Creating new animations for a Spine skeleton directly inside Unity is not straightforward. While you can write code to generate a Spine animation, it is generally more efficient to use Spine's dedicated tools for animation. Unity's native tools can be used for non-Spine animations, but the user experience may not be as smooth as using Spine itself.

For evaluating Spine animations in Unity, you can download the spine-unity runtime, which includes various examples and documentation to help you get started:

• spine-unity Runtime Documentation
• Spine Unity Download

Additionally, you can look at the example Unity project provided in the spine-unity runtime, such as the Spineboy.cs file, which can guide you in the right direction for integrating Spine animations into your Unity project:

• Spineboy.cs Example

For more advanced needs, you might consider using Unity's Mecanim system with Spine animations, although this requires some setup:

• Spine Examples/Other Examples/StateMachine SkeletonAnimation

If you need to bake Spine animations into Unity prefabs, the spine-unity runtime also offers skeleton baking functionality:

• spine-unity Runtime Documentation: Skeleton Baking

For more detailed information and examples, you can refer to the spine-unity runtime documentation and the provided example projects.

danialcaraz The tags available for layers in PSD are described in the following page of the Spine User Guide: https://esotericsoftware.com/spine-import-psd#Tags