Rendering an animation in a global illumination framework is a very costly process. Each frame has to be computed with high accuracy to avoid both noise in a single frame and flickering from frame to frame. Recently an efficient solution has been presented for camera animation, which reused the results computed in a frame for other frames via reprojection of the first hits of primary rays. This...

Virtual reality (VR) systems are used in a variety of applications within industry, education, public and domestic settings. Research assessing reported symptoms and side effects of using VR systems indicates that these factors combine to influence user experiences of virtual reality induced symptoms and effects (VRISE). Three experiments were conducted to assess prevalence and severity of sick...

In visual navigation, landmarks can be used in a number of different ways. In this paper, we investigate the role of global and local landmarks in virtual environment navigation. We performed an experiment in a virtual environment called ‘‘Hexatown,’’ consisting of a regular hexagonal grid of streets and junctions. Each junction was identiŽed by the presence of distinct local landmarks (buildin...

The paper proposes method for detection of laser spot emitted by a laser pointer. A camera captures projection screen on which is displayed image from a digital projector and also laser spot from a laser pointer. Our developed algorithm can effectively detect red and green laser spot in real-time using image processing and by setting up camera to be captured high intensity of laser beam. To dem...

ABSTRACT We report on observations of PSR B1508 + 55’s scintillation at the Effelsberg 100-m telescope spanning from early 2020 to 2022. In autumn 2020, close time pulsar was predicted cross echoes in its pulse profile, a sudden transition arcs peculiar stripe-like features parabolic arclets observed. To infer geometric model scattering, we measure effects annual velocity curve Earth, relative ...

A general-purpose augmented reality apparatus was developed. The system uses rapidly scanned lasers to display information directly onto the patient using the patient as a ‘‘projection screen’’. The device is also capable of measuring the location of projected laser spots with a 3D camera to ensure that the display is accurate, to apply corrections to the projection path and to assist in regist...

We present a novel custom-built 3D immersive environment, called the Immersive Cabin (IC). The IC is fully enclosed with an automatic door on the rear screen, and thus very different from existing CAVE environments. Our IC, the construction of the projection screens and stereo projectors as well as the calibration procedure are explained in details. The projectors are driven by our Visual Compu...

Realistic part interaction is an important component of an effective virtual assembly application. Both collision detection and part interaction modeling are needed to simulate part-topart and hand-to-part interactions. This paper presents a comparison of several common collision detection algorithms and examines the VoxMap Pointshell (VPS) method as it is used in an application to evaluate pro...