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Item Real-Time Simulation of Flexible Materials in Avango Virtual Environment Framework(Eurographics Association, 2003) Klimenko, Stanislav; Nikitina, Lialia; Nikitin, Igorhis paper describes a system for real-time simulation of linear elastic deformations of volumetric objects in Virtual Environments, implemented in Avango VE Framework 1. The approach makes use of the methods of Finite and Boundary Elements and precomputed Greens functions, and supports real-time interactive deformations of large elastic models, containing more than 10,000 volumetric nodes, at the graphics update rate 85fps.Item Parallel Visibility Test and Occlusion Culling in Avango Virtual Environment Framework(Eurographics Association, 2003) Klimenko, Stanislav; Nikitina, Lialia; Nikitin, IgorReal-time visibility test is an attractive feature for Virtual Environment (VE) applications where large datasets should be interactively explored. In such scenes most of the objects are usually occluded by other ones, and their omission from rendering can significantly accelerate the graphical performance. In this paper we present our novel approach for occlusion culling and its implementation in VE system Avango1. Visibility test module performs real-time update of the list of visible objects by means of color labeling and either hardware or software histogramming of corresponding color buffer. Exploiting the distribution capabilities of Avango, the main draw and visibility test processes are parallelized to different computers running Irix or Linux. Being applied to an architectural model containing 260,000 textured triangles, our method accelerates the graphical performance from 8 to 32 stereoimages/sec.Item Real-Time Simulation of Flexible Materials in Avango Virtual Environment Framework(Eurographics Association, 2003) Klimenko, Stanislav; Nikitina, Lialia; Nikitin, IgorThis paper describes a system for real-time simulation of linear elastic deformations of volumetric objects in Virtual Environments, implemented in Avango VE Framework 1. The approach makes use of the methods of Finite and Boundary Elements and precomputed Green’s functions, and supports real-time interactive deformations of large elastic models, containing more than 10,000 volumetric nodes, at the graphics update rate 85fps.Item Crosstalk reduction in passive stereo-projection systems(Eurographics Association, 2003) Klimenko, Stanislav; Frolov, Pavel; Nikitina, Lialia; Nikitin, IgorWe describe a scheme for reduction of depolarization artefacts in passive stereo-projection systems. These problems appear due to non-perfectness of stereo-projection equipment: depolarization of the light due to reflection from the screen or due to the passage through the screen, non-ideality of polarizing filters, mixing of left- and right-eye images in a change of relative orientation of the filters, which together produce a strong crosstalk effect, resulting to difficulting stereo-perception. The artefacts are eliminated by software methods, using linear filtering of the image before its projection to the screen. We have implemented this algorithm in VE system Avango 1 by means of texture mappings. All necessary operations are performed by the graphics board, thus providing the real-time rendering rate. The described method considerably improves stability of stereo-perception, making high-quality performances of virtual environment possible on affordable equipment.