Nalates has an in-depth tutorial for creating customized hand and toenails for Second Life avatars -- so in-depth, she gets into the 13 year+ history of SL avatars, a timeline of retrofits and workarounds, as the user community created solutions (and additional complexity) to Linden Lab's avatar forms. For instance:
The basic idea of changing your avatar to fit clothes didn’t go over well and limited sales of Standard Size products. To get past the limited appeal designers created what they called liquid mesh by figuring out how to weight mesh items to hidden parts of the avatar skeleton that somewhat worked with avatar shape settings. The popularity of liquid mesh led the Lab to develop Fitted Mesh, a more complete liquid mesh. The Lab added some bones and made other existing bones accessible for weighting and animation and did some slider work. The modifications were completed in early 2014. This lead to what we have now (2017): Fitted Mesh, that works with most of the shape sliders.
And so on. I'm continually fascinating by how Second Life the company both collaborates and conflicts with Second Life the community.
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