Babylon Exporter and Vertex Groups

[adam]

Is there a way to export and then access vertex groups?

 

I'm trying to make my character's eye blink and need to be able to easily access the vertices of the eyelid.

 

Edit:  Title should have been Blender Exporter and Vertex Groups.

[JCPalmer]

Using a .babylon file, no, at least not directly.  Neither FileLoader, nor BJS,  support Vertex Groups, so there is no path to export them.

 

That said, BJS does support Submeshes.  If you assign the vertices of the Vertex Group to a separate material on the mesh, then a multi-material will get exported, and a submesh containing the vertex group will be created.  Ease of access wise, you are on your own, but you have got your data across.

[adam]

I think I can work with that.  Thanks

[adam]

I'm not seeing any change to my model after updating vertex positions.  I saw that the vertexbuffer has updatable = false, so I set _updatable = false, but that didn't work.  What is the correct way to make vertex positions updatable?

[adam]

mesh.updateMeshPositions isn't working for me either.  I'm probably going to need to make a PG. 

[adam]

It turns out that some vertices are moving with mesh.updateMeshPositions.  They just aren't the correct vertices.  I'm using the indexStart of the submesh for the first index in the positions array and indexStart + verticesCount for the last index; 

[adam]

I got the vertices to move, but unfortunately the faces don't stay connected to the rest of the mesh.

[adam]

I finally figured it out.  After getting the values for each of the vertices from the submesh, I need to search the entire vertices array to find every reference to those vertices.  I didn't realize that one vertex in Blender can be inserted into that vertices array multiple times.