Static 3D Triangle Mesh Compression Overview

3D triangle meshes are extremely used to model discrete surfaces, and almost always represented with two tables: one for geometry and another for connectivity. While the raw size of a triangle mesh is of around 200 bits per vertex, by coding cleverly (and separately) those two distinct kinds of information it is possible to achieve compression ratios of 15:1 or more. Different techniques must be used depending on whether single-rate vs. progressive bitstreams are sought; and, in the latter case, on whether or not hierarchically nested meshes are desirable during reconstructio

Multi-Resolution Texture Coding for Multi-Resolution 3D Meshes

We present an innovative system to encode and transmit textured multi-resolution 3D meshes in a progressive way, with no need to send several texture images, one for each mesh LOD (Level Of Detail). All texture LODs are created from the finest one (associated to the finest mesh), but can be re- constructed progressively from the coarsest thanks to refinement images calculated in the encoding process, and transmitted only if needed. This allows us to adjust the LOD/quality of both 3D mesh and texture according to the rendering power of the device that will display them, and to the network capacity. Additionally, we achieve big savings in data transmission by avoiding altogether texture coordinates, which are generated automatically thanks to an unwrapping system agreed upon by both encoder and decoder

Minimal 3-loop neutrino mass models and charged lepton flavor violation

We study charged lepton flavor violation for the three most popular 3-loop Majorana neutrino mass models. We call these models "minimal" since their particle content correspond to the minimal sets for which genuine 3-loop models can be constructed. In all the three minimal models the neutrino mass matrix is proportional to some powers of Standard Model lepton masses, providing additional suppression factors on top of the expected loop suppression. To correctly explain neutrino masses, therefore large Yukawa couplings are needed in these models. We calculate charged lepton flavor violating observables and find that the three minimal models survive the current constraints only in very narrow regions of their parameter spaces.Comment: 32+7 pages, 23 figures, 7 table

ITEM: Inter-Texture Error Measurement for 3D Meshes

We introduce a simple and innovative method to compare any two texture maps, regardless of their sizes, aspect ratios, or even masks, as long as they are both meant to be mapped onto the same 3D mesh. Our system is based on a zero-distortion 3D mesh unwrapping technique which compares two new adapted texture atlases with the same mask but different texel colors, and whose every texel covers the same area in 3D. Once these adapted atlases are created, we measure their difference with ITEM-RMSE, a slightly modified version of the standard RMSE defined for images. ITEM-RMSE is more meaningful and reliable than RMSE because it only takes into account the texels inside the mask, since they are the only ones that will actually be used during rendering. Our method is not only very useful to compare the space efficiency of different texture atlas generation algorithms, but also to quantify texture loss in compression schemes for multi-resolution textured 3D meshes

Plebe y revolución : la participación popular durante las guerras de independencia en el Perú, 1808-1824

Actualmente una de las variantes historiográficas más importantes en el estudio de la independencia en América Latina está circunscrita al análisis de la participación política de los grupos populares. En ese sentido, en aquel contexto de guerra y lucha revolucionaria en el Perú, que va desde la crisis hispana de 1808 hasta la independencia definitiva en 1824, esta investigación, a partir de un conjunto de fuentes de archivo, impresos y periódicos diversos, desarrolla las imágenes y representaciones que las elites peruanas construyeron de estos sectores sociales, algunas de las respuestas que estos últimos les infringieron y las múltiples alternativas políticas, que en aquel escenario beligerante, todos estos actores supieron concebir, negociar y utilizar políticamente.One of the most important historiographic variants in the study of independence in Latin America is currently limited to the analysis of political participation of the popular groups. In this regard, in the context of war and revolutionary struggle in the Peru, which runs from the Spanish crisis of 1808 to definitive independence in 1824, this research, from a set of sources for file, print, and various newspapers, develops images and representations to the Peruvian elite built these social sectors, some of the responses that these past infringed them and multiple policy alternatives, that all these players knew how to design, negotiate and use politically that belligerent onstage.Fil: Morán, Daniel. Consejo Nacional de Investigaciones Científicas y Técnica