt-link-rfc2396E" href="mailto:bf-docboard@blender.org"><bf-docboard@blender.org></a>
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:65486.99.58.2.94.1434774072.squirrel@webmail.core.com"><65486.99.58.2.94.1434774072.squirrel@webmail.core.com></a>
Content-Type: text/plain; charset="iso-8859-1"
Friends,
While answering a question on Blender Stack Exchange,
I went looking for some things in the manual that I thought should be
there, but were not.
1) Any information on what Blender
considers to be an interior face. There was no entry in the glossary, and
doing a search using the parameter "interior faces" did not
provide any hits. The only explanation I located was in the tool tip,
where a hidden face is defines as a face where all of the edges of the
face have more than 2 face users.
2) I could also not find any
information on removing non-manifold bits of a mesh when I attempted to
search on "non manifold".
Both interior faces
and? non-manifold are items in the select menu of the 3D viewport
header.
I'd add them myself, but haven't been able to rustle up
enough time to learn to make the edits.
Noel Stoutenburg
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Message: 2
Date: Fri, 19 Jun 2015 23:44:55 -0700
From: gandalf3 <a class="moz-txt-link-rfc2396E" href="mailto:zzyxpaw@gmail.com"><zzyxpaw@gmail.com></a>
Subject: Re: [Bf-docboard] Some weak points in the documentation.
To: Blender Documentation Project <a class="moz-txt-link-rfc2396E" href="mailto:bf-docboard@blender.org"><bf-docboard@blender.org></a>
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:55850BE7.4040103@gmail.com"><55850BE7.4040103@gmail.com></a>
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On 06/19/15 21:21, <a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Friends,
While answering a question on Blender Stack Exchange, I went looking
for some things in the manual that I thought should be there, but were
not.
1) Any information on what Blender considers to be an interior face.
There was no entry in the glossary, and doing a search using the
parameter "interior faces" did not provide any hits. The only
explanation I located was in the tool tip, where a hidden face is
defines as a face where all of the edges of the face have more than 2
face users.
2) I could also not find any information on removing non-manifold bits
of a mesh when I attempted to search on "non manifold".
Both interior faces and non-manifold are items in the select menu of
the 3D viewport header.
I'd add them myself, but haven't been able to rustle up enough time to
learn to make the edits.
Noel Stoutenburg
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</pre>
</blockquote>
<pre wrap="">They are here:
<a class="moz-txt-link-freetext" href="http://blender.org/manual/modeling/meshes/selecting/advanced.html">http://blender.org/manual/modeling/meshes/selecting/advanced.html</a>
Not sure why 'non manifold' and 'non-manifold' don't turn up any
results, but 'manifold' gives some.
--
-gandalf3
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Message: 3
Date: Sat, 20 Jun 2015 04:08:51 -0400 (EDT)
From: <a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>
Subject: Re: [Bf-docboard] Some weak points in the documentation.
To: <a class="moz-txt-link-abbreviated" href="mailto:bf-docboard@blender.org">bf-docboard@blender.org</a>
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:51458.99.58.2.94.1434787731.squirrel@webmail.core.com"><51458.99.58.2.94.1434787731.squirrel@webmail.core.com></a>
Content-Type: text/plain; charset="iso-8859-1"
Gandalf3,
Regarding your question:
</pre>
<blockquote type="cite">
<pre wrap="">? Not
</pre>
</blockquote>
<pre wrap="">sure why 'non manifold' and 'non-manifold' don't turn up any results,
but 'manifold' gives some.
I can't explain "non
manifold", but "non-manifold" does not appear, because in
every instance there is a space between the hyphen and the word
"manifold", , and if the search facilities are case sensitive,
both the initial letters N and M are capitalized, so "Non-
Manifold.
Noel Stoutenburg
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Message: 4
Date: Sat, 20 Jun 2015 04:27:38 -0400 (EDT)
From: <a class="moz-txt-link-abbreviated" href="mailto:brasshat@core.com">brasshat@core.com</a>
Subject: Re: [Bf-docboard] Some weak points in the documentation.
To: "Blender Documentation Project" <a class="moz-txt-link-rfc2396E" href="mailto:bf-docboard@blender.org"><bf-docboard@blender.org></a>
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:51715.99.58.2.94.1434788858.squirrel@webmail.core.com"><51715.99.58.2.94.1434788858.squirrel@webmail.core.com></a>
Content-Type: text/plain; charset="iso-8859-1"
Ooops.?
I didn't look closely enough. and found after
hitting the "send" button that this statement,
</pre>
<blockquote type="cite">
<pre wrap="">
</pre>
</blockquote>
<pre wrap="">both the initial letters N and M are capitalized, so "Non-
</pre>
<blockquote type="cite">
<pre wrap="">
</pre>
</blockquote>
<pre wrap="">Manifold.
is not accurate.
Noel Stoutenburg
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</pre>
</blockquote>
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</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
-gandalf3</pre>
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