get both degrees..Will Not require much more effort.If you have spare cells then learn accounting also as only that will last much longer.

yes,you got it right.I also know how to do some vc++(the old c++ not the new one with lambda,..).I know vb.net ok and also c++. I have asked a friend to help me in command line and probably when i show him my face next we will have a c++ program which readpolygons,readpoygons, perform union, write result polygons no graphics....so sad... ps:i have got 1 more library, in c of the previous decades.

no it is in delphi/c++ and gpc is in c++.I dont a demo program to use the libraries under vs2010..that is the problem.both use a algorithm called vattis algorithm in computational Geometry. in vs2010 /c++(unmanaged) i dont know how to do graphics .

yes, i want to merge the regions and just get the outer contour. As simple as that and I have to use clipper?.(it is in borland delphi/c++)

oh dear, what i meant was I want a program which takes a group of input simple polygons and merges them with the 2nd group of simple polygons. I have located 2 libraries (both use vatti's) algorithm for clipping. My polygons are without hoes,not self intersecting and only graze at edges(if at all). I want to merge them to get the outer contour of the final merged polygon. I presume that would be easier to do then the clip in the 2 heavy libraries.

I have located fast libraries for unions of 2 polygons.Now, how does one merge a group of simple polygons.