public virtual void OnCollisionEnter2D(Collision2D coll)
{
// If a character enters the area, decrease alpha if it is only the first character
CharacterMove character = coll.transform.GetComponent<CharacterMove>();
if (character != null)
{
numChar++;
if (numChar == 1)
{
myRenderer.color = new Color(1f, 1f, 1f, .5f);
}
}
}