How can I get Child objects' Rigidbody Component?

How can I get Rigidbody Component of Child object?

I want to get Rigidbody component of Waist of Character,
and rotate it.

Now, my script rotate not only Waist but also Entire body.



Thanks!

 

Maybe a public variable or

Code (CSharp):

1. Rb = transform.GetChild(0).GetComponent<Rigidbody>();

 

Thanks to your reply!
I change the code below that you recommended.
But, It does not work. Is there any mistake? (I'm noob)

Rigidbody rb; (I am already using variable name rb to move Character)
Rigidbody rb1; (for rotate waist only)

void Start() {
rb = GetComponent<Rigidbody>();
rb1 = transform.GetChild(0).GetComponent<Rigidbody>();
}

void Update(){
float _xRotation = Input.GetAxisRaw("Mouse Y");
Vector3 _characterRotationX = new Vector3(-(_xRotation), 0f, 0f) * lookSensitivity;
rb1.MoveRotation(rb1.rotation * Quaternion.Euler(_characterRotationX));
}

 

Sorry, my bad. Try this:

Code (CSharp):

1. Vector3 _characterRotationX = new Vector3(-(_xRotation), 0f, 0f) * lookSensitivity * Time.deltaTime;

 

many Thanks Sir!!
below 4 sentences are right? I'm not sure (because I'm noob)
there is no error, but it doesn't work yet. (Is there any way to check simply that GetComponent rb1 propely?)

Rigidbody rb1;
rb1 = transform.GetChild(0).GetComponent<Rigidbody>();
Vector3 _characterRotationX = new Vector3(-(_xRotation), 0f, 0f) * lookSensitivity * Time.deltaTime;
rb1.MoveRotation(rb1.rotation * Quaternion.Euler(_characterRotationX));

 

1. Try GetAxis() instead of GetAxisRaw()
2. You can make rb1 a public variable and validate through editor.
3. If that wont work, make _characterRotationX a public global variable and test it on runtime. Is it always 0?

 

public variable _xRotation is work!
I find a solution!
if Is Kinematic -> true, waist can rotate. but, character cannot move!

 

I have a question: Is there a specific reason for rotating with rb instead of transform?

 

Rob is referencing the transform on the component with your rigid body.

https://docs.unity3d.com/ScriptReference/Transform.html

 

there is no specific reason! I know that method only! (I'm noob)
could you let me know another method to rotate the ragdoll waist?

 

https://docs.unity3d.com/ScriptReference/Transform-rotation.html
or
https://docs.unity3d.com/ScriptReference/Transform.Rotate.html

I dont know which one is more stable or efficient but i'd use transform.Rotate