question

the node chair1pos likely doesn't exists inside DA62_LOD00.gltf

The SDK example is too confusing.

Here is a minimal example:

<ModelInfo guid="{daba6ada-f090-4a4c-b0f0-f91f30932b4b}" version="1.1">
<LODS>
    <LOD ModelFile="parent_LOD0.gltf" minSize="30">
      <AttachModel id="child_model"/>
    </LOD>
    <LOD ModelFile="parent_LOD1.gltf" minSize="10">
      <AttachModel id="child_model"/>
    </LOD>
    <LOD ModelFile="parent_LOD2.gltf" minSize="5">
      <AttachModel id="child_model"/>
    </LOD>
    <LOD ModelFile="parent_LOD3.gltf" minSize="3"/>
</LODS>
  <ModelAttachments>
    <ModelAttachment id="child_model">
      <AttachToNode>attachment_point</AttachToNode>
      <Model>..\model.child\model.xml</Model>
    </ModelAttachment>
  </ModelAttachments>
</ModelInfo>

This example assumes that you have two model folders model.parent and model.child with such structure:

[D] SimObject root
├─ [D] model.parent
│ ├─ [F] model.xml ← The file above
│ ├─ [F] parent_LOD0.gltf
│ ├─ [F] parent_LOD1.gltf
│ ├─ [F] parent_LOD2.gltf
│ └─ [F] parent_LOD3.gltf
├─ [D] model.child
│ ├─ [F] model.xml ← The referenced child model
│ └─ [F] (glTF files ...)
└─ [D] texture ← Both child and parent will use textures from parent's texture folder

The parent model has four LOD sizes and each separate model contains node named attachment_point where the child model will be attached. Keep in mind that sizes below 5 will not show attachments.

You can of course include models from the same folder too, they don't have to be in separate folders. Child object can be any standard model and include its own LODs, which will be calculated separately.

I am still getting a red warning message "model attachment 0" on compile. Don't know what I can be doing wrong. In 3ds max I named the node 'attachment_point"

here is what I get

I have tried everything, and its impossible. This is a simobject

Difficult to help you without looking at your xml file too.

In your first post, you showed an xml calling the default DA62 models so, the reason why you got the error about chair1pos, was there is no chair1pos node in the default DA 62 gltfs.

Now, it seems you are doing something derived from the default A320 but, if you are still including the original .GLTFs, to attach something on it, you must use a node that exists there.

Thanks Umberto, actually is my own gtlf, here is a sample of the xml

<ModelInfo>
<LODS>
<!-- Highest LOD -->
<!-- minimum display size in % (should be bounding sphere vertical screen size, sphere will often be slightly larger than you expect) -->
<!-- default minSize is 0 -->
<LOD minSize="150" ModelFile="A321_NEO_LOD00.gltf"/>
<AttachModel id="child_model"/>
<LOD minSize="80" ModelFile="A321_NEO_LOD01.gltf"/>
<AttachModel id="child_model"/>
<LOD minSize="50" ModelFile="A321_NEO_LOD02.gltf"/>
<AttachModel id="child_model"/>
<LOD minSize="15" ModelFile="A321_NEO_LOD03.gltf"/>
<AttachModel id="child_model"/>
</LODS>
<ModelAttachments>
<ModelAttachment id="child_model">
<AttachToNode>attachment_point</AttachToNode>
<Model>model.xml</Model>
</ModelAttachment>
</ModelAttachments>


I put the attached (child) model in the same folder where I have this parent GTLF

I did a node called 'attachment_point' in the gtlf

You mean you created your own version of all the A321_NEO GLTFs, which have been modified by adding the attachment_point node ? That would be the only way for it to work.

Hi Umberto, yes on my own GLTF's. I just tried doing it with the default DA62, and get the same error.

I had thought the issue may be on my node name. I don't know.

Thanks so much Umberto, I think that was the mistake, now I am not getting that error message. Thank you!