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Hierarchical groups when saving the scene as obj?

The scene has a hierarchical structure from the root node to the child nodes.
But when I save the scene as obj, all hierarchies are lost, and all objects exist only at the first depth.
.
The OBJ format can create hierarchical groups.
How can I make obj hierarchical group with Aspose 3d?

@hayandoud

Please note that the grouping in .obj is not hierarchical groups. So it does not support hierarchy structure like FBX/GLTF. You can confirm it from here.

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Your answer is so good for me.
I have checked your link, then I have realized that the obj hierarchy group concept is my misunderstanding.
I have mistaken it because the concept of the hierarchical group is created using spaces in OBJ group names in Rhino 3D. But it’s the only a feature of Rhino 3D not a feature of OBJ format.
Anyway, I am Okay now. Thank you.

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