Unity 5.1 Animator Controller not transitioning

Question

I have created an Animator Controller (called Player) and assigned it to the Animator field of my humanoid avatar, as well as simple animation states with suitable transitions. Please see the two attached images.

I have attached a script, containing the following code, to my avatar game object, but I wonder what I am missing or doing wrong that the transition from Idle to Walk does not take place, even though I can see that the speed variable increases when I press W.

Could someone please help me understand the problem?

using UnityEngine;
using System.Collections;

public class CharAnim : MonoBehaviour
{
    private Animator animator;
    float speed;

    void Start()
    {
        animator = GetComponent<Animator>();
    }

    void Update()
    {    
      animator.SetFloat( "speed", Input.GetAxis("Vertical") );

      if ( Input.GetKeyDown( KeyCode.W ) && ( speed > 0.5f ) ) 
      {
          animator.SetTrigger("Walk");
      }
      else 
      {
          animator.SetTrigger("Idle");
      }
    }
}

x

Answer 1

The problem in your code is, animator.SetTrigger("Walk"); gets called in a single frame when you pressed the key and animator.SetTrigger("Idle"); gets called for the rest of the frames.

Try changing Input.GetKeyDown( KeyCode.W ) to Input.GetKey( KeyCode.W ). The former returns true only once, the instant when you press down the key, whereas the latter returns true until you release the key. Something like :

void Update ()
{
    if(Input.GetKey(KeyCode.W))
    {
        animator.SetTrigger("Walk");
    }
    else            
        animator.SetTrigger("Idle");
}

On a side note, you don't need the speed variable in the Animator to trigger walk animation, since you are already doing that using W.

Idle -> Walk

Walk -> Idle