Examinando por Materia "WebGL (Web Graphics Library)"
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Ítem Advanced HCI and 3D Web over Low performance Devices(2012-07) Oyarzun, David; Del Pozo, Arantza; Congote, John Edgar; Olaizola, Igor G.; Sainz, Iñaki; Leturia, Igor; Arregi, Xabier; Ruíz, Óscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis position paper presents the authors’ goals on advanced human computer interaction and 3D Web -- Previous work on speech, natural language processing and visual technologies has achieved the development of the BerbaTek language learning demonstrator, a 3D virtual tutor that supports Basque language students through spoken interaction -- Next steps consist on migrating all the system to multidevice web technologies -- This paper shows the architecture defined and the steps to be performed in the next monthsÍtem Hardware-accelerated Web Visualization of Vector Fields. Case Study in Oceanic Currents(2012) Aristizábal, Mauricio; Congote, John Edgar; Segura, Álvaro; Moreno, Aitor; Arregui, Harbil; Ruíz, O.Visualization of vector fields plays an important role in research activities nowadays -- Increasing web applications allow a fast, multi-platform and multi-device access to data -- As a result, web applications must be optimized in order to be performed heterogeneously as well as on high-performance as on low capacity devices -- This paper presents a hardware-accelerated scheme for integration-based flow visualization techniques, based on a hierarchical integration procedure which reduces the computational effort of the algorithm from linear to logarithmic, compared to serial integration methodologies -- The contribution relies on the fact that the optimization is only implemented using the graphics application programming interface (API), instead of requiring additional APIs or plug-ins -- This is achieved by using images as data storing elements instead of graphical information matrices -- A case study in oceanic currents is implementedÍtem Interactive visualization of volumetric data with WebGL in real-time(ACM, 2011-06) Congote, John; Kabongo, Luis; Moreno, Aitor; Segura, Alvaro; Posada, Jorge; Ruíz, Oscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis article presents and discusses the implementation of a volume rendering system for the Web, which articulates a large portion of the rendering task in the client machine -- By placing the rendering emphasis in the local client, our system takes advantage of its power, while at the same time eliminates processing from unreliable bottlenecks (e.g. network) -- The system developed articulates in efficient manner the capabilities of the recently released WebGL standard, which makes available the accelerated graphic pipeline (formerly unusable) -- The dependency on specially customized hardware is eliminated, and yet efficient rendering rates are achieved -- The Web increasingly competes against desktop applications in many scenarios, but the graphical demands of some of the applications (e.g. interactive scientific visualization by volume rendering), have impeded their successful settlement in Web scenarios -- Performance, scalability, accuracy, security are some of the many challenges that must be solved before visualWeb applications popularize -- In this publication we discuss both performance and scalability of the volume rendering by WebGL ray-casting in two different but challenging application domains: medical imaging and radar meteorologyÍtem MEDX3DOM: MEDX3D for X3DOM(ACM, 2012-08) Congote, John; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEWe present an implementation of MEDX3DOM a MEDX3D standard implemented into the X3DOM framework -- We present the report of a work in progress of the implementation identifying the critical sections to be migrated into the new architecture, and possible extensions of the standard on the Web environment -- Results for the early implementation are shown, where the visualization of medical datasets with advanced direct volume rendering algorithms are obtained under the X3DOM architecture with interactive frame rates and good image quality -- An example of the HTML5/X3DOM document is presented with futureÍtem Real-time volume rendering and tractography visualization on the web(2012) Congote, John; Novo, Esther; Kabongo, Luis; Ginsburg, Dan; Gerhard, Stephan; Pienaar, Rudolph; Ruíz, Óscar E.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEIn the field of computer graphics, Volume Rendering techniques allow the visualization of 3D datasets, and specifically, Volume Ray-Casting renders images from volumetric datasets, typically used in some scientific areas, such as medical imaging -- This article aims to describe the development of a combined visualization of tractography and volume rendering of brain T1 MRI images in an integrated way -- An innovative web viewer for interactive visualization of neuro-imaging data has been developed based on WebGL -- This recently developed standard enables the clients to use the web viewer on a wide range of devices, with the only requirement of a compliant web-browser -- As the majority of the rendering tasks take place in the client machine, the effect of bottlenecks and server overloading are minimized -- The web application presented is able to compete with desktop tools, even supporting high graphical demands and facing challenges regarding performance and scalability -- The developed software modules are available as open source code and include MRI volume data and tractography generated by the Diffusion Toolkit, and connectivity data from the Connectome Mapping Toolkit -- Our contribution for the Volume Web Viewer implements early ray termination step according to the tractography depthmap, combining volume images and estimated white matter fibers -- Furthermore, the depthmap system extension can be used for visualization of other types of data, where geometric and volume elements are displayed simultaneouslyÍtem ReWeb3D: enabling desktop 3D applications to run in the web(ACM, 2013) Glander, Tassilo; Moreno, Aitor; Aristizábal, Mauricio; Congote, John; Posada, Jorge; García-Alonso, Alejandro; Ruíz, Oscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAECurrently, 3D rendering is accessible within Web browsers through open standards such as WebGL, X3D, and X3DOM -- At the same time, there is wealth of mature desktop software which comprises algorithms, data structures, user interfaces, databases, etc -- It is a challenge to reuse such desktop software using the Web visualization resources -- In response to this challenge, this article presents a novel framework, called ReWeb3D, which minimizes the redevelopment for migration of existing 3D applications to the Web -- The redeployed application runs on a Web server -- ReWeb3D captures lowlevel graphic calls including geometry, texture, and shader programs -- The captured content is then served as a WebGLenabled web page that conveys full interactivity to the client -- By splitting the graphics pipeline between client and server, the workload can be balanced, and highlevel implementation details and 3D content are hidden -- The feasibility of ReWeb3D has been tested with applications which use OpenSceneGraph as rendering platform -- The approach shows good results for applications with large data sets (e.g. geodata), but is less suited for applications intensive in animations (e.g. games)Ítem Volume Ray Casting in WebGL(Intech Open, 2012) Congote, John; Kabongo, Luis; Moreno, Aitor; Segura, Alvaro; Beristain, Andoni; Posada, Jorge; Ruíz, Oscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAE