Script for Unity5 to achieve a shield effect

Shield.cs

using UnityEngine;
using System.Collections;

public class Shield : MonoBehaviour
{
    /// <summary>
    /// This is the maximum alpha value possible by this shield.
    /// From 0 to 255. When close to 255, more solid will be.
    /// </summary>
    public int MaxAlpha = 10;

    private Renderer myRenderer;

    void Start()
    {
        myRenderer = GetComponent<Renderer>();
    }

    /// <summary>
    /// Fades the shield after collision.
    /// To know more about Standard Shader properties, check out the material with the inspector in debug mode.
    /// </summary>
    /// <returns>Nothing.</returns>
    IEnumerator Fade()
    {
        Color color = myRenderer.sharedMaterial.color;

        for (float alpha = 1f; alpha >= 0; alpha -= 0.1f)
        {
            // Decrease alpha material color little by little
            color.a = (alpha * MaxAlpha) / 255;

            // Set shader properties
            myRenderer.sharedMaterial.SetVector("_Color", color);
            myRenderer.sharedMaterial.SetFloat("_Glossiness", alpha);
            
            yield return null;
        }
    }

    /// <summary>
    /// Shows up the shield in a collision.
    /// To know more about Standard Shader properties, check out the material with the inspector in debug mode.
    /// </summary>
    void Show()
    {
        // Give some alpha to material color
        Color color = myRenderer.sharedMaterial.color;
        color.a = MaxAlpha / 255;

        // Set shader properties
        myRenderer.sharedMaterial.SetVector("_Color", color);
        myRenderer.sharedMaterial.SetFloat("_Glossiness", 1);

        StartCoroutine(Fade());
    }

    void OnCollisionEnter(Collision collision)
    {
        foreach (var contact in collision.contacts)
        {
            Show();
        }
    }
}