Well, ha ha! It occurs to me that I dont know what a vertice is!
http://www.mediafire.com/imageview.php?quickkey=01ftmszvgzm&thumb=4
But heres an image, possibly better explaining what I mean (you may have to make sure you are viewing the image full size)
I know that the Doom3 engine allowed things to be ultimately snapped onto a 0.125x0.125 grid...
I assume, I suppose, that things have to be on grid. I dont really know.
It would just certainly explain a lot of the problems and issues I have run into while mapping. But I do strive to understand it better, so please, explain...