I've been (practicing > messing around) with various timewarp modes from 'Duplicated Field' to 'Fluidmotion' over the past week and have become intrigued by the tab next to the fluidmotion setting. Clicking the tab introduces a range of options that presents more questions than I can find answers for. I guess these fluidmotion options may be there to help in the removal of artifacts, that can occur, due to using fluidmotion in scenes featuring detailed backgrounds. These artifacts can be seen in this YouTube video.
https://www.youtube.com/watch?v=KJFKHhlv27s
I'm guessing, that as some of the controls look similar to those available in effects like the paint effect, the aim would be to mask, paint over or minimise the areas with the artifacts.
A quick search of this site comes up with these posts but they don't really address my curiousity.
http://community.avid.com/search/SearchResults.aspx?q=fluidmotion+effect
Are there any details on how and in what circumstances these additional fluidmotion tools could be used?