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Question by jb777 · Oct 23, 2011 at 11:24 PM · instantiateprefabvelocitynullreferenceexceptionragdoll

initial velocity for instantiated ragdoll prefab

Im instantiating a ragdoll prefab and I need it to have an initial velocity. I keep getting hit with null reference exceptions.

(the object is destroyed when the space bar is pressed)

 public Rigidbody rag;
 
 void OnDestroy()
 {
 
 rag = Instantiate(ragdoll, transform.position,transform.rotation) as Rigidbody;
 rag.AddForce(100,100,100);//null reference at this line
 }
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Answer by syclamoth · Oct 25, 2011 at 01:33 AM

Are you instantiating an entire ragdoll prefab? If so, it's unlikely to have just a single rigidbody which controls the entire ragdoll. Try doing something like this, instead (without the public rigidbody, at the top)-

 void OnDestroy()
 {
     Vector3 startingVelocity = rigidbody.velocity;
     // Assuming you have a rigidbody on your character, otherwise work this out some other way
 
     GameObject rag = Instantiate(ragdoll, transform.position, transform.rotation) as GameObject;
     foreach(Rigidbody body in rag.GetComponentsInChildren<Rigidbody>())
     {
         body.velocity = startingVelocity;
     }
 }
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avatar image jb777 · Oct 27, 2011 at 02:42 PM 0
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Thanks alot. I was able to get the script working. I need to start using foreach more. Its helpful.

avatar image The-Arc-Games · Nov 04, 2011 at 08:02 AM 0
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Otherwise just be sure that there's no kinematic rigidobdy in the ragdoll, and add a very big force in the source collider (the one to which all the others are necessarily connected, directly or indirectly)!

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