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So I was experimenting with seeing how far I could go making a functionally rigged model but hand make only half of it, letting the computer generate the other half completely automatically. Mirror mod seemed like the dream tool for this task.

Thing is... now I am at a stage where I need to mass-copy and flip all vertex groups from one side to the other. I know I can just select vertex groups, copy and mirror, one by one, and then rename them to reflect their side, all at once with no problem at all. But what I wanna do is have a mirror image or "virtual" vertex groups, for the virtual other side of the model. Copied, flipped and renamed automatically, all at once, in a non-destructive or virtual way (don't know if it's the best way to put it in words)

As far as I know it should be as easy as toggling the "vertex groups" button in the "Options"section of the Mirror mod. But this option doesn't seem to do anything even when testing the feature on other or new files. How to make it work?

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Was about to post this question I had stored as a draft since yesterday and just now I found out the answer.

The mirror modifier doesn't create vertex groups, it only flips them from left to right to the according ones of the other side. To be able to mirror the vertex groups your mesh should already have the groups, named accordingly (Whatevs.L and Whatevs.R for example, but acutally any naming method you used to separate sides). The v. groups do not need to have any vertex assigned to them, they can be tottaly empty. All they need is to exist and be named accordingly.

This is all you need to make a model that is "half-virtual" as long as everything is perfectly symetrical, including the skeleton. Saves a huge ammount of time

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