Papers by Juan Alberto Jiménez Torres
Computers & Graphics, 2005
Space-Partition Octree (SP-Octree) is a hierarchical representation scheme for solid modelling. I... more Space-Partition Octree (SP-Octree) is a hierarchical representation scheme for solid modelling. It allows a multiresolution representation of polyhedral objects, and has been successfully used in progressive transmission. Moreover, this scheme allows visualising the model in an adaptive way. However, at intermediate levels of the SP-Octree, the obtained visualisation is a rough approximation of the object due to the fact that grey nodes are approximated by the face's planes belonging to the convex hull of the solid included in that node. In this paper, we present an approach that improves the visualisation of these multiresolution SP-Octrees models by applying impostors over those planes that are not part of the solid boundary. This way, it is possible to obtain a more realistic visualisation of the object, although the maximum LOD is not used. At each moment, the impostor is selected depending on the observer's viewpoint. Each SP-Octree has associated a set of impostors that are views of the modelled complex solid.
International Journal of Creative Interfaces and Computer Graphics, 2012
Considerable efforts have been done to produce realistic results when simulating interaction with... more Considerable efforts have been done to produce realistic results when simulating interaction with elastic materials. Many applications such as surgery planning, medical training, or virtual sculpting would benefit from a plausible simulation scenario. However, even though many works have proposed very satisfactory results, realistic simulation of deformable bodies is still an open issue. One of the challenges when designing a realistic elastic body simulation is the huge amount of data that needs to be processed. For the inner properties of the material are crucial when it comes to reproduce the elastic problem, the simulation naturally calls for volumetric information. In this paper the authors propose a technique to interactively deform 3D images, such as those acquired by a CT scanner. While producing a physically plausible haptic feedback, deformation and visualization algorithms produce an efficient and natural feeling. Using a free form deformation structure as a wrapper, it i...
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Papers by Juan Alberto Jiménez Torres