koobas.hobune.stream
NullReferenceException when trying to animate sprite
Hello,
I have been trying to animate a sprite. I have some animations set up, added an animation controller to my object and configured the controller in the animator tab, but when I try to change the value of my State Parameter, the following error shows:
NullReferenceException: Object reference not set to an instance of an object
Here is the code where I am trying to change the animation:
using UnityEngine;
using System.Collections;
public class PlayerController : MonoBehaviour {
Animator animator;
public KeyCode left;
public KeyCode right;
// Use this for initialization
void Start () {
}
void FixedUpdate () {
if (Input.GetKey (left)) {
animator.SetInteger ("State", 2);
}
if (Input.GetKey (right)) {
animator.SetInteger ("State", 2);
}
}
}
I am trying to change the value of State to 2, which should trigger the transition to my "run" animation.
The Animator animator; variable is never being set, so it's staying at its default value of null, and when a method is called on null it results in a NullReferenceException. Try putting this in the Start() method to set the variable to the Animator attached to the same GameObject:
animator = GetComponent<Animator>();
After putting this code in the Start function, it has stopped the errors from showing, but my sprite doesn't change animations. I have double-checked the animator file to make sure the transitions are set up, but nothing happens when I try to change the value of State.
Could you post a screenshot of the Parameters tab of the animator controller in question?
Thanks for the reply.
That stops the errors from showing, but when I write animator.SetInteger ("State", 2);, it does not switch animations.
I have double-checked the animator controller file, and it is set to change when State equals 2. In the tutorials I have looked at, this seems to work fine, so I'm not sure what I'm doing wrong.
There are a number of things that could be going wrong. Posting a screenshot of the Parameters tab will significantly help with diagnosing the problem.
Whoops, just found the problem. It seems like I had misconfigured the animator file and gotten the State values mixed up.
Thanks for helping me solve the problem guys.
