StaticMeshImport in Chaos Panel Cloth gives "Failed to generate skinning data, found coincident vertices in triangle" but it must be a bug

Development Asset Creation
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1

Hi,

I have been developing some clothing assets for Metahumans and thought I would try the new Panel Cloth approach.
For all assets I merged inside the editor (using the Merge Tool or Merge in Modeling mode) I got the above mentioned error. First I thought I had coincident vertices so I went to Blender and merged by distance but no merging took place. Because there were no coincident vertices. The mesh data the panel cloth looks at “makes up” some non-existing triangles.

In this post I describe a concrete example with a screenshot and show that the supposed triangle with coicident vertices did not even exist. Failed to generate clothing sim mesh due to degenerate triangle - #9 by BreakMaker

Must be a bug / issue which occured when I used the merging tools to merge the meshes and thus some vertices got new vertex positions assigned.

2

I’m having the same issue and can’t find a solution.
After merging by distance (default 0.0001 m) in Blender, the error doesn’t go away, but there’s less coincident vertices according to the UE log.
Funnily enough, if I then merge by distance 0.0002 m in Blender, I’m getting more coincident vertices in UE… please someone explain what’s going on.

3

How did you create your mesh? Did you merge at some point? Merge materials or geometry?

4

Yes, I merged materials and that caused the issue.
If I leave it with the five materials I get from Marvelous Designer, it works.
If I merge them to one material, which I need for Substance Painter, I get this error.