impl Vrm10RuntimeSpringBone.RestoreInitialTransform

2026-08-28 05:44:48 -05:00 · 2024-07-17 14:42:58 +09:00
parent b69b3760e3
commit a9d645d4ff
4 changed files with 332 additions and 68 deletions
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeSpringBone
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10RuntimeSpringBone
@@ -139,5 +139,24 @@ namespace UniVRM10
                    throw new ArgumentOutOfRangeException();
            }
        }
+
+        public void RestoreInitialTransform()
+        {
+            // Spring の joint に対応する transform の回転を初期状態
+            foreach (var (k, v) in m_initialData.TransformIndexMap)
+            {
+                k.localRotation = v.InitialLocalRotation;
+            }
+
+            // 初期状態にしたtransformを使って spring logic を構築
+            m_initialData.BlittableLogics.Clear();
+            foreach (var spring in m_initialData.Springs)
+            {
+                m_initialData.AddLogic(spring);
+            }
+
+            // DOTS バッファーを更新
+            m_initialData.SyncAndZeroVelocity(m_fastSpringBoneBuffer.Logics);
+        }
    }
 }
--- a/Assets/VRM10/Runtime/FastSpringBone/InputPorts/FastSpringBoneBufferBuilder.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/InputPorts/FastSpringBoneBufferBuilder.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using Unity.Collections;
 using UnityEngine;
 using UnityEngine.Profiling;
 using UniVRM10.FastSpringBones.Blittables;
@@ -13,9 +14,17 @@ namespace UniVRM10.FastSpringBones.System
        public readonly List<BlittableCollider> BlittableColliders = new();
        public readonly List<BlittableLogic> BlittableLogics = new();
        public readonly Transform[] Transforms;
-
-        public FastSpringBoneBufferBuilder(IReadOnlyList<FastSpringBoneSpring> springs, bool simulateLastBone = false)
+        public struct TransformInfo
        {
+            public int Index;
+            public Quaternion InitialLocalRotation;
+        }
+        public readonly IDictionary<Transform, TransformInfo> TransformIndexMap;
+        public readonly FastSpringBoneSpring[] Springs;
+
+        public FastSpringBoneBufferBuilder(FastSpringBoneSpring[] springs, bool simulateLastBone = false)
+        {
+            Springs = springs;
            Profiler.BeginSample("FastSpringBone.ConstructBuffers.BufferBuilder");
            var transformHashSet = new HashSet<Transform>();
            foreach (var spring in springs)
@@ -34,8 +43,12 @@ namespace UniVRM10.FastSpringBones.System
                if (spring.center != null) transformHashSet.Add(spring.center);
            }
            Transforms = transformHashSet.ToArray();
-            var transformIndexDictionary = Transforms.Select((trs, index) => (trs, index))
-                .ToDictionary(tuple => tuple.trs, tuple => tuple.index);
+            TransformIndexMap = Transforms.Select((trs, index) => (trs, index))
+                .ToDictionary(tuple => tuple.trs, tuple => new TransformInfo
+                {
+                    Index = tuple.index,
+                    InitialLocalRotation = tuple.trs.localRotation,
+                });

            foreach (var spring in springs)
            {
@@ -51,14 +64,14 @@ namespace UniVRM10.FastSpringBones.System
                        startIndex = BlittableJoints.Count,
                        count = simulateLastBone ? spring.joints.Length : spring.joints.Length - 1,
                    },
-                    centerTransformIndex = spring.center ? transformIndexDictionary[spring.center] : -1,
+                    centerTransformIndex = spring.center ? TransformIndexMap[spring.center].Index : -1,
                };
                BlittableSprings.Add(blittableSpring);

                BlittableColliders.AddRange(spring.colliders.Select(collider =>
                {
                    var blittable = collider.Collider;
-                    blittable.transformIndex = transformIndexDictionary[collider.Transform];
+                    blittable.transformIndex = TransformIndexMap[collider.Transform].Index;
                    return blittable;
                }));
                BlittableJoints.AddRange(spring.joints
@@ -68,56 +81,62 @@ namespace UniVRM10.FastSpringBones.System
                        return blittable;
                    }));

