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KFAttached/RigAdaptors/ReverseAdaptors/TwistChainConstraintReverseAdaptor.cs

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+using UnityEngine;
+using UnityEngine.Animations.Rigging;
+
+[AddComponentMenu("")]
+public class TwistChainConstraintReverseAdaptor : RigAdaptorAbs
+{
+    [SerializeField]
+    private Transform m_Root;
+    [SerializeField]
+    private Transform m_Tip;
+    [SerializeField]
+    private string m_RootTarget;
+    [SerializeField]
+    private string m_TipTarget;
+    [SerializeField]
+    private AnimationCurve m_Curve;
+
+    public override void FindRigTargets()
+    {
+        var constraint = GetComponent<TwistChainConstraint>();
+        constraint.Reset();
+        constraint.weight = weight;
+        constraint.data.root = m_Root;
+        constraint.data.tip = m_Tip;
+        constraint.data.rootTarget = targetRoot.FindInAllChildren(m_RootTarget);
+        constraint.data.tipTarget = targetRoot.FindInAllChildren(m_TipTarget);
+        constraint.data.curve = m_Curve;
+    }
+
+    public override void ReadRigData()
+    {
+        var constraint = GetComponent<TwistChainConstraint>();
+        weight = constraint.weight;
+        m_Root = constraint.data.root;
+        m_Tip = constraint.data.tip;
+        m_RootTarget = constraint.data.rootTarget?.name;
+        m_TipTarget = constraint.data.tipTarget?.name;
+        m_Curve = constraint.data.curve;
+    }
+}