On 9-1-2018 16:07, Bald Eagle wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 5-1-2018 17:38, Norbert Kern wrote:
> 
>>> By the way - Thomas - what software can be used to retriangulate an existing
>>> mesh?
> 
> 
>> Not sure what retriangulate means really, but I would think of Poseray.
> 
> I came across a bunch of programs, macros, and tools while I was looking into
> Voronoi diagrams and Delaunay triangulations, and optimizing convex hulls.
> 
> I might start with Voro++ and see what
> http://paulbourke.net/papers/triangulate/
> has to offer.
> 
> I'm sure there are plenty of others as well.
> 
> 
> 

I see. In my world that is called subdivision. ;-)

As I said, Poseray has always done an excellent job for me when it came 
to further subdivide an existing mesh. I prefer to do it however, within 
the program that created the mesh in the first place (i.e. Silo for me) 
and at the end of the modelling process, otherwise the mesh becomes too 
heavy to work with.

-- 
Thomas

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On 10/01/2018 08:24, Thomas de Groot wrote:
> On 9-1-2018 16:07, Bald Eagle wrote:
>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>> On 5-1-2018 17:38, Norbert Kern wrote:
>>
>>>> By the way - Thomas - what software can be used to retriangulate an 
>>>> existing
>>>> mesh?
>>
>>
>>> Not sure what retriangulate means really, but I would think of Poseray.
>>
>> I came across a bunch of programs, macros, and tools while I was 
>> looking into
>> Voronoi diagrams and Delaunay triangulations, and optimizing convex 
>> hulls.
>>
>> I might start with Voro++ and see what
>> http://paulbourke.net/papers/triangulate/
>> has to offer.
>>
>> I'm sure there are plenty of others as well.
>>
>>
>>
> 
> I see. In my world that is called subdivision. ;-)
> 

And I took it to be the other way around.

> As I said, Poseray has always done an excellent job for me when it came 
> to further subdivide an existing mesh. I prefer to do it however, within 
> the program that created the mesh in the first place (i.e. Silo for me) 
> and at the end of the modelling process, otherwise the mesh becomes too 
> heavy to work with.
> 

True, subdivision is one of the last things to do.

-- 

Regards
     Stephen

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Thomas de Groot <tho### [at] degrootorg> wrote:

> I see. In my world that is called subdivision. ;-)

Well, it's not technically SUBdivision - it's just taking the mesh as it's
divided, and reconnecting the vertices so that the triangles are less narrow /
more regular.

Just a reshuffling of the interconnectivity.

If you fold a piece of paper one way or the other, it's still only folded in
half - just one way is "lengthwise" and the other way is "widthwise".

Which I think is what he's after.

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On 10-1-2018 14:39, Bald Eagle wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>> I see. In my world that is called subdivision. ;-)
> 
> Well, it's not technically SUBdivision - it's just taking the mesh as it's
> divided, and reconnecting the vertices so that the triangles are less narrow /
> more regular.
> 
> Just a reshuffling of the interconnectivity.
> 
> If you fold a piece of paper one way or the other, it's still only folded in
> half - just one way is "lengthwise" and the other way is "widthwise".
> 
> Which I think is what he's after.
> 

Ah! indeed, that's something else. I have no experience with that technique.

-- 
Thomas

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Thomas de Groot <tho### [at] degrootorg> wrote:

> Just back online from a modem crash. Been offline for nearly a week
> (very nice indeed) ;-)
>
> This looks very good, Norbert!
>
> Not sure what retriangulate means really, but I would think of Poseray.
>
> --
> Thomas


Sorry for answering late...

I refer to this message, were you described your way to deal with mesh issues
causing spikes -
http://news.povray.org/povray.binaries.images/message/%3C5a268b58%241%40news.povray.org%3E/#%3C5a268b58%241%40news.povr
ay.org%3E.

Of course I've the same problems - up to now it works by playing with the inside
vector of meshes, but it's not an elegant way.


Norbert

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On 11/01/2018 15:16, Norbert Kern wrote:

> 
> 
> Thomas de Groot <tho### [at] degrootorg> wrote:
> 
>> Just back online from a modem crash. Been offline for nearly a week
>> (very nice indeed) ;-)
>>
>> This looks very good, Norbert!
>>
>> Not sure what retriangulate means really, but I would think of Poseray.
>>
>> --
>> Thomas
> 
> 
> Sorry for answering late...
> 
> I refer to this message, were you described your way to deal with mesh issues
> causing spikes -
>
http://news.povray.org/povray.binaries.images/message/%3C5a268b58%241%40news.povray.org%3E/#%3C5a268b58%241%40news.povr
> ay.org%3E.
> 
> Of course I've the same problems - up to now it works by playing with the inside
> vector of meshes, but it's not an elegant way.
> 
> 

Thomas uses Silo as a mesh editor (99 USD today), I use Blender to fill 
holes in meshes (Zero LSD bur a steep learning curve) to fill in holes 
in meshes.
Here is a link for Mesh repair tools.

http://meshrepair.org/


-- 

Regards
     Stephen

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"Norbert Kern" <nor### [at] t-onlinede> wrote:

> Sorry for answering late...
>
> I refer to this message, were you described your way to deal with mesh issues
> causing spikes -

If you want repair a broken mesh that has holes, I've used Netfabb successfully
in the past, and I think there were 1 or 2 others that I've used - I'd have to
take a look at my old laptop...

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> "Norbert Kern" <nor### [at] t-onlinede> wrote:
>
> > Sorry for answering late...
> >
> > I refer to this message, were you described your way to deal with mesh issues
> > causing spikes -
>
> If you want repair a broken mesh that has holes, I've used Netfabb successfully
> in the past, and I think there were 1 or 2 others that I've used - I'd have to
> take a look at my old laptop...

Repairing meshes - especially filling holes - is one of many features of the
free tool MeshLab:
(http://www.meshlab.net)
It works well in most cases but crashes sometimes.

Best regards
Michael

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On 11-1-2018 23:12, MichaelJF wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
>> "Norbert Kern" <nor### [at] t-onlinede> wrote:
>>
>>> Sorry for answering late...
>>>
>>> I refer to this message, were you described your way to deal with mesh issues
>>> causing spikes -
>>
>> If you want repair a broken mesh that has holes, I've used Netfabb successfully
>> in the past, and I think there were 1 or 2 others that I've used - I'd have to
>> take a look at my old laptop...
> 
> Repairing meshes - especially filling holes - is one of many features of the
> free tool MeshLab:
> (http://www.meshlab.net)
> It works well in most cases but crashes sometimes.
> 
> Best regards
> Michael
> 
> 

Argh! Of course! I /have/ Meshlab and always forget to use it. ;-)
I remember good results indeed with this issue. Thanks indeed for the 
reminder!

-- 
Thomas

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Nice work !

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