Emilio Camahort

• PhD
• Professor (Associate) at Polytechnic University of Valencia

The widespread usage of mobile devices together with their computational capabilities enables the implementation of novel interaction techniques to improve user performance in traditional mobile applications. Navigation assistance is an important area in the mobile domain, and probably Google Maps is the most popular example. This type of applicati...

Omni-directional video (ODV) is a novel medium that offers viewers a 360° panoramic recording. This type of content will become more common within our living rooms in the near future, seeing that immersive displaying technologies such as 3D television are on the rise. However, little attention has been given to how to interact with ODV content. We...

The goal of multimodal user interfaces is to assist users in completing tasks quicker or with fewer errors, by reducing their cognitive workload. Visual, auditory and tactile feedback modalities are commonly used as a means to provide users with information through different sensory channels. Understanding how visual, auditory and tactile feedback...

The use of stereoscopy as a depth cue in current computer graphics technology is increasingly popular. On the other hand, in a Desktop Augmented Reality (AR) environment, a web cam and a set of printed markers allow the user to interact with an augmented view of the environment in the computer display. So, it seems a logical step for Desktop Augmen...

In this Chapter, the authors will present an Augmented Reality (AR) system for teaching Inorganic Chemistry to university-level students. Augmented Reality (AR) is a computer related research area that allows users to see views of the real world enhanced with computer-generated text and visual informa-tion. AR with 3D models can be used as an educa...

In recent years developments in gaming technology have focused on Massively Multi-User PersistentWorlds. This virtual communities host thousands of users interacting with each other through the Internetin real time. Such communities require new distributed programming paradigms for implementing thevirtual life management. In this work we present a...

We introduce a new representation for modeling and rendering plants and trees. The representation is multiresolution and can be automatically generated and rendered in an efficient way. For the trunk and branches we procedurally build a multiresolution structure that preserves the visual appearance of a tree, when rendered at different levels of de...

Light fields were introduced a decade ago as a new high-dimensional graphics rendering model. However, they have not been thoroughly used because their applications are very specific and their storage requirements are too high. Recently, spatial imaging devices have been related to light fields. These devices allow several users to see three-dimens...

We study how to build optimal light-field or plenoptic models. We quantify geometric errors in light-field representations and show how geometric error bounds directly affect rendering artifacts. Artifacts depend on how the light-field is parameterized, stored, reconstructed and rendered. We present the rendering artifacts and relate them to the pr...

Creating interactive graphics applications that present to the user realistic natural scenes is very difficult. Natural phenomena are very complex and detailed to model, and using traditional modeling techniques takes huge amounts of time and requires skilled artists to obtain good results. Procedural techniques allow to generate complex objects...

Today’s virtual worlds challenge the capacity of human creation. Trying to reproduce natural scenes, with large and complex models, involves reproducing their inherent complexity and detail. Procedural generation helps by allowing artists to create and generalize objects for highly detailed scenes. But existing procedural algorithms can not always...

Light fields are a computer graphics modeling technique that represents objects using radiance samples instead of geometry. Radiance samples may be stored as sets of images or 4D arrays of pixel values. Light fields have various advantages: their rendering complexity only depends on the output image's, they can represent sophisticated illumination...

Augmented Reality (AR) is a computer related research area that allows users to see views of the real world enhanced with text and virtual information. AR with 3D models can be used as an educational aid to help students gain spatial intuition. This intuition is very useful in many disciplines like, for example, Inorganic Chemistry. We present in t...

Se explica como crear un proyecto de programación gráfica usando Visual Studio y las librerías gráficas OpenGL y GLUT https://polimedia.upv.es/visor/?id=e4382e07-0f64-f74e-aef9-11d4e1eb234e

Recent advances in display technology are introducing new devices that provide multiple viewers with a true 3D experience. These spatial imaging devices display either volumetric models or four dimensional image-based light-field models. The light field or plenoptic function gives radiance along the lines passing through a scene. Due to its higher...

Light fields are an image-based representation that represents objects using sets of digital images. Light fields are usually comprised of 4D radiance data that can be used for 3D rendering or 4D display on autostereoscopic and certain types of volumetric displays. We present a modeling and rendering system for spherical isotropic light fields. The...

A modeling technique commonly used in Computer Graphics and Simulation is L-systems. L-systems are procedural generators that fall into the category of growth simulators. They can generate complex geometries like plants and trees, shells and coral reefs, cities and landscapes, and even texture images. L-systems are typically implemented as a set of...

Autostereoscopic displays are a subject of recent research efforts in Computer Graphics. Such displays have to be fed graphics information in order to produce spatial images. This information is typically 4D radiance data called a light field. Traditionally light-field models were based on the two-plane parameterization. In this paper, however, we...

Modeling and rendering of trees has recently received a lot of attention. Models have been developed that allow photorealistic rendering of trees at interactive frame rates. However, little attention has been devoted to expressive rendering of these models. In this work we present a multiresolution model designed specifically to speed up painterly...

We present a client/server system that is able to display 3D scenes on handheld devices. At the server we extract the geometry that is visible for each client and send it. We also extract texture and material information. The clients, running on mobile devices, use that information to render realistic images. Our geometry extraction algorithm emplo...

Augmented Reality systems have recently become widely used. This is due to the new open source libraries that have emerged for fast application development. In this paper we address one of the most relevant problems in this type of systems, oscillation in the camera pose estimates. We study the oscillation of a system developed using the ARToolkit...

