Easy to modify and add some parameters. Download: http://doctrina-kharkov.blogspot.com/2018/08/unity-glass-shader.html
Found a Wayback link here: http://web.archive.org/web/20200221....blogspot.com/2018/08/unity-glass-shader.html Direct link to the Project files: https://www.dropbox.com/s/iqz7mbx9l2wlhah/Doctrina-Glass-Shader.zip?dl=0 It's a Unity 5.6 project, so stuff may be outdated and no longer working in more recent Unity versions. .