Select Vertex Group Islands [Blender Addon]

This is an addon for blender intended to help with the selection of vertex group islands (collections of vertices that are connected within a vertex group). This is useful for things like quickly grabbing small vertex islands that were created accidentally from weight painting, so they can be deleted.

Functions:

• Selects the vertex group island containing the active selected vertex (the one that glows a different color)
• Selects a vertex group island associated with a number (it numbers them starting at zero arbitrarily for purposes of selecting one)
• Can have the above functions acknowledge or ignore vertices that have 0 weight in the vertex group

Notes:

• Buttons are added to the vertex dropdown menu for a mesh in edit mode
• Likely will want to normalize vertex groups after edits if messing with weight painting vertex groups
• Blender may appear to freeze for short moments when the button is pressed for objects with large numbers of vertices and/or vertex groups
• This was made for Blender 4.2, so may function weirdly if used on a different version, but will likely work on future versions.
• Tested for most likely error cases, but can't guarantee I caught all of the bugs

Install Guide:

1. Download the file
2. Go to Edit->Preferences->Add-ons then press the "Install from disk" button hidden in the arrow drop down menu in the top right
3. Select the python file downloaded earlier
4. Hit the install button (should be called "Select Vertex Group Islands" once installed)