[Solved] Fading Two Materials Using Color

I am sharing this code because I had a hard time finding something like this. I hope it will help someone else.

Objective

1. Fade out first material when FOV changes

2. Change material to second material

3. Fade in second material to max alpha color

Note Second material started with an alpha of zero from Material Inspector.

Solution

Check when the FOV changes to start process. Start decreasing alpha color using linear method, once it reaches zero change to second material and fade in to max alpha.

Code

     // Public variable paremeter for Unity inspector input
     public float smooth;
     Material worldMap;
     public Material australiaMap;
 
     //Private variables for script mod
     private Renderer rend;
     private float colorOrigin;
     private Color colorWorldMap;
     private Color colorAustraliaMap;
     private float originFOV;
     private float currentFOV;
 
     // Use this for initialization
     void Start()
     {
         //get tender component
         rend = GetComponent<Renderer>();
 
         //set variable with material at start
         worldMap = rend.material;
 
         //set variable with color at start
         colorWorldMap = rend.material.color;
 
         //set variable with initial FOV
         originFOV = Camera.main.fieldOfView;
   
     }
 
     // Update is called once per frame
     void Update()
     {
        
         //update alpha color every frame
         colorOrigin = rend.material.color.a;
 
         //update FOV every frame
         currentFOV = Camera.main.fieldOfView;
 
         //check if FOV has changed from start, if so start fading
         if (currentFOV != originFOV)
         {
             //fade initial material until aplha color is zero and material is worlmap
             if (colorOrigin > 0 & rend.material == worldMap)
             {
                 //call function to fade out worlmap
                 StrayaFadeOut();
             }
             //when apha color is zero change material to Australia map
             else
             {
                 //Fade in Australia map function - Material starts with apha color at zero
                 StrayaFadeIn();
             }
         }
     }
 
     //function to fade out Worlmap
     void StrayaFadeOut()
     {
         //set alpha color fade out using linear method to zero
         colorWorldMap.a = Mathf.Lerp(colorOrigin, -smooth, Time.deltaTime);
         
         //set material color to previous value
         rend.material.color = colorWorldMap;
 
         //change color origin to new alpha color
         colorOrigin = colorWorldMap.a;
     }
 
     //function to fade ni australia map
     void StrayaFadeIn()
     {
         //chage material to australia map
         rend.material = australiaMap;
 
         //set smooth to max alpha color value
         smooth = 255;
 
         //set variable with current alpha color
         colorAustraliaMap = rend.material.color;
 
         //fade in alpha color using linear method
         colorAustraliaMap.a = Mathf.Lerp(0.0f, smooth, Time.deltaTime);
 
         //change alpha color of current material
         rend.material.color = colorAustraliaMap;
     }
 }

Feel free to comment and criticize the code. This was my solution, I was not satisfied with the others I googled. I do not know if this the most elegant way, but it worked like a charm.

Cheers