Blender Link does not preserve original topology / UV mapping correctly

Bug Report
1

Hi,

I’ve encountered an issue with the Blender Link feature.

When I send a mesh from Blender to Nomad using Blender Link:

- The UV data still appears to exist in Nomad.

- However, when I create Face Groups from the UV islands, the resulting Face Groups are completely scrambled.

- The vertex order also seems to change, so the mesh can no longer be used as a morph target.

I compared this with the normal import/export workflow.

When importing the same mesh normally and enabling “Use Original Topology”, everything works correctly:

- UV → Face Groups works correctly.

- Vertex order is preserved.

- The edited mesh can be used as a morph target.

So it seems that Blender Link may not be preserving the original mesh topology/index order in the same way as the “Use Original Topology” option during normal import.

Would it be possible for Blender Link to preserve the original topology/vertex order, or to add an option equivalent to “Use Original Topology”?

Thank you!

2

Blender doesn’t support indexed UVs that’s why it’s “scrambled”.
There is nothing to “preserve” there, on the contrary, I should rather merge the identical UVs.

For the morph target, the App Link already supports layer (Nomad) and shape keys (blender).

3

By “morph target”, I don’t mean Blender Shape Keys.

I’m using the mesh as a morph target for Character Creator 5 (CC5), which requires the exact original vertex order to be preserved.

With normal import/export, if I enable “Use Original Topology” in Nomad, the edited mesh works correctly as a CC5 morph target.

However, if I use Blender Link instead, CC5 rejects the resulting mesh as a morph target.

So I suspect the vertex order/indexing may be changing somewhere during the Blender Link transfer.