VRMPoseImporter.cs

/*
 * This code (VRMPoseImporter.cs) is licensed under CC0.
 * http://creativecommons.org/publicdomain/zero/1.0/deed.ja
 */

using UnityEngine;
using System;
using System.IO;
using System.Reflection;

public class VRMPoseImporter : MonoBehaviour
{

    public string filePath;
    public void loadJson(string path)
    {
        string json = File.ReadAllText(path);
        PoseItem poseItem = JsonUtility.FromJson<PoseItem>(json);
        applyPose(poseItem);
    }

    [ContextMenu("load json")]
    public void reload()
    {
        string json = File.ReadAllText(filePath);
        PoseItem poseItem = JsonUtility.FromJson<PoseItem>(json);
        applyPose(poseItem);
    }


    private Animator humanoidAnimator;
    private void applyPose(PoseItem poseItem)
    {
        humanoidAnimator = GetComponent<Animator>();
        Type type = poseItem.GetType();

        foreach (FieldInfo field in type.GetFields())
        {
            BoneItem boneItem = (BoneItem)field.GetValue(poseItem);
            if (boneItem.rotation != null)
            {
                applyBoneRotaiton(field.Name, boneItem.rotation);
            }
        }
    }

    private void applyBoneRotaiton(string name, float[] rotation)
    {
        if (humanoidAnimator != null)
        {
            string boneName = Char.ToUpper(name[0]) + name.Substring(1);
            HumanBodyBones bone = (HumanBodyBones)Enum.Parse(typeof(HumanBodyBones), boneName);
            var boneTrans = humanoidAnimator.GetBoneTransform(bone);
            if (boneTrans != null)
            {

                boneTrans.localRotation = new Quaternion(-rotation[0], -rotation[1], rotation[2], rotation[3]);
            }
        }
    }


    [System.Serializable]
    public class PoseItem
    {
        public BoneItem chest;
        public BoneItem head;
        public BoneItem hips;
        public BoneItem jaw;
        public BoneItem leftEye;
        public BoneItem leftFoot;
        public BoneItem leftHand;
        public BoneItem leftIndexDistal;
        public BoneItem leftIndexIntermediate;
        public BoneItem leftIndexProximal;
        public BoneItem leftLittleDistal;
        public BoneItem leftLittleIntermediate;
        public BoneItem leftLittleProximal;
        public BoneItem leftLowerArm;
        public BoneItem leftLowerLeg;
        public BoneItem leftMiddleDistal;
        public BoneItem leftMiddleIntermediate;
        public BoneItem leftMiddleProximal;
        public BoneItem leftRingDistal;
        public BoneItem leftRingIntermediate;
        public BoneItem leftRingProximal;
        public BoneItem leftShoulder;
        public BoneItem leftThumbDistal;
        public BoneItem leftThumbIntermediate;
        public BoneItem leftThumbProximal;
        public BoneItem leftToes;
        public BoneItem leftUpperArm;
        public BoneItem leftUpperLeg;
        public BoneItem neck;
        public BoneItem rightEye;
        public BoneItem rightFoot;
        public BoneItem rightHand;
        public BoneItem rightIndexDistal;
        public BoneItem rightIndexIntermediate;
        public BoneItem rightIndexProximal;
        public BoneItem rightLittleDistal;
        public BoneItem rightLittleIntermediate;
        public BoneItem rightLittleProximal;
        public BoneItem rightLowerArm;
        public BoneItem rightLowerLeg;
        public BoneItem rightMiddleDistal;
        public BoneItem rightMiddleIntermediate;
        public BoneItem rightMiddleProximal;
        public BoneItem rightRingDistal;
        public BoneItem rightRingIntermediate;
        public BoneItem rightRingProximal;
        public BoneItem rightShoulder;
        public BoneItem rightThumbDistal;
        public BoneItem rightThumbIntermediate;
        public BoneItem rightThumbProximal;
        public BoneItem rightToes;
        public BoneItem rightUpperArm;
        public BoneItem rightUpperLeg;
        public BoneItem spine;
        public BoneItem upperChest;
    }

    [System.Serializable]
    public class BoneItem
    {
        // positionは必須でない
        // public double[] position;

        // 関節角度の四元数
        public float[] rotation;
    }
}

VRMPoseImporterEditor.cs

// https://warapuri.com/post/24185933889/unity-inspector-editor%E4%B8%8A%E3%81%ABdragdrop%E3%81%97%E3%81%9F%E3%81%84

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;

[CustomEditor(typeof(VRMPoseImporter))]
public class VRMPoseImporterEditor : Editor
{
    private SerializedObject m_Object;
    private SerializedProperty m_FilePath;

    public void OnEnable()
    {
        m_Object = new SerializedObject(target);
        m_FilePath = m_Object.FindProperty("filePath");
    }

    public override void OnInspectorGUI()
    {
        m_Object.Update();
        GUILayout.Label("Soldier Properties", EditorStyles.boldLabel);
        EditorGUILayout.PropertyField(m_FilePath);

        var evt = Event.current;

        var dropArea = GUILayoutUtility.GetRect(0.0f, 50.0f, GUILayout.ExpandWidth(true));
        GUI.Box(dropArea, "Drag & Drop");
        int id = GUIUtility.GetControlID(FocusType.Passive);
        switch (evt.type)
        {
            case EventType.DragUpdated:
            case EventType.DragPerform:
                if (!dropArea.Contains(evt.mousePosition)) break;

                DragAndDrop.visualMode = DragAndDropVisualMode.Copy;
                DragAndDrop.activeControlID = id;

                if (evt.type == EventType.DragPerform)
                {
                    DragAndDrop.AcceptDrag();

                    foreach (var draggedObject in DragAndDrop.objectReferences)
                    {
                        Debug.Log("Drag Object:" + AssetDatabase.GetAssetPath(draggedObject));
                        m_FilePath.stringValue = AssetDatabase.GetAssetPath(draggedObject);
                        VRMPoseImporter targetComp = target as VRMPoseImporter;
                        targetComp.loadJson(AssetDatabase.GetAssetPath(draggedObject));
                    }
                    DragAndDrop.activeControlID = 0;
                }
                Event.current.Use();
                break;
        }

        m_Object.ApplyModifiedProperties();
    }
}

VRMお手軽ポーズのjsonをUnityで読み込む

https://scrapbox.io/ke456memo/YATTA!駆動開発_No.07_「VRMお手軽ポーズのjsonをUnityで読み込む」
のプログラム