User-Friendly Graph Editing for Procedural Modeling of Buildings

A proposed rule-based editing metaphor intuitively lets artists create buildings without changing their workflow. It´s based on the realization that the rule base represents a directed acyclic graph and on a shift in the development paradigm from product-based to rule-based representations. Users can visually add or edit rules, connect them to control the workflow, and easily create commands that expand the artist´s toolbox (for example, Boolean operations or local controlling operators). This approach opens new possibilities, from model verification to model editing through graph rewriting.