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11-20
From: Michael Gibson
Hi Yanus3D,
re:
> - A massive number of LW layers (if the object is heavy, it can exceed 50 layers) is problematic.
> I suggest forcing the exporter to include only ONE LAYER (the first in the list in LW).
I'm not sure if I'm understanding this one yet because of the different terminology in each app.
MOI does not have anything called layers.
Rhino has something called Layers, when you open a .3dm file from Rhino into MOI, the layer list in Rhino will become the styles list in MOI.
When you export from MOI into a polygon mesh format for rendering, the styles list in MOI will become the materials list in the rendering program.
In LWO format there is a thing called Layers ("LAYR" chunk) where geometry like vertices and faces is stored.
In Rhino and MOI the thing that contains geometry is called an "Object" which can have an object name.
When you export from MOI to LWO, the object list and object names in MOI will become a list of 'LAYR' chunks in the .lwo file.
There is an option in the MOI export settings that controls how objects in MOI with the same object name are written. That's under Options > Import/Export > "Combine same named objects" checkbox (at the top, it is used by multiple formats).
If "Combine same named objects" is set, then every object in MOI that has the same name (other than a blank name) will combine together into one 'LAYR' chunk in the LWO file.
So if you want only one 'LAYR' chunk in the LWO file, you should be able to do that now by setting the same name on all objects in MOI before doing the export and also have "Combine same named objects" enabled.
re:
> - Merge points if possible. The exported LWO model from MoI has exploded polygons, which is problematic. (not sure this possible)
To get a watertight mesh the edge in the CAD object must be a joined edge shared by 2 faces. Then also the "Weld vertices along edges" controls whether vertices for each face will be separate but stacked on top of each other or whether they will reference the same vertex.
- Michael
From: Yanus3D (JANUSZBIELA)
I upload for you model to show "issue"
After opening it in Lightwave I see multiple layers (this model is light but you can imagine something bigger...)
surfaces are correct (guys from Rhino use one layer with multiple surfaces names - thats why I get correct surfaces in LW, otherwise , in traditional way I get one surface name)
Topology in Rhino with layers/names is different than in Lightwave. This is not issue and we can deal wit it. Issue is multilayer construction after export from Moi.
In attachment object R5 for test and screenshot from LW.
Attachments:
whirlpool 1.3dm
Image Attachments:
Screenshot 2026-05-20 095409.png
From: Michael Gibson
Hi Yanus3D, please try the attached .lwo , does it have the LightWave layers how you want?
- Michael
Attachments:
whirlpool 2_lwo.zip
From: Yanus3D (JANUSZBIELA)
Yes!
That`s correct export
One layer only.
Image Attachments:
Screenshot 2026-05-20 114330.png
From: Michael Gibson
Hi Yanus3D,
re:
> Yes!
> That`s correct export
> One layer only.
Great! To get that result, make sure "Combine same named objects" is turned on here under Options dialog > Import/Export :
Then set the objects you want combined to have the same object name before exporting.
To do that, use Ctrl+A to select all, then click on the object name here and set to any name other than blank:
If you then generate your .lwo file you should get the same one layer result.
- Michael
Image Attachments:
CombineSameNamedObjects.jpg
From: Yanus3D (JANUSZBIELA)
Yes, that`s works!
So I was thinking (I hate extra clicks in pipeline) is possible to do automatically?
Simple button in LW Exporter for it.....
From: Michael Gibson
Hi Yanus3D,
re:
> So I was thinking (I hate extra clicks in pipeline) is possible to do automatically?
Yes, you can set up a shortcut key that will do those steps automatically.
To do that go to Options > Shortcut keys and add a new one. For the Command part of the shortcut key put in this:
script:
moi.geometryDatabase.getObjects().setProperty( 'name', 'Layer' );
moi.geometryDatabase.saveAs( 'filetype=lwo' );
- Michael
From: Yanus3D (JANUSZBIELA)
Thank you!
But I am thinking about a fixed solution, such as adding a checkbox in the export menu. Could you add that?
There are too many procedures involved in exporting and importing, and I want to avoid unnecessary clicks and shortcuts.
I ask this because I understand when someone does it casually, but in our case, we have multiple projects running simultaneously, a huge data exchange between departments, and every extra click counts.
From: Michael Gibson
Hi Yanus3D,
> I ask this because I understand when someone does it casually, but in our
> case, we have multiple projects running simultaneously, a huge data exchange
> between departments, and every extra click counts.
You only need to set up the shortcut one time, after that using the shortcut is just one key instead of 2 clicks.
Actually the shortcut saves even more clicks than that because it sets the file type to .lwo automatically as well.
- Michael
From: Yanus3D (JANUSZBIELA)
O yes...now works perfect :)
So I wait for next update with fixed Pivot.
Thanks again!
Can you make a list what I can put in script for Lightwave format?
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