Hello!
In this example, there is an imported mesh (consisting of 7 meshes) and two meshes created by MeshBuilder.
If you try to MergeMeshes all 9 meshes, null will be returned. This is not correct behavior.
This is not a bug but a limitation of the process.
You can actually see in the console log:
Basically the face orientation being different are preventing the process to be possible.
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Understood. Thanks, I missed that
no problem, it is not always the most obvious. you could try in right handed mode as in this case I belive both loaded gltf and created elements will have the same handedness.
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