-                for (var i = 0; i < (simulateLastBone ? spring.joints.Length : spring.joints.Length - 1); ++i)
+                AddLogic(spring, simulateLastBone);
+
+            }
+            Profiler.EndSample();
+        }
+
+        public void AddLogic(FastSpringBoneSpring spring, bool simulateLastBone = false)
+        {
+            for (var i = 0; i < (simulateLastBone ? spring.joints.Length : spring.joints.Length - 1); ++i)
+            {
+                var joint = spring.joints[i];
+                var tailJoint = i + 1 < spring.joints.Length ? spring.joints[i + 1] : (FastSpringBoneJoint?)null;
+                var parentJoint = i - 1 >= 0 ? spring.joints[i - 1] : (FastSpringBoneJoint?)null;
+                var localPosition = Vector3.zero;
+                if (tailJoint.HasValue)
                {
-                    var joint = spring.joints[i];
-                    var tailJoint = i + 1 < spring.joints.Length ? spring.joints[i + 1] : (FastSpringBoneJoint?)null;
-                    var parentJoint = i - 1 >= 0 ? spring.joints[i - 1] : (FastSpringBoneJoint?)null;
-                    var localPosition = Vector3.zero;
-                    if (tailJoint.HasValue)
+                    localPosition = tailJoint.Value.Transform.localPosition;
+                }
+                else
+                {
+                    if (parentJoint.HasValue)
                    {
-                        localPosition = tailJoint.Value.Transform.localPosition;
+                        var delta = joint.Transform.position - parentJoint.Value.Transform.position;
+                        localPosition =
+                            joint.Transform.worldToLocalMatrix.MultiplyPoint(joint.Transform.position + delta);
                    }
                    else
                    {
-                        if (parentJoint.HasValue)
-                        {
-                            var delta = joint.Transform.position - parentJoint.Value.Transform.position;
-                            localPosition =
-                                joint.Transform.worldToLocalMatrix.MultiplyPoint(joint.Transform.position + delta);
-                        }
-                        else
-                        {
-                            localPosition = Vector3.down;
-                        }
+                        localPosition = Vector3.down;
                    }
-
-                    var scale = tailJoint.HasValue ? tailJoint.Value.Transform.lossyScale : joint.Transform.lossyScale;
-                    var localChildPosition =
-                        new Vector3(
-                            localPosition.x * scale.x,
-                            localPosition.y * scale.y,
-                            localPosition.z * scale.z
-                        );
-
-                    var worldChildPosition = joint.Transform.TransformPoint(localChildPosition);
-                    var currentTail = spring.center != null
-                        ? spring.center.InverseTransformPoint(worldChildPosition)
-                        : worldChildPosition;
-                    var parent = joint.Transform.parent;
-                    BlittableLogics.Add(new BlittableLogic
-                    {
-                        headTransformIndex = transformIndexDictionary[joint.Transform],
-                        parentTransformIndex = parent != null ? transformIndexDictionary[parent] : -1,
-                        currentTail = currentTail,
-                        prevTail = currentTail,
-                        localRotation = joint.DefaultLocalRotation,
-                        boneAxis = localChildPosition.normalized,
-                        length = localChildPosition.magnitude
-                    });
                }
+
+                var scale = tailJoint.HasValue ? tailJoint.Value.Transform.lossyScale : joint.Transform.lossyScale;
+                var localChildPosition =
+                    new Vector3(
+                        localPosition.x * scale.x,
+                        localPosition.y * scale.y,
+                        localPosition.z * scale.z
+                    );
+
+                var worldChildPosition = joint.Transform.TransformPoint(localChildPosition);
+                var currentTail = spring.center != null
+                    ? spring.center.InverseTransformPoint(worldChildPosition)
+                    : worldChildPosition;
+                var parent = joint.Transform.parent;
+                BlittableLogics.Add(new BlittableLogic
+                {
+                    headTransformIndex = TransformIndexMap[joint.Transform].Index,
+                    parentTransformIndex = parent != null ? TransformIndexMap[parent].Index : -1,
+                    currentTail = currentTail,
+                    prevTail = currentTail,
+                    localRotation = joint.DefaultLocalRotation,
+                    boneAxis = localChildPosition.normalized,
+                    length = localChildPosition.magnitude
+                });
            }
-            Profiler.EndSample();
        }

