Issues with Mathf.MoveTowards

Question

Hi, I'm having issues with Mathf.MoveTowards. I want to interpolate between 1 and 0 over time with a public float "fadeValue". But the console yields jumpy results from 1, 0, randomly increasing and decreasing till it reaches 0 eventually.

using UnityEngine; using System.Collections;

 public class CloudBehaviour : MonoBehaviour {
     public float cloudSpeed = 1;
     public float cloudScaleMin = 1;
     public float cloudScaleMax = 1;
     [Range(0f, 355f)]
     public float rotationThreshould;
     public float fadeValue = 10;
     private MeshRenderer meshrenderer;
     private float cloudScale;
     private float fade;
     
 
     // Use this for initialization
     void Start () {
         meshrenderer = GetComponent<MeshRenderer>();
         cloudScale = Random.Range(cloudScaleMin, cloudScaleMax);
         transform.localScale += new Vector3(cloudScale, cloudScale, cloudScale);
         transform.Rotate(0f, Random.Range(0f, rotationThreshould), 0f);
 
     }
     
     // Update is called once per frame
     void Update () {
         transform.position += new Vector3(cloudSpeed * Time.deltaTime, 0f, 0f);
         fade = Mathf.MoveTowards(1f, 0f, fadeValue * Time.deltaTime);
         meshrenderer.material.SetFloat("_AlphaLevel", fade);
         Debug.Log(fade);
     }
       
 }

Answer 1

Best Answer

Answer by ScaniX · Aug 23, 2016 at 12:19 PM

MoveTowards should be called on the current value, you keep calling it on the value 1. Try the following instead. Your script is supposed to immediately fade it out to 0 and stay there?

  public class CloudBehaviour : MonoBehaviour {
      public float cloudSpeed = 1;
      public float cloudScaleMin = 1;
      public float cloudScaleMax = 1;
      [Range(0f, 355f)]
      public float rotationThreshould;
      public float fadeValue = 10;
      private MeshRenderer meshrenderer;
      private float cloudScale;
      private float fade = 1f;
      
  
      // Use this for initialization
      void Start () {
          meshrenderer = GetComponent<MeshRenderer>();
          cloudScale = Random.Range(cloudScaleMin, cloudScaleMax);
          transform.localScale += new Vector3(cloudScale, cloudScale, cloudScale);
          transform.Rotate(0f, Random.Range(0f, rotationThreshould), 0f);
  
      }
      
      // Update is called once per frame
      void Update () {
          transform.position += new Vector3(cloudSpeed * Time.deltaTime, 0f, 0f);
          fade = Mathf.MoveTowards(fade, 0f, fadeValue * Time.deltaTime);
          meshrenderer.material.SetFloat("_AlphaLevel", fade);
          Debug.Log(fade);
      }
        
  }

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yaaks83 · Aug 23, 2016 at 12:23 PM 0

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Thanks! I will try what you've mentioned. I want it to fade to zero over time and then destroy gameobject when its zero.

yaaks83 · Aug 23, 2016 at 12:35 PM 0

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Okay! I tried it, but the Object fade goes to zero instantly and not over the fadeValue * Time.deltaTme mentioned.

ScaniX yaaks83 · Aug 23, 2016 at 12:37 PM 0

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Did you do both changes?

 private float fade = 1f;

and

 fade = Mathf.MoveTowards(fade, 0f, fadeValue * Time.deltaTime);

If yes: you probably need to lower the value of fadeValue.

yaaks83 ScaniX · Aug 23, 2016 at 12:40 PM 0

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Yes! I made both changes. I tried with fadeValue 10, and 100. for the fade to happen over 10, and 100 secs. What ma I doing wrong? :( I will try lowering the fadeValue.

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Issues with Mathf.MoveTowards

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