I wrote a short tutorial (6 pages in total) about speed thumbnail rendering using ArtRage markers. Writing tutorials is a good way for memorizing things -- especially concerning software. I hope you can find it interesting and useful!
IMPORTANT : If you want to share it with someone please link them to this post and not directly to the PDF : I'll update and fix the PDF from time to time and the various releases will be available here on this post with an updated filename, while the old ones will be removed from the server!
Download the article PDF [2,77MB] (latest update : 09th May 2010)
