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Question by RobertOne · Jun 02, 2017 at 10:25 AM · getcomponentjointcharacterjoint

change lowTwistLimit.limit at runtime?

hey, how can i change the lowTwistLimit.limit on a character joint to zero? i tried:

 gameObject.GetComponent<CharacterJoint>().lowTwistLimit.limit = 0;

but that results in "Cannot modify a value type return value of `UnityEngine.CharacterJoint.swing1Limit'. Consider storing the value in a temporary variable"

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Answer by HarshadK · Jun 02, 2017 at 11:16 AM

The lowTwistLimit is of type [SoftJointLimit][1] which is a struct. So you can not modify just a single value of it as you are trying to do. This is similar to what happens when you try to update just one value of a transform's position since position is a Vector3 which is a struct. So you need to build a new struct with your desired values and assign it. Something like:

 CharacterJoint charJoint = gameObject.GetComponent<CharacterJoint>();
 SoftJointLimit jointLimit = charJoint.lowTwistLimit;
 jointLimit.limit = 0;
 // Here we assign the updated struct back to lowTwistLimit of character joint.
 charJoint.lowTwistLimit = jointLimit;


[1]: https://docs.unity3d.com/ScriptReference/SoftJointLimit.html

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