The code formatting was inconsistent in a lot of places, and I cleaned that up with the black formatter. There is now a math.isclose method that handles the hand-crafted comparison of vertex positions, too.

I also modernized the code a bit and fixed some SyntaxWarnings that are shown by Python 3.8 - for example, None is usually the only constant that should be compared against with identity and not equality. If it's not possible to find a simple linear ordering of selected vertices, the addon exits with an error: Vertices can overlap in both U and V coordinates this is handled properly:ĭisconnected sets of vertices are aligned independently: This functionality uses two BFS graph traversals to find a linear ordering of vertices:

On Ubuntu, I had to install the python3-numpy system package, which is now described in the README ( ebdad46). The new code in this PR requires NumPy and Python 3.7 or newer - Blender 2.82 on Windows already includes both, so this version of the addon can be installed and used as-is. (I consider myself very fluent in Python, and I've written a lot of Python code in the last decade or so, but this is my first exposure to the Blender API.) I didn't see a way to access the BMLoop object from a BMLoopUV, so I had to build entirely separate data structures to map vertex coordinates to BMLoops (see 0c9f0c5). As far as I can tell, the existing code paths use BMLoopUV objects to move vertices in UV space, but I needed to access the parent BMLoop objects to walk the edges between vertices. First, thanks for the addon! I've found it quite useful in manipulating UV unwrapping.Īfter using this addon a few times, I realized that what I really wanted to do isn't implemented: aligning vertices to the U or V axis while preserving the distance between them in UV space.

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