Stuck Vertices in Shape Keys

[Enverex]

I've been testing some model imports and have noticed that some of the shape keys appear to have broken vertices. Basically the key seems to work fine, with the exception of a random amount of vertices which don't move with the shape key. Here's an example:

https://cdn.discordapp.com/attachments/629302253768933376/638764306187550730/unknown.png

Here you can see 3 vertices that just don't seem to move when the shape key is enabled. Is this a bug with BST or is this caused by something else?

[Zappy]

If two (or more) vertices are at the exact same coordinates, regardless of whether you use DMX flexes or VTA flexes, StudioMDL will only apply flexes onto the first vertex in that location.

So to part lips, the base model must have the lips' vertices at least slightly offset from each other.


It makes "sense" for VTA flexes (they match to the nearest vertex; they're separate from the model's mesh, so they can't say "this vertex moves that way", only "the vertex closest to this point moves that way"), but it's stupid for DMX flexes.

In any case, this is not a bug with the Blender Source Tools plug-in, so you have to live with it.