ReMESH: An interactive and user-friendly environment for remeshing surface triangulations

Research and software development involving geometry processing are often slowed down by the absence of suitable models for testing and benchmark purposes. In particular, when dealing with triangle meshes, a researcher may need to check the behavior of a new algorithm on several particular cases. In most situations, the test model is easily conceivable in mind but, at actual design time, its formalization turns out to be a much harder task than expected. Also, simple modifications over an existing triangle mesh may become a tedious work without a suitable interactive environment. In order to simplify the remeshing of existing models, we have developed a tool to interactively edit manifold triangle meshes, mostly through user friendly actions such as mouse clicks and drags

From 3D Models to 3D Prints: an Overview of the Processing Pipeline

Due to the wide diffusion of 3D printing technologies, geometric algorithms for Additive Manufacturing are being invented at an impressive speed. Each single step, in particular along the Process Planning pipeline, can now count on dozens of methods that prepare the 3D model for fabrication, while analysing and optimizing geometry and machine instructions for various objectives. This report provides a classification of this huge state of the art, and elicits the relation between each single algorithm and a list of desirable objectives during Process Planning. The objectives themselves are listed and discussed, along with possible needs for tradeoffs. Additive Manufacturing technologies are broadly categorized to explicitly relate classes of devices and supported features. Finally, this report offers an analysis of the state of the art while discussing open and challenging problems from both an academic and an industrial perspective.Comment: European Union (EU); Horizon 2020; H2020-FoF-2015; RIA - Research and Innovation action; Grant agreement N. 68044

A new method for simplification and compression of 3D meshes

We focus on the lossy compression of manifold triangle meshes. Our SwingWrapper approach partitions the surface of an original mesh M into simply-connected regions, called triangloids. We compute a new mesh M\u27. Each triangle of M\u27 is a close approximation of a pseudo-triangle of M. By construction, the connectivity of M\u27 is fairly regular and can be compressed to less than a bit per triangle using EdgeBreaker or one of the other recently developed schemes. The locations of the vertices of M\u27 are compactly encoded with our new prediction scheme, which uses a single correction parameter per vertex. For example, a variety of popular models retiled with our approach yield 10 times fewer triangles without exceeding an error of 1% of the radius of the bounding ball. Vertices of M\u27 are encoded with an average of 6 bits, which results in a total storage of 0.4 bits per triangle of the original mesh. The proposed solution may also be used to encode crude meshes for adaptive transmission and for controlling subdivision surfaces

Normal Umbrella: A new primitive for triangulating parametric surfaces

Typical methods for the triangulation of parametric surfaces use a sampling of the parameter space, and the wrong choice of parameterization can spoil a triangulation or even cause the algorithm to fail. We present a new method that uses a local tessellation primitive for almost-uniformly sampling and triangulating a surface, so that its parameterization becomes irrelevant. If sampling density or triangle shape has to be adaptive, the uniform mesh can be used either as an initial coarse mesh for a refinement process, or as a fine mesh to be reduced

Mucosa associated lymphoid tissue lymphoma of the thyroid gland: a case report and literature review = MALT linfoma della tiroide: caso clinico e revisione della letteratura

Mucosa associated lymphoid tissue (MALT) lymphomas are low-grade, non-Hodgkin’s B cell lymphomas, mainly occurring in the gastrointestinal tract, but also in other tissues. We describe the management of a patient with hypothyroidism, tracheoesophageal compressive symptoms and chest tightness affected by a thyroid MALT lymphoma. The patient underwent debulking thyroidectomy and temporary tracheostomy in order to reduce dysphonia and dysphagia, followed by adjuvant chemotherapy and subsequently radiation therapy. A CT scan performed at the end of radiotherapy 6 months after surgery revealed remnants of residual tissue from the thyroidectomy without any pathological findings. I linfomi MALT sono dei linfomi non-Hodgkin a cellule B a basso grado che in genere insorgono a livello del tratto gastrointestinale, ma anche in altri tessuti. Descriviamo in questo articolo il management clinico-chirurgico di un paziente con ipotiroidismo, sintomi da compressione tracheo-esofagea e senso di oppressione toracica, affetto da linfoma MALT della tiroide. Il paziente è stato sottoposto a parziale asportazione della massa tiroidea e tracheostomia allo scopo di ridurre i sintomi compressivi ed in seguito a trattamento chemioterapico e radioterapico. L’esame TC effettuato una volta conclusa la radioterapia, circa 6 mesi dopo l’intervento, ha evidenziato gli esiti della tiroidectomia parziale in assenza di altri reperti patologici

Aspetti di tecnica colturale del cartamo (<i>Carthamus tinctorius</i> L.)

During 1981, 1982 and 1983 trials have bean carried out on different varietas of safflower. The trials con· cerned the sowing rates, row spacing and N fertilization. The varietas Safflola 202, Safflola 541 and Safflola 918 have given the highest yield achieving 20 q ha-1 . Achenes yield hasn't been statistically different using 20-30 and 40 Kg ha -1 of seed. Yield rates nearly equal have been obtained with plants in narrow rows (25 cm) and in wide rows (50 cm). N fertilization has positively affected the achenes-yield. 40 Kg ha -1 of N have determined an increased production wich has been statistically significant in comparison with the non fertilized test. It hasn't been achieved any further increment in the yield using higher N rates (80 and 120 Kg ha-1)

SHREC08 Entry: Report of the Stability Track on Watertight Models

In this report we present the results of the Stability on Watertight Models Track. The aim of this track is to evaluate the stability of algorithms with respect to input perturbations that modify the representation of the object without changing its overall shape significantly. Examples of these perturbations include geometric noise, varying sampling patterns, small shape deformations and topological noise

How Climate Effects the Tick Vector of Lyme Disease: A Critical and Systematic Review of the Literature

Background Lyme disease (LD) is a common vector-borne disease in North America. Understanding the causes behind inter-annual fluctuations of LD incidence can help warn healthcare providers of upcoming outbreaks. Objective Identifying what specific climate variables affects the vector, Ixodes scapularis ticks, and ultimately LD incidence. Methods A systematic review was carried out to understand how climate variables affect the tick population variables that are related to LD. Results Twenty-one studies met the inclusion criteria. Risk of bias was generally rated “low” or “probably low” and quality of evidence was rated “moderate”. Strength of evidence was assessed for tick abundance, a proxy for LD. The relationship with climatic moisture was rated as “sufficient”, but was rated “inadequate” for temperature and temperature+moisture. A positive, moderate-strong relationship between prior climatic moisture and tick abundance (r=0.82; r2=0.56–0.64) was observed in 50% of studies. The relationship was observed in 75% of nymph-only abundance studies. While relationships were observed between tick abundance and temperature (70% of studies, r=(-0.89)–0.93; r2=(-0.56)–0.34) and temperature+moisture (38% of studies, 75% negative relationships), direction and magnitude could not be determined. Conclusion Higher climatic moisture (yearly or 0.5–2 years prior) increases tick abundance and, by proxy, LD incidence. Nymph-only abundance studies, a more accurate proxy, was more likely to show this relationship. Climate change is predicted to increase precipitation in Northeast US/Canada, which appears likely to increase LD incidence