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Item Using Sketches and Retrieval to Create LEGO Models(The Eurographics Association, 2008) Santos, Tiago; Ferreira, Alfredo; Dias, Filipe; Fonseca, Manuel J.; Christine Alvarado and Marie-Paule CaniIn this paper we describe a system to create LEGO models using sketches. Although there are a few applications to create LEGO models, they are difficult to use, mainly due to the searching and manipulation mechanisms that they (do not) offer. Here, we propose a sketch based approach, where users can easily insert parts, by specifying their dimensions through sketches and the system suggests a list of possible parts. To help with the modeling and the manipulation we also developed a constraint based mechanism, which keeps parts connected, performs snapto- grid and detects collisions. Experimental tests with users revealed that our approach is easier and faster to use than a conventional application, such as LeoCAD.