ExportHumanoidRig.cs

namespace ExportHumanoidRig
{
    using System.Collections.Generic;
    using System.Linq;
    using UnityEditor;
    using UnityEngine;

    [System.Serializable]
    public class ExportHumanoidRigWindow : EditorWindow
    {
        private GameObject obj = null;

        [MenuItem("GameObject/ExportHumanoidRig", false, 20)]
        public static void ShowWindow()
        {
            EditorWindow.GetWindow(typeof(ExportHumanoidRigWindow));
        }

        private string ConvertAvatarToJSON()
        {
            var animator = obj.GetComponent<Animator>();
            var dictionary = CreateEnumDictionary<HumanBodyBones>();
            var output = "{";
            foreach (var kvp in dictionary)
            {
                var bone = kvp.Value;
                if (bone == HumanBodyBones.LastBone)
                {
                    continue;
                }
                var transform = animator.GetBoneTransform(kvp.Value);
                output += "\"" + kvp.Key + "\":" + (transform ? "\"" + transform.name + "\"" : "null") + ",";
            }
            output = output.TrimEnd(',');
            output += "}";
            return output;
        }

        static public Dictionary<string, EnumType> CreateEnumDictionary<EnumType>()
        {
            return System.Enum.GetValues(typeof(EnumType)).Cast<EnumType>().ToDictionary(t => t.ToString(), t => t);
        }

        private void OnGUI()
        {
            obj = (GameObject)EditorGUILayout.ObjectField("GameObject", obj, typeof(GameObject), true);
            if (GUILayout.Button("Export"))
            {
                var json = ConvertAvatarToJSON();
                var path = Application.dataPath + "/" + obj.name + ".json";
                System.IO.File.WriteAllText(path, json);
            }
        }
    }
}