Split & Inflate Marked edges

What is that script for

When baking in Marmoset Toolbag, the "Smooth Cage" setting always merges cage vertices along sharp edges (or not splits it?).

This can make your bake results to be not good as expected on some parts like sharp weapon edges,  geometry borders, or backfaces. Then you go and skew, but it’s could be better with Smooth Cage off, but Smooth Cage works better for bakes on most parts….

This addon helps fix that. Mark the edges in Blender that you want to stay sharp and split for your bake in Marmoset (with Smooth Cage ON). It works with a separate Modifier that automatically (and Non-manifold!) splits those edges when you export your mesh for baking.

It also colors the edges you marked in the viewport so you can see them easily.

How to Use (Quick Guide)

1. Install: Install the addon .zip file (Edit > Preferences > Add-ons).
2. Mark/Unmark:

• Go into Edit Mode on your mesh (Tab).
• Switch to Edge Select (2 key).
• Select Edges you want to be kept split in Marmoset, even if 'Smooth Caged' is on.
• In the Sidebar (N key) -> Root Bone Tools tab -> Marmoset Smooth Cage fixer panel, click "Mark Selected" or "Unmark Selected".
• OR you could use Ctrl+E (Edge) panel menu, and in the end of it, you will see two buttons "Mark Selected" and "Unmark Selected".

3. Visualize:

• Use the "Show Marked edges" button to show/hide the colored overlay in Edit Mode.
• Use the Color Picker in the panel to change how marked edges look. (optional)

4. Export for Baking:

• Make sure "Apply Modifiers" is checked when you export (e.g., OBJ, FBX).

5. Additional usage:

• By unchecking "Edge Split Marked Edges" you could only inflate vertexes that connected to 2 or more Marked edges
• By unchecking "Inflate Marked Edges" you could only split Marked edges, basically same thing that Edge Split Modifier does, but with custom Marked edges, which are separate from usual Hard edges, allowing you to be more flexible with them.  

So, the goal is to export objects with splitted edges, so Marmoset’s Smooth Cage not merging those edges.