        public unsafe void SetExternalDataPtr(BlittableExternalData* externalData)
@@ -129,14 +148,18 @@ namespace UniVRM10.FastSpringBones.System
                //     ExternalData = externalData,
                // };
                var b = BlittableSprings[i];
-                BlittableSprings[i] = new BlittableSpring
-                {
-                    centerTransformIndex = b.centerTransformIndex,
-                    colliderSpan = b.colliderSpan,
-                    logicSpan = b.logicSpan,
-                    transformIndexOffset = b.transformIndexOffset,
-                    ExternalData = externalData,
-                };
+                b.ExternalData = externalData;
+                BlittableSprings[i] = b;
+            }
+        }
+
+        public unsafe void SyncAndZeroVelocity(NativeArray<BlittableLogic> logics)
+        {
+            for (int i = 0; i < BlittableLogics.Count; ++i)
+            {
+                var l = BlittableLogics[i];
+                l.prevTail = l.currentTail;
+                logics[i] = BlittableLogics[i];
            }
        }
    }
--- a/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity
+++ b/Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity
@@ -232,7 +232,7 @@ RectTransform:
  m_ConstrainProportionsScale: 0
  m_Children: []
  m_Father: {fileID: 339774397}
-  m_RootOrder: 15
+  m_RootOrder: 16
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -773,7 +773,7 @@ RectTransform:
  m_ConstrainProportionsScale: 0
  m_Children: []
  m_Father: {fileID: 339774397}
-  m_RootOrder: 4
+  m_RootOrder: 3
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -1236,14 +1236,15 @@ RectTransform:
  - {fileID: 1621794411}
  - {fileID: 2009818432}
  - {fileID: 168425995}
-  - {fileID: 1307084561}
  - {fileID: 224350191}
  - {fileID: 1791103379}
  - {fileID: 1311520909}
+  - {fileID: 1307084561}
  - {fileID: 974864191}
  - {fileID: 1767706907}
  - {fileID: 1557052150}
  - {fileID: 1728528388}
+  - {fileID: 704896193}
  - {fileID: 597950322}
  - {fileID: 935566651}
  - {fileID: 634488421}
@@ -1823,7 +1824,7 @@ RectTransform:
  m_ConstrainProportionsScale: 0
  m_Children: []
  m_Father: {fileID: 339774397}
-  m_RootOrder: 11
+  m_RootOrder: 12
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -1904,7 +1905,7 @@ RectTransform:
  - {fileID: 154330168}
  - {fileID: 1954133885}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 17
+  m_RootOrder: 18
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -1991,7 +1992,7 @@ RectTransform:
  - {fileID: 2010083454}
  - {fileID: 1081455630}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 13
+  m_RootOrder: 14
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -2247,6 +2248,128 @@ MonoBehaviour:
  m_ChildScaleWidth: 0
  m_ChildScaleHeight: 0
  m_ReverseArrangement: 0
+--- !u!1 &704896192
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 704896193}
+  - component: {fileID: 704896196}
+  - component: {fileID: 704896195}
+  - component: {fileID: 704896194}
+  m_Layer: 5
+  m_Name: ResetSpringBone
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!224 &704896193
+RectTransform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 704896192}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children:
+  - {fileID: 983782643}
+  m_Father: {fileID: 339774397}
+  m_RootOrder: 11
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+  m_AnchorMin: {x: 0, y: 0}
+  m_AnchorMax: {x: 0, y: 0}
+  m_AnchoredPosition: {x: 0, y: 0}
+  m_SizeDelta: {x: 162, y: 30}
+  m_Pivot: {x: 0.5, y: 0.5}
+--- !u!114 &704896194
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 704896192}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 4e29b1a8efbd4b44bb3f3716e73f07ff, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_Navigation:
+    m_Mode: 3
+    m_WrapAround: 0
+    m_SelectOnUp: {fileID: 0}
+    m_SelectOnDown: {fileID: 0}
+    m_SelectOnLeft: {fileID: 0}
+    m_SelectOnRight: {fileID: 0}
+  m_Transition: 1
+  m_Colors:
+    m_NormalColor: {r: 1, g: 1, b: 1, a: 1}
+    m_HighlightedColor: {r: 0.9607843, g: 0.9607843, b: 0.9607843, a: 1}
+    m_PressedColor: {r: 0.78431374, g: 0.78431374, b: 0.78431374, a: 1}
+    m_SelectedColor: {r: 0.9607843, g: 0.9607843, b: 0.9607843, a: 1}
+    m_DisabledColor: {r: 0.78431374, g: 0.78431374, b: 0.78431374, a: 0.5019608}
+    m_ColorMultiplier: 1
+    m_FadeDuration: 0.1
+  m_SpriteState:
+    m_HighlightedSprite: {fileID: 0}
+    m_PressedSprite: {fileID: 0}
+    m_SelectedSprite: {fileID: 0}
+    m_DisabledSprite: {fileID: 0}
+  m_AnimationTriggers:
+    m_NormalTrigger: Normal
+    m_HighlightedTrigger: Highlighted
+    m_PressedTrigger: Pressed
+    m_SelectedTrigger: Highlighted
