From 5b815a874b94ded7485d178f190286d735e3d078 Mon Sep 17 00:00:00 2001
From: ousttrue <ousttrue@gmail.com>
Date: Tue, 19 Apr 2022 15:36:26 +0900
Subject: [PATCH] =?UTF-8?q?joint=20=E3=81=8C=E8=A4=87=E6=95=B0=E3=81=AE=20?=
 =?UTF-8?q?chain=20=E3=81=AB=E6=89=80=E5=B1=9E=E3=81=99=E3=82=8B=E5=A0=B4?=
 =?UTF-8?q?=E5=90=88=E3=81=AB=20AddComponent=20=E3=81=AB=E5=A4=B1=E6=95=97?=
 =?UTF-8?q?=E3=81=99=E3=82=8B?=
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---
 Assets/VRM10/Runtime/IO/Vrm10Importer.cs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
index 355b1fc47..fbb241a5b 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
@@ -615,7 +615,17 @@ namespace UniVRM10
                             // に基づきデフォルト値を補う
 
                             // node is required
-                            var joint = Nodes[gltfJoint.Node.Value].gameObject.AddComponent<VRM10SpringBoneJoint>();
+                            var go = Nodes[gltfJoint.Node.Value].gameObject;
+                            var joint = go.GetComponent<VRM10SpringBoneJoint>();
+                            if (joint != null)
+                            {
+                                // 仕様違反。マイグレーションで発生しうるのと、エクスポーターでの除外などがされていないので、
+                                // エラーにせずに飛ばす
+                                Debug.LogWarning($"duplicated spring joint: {Data.TargetPath}");
+                                continue;
+                            }
+
+                            joint = go.AddComponent<VRM10SpringBoneJoint>();
                             joint.m_jointRadius = gltfJoint.HitRadius.GetValueOrDefault(0.0f);
                             joint.m_dragForce = gltfJoint.DragForce.GetValueOrDefault(0.5f);
                             joint.m_gravityDir = gltfJoint.GravityDir != null ? Vector3InvertX(gltfJoint.GravityDir) : Vector3.down;