How can I change current cmake generator without using Cmake GUI (I want to change standart generator to Visual Studio 12 2013 Win64)?
You cannot reliably change the generator used for an output (= binary) directory once generation has already happened there once. You should start in a fresh output directory.
Once there, simply use CMake's
-G command-line option:
cmake -G "Visual Studio 12 2013 Win64"