This book aims at guiding he who uses AutoCAD on a daily basis in becoming a true expert. That kind of AutoCAD expert that is acquainted with, understands and can manipulate the programa??s inner workings to achieve the desired output in a fast and efficient way. That expert who is not satisfied with what comes out of the box, but demands more. Like automating the creation and shaping of 3D objects, whether 3DSolids, subdivision meshes, associative or NURBS surfaces and setting the points of view and visualization modes that help in understanding the generated models. To these and other advanced techniques, including parameterization, reactors, the graphical user interface and building applications, more than half of this book is dedicated. For this we use Visual LISP, the tool of choice to customize and extend AutoCADa??s features, be it by its capabilities as a basic scripting language to automate repetitive tasks or taking advantage of advanced drawing database access...