title: In computer graphics, what's the difference between a UVW mapping and a UV mapping?
body: <p>In working with textures, does "UVW mapping" mean the same thing as "UV mapping"?<br>
  If so why are there two terms, and what is the "W"?
  If not, what's the difference between them?  </p>
  
  <p>[Wikipedia currently isn't illuminating on this question: <a href="http://en.wikipedia.org/wiki/Talk:UVW_mapping" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Talk:UVW_mapping</a>]</p>