+    m_DisabledTrigger: Disabled
+  m_Interactable: 1
+  m_TargetGraphic: {fileID: 704896195}
+  m_OnClick:
+    m_PersistentCalls:
+      m_Calls: []
+--- !u!114 &704896195
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 704896192}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: fe87c0e1cc204ed48ad3b37840f39efc, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_Material: {fileID: 0}
+  m_Color: {r: 1, g: 1, b: 1, a: 1}
+  m_RaycastTarget: 1
+  m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
+  m_Maskable: 1
+  m_OnCullStateChanged:
+    m_PersistentCalls:
+      m_Calls: []
+  m_Sprite: {fileID: 10905, guid: 0000000000000000f000000000000000, type: 0}
+  m_Type: 1
+  m_PreserveAspect: 0
+  m_FillCenter: 1
+  m_FillMethod: 4
+  m_FillAmount: 1
+  m_FillClockwise: 1
+  m_FillOrigin: 0
+  m_UseSpriteMesh: 0
+  m_PixelsPerUnitMultiplier: 1
+--- !u!222 &704896196
+CanvasRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 704896192}
+  m_CullTransparentMesh: 0
 --- !u!1 &773923918
 GameObject:
  m_ObjectHideFlags: 0
@@ -3398,7 +3521,7 @@ RectTransform:
  - {fileID: 175751363}
  - {fileID: 1904789319}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 12
+  m_RootOrder: 13
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -3485,6 +3608,88 @@ CanvasRenderer:
  m_PrefabAsset: {fileID: 0}
  m_GameObject: {fileID: 974864190}
  m_CullTransparentMesh: 0
+--- !u!1 &983782642
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 983782643}
+  - component: {fileID: 983782645}
+  - component: {fileID: 983782644}
+  m_Layer: 5
+  m_Name: Text
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!224 &983782643
+RectTransform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 983782642}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
+  m_Father: {fileID: 704896193}
+  m_RootOrder: 0
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+  m_AnchorMin: {x: 0, y: 0}
+  m_AnchorMax: {x: 1, y: 1}
+  m_AnchoredPosition: {x: 0, y: 0}
+  m_SizeDelta: {x: 0, y: 0}
+  m_Pivot: {x: 0.5, y: 0.5}
+--- !u!114 &983782644
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 983782642}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 5f7201a12d95ffc409449d95f23cf332, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  m_Material: {fileID: 0}
+  m_Color: {r: 0.19607843, g: 0.19607843, b: 0.19607843, a: 1}
+  m_RaycastTarget: 1
+  m_RaycastPadding: {x: 0, y: 0, z: 0, w: 0}
+  m_Maskable: 1
+  m_OnCullStateChanged:
+    m_PersistentCalls:
+      m_Calls: []
+  m_FontData:
+    m_Font: {fileID: 10102, guid: 0000000000000000e000000000000000, type: 0}
+    m_FontSize: 14
+    m_FontStyle: 0
+    m_BestFit: 0
+    m_MinSize: 10
+    m_MaxSize: 40
+    m_Alignment: 4
+    m_AlignByGeometry: 0
+    m_RichText: 1
+    m_HorizontalOverflow: 0
+    m_VerticalOverflow: 0
+    m_LineSpacing: 1
+  m_Text: 'ResetSpring
+
+'
+--- !u!222 &983782645
+CanvasRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 983782642}
+  m_CullTransparentMesh: 0
 --- !u!1 &1007924635
 GameObject:
  m_ObjectHideFlags: 0
@@ -4950,7 +5155,7 @@ RectTransform:
  m_Children:
  - {fileID: 910859648}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 3
+  m_RootOrder: 6
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -5147,7 +5352,7 @@ RectTransform:
  - {fileID: 1866921958}
  - {fileID: 1767669911}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 6
+  m_RootOrder: 5
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -5444,7 +5649,7 @@ RectTransform:
  - {fileID: 452923209}
  - {fileID: 2090837017}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 16
+  m_RootOrder: 17
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -6444,7 +6649,7 @@ RectTransform:
  - {fileID: 62367395}
  - {fileID: 1037763549}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 14
+  m_RootOrder: 15
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
@@ -6619,6 +6824,7 @@ MonoBehaviour:
  m_pastePose: {fileID: 1307084564}
  m_showBoxMan: {fileID: 1767706908}
  m_pauseSpringBone: {fileID: 1728528389}
+  m_resetSpringBone: {fileID: 704896194}
  m_enableLipSync: {fileID: 935566650}
  m_enableAutoBlink: {fileID: 634488422}
  m_enableAutoExpression: {fileID: 1767738855}
@@ -6677,7 +6883,7 @@ RectTransform:
  - {fileID: 1166391799}
  - {fileID: 1140410864}
  m_Father: {fileID: 339774397}
-  m_RootOrder: 5
+  m_RootOrder: 4
  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
  m_AnchorMin: {x: 0, y: 0}
  m_AnchorMax: {x: 0, y: 0}
--- a/Assets/VRM10_Samples/VRM10Viewer/VRM10ViewerUI.cs
+++ b/Assets/VRM10_Samples/VRM10Viewer/VRM10ViewerUI.cs
@@ -30,6 +30,9 @@ namespace UniVRM10.VRM10Viewer
        [SerializeField]
        Toggle m_pauseSpringBone = default;

