Yes, surface direction is important for things like merging verts, boolean operations and pretty much all the same reasons as Lightwave. To turn off two-sided lighting press the lighting drop down and uncheck two-sided lighting. I do this as a matter of habit whenever I start modeling as it can be tricky to figure out why some operations fail because of incorrect surface directions.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 21-03-2012 at 03:52 AM.