Automatically merge vertices that are too close together in mesh tracing

[misaki-eymard]

Currently, it is possible that the mesh tracing creates some vertices very close together, depending on the settings, and that you do not notice this fact until you zoom in quite a bit. For example, if you turn the gun attachment into a mesh attachment and run a trace with the following settings, some very close vertices may be created:

• Detail: 50
• Concavity: 100
• Refinement: 50
  

If you zoom in, you can see that the vertices are very close to each other like this:

Such vertices that are too close together sometimes interfere with the automatic calculation of weights. It would be desirable to automatically merge vertices within a certain range during the tracing calculation.

Related forum post:
https://esotericsoftware.com/forum/d/27986-%E5%85%B3%E4%BA%8E%E7%BD%91%E6%A0%BC%E7%BB%98%E5%88%B6%E6%9C%89%E5%8F%AF%E8%83%BD%E5%BC%95%E8%B5%B7%E6%97%A0%E6%B3%95%E8%AE%A1%E7%AE%97%E6%9D%83%E9%87%8D%E7%9A%84%E9%97%AE%E9%A2%98

[NathanSweet]

We already remove vertices close to each other (and very narrow spikes). I tried many times but wasn't able to get 2 vertices close like in your screenshot. Is it very rare?

[misaki-eymard]

Is it very rare?

Hmm, when I tried on my end, I was able to reproduce this condition in one try, so I thought it could be easily reproduced. However, I just tried again and could not reproduce the issue. I wish I could find a way to reproduce it reliably.

[misaki-eymard]

I was able to create a Spine project that more easily reproduces this issue than Spineboy, so I am attaching it here:
Automatically merge vertices that are too close together in mesh tracing.zip

Try tracing with the following settings:

• Detail: 21
• Concavity: 28
• Refinement: 80

This project and setup should be reproducible about 80% of the time.

It would be nice if future versions could be improved so that the resulting vertices, like the red circled ones below, do not remain:

[Mizuiro-89]

+1 this happens to me from time to time and is very annoying