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Question by dittizardichu · Jun 01, 2020 at 10:43 PM · c#spriteanimatorunity 2d

How to change animator states from a key press?

I am working on a small beat-em-up game as a summer project. I am stuck trying to change the sprite animation when a key is pressed.

Here is my code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Test : MonoBehaviour
 {
     Animator anim;
     void Start()
     {
         anim = gameObject.GetComponent<Animator>();
     }
 
     void Update()
     {
         if (this.anim.GetCurrentAnimatorStateInfo(0).IsName("Jotaro Idle"))
         {
             if (Input.GetKey(KeyCode.D))
                 anim.SetTrigger("WalkRightfromIdle");
             else if (Input.GetKey(KeyCode.A))
                 anim.SetTrigger("WalkLeftFromIdle");
         }
     }
 }

Here is a screenshot of my animator window (each transition is controlled by a trigger) : https://imgur.com/a/f93GrAn

Any help would be appreciated.

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Answer by chor64 · Jun 01, 2020 at 11:31 PM

Its easier to use a blend tree. Instead of individual triggers, in a blend tree, you use floats to indicate where to blend, that means that you can have all of the three animations in only one state.

To create a blend tree, right click and select "create blend tree". In the blend tree you can specify a float parameter and some animation clips. Create a float parameter and set the blend tree parameter to that. Add the idle and walk animations, then set the idle animation to have a blend value of 0f, then -1f for the left walk animation and 1f to the right walk animation.

And the script should be like this:

      void Update()
      {
              if (Input.GetKey(KeyCode.D))
                  anim.SetFloat("YourBlendTreeFloat", 1f);
              else if (Input.GetKey(KeyCode.A))
                  anim.SetFloat("YourBlendTreeFloat", -1f);
              else
                  anim.SetFloat("YourBlendTreeFloat", 0f);
      }
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