SAFE: Structure-aware Facade Editing

Figure 1: Structure-aware facade editing. Using the notion of generalized grids, our system encodes various symmetry, align-ment, and hierarchy relations among the elements of a facade. During incremental editing, the user can specify different grids (shown as box abstractions) for which our system proposes new configurations. Editing progresses by selecting such grids and one of the proposed configurations (shown in red). Many man-made objects, in particular building facades, exhibit dominant structural relations such as symmetry and regularity. When editing these shapes, a common objective is to preserve these relations. However, often there are numerous plausible editing results that all preserve the desired structural relations of the input, creating ambiguity. We propose an interactive facade editing framework that explores this structural ambiguity. We first analyze the input in a semi-automatic manner to detect different groupings of the facade elements and the relations among them. We then provide an incremental editing process where a set of variations that preserve the detected relations in a particular grouping are generated at each step. Starting from one input example, our system can quickly generate various facade configurations