An application featuring virtual humans is a program that simulates an artificial world inhabited by virtual people. Recently, only either small artificial worlds inhabited by a few complex virtual humans, or larger worlds with tens of humans, but performing only walking and crowding, are simulated. This is not surprising: a large world inhabited by complex virtual humans requires unreasonable ...

Augmenting images with consistent lighting is possible with differential rendering. This composition technique requires two lighting simulations, one simulation with only real geometry and another one with additional virtual objects. The difference of the two simulations can be used to modify the original pixel colors. The main drawback of differential rendering is that not all modified light p...

Exploiting an eecient scheme for parallel discrete event simulation requires precise information about simulation runs. However, the virtual time synchronization algorithm gives rise to a wide gap between simple estimation and the actual simulation. This paper proposes a new performance estimation model for parallel simulation using synchronous conservative algorithm. The model assumes an expon...

A fluid simulation suitable for use in real-time virtual environments running at interactive frame rates has the potential to greatly improve the quality of the virtual environments it is used in. To this end we present a method suitable for use in real-time grid-based fluid simulation that considerably reduces the amount of data being processed at each simulation step by removing unused cells ...

This paper presents an ongoing schema to develop virtual models of physical setup equipment and their integration into the corresponding remote laboratory. For this task, we use Easy Java Simulations (Ejs), a tool that allows us to make a complete simulation model based on the physical laws of the setup. Ejs is also able to produce virtual views that are necessary for model user interaction. Th...

Research Background This recently completed research project has resulted in the development of a wheelchair motion platform which, in conjunction with a virtual reality facility, can be used to address issues of accessibility in the built environment. This venture represents a collaborative effort between architects, bioengineers and user groups and has investigated topics related to platform ...

New emerging multimedia standards, like the MPEG-4 standard allow the creation of virtual or synthetic acoustical environments. To auralize an environment from its geometric description, simulation algorithms for acoustic wave propagation are required. The different methods used for computational modeling of room acoustics can be divided into three groups [1]: statistical models, ray-based mode...

The data must be exchanged in real time, with level of fidelity sufficient to permit their acceptable representation by all other participating simulators. The question "what is sufficient?" requires a detailed understanding of the purpose for which DVS is being used. For training applications it turns out that a three-dimensional rendering with visual fidelity similar to that of an arcade or h...

Scientific simulations have long been used to investigate the behaviour of systems governed by complex mathematical models. A wide range of simulation frameworks, visualisation methods and analysis tools have been developed to assist the development of these simulations. As computer hardware increases in power, computer games aim to create more immersive environments which now include physics e...

With the advancement of minimally invasive procedures in urology, the goal is to train a urologist who is highly competent and confident in performing these techniques. Because of the specific risks, visuospatial relationships, and the steep learning curve that is unique to laparoscopy, hands-on training on a box or a visual simulator is the recommended way to start learning laparoscopic skills...