PublicationsGirona
ViRVIG
Gen3dlife Journals Results
Diego Jesus; Patow, Gustavo A.; António Coelho; António Augusto Sousa
Computers & Graphics, Vol. 72, pp 106-121, 2018.
DOI: http://dx.doi.org/10.1016/j.cag.2018.02.003
Procedural modeling techniques reduce the effort of creating large virtual cities. However, current methodologies do not allow direct user control over the generated models. Associated with this problem, we face the additional problem related to intrinsic ambiguity existing in user selections. In this paper, we propose to address this problem by using a genetic algorithm to generalize user-provided point-and-click selections of building elements. From a few user-selected elements, the system infers new sets of elements that potentially correspond to the user’s intention, including the ones manually selected. These sets are obtained by queries over the shape trees generated by the procedural rules, thus exploiting shape semantics, hierarchy and geometric properties. Our system also provides a complete selection-action paradigm that allows users to edit procedurally generated buildings without necessarily explicitly writing queries. The pairs of user selections and procedural operations (the actions) are stored in a tree-like structure, which is easily evaluated. Results show that the selection inference is capable of generating sets of shapes that closely match the user intention and queries are able to perform complex selections that would be difficult to achieve in other systems. User studies confirm this result.
Gen3dlife Conferences Results
LeoMCAD: A Lego-based Mechanical CAD system
Gonzalez, Francisco; Jesús Amador Pérez; Patow, Gustavo A.
Spanish Computer Graphics Conference (CEIG), 2018.
DOI: http://dx.doi.org/10.2312/ceig.20181163
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Mechanical Design (MCAD) tools are used for creating 3D digital prototypes used in the design, visualization, and simulation of products. In this paper we present LeoMCAD, a Lego-based mechanical system designed to be used as an education tool both for kids and Lego hobbyists; but which features a novel solver that naturally and seamlessly computes the interaction between the pieces that build-up a given model, solving an otherwise complex forward kinematic system of equations in a much simpler way. The results show how our system is able to cope with situations that would produce dead-lock situations in more advanced commercial systems.
3D4life PhD Thesis Results