unity 2019.1.5 uvs breaking at build time.

Experiencing an issue where it appears UVs are being merged or move after running builds.

Everything looks OK in editor, but after running a build there are a number of texture stretching issues. Looks like UVs at some tolerance are being merged together or moved in space. Also appears to really only be an issue on the base UV0 map.

Is there some kind of optimization setting i'm missing? Or some kind of limit to size/ distance for UVs?

It is a large somewhat complex piece of geometry (lots of materials), but the fact it only breaks at build time makes me think im missing something simple in regards to Unity settings, and not an art asset root cause.

We have produced a number of projects with previous versions of Unity without encountering this issue. Any ideas would be appreciated

 

Try checking your player settings, under other settings > optimization > vertex compression

 

It's set to mixed, and that tex coord 0 is checked... will look deeper into this thank you.

 

Appears to have resolved the issue. Appreciate it @bgolus