Issues with Mathf.MoveTowards

Questions & Answers
1

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);
    }
      
}
2

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);
     }
       
 }