Sketchup Tutorial
Unwrap and Flatten Faces Plugin for Sketchup
Alex Schreyer, is the developer of Unwrap and Flatten Faces plugin for sketchup.The most updated version of this sketchup plugin is V2.0. Unwrap and Flatten Faces plugin supports SketchUp 8, SketchUp 2013, SketchUp 2014 and SketchUp 2015.
The plugin is available in sketchup extension warehouse, alternatively you can download it from this link.( www.alexschreyer.net/projects/flatten-faces-plugin)