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Full Version: V4 beta Oct-17-2018 available now - SubD to NURBS conversion

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From: Michael Gibson
17 Feb 2019   [#255] In reply to [#253]
Hi Andy,

> For the SubD conversion feature is it expected behaviour that when the NURBS objected generated has a
> boolean subtraction performed on it in MOI the edges generated from that can't be filleted without errors?
> I'm trying to work out if I'm making a mistake or just expecting too much from the feature.

Well it depends on the situation. In general that is not expected, however also filleting in MoI can have problems with complex chaotic geometry and it is pretty easy to have complex chaotic geometry with SubD conversions.

Is it possible for you to post the model so I can take a look at it? If you want to keep it private you can e-mail it to me at moi@moi3d.com, if it is very large you would need to use a file sharing service like Dropbox/OneDrive/etc... and send just a shared link through e-mail.

- Michael
From: Lordfox
25 Feb 2019   [#256]
Helo dear Micheal & dear users of Moi3D 4.0 (beta) ...

Is it possible, to import an OBJ too but without SUB-D?! Any possibility to set the strength of the build-in-SUBD? And for some OBJ Objects I dont want have SUBD ... e.g. if I import a pose from DesignDoll - nice tool for posing, but the poly-mesh-structure is very weird, lot of tris and so on - SUBD will not work well or much too long.

I try also the old MaxSmirnov Plugin _ImportOBJ it still works in 4.0 too, but in my eyes not very perfect, because if I import with _ImportOBJ the edges of each polygon are not welded, they are naked.
From: Michael Gibson
25 Feb 2019   [#257] In reply to [#256]
Hi Lordfox,

> Is it possible, to import an OBJ too but without SUB-D?!

Sorry, no not with any built in tools. An OBJ file without Sub-D is a faceted polygon mesh model and MoI is not designed to work with that kind of data for modeling. You would need to use a polygon mesh modeling program to import and work with that type of data, not MoI.


> Any possibility to set the strength of the build-in-SUBD?

Sorry, no not currently, it just uses the standard Catmull-Clark approach. At some point in the future I do want to add some edge weighting options but that would be unusual to do that directly in the OBJ importer.


> And for some OBJ Objects I dont want have SUBD ... e.g. if I import a pose from DesignDoll - nice tool
> for posing, but the poly-mesh-structure is very weird, lot of tris and so on - SUBD will not work well or
> much too long.

That model data is just not suitable for use in MoI in general - it's not what MoI is focused on working with.

- Michael
From: Lordfox
26 Feb 2019   [#258] In reply to [#257]
Hi, thanx ... but it runs good - the new SubD fuction - I have made some bevels in a polygon-modeling tool. Thank you so much. But one Polygon-Object I cant load with the SubD Tool. I dont know why, its very simple, no holes, only quads (754 Vertices) ... hmmm I dont know .... created in Silo 2.5.5.

http://www.mediafire.com/file/h04eys1g8e9mtc4/Rohr.obj/file => Rohr.OBJ thats the Missing Part

This OBJ I can also create in moi very easy and fast ... but please tell my, why I cant load.

Looks very well
https://i.imgur.com/gf9b82j.jpg

The guy I dont want import by SubD, but I can't import the thing between the seat and the ground. Im confused. Maybe a bug in the Beta Release? Or an issue with Silo?!
From: Frenchy Pilou (PILOU)
26 Feb 2019   [#259] In reply to [#258]
Ok That works with Wings 3D! ;)

(ps when you have such single object put it at the origine and not at the out of space! ;)

But your file has curious colors in some other free prog MeshLab, MeshMixer...

Here the OBJ...http://moiscript.weebly.com/uploads/3/9/3/8/3938813/rohr4.obj



And for this simple object you have better time to redraw it in Moi! ;)
Because 2 Millions polys at Maximum export is maybe not a cool deal! :).



And seems your model has some defaults...


From: bemfarmer
26 Feb 2019   [#260] In reply to [#258]
The two ends of the tubes have triangles, and T vertices.
By importObj script, and splitting the ends triangles, and saving, the tube will subD, but the ends are still polygons...
- Brian
From: Lordfox
26 Feb 2019   [#261]
@Pilou
I dont understand, why you see 2 Million Polys? But thanx, I will try out other pivot-settings.

@bemfarmer
thank you too - so I will take look to this too

I'm happy now .. it was my fail - did overwork the tube-ends. Now ist fine ...
https://i.imgur.com/ByHQ19d.jpg
From: Frenchy Pilou (PILOU)
26 Feb 2019   [#262] In reply to [#261]
When you import it by SUbD inside Moi
then export it as obj you have a choice to 67 000 (mini) to 2 000 000 polys (maxi) ;)
From: Michael Gibson
26 Feb 2019   [#263] In reply to [#258]
Hi Lordfox,

re:
> But one Polygon-Object I cant load with the SubD Tool. I dont know why, its very simple, no holes,
> only quads (754 Vertices) ... hmmm I dont know .... created in Silo 2.5.5.

It's because there are errors in the mesh structure, some degenerate faces and some faces with inconsistent normal directions.

The Rhino check command says:
quote:

This is a bad mesh.

Here is what is wrong with this mesh:
Mesh has 4 degenerate faces.

Important things to consider with this mesh:
Mesh has 128 faces with directions different from the mesh as a whole. Although this does not
necessarily mean that the mesh is bad, it can cause problems if you're doing mesh boolean operations with it.
Mesh has 4 pairs of faces that intersect each other. Although this does not
necessarily mean that the mesh is bad, it can cause problems if you're doing mesh boolean operations with it.


You may be able to fix it by using the "unify normals" tool in Silo:
https://nevercenter.com/silo3d/wiki/index.php?title=Unify_Normals

In the next v4 beta which should be released just later today, the sub-d conversion will skip over the problematic faces and give this result:



- Michael

Image Attachments:
lordfox_subd_import.jpg 


From: Lordfox
27 Feb 2019   [#264]
Thanx ;) - so its a problem of silo, wrong faced polygons in silo sometimes black and I see it and I fix it, but in somtimes my silo-object looks clean and the wrong polygon(s) are not "black" in silo.
I will set a wacom key, that makes all faces unify and after this a save.

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