Riu, AdriaPatow, GustavoIsabel Navazo and Gustavo Patow2013-11-082013-11-082012978-3-905673-92-0https://doi.org/10.2312/LocalChapterEvents/CEIG/CEIG12/067-075This paper presents a new system to add direct and persistent local control to the visual editing of rules for procedural buildings, avoiding a combinatorial explosion of grammar rules. In this paper we follow the ideas initially proposed by Lipp and co-workers [LWW08]. For this, we have added a few simple new commands, which are added to the artist-provided ruleset in a way completely transparent to the user. The end-user selects the primitives/assets to modify, and the system automatically incorporates these modifications into the ruleset. This change is performed using graph-rewriting techniques, which are both simple to define and control, but also very powerful and practical for these situations.I.3.6 [Computer Graphics]Computer GraphicsLanguagesI.3.5 [Computer Graphics]Computer GraphicsComputational Geometry and Object ModelingI.3.5 [Computer Graphics]Computer GraphicsThree Dimensional Graphics and Realism