For a beautiful visual explanation, see Toby Schachman&#x27;s Shadershop videos: <a href="http:&#x2F;&#x2F;tobyschachman.com&#x2F;Shadershop&#x2F;" rel="nofollow">http:&#x2F;&#x2F;tobyschachman.com&#x2F;Shadershop&#x2F;</a>