The full version of this that AnemoneLabSNC was working on probably honors app scales. I'll let him reply on the status of that.
Hi Jon, scaling is now ok for me. I used external texture packer to scale atlas for each engine scale. Animation is now same in every engine scale. After that SkeletonData must be scaled during the import using scale property.
Where I need your help is the centering animation on actor. Trivial task but nothing work ;)
In the attachment you can find commented spine behavior and loading the right atlas for scaled skeleton data... If you need another scaled atlases from your spine animation let me know.
I think that must be something about localtoglobal conversion+scale. Trivial but hard to say.
Off topic: I have the same issue when I add normal bitmap to actor and center this bitmap on actors center. Works only in 1x engine scale.
Thank you for your time and have a nice day