How to set Character Joint "Twist Limit" to current transform rotation?

I noticed that the Character Joint's Low and High Twist Limit value is relative to its transform's rotation at the start of the scene (or whenever a Character Joint is added to the scene).

So all you have to do is add the Character Joint components at the time that you want to make the character a ragdoll. I didn't want to have to manually input the Character Joint values for each joint, so I kept all the Character Joints and instead stored their values like Connected Body, Axis, Swing Axis, etc. and destroyed the joints on Start(). Then I add new Character Joints and apply all the values back to each one accordingly at the time that I need the Character to be a ragdoll.

This way I can edit all the Character Joint values in the Editor like usual and then when I need the character to become a ragdoll, the new Character Joints will have the same values.

So all you have to do is store whatever information you need from all of the Character Joints at Start(), Destroy all the Character Joints, and then whenever you want to make the character a ragdoll you add all the Character Joints back like they were before. Boom, it works!

Here's a script that does just that!

 //This script is to be applied to the root GameObject
 
 using System.Collections.Generic;
 using UnityEngine;
 
 
 public class StiffRagdoll : MonoBehaviour
 {
 
     //Create a class to store whatever information you need from all the Character Joints
     public class CharacterJointInfo
     {
         //The GameObject this Character Joint will become a component of
         public GameObject gameObject;
 
         public Rigidbody connectedBody;
         public Vector3 axis, swingAxis;
         public SoftJointLimit lowTwistLimit, highTwistLimit, swing1Limit, swing2Limit;
     }
 
     //The list of all the Character Joint info which will be collected at Start()
     List<CharacterJointInfo> jointInfos = new List<CharacterJointInfo>();
 
 
     void Start()
     {
         SaveJointInfo();
     }
 
     //This stores the joint values from every joint and adds it to the jointInfos list
     void SaveJointInfo()
     {
         CharacterJoint[] characterJoints = GetComponentsInChildren<CharacterJoint>();
 
         //Store the information of each Character Joint
         foreach (var characterJoint in characterJoints)
         {
             CharacterJointInfo jointInfo = new CharacterJointInfo();
 
             jointInfo.gameObject = characterJoint.gameObject;
             jointInfo.connectedBody = characterJoint.connectedBody;
             jointInfo.axis = characterJoint.axis;
             jointInfo.swingAxis = characterJoint.swingAxis;
 
             jointInfo.lowTwistLimit = characterJoint.lowTwistLimit;
             jointInfo.highTwistLimit = characterJoint.highTwistLimit;
             jointInfo.swing1Limit = characterJoint.swing1Limit;
             jointInfo.swing2Limit = characterJoint.swing2Limit;
 
             //Add to jointInfos list
             jointInfos.Add(jointInfo);
 
             //Destroy character joint after storing
             Destroy(characterJoint);
         }
     }
 
     //Call this whenever you want it to become a ragdoll
     public void ActivateRagdoll()
     {
         //Do Ragdoll stuff like:
         //Disable animator
         //Enable each limb's Rigidbody
         //etc.        
 
         //Add the joints back with the saved info you stored
         AddCharacterJoints();
     }
 
     //This adds the Character Joint component to each body part that had it before
     //and assigns the values stored from the initial Character Joints
     void AddCharacterJoints()
     {
         //Create a new Character Joint for every stored joint
         //and assign the stored information for that specific joint.
         foreach (var jointInfo in jointInfos)
         {
             CharacterJoint newCharacterJoint = jointInfo.gameObject.AddComponent<CharacterJoint>();
 
             newCharacterJoint.connectedBody = jointInfo.connectedBody;
             newCharacterJoint.axis = jointInfo.axis;
             newCharacterJoint.swingAxis = jointInfo.swingAxis;
             newCharacterJoint.lowTwistLimit = jointInfo.lowTwistLimit;
             newCharacterJoint.highTwistLimit = jointInfo.highTwistLimit;
             newCharacterJoint.swing1Limit = jointInfo.swing1Limit;
             newCharacterJoint.swing2Limit = jointInfo.swing2Limit;
         }
     }
 }