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Question by unity_learner · Mar 20, 2015 at 05:26 PM · errorrigidbodybeginnertutorial

Why is rigidbody.AddForce not working?

Hi,

I am new to Unity Development and I was working on Roll a ball tutorial when I encountered during the scripting phase.Whenever I type rigidbody.AddForce,it puts the AddForce in red letters and it shows me

"Error CS0117:UnityEngine.Component does not contain a definition for 'AddForce'".

Also,at the same time I keep getting the message to update the API but if I comment out that piece of code,it goes away.I have attached pictures of both the problems and I appreciate any help or suggestion regarding the solution.Thanks!

alt text

alt text

script-problem.png (9.4 kB)
obsoleteapi-message.png (13.6 kB)
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Answer by Digital-Phantom · Mar 20, 2015 at 05:31 PM

I take it your using unity 5.

When you get that little pop up screen it basically means the some of the wording/code that was used in earlier version scripts no longer exists in unity 5. Just click the "I made a backup..." button and unity will auto correct for you.

;)

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Answer by Landern · Mar 20, 2015 at 05:29 PM

Does your script have a rigidbody variable?

Have you referenced it if it exists?

 private RigidBody3D rigidbody;
 void Start()
 {
   rigidbody = GetComponent<RigidBody3D>();
 }

if not, you need to get the component if the component(RigidBody3d) exists on the same gameobject that the script you have your FixedUpdate exists on.

 void FixedUpdate()
 {
   RigidBody3D rigidbody = GetComponent<RigidBody3D>();
 
   // your other code
 
   rigidbody.AddForce(new Vector3(0,0,0)); // set your values here, or provide another vector3 types from another object.
 }

The variable(what ever you use) that you're using must be a RigidBody3D/2D type and have a reference to a RigidBody.

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Answer by TBone71 · Jun 01, 2015 at 12:43 PM

I just made the problem disappear by writing the code attached, i.e. the errormessage disappeared.

alt text


bildschirmfoto-2015-06-01-um-105445.png (243.6 kB)
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