{"id":59081,"date":"2018-03-09T22:46:56","date_gmt":"2018-03-09T22:46:56","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/nuevas-estrategias-de-occlusion-culling-en-entornos-complejos-y-compactos\/"},"modified":"2018-03-09T22:46:56","modified_gmt":"2018-03-09T22:46:56","slug":"nuevas-estrategias-de-occlusion-culling-en-entornos-complejos-y-compactos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sistemas-en-tiempo-real\/nuevas-estrategias-de-occlusion-culling-en-entornos-complejos-y-compactos\/","title":{"rendered":"Nuevas estrategias de occlusion culling en entornos complejos y compactos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ignacio Mar\u00eda Mansa Othaitz <\/strong><\/h2>\n<p>Nuevas estrategias de occlusion culling en entornos complejos y compactos. los entornos virtuales cada vez son m\u00e1s complejos con m\u00e1s elementos y mayor detalle geom\u00e9trico. Esta complejidad con lleva un mayor coste computacional para su representaci\u00f3n. Adem\u00e1s la visualizaci\u00f3n incluye efectos m\u00e1s realistas lo que dificulta realizar simulaciones en tiempo real. En este trabajo se describen algoritmos para visualizaci\u00f3n monosc\u00f3pica y esterosc\u00f3pica capaces de obtener un buen rendimiento en condiciones de dibujado  exigentes. El estudio realizado determina la visibilidad de los elementos que componen la escena con el objetivo de acelerar la visualizaci\u00f3n. Para determinar la visibilidad  se utilizan  consultas de oclusi\u00f3n por hardware. Los algoritmos planteados se aplicasen en escenas complejas, compactas y no densamente ocultas. En estas escenas el porcentaje de elementos  ocultos no es grande, en las zonas m\u00e1s criticas ronda el 30 %. Por esta raz\u00f3n, los algoritmos debe ser simples para no invertir m\u00e1s tiempo en determinar la visibilidad de los objetivos que en dibujarlos directamente. La eficiencia de los algoritmos propuestos se basa en varios factores. En primer lugar, los objetos visibles de ordenan para que las consultas de oclusi\u00f3n reduzcan los casos de falsos positivos. Adem\u00e1s, se utiliza una geometr\u00eda apropiada para las consultas  de oclusi\u00f3n. Por \u00faltimo, se puede utilizar una estrategia agresiva de coherencia temporal para mejorar la frecuencia de dibujado. La mayor contribuci\u00f3n de este trabajo consiste en la proposici\u00f3n de un nuevo par\u00e1metro de oclusi\u00f3n que acelera la visualizaci\u00f3n de entornos complejos. Esta informaci\u00f3n sirve para conocer la relevancia de cada objeto en la imagen y de esta forma representar al objeto con menor detalle. Mediante este par\u00e1metro se aumenta muy notablemente el rendimiento de la visualizaci\u00f3n.  virtual environments become more complex with more elements and greater geometric detail. This complexity entails a greater computational cost for its  representation. In addition, the visualization includes more realistic effects that make difficult real time simulations. In this work, algorithms for monoscopic and stereoscopic visualization are described. These algorithms reach good performances even in a more demanding rendering condition. The algorithms determine the visibility of objects with hardware occlusion queries in order to accelerate the visualization. The research deals with complex and compact scenes where the percentage of occluded elements is not great. Therefore, the algorithms must be fast and simple to do not spend more time in determining the visibility of the objects than in drawing them directly. The efficiency of the proposed algorithms is based on several factors. Firstly, visible objects are sorted so occlusion queries can reduce false positives results. Next, an appropriate geometry is used in occlusion queries. And finally, an aggressive strategy of temporal coherence may be used to improve performance. The major contribution of this work consists of a new  parameter of occlusion that improves the visualization of complex environments. This information is used to assess the relevance of each object in the image this parameter increases remarkably the frame rate.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Nuevas estrategias de occlusion culling en entornos complejos y compactos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Nuevas estrategias de occlusion culling en entornos complejos y compactos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ignacio Mar\u00eda Mansa Othaitz <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 15\/06\/2007<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Aiert Amundarain Irizar<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Francisco javier Cuadrado aranda <\/li>\n<li>Javier Lluch crespo (vocal)<\/li>\n<li>Francisco ramon Feito higueruela (vocal)<\/li>\n<li>alejo Avello iturriagagoitia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ignacio Mar\u00eda Mansa Othaitz Nuevas estrategias de occlusion culling en entornos complejos y compactos. los entornos virtuales 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