Method isInvisibleToPlayer

src/main/java/net/minecraft/entity/Entity.java:2243–2246

Only used by renderer in EntityLivingBase subclasses. Determines if an entity is visible or not to a specfic player, if the entity is normally invisible. For EntityLivingBase subclasses, returning false when invisible will render the entity semitransparent.

(EntityPlayer player)

     * For EntityLivingBase subclasses, returning false when invisible will render the entity semitransparent.
     */
    public boolean isInvisibleToPlayer(EntityPlayer player)
    {
        return player.isSpectator() ? false : this.isInvisible();
    }

    public void setInvisible(boolean invisible)
    {