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Well after a week of effort and prowling the vast information provided by others I was finally able to build openCV 3.0 Beta with Python 3.4.3 with 64 bit versions directly from the Python & openCV sites

My environment is Windows 7 w/ SP1, CMake 3.2.1 and VS2012.

Tips: Not anyone post was found to be 100% accurate and/or match my specific setup - of course. Most confusing was that even though using VS2012: I had to reference VS 2011 2012 Win64 as the compiler in Cmake. I think this enables using the correct Platform Toolset VS 2012 (v110) in the VS setup for the openCV build. Also I had to ref my python3 dirs instead of python2 dirs in CMakes python2 variables definitions or else it would always be built with Python2 for the openCV build even though I had python3 variables defined too. I copied my resulting /install/.. dirs from my target dir for the build over to my Beta3.0\opencv dir. This becomes the pathway dir to ref in VS2012 for subsequent project builds i.e. Additional Include dirs & Additional Library dirs

Well after a week of effort and prowling the vast information provided by others I was finally able to build openCV 3.0 Beta with Python 3.4.3 with 64 bit versions directly from the Python & openCV sites

My environment is Windows 7 w/ SP1, CMake 3.2.1 and VS2012.

Tips: Not anyone post was found to be 100% accurate and/or match my specific setup - of course. Most confusing was that even though using VS2012: I had to reference VS 2011 2012 Win64 as the compiler in Cmake. I think this enables using the correct Platform Toolset VS 2012 (v110) in the VS setup for the openCV build. Also I had to ref my python3 dirs instead of python2 dirs in CMakes python2 variables definitions or else it would always be built with Python2 for the openCV build even though I had python3 variables defined too. I copied my resulting /install/.. dirs from my target dir for the build over to my Beta3.0\opencv dir. This becomes the pathway dir to ref in VS2012 for subsequent project builds i.e. Additional Include dirs & Additional Library dirs

Obviously I am a Newbie with much to learn!