SpriteKit supports custom Metal rendering pipeline https://developer.apple.com/documentation/spritekit/skrenderer
So it is possible to write anything you want including meshes, shaders, post filters and so on. But in fact you have to write all rendering from scratch (including
existing sprites)
But I'am too lazy, and too stupid - ha ha ...
Anyway, Spine ESS features enough for my needs..
If anyone cares, I recently updated Swift version of Spine ESS runtime. This runtime is written on top of SpriteKit 2D engine (native framework from Apple). This runtime supports basically all Apple platforms (iOS, macOS, tvOS and watchOS).
If you crazy enough to make your game project native on a SpriteKit - welcome aboard!
Source code and documentation you can find here:
https://github.com/maxgribov/Spine
At the moment I am updating my runtime for iOS/macOS and found that the documentation on the JSON format is outdated.
For example, what do I see in JSON when exporting from Spinne 4.1.17 ESS regarding curves:
It radically different from what I see in the documentation:
To access the JSON documentation, I use this link:
http://esotericsoftware.com/spine-json-format
Perhaps there is some other link to the updated documentation?
Also unable to locate spine.log file.
Here is sample project: https://github.com/maxgribov/SpineSampleProject
Hey mate!
Here is sample project: https://github.com/maxgribov/SpineSampleProject
I'm sorry I took so long. I just had to lie down in the hospital where I had surgery. Nothing life-threatening, but nevertheless was not up to the Spine. 
Max
ok, I'll create sample project this week.
Hey!
Check out wiki: https://github.com/maxgribov/Spine/wiki/Assets
Hey!
I noticed that you recently were looking for a Swift/SpriteKit runtime library. Check my library out: https://github.com/maxgribov/Spine.
Maybe that's what you're looking for?
Hi, everyone.
I want to share with you the Swift library which allows you to upload characters and their animations from Spine in SpriteKit:
https://github.com/maxgribov/Spine
The library is available for all Apple platforms: iOS, macOS, tvOS and watchOS. For now implemented all the basic functionality of Spine-ESS: animation of bones, attachments, skins, converting bounding boxes into physical bodies and some other features.
Library fully written from scratch in Swift 4.0 and does not use any official Spine runtime. All work is built entirely on SpriteKit and used only native Apple technologies.
Pro Spine features like meshes, ik, constants - are not implemented at the moment, mainly because I don't have the Spine-Pro version. It's a little expensive for me so far...
In any case, the possibilities for such implementation exist and perhaps these features will be implemented by me in the future.
I hope the library will be someone useful, I'd love to hear your feedback and comments...
