FUNCTIONALITY: it welds vertices (moves them to one spot and tries to weld colinear edges) selected by a 'fence' (thx to whaat for lot of lines of code)
USAGE NOTE: select all geometry you want to weld prior to launching the script, then choose the vertices to weld by drawing a virtual 'fence'
NOTE 4 RUBY CODERS: script is pretty dirty but the main part is useful for selecting vertices in view - feel free to use itlicence: your only duty is to share any improvements and/or upgrades of this code under this same condition
thanks to Juan V Soler
for inspiration to make thisHistory12.04.2008 v1.2now it lets you specify your welding spot by cycling through all possible positions
Plugins/Vertex Weld (From Selection) -> Weld with Feedback
specify weld region with your mouse
cycling LEFT / RIGHT ARROW