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This tutorial shows you how to export animation data from Spine project for using in Unity.
Example project includes 2 skeletons (with one or more animations). As a result after export you get 4 files:
2x JSON files - 1 skeleton == 1 JSON file - JSON data describes skeleton and all included animations frame by frame
1x PNG file - texture atlas includes all graphics assets used in spine project (for all skeletons)
1x TXT file - describes positions, rotations etc. of all graphics assets includes in texture atlas