Autostereoscopic displays have recently received a lot of attention because they allow multiple users to view true 3D images of the same object. These devices usually display either 3D volumetric data or 4D light-field data. In this paper we address the issue of representing, building and rendering 4D light-field models like those used in autostere...

Tree modeling and rendering is an integral part of many modern computer graphics applications. Unfortu-nately, tree models are highly detailed and require a lot of geometry information. To solve this problem both image-and geometry-based simplification techniques have been proposed. These techniques build multiresolution repre-sentations that eithe...

The popularity of 3D graphics has grown exponentially in the latest years, which has lead to an increase in the range of applications where this kind of representations are used. The monitoring of industrial processes is an area where this type of simulation is rarely used, being much more common to show the information in traditional 2D interfaces...

We present a client/server system that is able to display 3D scenes on handheld devices. This kind of devices have important restric- tions of memory and computing power. Therefore, we need to limit the amount of geometry sent by the server to each client. We ex- tract the geometry that is visible for each client and send it. The clients render the...

Currently, 3d graphics are being applied to an increasingly wide range of applications. Industrial processes monitoring is an area where this type of simulation is rarely used, being much more common to represent the information in traditional 2d interfaces. We introduce here an application of data visualization for maritime container terminals. Th...

We present a simple calibration method for computing the extrinsic parameters (pose) and intrinsic parameters (focal length and principal point) of a camera by imaging a pattern of known geometry. Usually, the patterns used in calibration algorithms are complex to build (three orthogonal planes) or need a lot of features (checkerboard-like pattern)...

Modeling and rendering of synthetic plants and trees has always received a lot of attention from computer graphics practitioners. Recent advances in plant and tree modeling have made it possible to generate and render very complex scenes. Models developed so far allow low quality and photorealistic rendering as well as a fine control on the amount...

This paper presents a new method for realistic real-time rendering of tree foliage. Some approaches to this problem have been presented before but the quality of their results was not maintainable with respect to changes in view vector and observer distance. Our method is based on a hierarchy of images obtained from pre- processing the botanical tr...

This paper presents a methodology for integrating synthetic objects into real scenes. We take a set of photographs of the real scene and build a simple image-based model. We use high dynamic range images to build an accurate representation of the lighting in the scene. Then we insert a synthetic object into the model and compute its illumination an...

Modeling and rendering of plants and trees requires generating and processing large numbers of polygons. Geometry simplification methods may be used to reduce the polygon count and obtain a multiresolution representation. However, those methods fail to preserve the visual structure of a tree. We propose a different approach: procedural multiresolut...

Image-based models have recently become an alternative to geometry-based models for computer graphics. They can be formalized as specializations of a more general model, the light field. The light field represents everything visible from any point in 3D space. In computer graphics the light field is modeled as a function that varies over the 4D spa...

Image-based models have recently become an alternative to geometry-based models for computer graphics. They can be formalized as specializations of a more general model, the light field. The light field represents everything visible from any point in 3D space. In computer graphics the light field is modeled as a function that varies over the 4D spa...

A simple light-field model represents radiance through each point in 3D space along each direction in 2D directional space. Due to their spatial complexity, light-field models in Computer Graphics restrict the support of the light-field function to 4D oriented line space. This paper studies 4D light-field representations in both the continuous and...

Image-based or light field rendering has received much recen t atten- tion as an alternative to traditional geometric methods for modeling and rendering complex objects. A light field represents the r adiance flowing through all the points in a scene in all possible direc tions. We explore two new techniques for efficiently acquiring, sto ring, and...

The ability to generate visual representations of data, and the ability to enhance data into a suitable form for the purpose of visual representation, form two key components in a scientific visualization system. By a visual representation we mean the ability to render the data, using visual cues, such that the important features are readily percei...

An abstract is not available.

In this paper, a new method based on a quadtree decomposition is proposed for rendering CSG modeled solids. A surface parametric description is stored in a quadtree (VST) whose nodes represent parametric patches. Object description allows a non-polygonal boundary representation that provides more accurate point sampling information for the renderin...

Introducción a las principales características y utlilización de la librería gráfica GLUT https://polimedia.upv.es/visor/?id=e5e3c126-1c39-fb4a-91ba-096788ba9552

Image-based models have recently become an alternative to geometry-based models for computer graphics. They can be formalized as specializations of a more general model called light field or plenoptic function. The light field represents radiance arriving at any point in 3D space along every possible direction. In practical applications the light f...

In this work we propose a model and a development framework to prototype and debug Moderately Open Multi-Agent Systems. Our model has the advantage that it allows both high-and low-level behavior specification. It comes with a programming language and a development framework for fast prototyping. There is a large class of systems with reactive comp...

Se explica como programar una simple animación gráfica usando OpenGL https://polimedia.upv.es/visor/?id=c6c9b492-7084-7748-a150-81463dcc795f

Se explica como configurar la cámara y el volumen de la vista de una aplicación gráfica basada OpenGL https://polimedia.upv.es/visor/?id=0430256e-6738-aa45-8e21-024f0b0ee4bc

Introducción a las principales características y utilización de la librería gráfica de la generación de interfaces de usuario GLUI https://polimedia.upv.es/visor/?id=e8648e3d-f16e-3048-98f0-0f4d8ebb595b