The Extra Mesh Editor automates tasks like the Removing from Manifolds (Edges and Vertices), the Generation from Convex Hulls, and painting the Curvature as Vertex Colors.

This Add-on uses pymeshlab for some functions. You can install this package/library through PyPip.

This Add-on contains PyPip. This separate Add-on allows you to install Python packages/libraries from the Blender UI for the Python Interpreter of Blender. (File: PyPip_1_0_0.zip in the Download Area)

Links:

Discord: https://discord.gg/D2AZRcZMxt

Check out my other products: https://blendermarket.com/creators/ebtrr

Sketchfab: https://sketchfab.com/ebtrr

If you have any questions feel free to contact me. 

For feature requests and Bug reports, you can use the Discords Channels or the Blender Market Contact Formular.

Main Functions:

These functions can be executed for single objects or collections (Selection Type).

The Target Collection should not be a Sub-Collection of the Selected Collection.

Generating a Convex Hull:

Removing Non-Manifold Vertices:

Removing Non-Manifold Edges (Remove Face or Split Edges):

Both processes can result in a separation of the mesh into Submeshes, which both are Manifold Meshes but not united.

Close Holes for 2-Manifold Meshes:

Original:

Result:

After executing Basic Quad to Tris:

Discrete Curvature (Two Different Methods to Calculate the Curvature):

Principal Curvature (Two Different Methods to Calculate the Curvature):

Sub-Functions:

• Transforming Tris to Quad-Faces for Objects and Collections
• Merge by Distance for Objects and Collections
  

Meshlab uses triangulate/Tris-Meshes. If you have a Quadmesh, you can use the Basic Quad to Tris Function by Selecting the new Object.

You can get back N-Gons through the execution of the Basic Quad to Tris Function and then add a Dissolve Decimate Modifier.

I originally created the Add-on mainly for my Tris-Meshes and some of my Quad-Mesh Data.

If you stop Blender while a function is evaluating an object, the process can leave temporary files in your directory, which you can delete later on.

These are typically cleaned up.

The Meshes usually need a UV except for Repairing Non-Manifolds and Convex Hull processes/functions.

The error message is then:

"The process could not run:
Failed to apply filter:  'compute_scalar_by_discrete_curvature_per_vertex. Current mesh does not have Any Faces."

Advice: Smart UV Project with an Island Margin is enough if your mesh has no UVs.

Not connected UV Faces must have a margin. Two unconnected Points should not intersect in UV Map. (If you have a Clean UV Map

My recommendation is that you think if you really need to, for example, clean Non-Manifold Data or want to use the Discrete Curvature.

Updates:

1.0.1 (04.09.2022): Cleaned Up Source Code. Better import of Python Packages.

Future:

Users of the Add-on can request new functions, which should be exposed from Meshlab, or Actions in the Edit Mode, which should be automated.