project-undercover/Project Undercover/Assets/Scripts/Glow/GlowObject.cs

using UnityEngine;
using System.Collections.Generic;

public class GlowObject : MonoBehaviour
{
	public Color GlowColor;
	public float LerpFactor = 10;

	public Renderer[] Renderers
	{
		get;
		private set;
	}

	public Color CurrentColor
	{
		get { return _currentColor; }
	}

    private List<Material> _materials = new List<Material>();
    private Color _currentColor;
    private Color _targetColor;

	protected virtual void Start()
	{
		Renderers = GetComponentsInChildren<Renderer>();

		foreach (var renderer in Renderers)
		{	
			_materials.AddRange(renderer.materials);
		}
	}

	protected void OnMouseEnter()
	{
		_targetColor = GlowColor;
		enabled = true;
	}

    protected void OnMouseExit()
	{
		_targetColor = Color.black;
        _targetColor.a = 0.0f;
        enabled = true;
	}

    /// <summary>
    /// Loop over all cached materials and update their color, disable self if we reach our target color.
    /// </summary>
    protected void Update()
	{
		_currentColor = Color.Lerp(_currentColor, _targetColor, Time.deltaTime * LerpFactor);

		for (int i = 0; i < _materials.Count; i++)
		{
			_materials[i].SetColor("_GlowColor", _currentColor);
		}

		if (_currentColor.Equals(_targetColor))
		{
			enabled = false;
		}
	}
}