+        [SerializeField]
+        Button m_resetSpringBone = default;
+
        [SerializeField]
        Toggle m_enableLipSync = default;

@@ -255,6 +258,7 @@ namespace UniVRM10.VRM10Viewer
            m_openModel = buttons.First(x => x.name == "OpenModel");
            m_openMotion = buttons.First(x => x.name == "OpenMotion");
            m_pastePose = buttons.First(x => x.name == "PastePose");
+            m_resetSpringBone = buttons.First(x => x.name == "ResetSpringBone");

 #if UNITY_2022_3_OR_NEWER
            var toggles = GameObject.FindObjectsByType<Toggle>(FindObjectsSortMode.InstanceID);
@@ -351,6 +355,7 @@ namespace UniVRM10.VRM10Viewer
            m_openModel.onClick.AddListener(OnOpenModelClicked);
            m_openMotion.onClick.AddListener(OnOpenMotionClicked);
            m_pastePose.onClick.AddListener(OnPastePoseClicked);
+            m_resetSpringBone.onClick.AddListener(OnResetSpringBoneClicked);

            // load initial bvh
            if (m_motion != null)
@@ -490,6 +495,17 @@ namespace UniVRM10.VRM10Viewer
            }
        }

+        void OnResetSpringBoneClicked()
+        {
+            if (m_loaded != null)
+            {
+                if (m_loaded.Runtime != null)
+                {
+                    m_loaded.Runtime.SpringBone.RestoreInitialTransform();
+                }
+            }
+        }
+
        static IMaterialDescriptorGenerator GetVrmMaterialDescriptorGenerator(bool useUrp)
        {
            if (useUrp)