Hierarchy Visualizer

BoneDrawer.cs

#if UNITY_EDITOR
namespace pointcache.utility
{
    using UnityEngine;
    using System;
    using System.Collections.Generic;
    using UnityEditor;
    public class BoneDrawer : MonoBehaviour
    {
        const float rad = 0.05f;
        private void OnDrawGizmos()
        {
            if (transform.parent != null)
            {
                Gizmos.DrawLine(transform.position, transform.parent.position);
                Gizmos.DrawSphere(transform.position, rad);
            }
        }

        private void OnDrawGizmosSelected()
        {
            if (transform.parent != null)
            {
                if (Selection.activeGameObject == gameObject)
                {
                    Handles.Label(transform.position, "-----------  " + name);
                    Gizmos.color = Color.yellow;
                    Gizmos.DrawLine(transform.position, transform.parent.position);
                    Gizmos.DrawWireSphere(transform.position, rad + 0.01f);
                    Gizmos.DrawWireSphere(transform.parent.position, rad + 0.01f);
                }
                else
                {
                    Gizmos.color = Color.green;
                    Gizmos.DrawWireSphere(transform.position, rad + 0.01f);
                    Gizmos.DrawLine(transform.position, transform.parent.position);
                }
            }
        }
    }
}
#endif

HierarchyVisualizer.cs

//add this to your root object enable disable to control

#if UNITY_EDITOR
namespace pointcache.utility
{
    using UnityEngine;
    using System;
    using System.Collections.Generic;
    using UnityEditor;
    [ExecuteInEditMode]
    public class HierarchyVisualizer : MonoBehaviour
    {
        public bool hideMesh = true;
        private void OnEnable()
        {
            AddDrawers_Recursive(transform);
            var mr = GetComponent<SkinnedMeshRenderer>();
            if (!mr)
            {
                mr = GetComponentInChildren<SkinnedMeshRenderer>();
            }
            mr.enabled = !hideMesh;
        }
        private void OnDisable()
        {
            RemoveDrawers_Recursive(transform);
            var mr = GetComponent<SkinnedMeshRenderer>();
            if (!mr)
            {
                mr = GetComponentInChildren<SkinnedMeshRenderer>();
            }
            mr.enabled = true;
        }
        void AddDrawers_Recursive(Transform tr)
        {
            if (tr.childCount > 0)
            {
                foreach (Transform t in tr)
                {
                    if (!t.gameObject.GetComponent<BoneDrawer>())
                        t.gameObject.AddComponent<BoneDrawer>();
                    AddDrawers_Recursive(t);
                }
            }
        }
        void RemoveDrawers_Recursive(Transform tr)
        {
            if (tr.childCount > 0)
            {
                foreach (Transform t in tr)
                {
                    var drawer = t.gameObject.GetComponent<BoneDrawer>();
                    DestroyImmediate(drawer);
                    RemoveDrawers_Recursive(t);
                }
            }
        }
    }
}
#endif