In Rigids IV, we're going to use Houdini 16's new Boolean SOP to learn how to fracture and subfracture (and sub-subfracture!) a large chunk of terrain that we'll make from scratch. We'll learn how to make a powerful workflow to surround this new production studio-class fracturing tool, as just knowing how to do the fracture is not enough. We will need to make every step of the way completely art directable, as well as efficient to create, to cache, to simulate, and to render. Along the way we will learn more scripting techniques, simulation tricks, and production tested tips in order to arrive at our exciting result!