Error CS1612

Question

I understand that others have had this problem and the answers I am seeing are stating that I need to make a temporary variable that effects whatever I need to edit. However, I am doing this and still getting the same error.

 void StopBall ()
 {
     if (rigidbody.velocity.x <= stopVelocityThreshold.x && rigidbody.velocity.x != 0f) {
         float tempX = 0;

         //Error occurs here
         rigidbody.velocity.x = tempX;

         Debug.Log("X Velocity Stopped");
     }
     if (rigidbody.velocity.z <= stopVelocityThreshold.z && rigidbody.velocity.z != 0f) {
         float tempZ = 0;

         //Error occurs here
         rigidbody.velocity.z = tempZ;

         Debug.Log("Z Velocity Stopped");
     }
     if (rigidbody.velocity == Vector3.zero) {
         CancelInvoke();
     }
 }

I don't understand what I am doing wrong. Any help would be appreciated.

Answer 1

Best Answer

Answer by btmedia14 · Aug 21, 2016 at 02:55 PM

@BenLuker The velocity property retrieved in this way must be assigned to a variable before its contents can be modified - its a C# thing for assignment of value types using copies not reference to original.

A couple of options

1) Create a Vector3 variable to hold the vector, modify as needed and reassign back to rigidbody

 Vector3 ballVelocity = rigidbody.velocity;
 ballVelocity.x = 0;              //or also update ballVelocity.y, ballVelocity.z if needed
 rigidbody.velocity = ballVelocity;

2) Use rigidbody.velocity.Set(x,y,z) method instead. So, if only changing x value:

 rigidbody.velocity.Set(0, rigidbody.velocity.y, rigidbody.velocity.z);

Note, Unity recommends, in most cases, to not modify velocity vector of a rigidbody as it can interfere with the physics simulations. https://docs.unity3d.com/ScriptReference/Rigidbody-velocity.html

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Error CS1612

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