Aiert Amundarain

A large haptic device for aircraft engine maintainability

The virtual reality for maintainability (Revima) VR system supports maintainability simulation in aeronautics. Within this project we have developed and integrated a haptic device, the large haptic interface for aeronautic maintainability (LHIfAM). We use this device to track hand movements and provide force feedback within the large geometric models that describe aircraft engines. The user movements are the same as those that occur when testing physical mock-ups. An integrated haptic device and VR system for testing aircraft engines reduces development costs and avoids the necessity of physical mock-ups formaintainability.

Hybrid Visualization for Maxillofacial Surgery Planning and Simulation

Currently, many visualization methods are used in computer assisted medicine. It is commonly considered that a unique visualization scheme makes difficult the interaction and limits the quality and quantity of the information shown. In this paper we study the specific requirements of a maxillofacial surgery simulation tool for facial appearance prediction. The different stages of the application lead to present medical information in different ways. We propose to adapt visualization techniques to give a more suitable answer to these needs: a hybrid volumetric and polygonal visualization for the planning stage, as well as a scheme for surgery definition in 2D. Finally, we propose the use of mesh visualization for the simulated model, which previously requires the 3D reconstruction of the surface in order to be visualized.

Towards Adaptive Occlusion Culling Using Camera Coherence

Occlusion culling proves to be useful for the interactive visualization of environments that are not densely occluded. Those which are built up by dense geometric sets like aerospace engines composed of thousands of components and millions of polygons. In first place the convenience of using occlusion culling is studied with a simple scheme. Then improvements are analyzed. The key points to obtain frame rate speed-ups are: a convenient occlusion query scheduling provides the performance required; depth sorting is performed only when camera orientation changes more than a given threshold; coherence reduces the number of occlusion queries posted per frame. It is possible to select the percentage of occlusion queries that will be performed in each frame, from non-conservative schemes up to a conservative one. Furthermore, we propose a small addition to the GPU occlusion queries to perform faster renderings

Proyección Esférica Usando la Programación en la GPU

Existen una gran cantidad de dispositivos de visualización que se emplean en los sistemas de realidad virtual; desde dispositivos de pantalla plana hasta sistemas que ofrecen una sensación de inmersión completa. Entre estos sistemas se puede encontrar los sistemas de proyección esférica, que presentan un buen grado de inmersión. Sin embargo, el tipo de proyección necesario para este tipo de sistemas no está soportado directamente por el hardware gráfico actual. Las mejoras en la programabilidad de este tipo de hardware permiten implementar los métodos necesarios para usar sistemas de proyección esférica de forma efectiva. En este artículo se describe un método para implementar las proyecciones necesarias en este tipo de sistemas usando el hardware gráfico. Así mismo, se presentan mejoras y métodos que permiten mejorar la eficiencia del método y la calidad de las imágenes obtenidas. Categorías y descriptores de tema (según ACM CCS): I.3.3 [Gráficos por ordenador]: Algorítmos de Visualización I.3.7 [Gráficos por ordenador]: Realidad Virtual