Hello!
Let's see, if the image has the same size, I'd recommend duplicating the original mesh first, then modifying it.
If the new image has a different size, then it makes sense to copy and paste the vertices.
Please note the order in which you select the vertices when you copy, and the order in which you paste them matters (they will be pasted in the same order)
A thing that could be causing problems is if your axes are set to Local
instead of World
, as if the two images are parented to two different bones, this might ruin the vertices position in Local
, trying to follow the bone orientation instead.
Another thing that shouldn't be overlooked is that the number of vertices that you copy, and the one that you paste should be the same.
You could also try to copy and paste the vertices in small groups to see how it turns out.รน
Here is the related User guide entry: Tools - Spine User Guide: Transform copy