There is a very nice article about the UDIM UV mapping method written by Mike Seymour. Mike starts with a describtion about Ptex and it's characteristics. Later then you will learn how UDIM works and where it was used the first time.
UDIM was invented by Richard Addison-Wood who is a software developer at Weta Digital.
Here is the complete article: http://www.fxguide.com/featured/udim-uv-mapping/
Have fun
Chris
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