Real-Time Streaming and Rendering of Terrains

Deb, Suash; Bhattacharjee, S.; Patidar, Suryakant; Narayanan, P. J.

doi:10.1007/11949619_25

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…Therefore, most scholars improve it from two aspects: data compression and reducing the transmission frequency of images. For example, some scholars proposed to use the wavelet method to replace the traditional JPEG image compression method [8], and some scholars proposed to transform 3D scenes into panorama while transmitting panorama through progressive transmission protocol [9]].…”

Section: B Image-based Renderingmentioning

confidence: 99%

Real-Time High Realistic Web Display Method of Complex 3D Model

et al. 2021

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With the in-depth application of 3D models in many fields, the display of models, especially the model display based on B / S architecture, has become an indispensable part of the application of 3D models. The development of 3D modeling technology has led to the emergence of a large number of complex three-dimensional models with more than one hundred thousand facets and hundred megabytes of file size. Coupled with the limit of B / S architecture by the server's concurrency, network bandwidth, browser's processing capabilities, and many other objective factors, how to achieve its real-time and high-realistic display on the web pages has become one of the hot spots research in the field of graphics, which has great research significance and challenge. In order to resolve the above problems, we propose a new model display method. The method pre-renders the model into a two-dimensional image by sampling the subdivide surface of the model's circumscribed sphere and uses the view-dependent level-of-detail method to divide the pre-rendered image into different layers and tiles. Combined with the optimization, including adaptive and progressive network transmission, index-weighted user interaction prediction, and Hilbert-based image indexing, the method achieves a frame rate of more than 20 frames per second in the actual tests.

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Section: B Image-based Renderingmentioning

confidence: 99%

Real-Time High Realistic Web Display Method of Complex 3D Model

et al. 2021

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“…There is nothing essential in the choice but it has an effect on the resulting set of cell configurations needed to properly define a sequence to traverse the triangles. To allow fast processing, compact representations and easy traversing [4,12], we organize the terrain into squared blocks each of which consists of a number of tiles. In the current implementation, blocks are of size 512×512 and tiles of size 64×64.…”

Section: Triangulation Topologymentioning

confidence: 99%

Back-to-Front Ordering of Triangles in Digital Terrain Models over Regular Grids

Alonso

Joan-Arinyo

2018

J. Comput. Sci. Technol.

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Visiting triangles that conform a digital terrain model is a core operation in a number of fields like animation and video games or generating profiles, cross-sections and contours in civil engineering. Performing the visit in an efficient manner is an issue specially when the output of the traversal depends in some way on additional parameters or informations that change over time, for example a moving point of view. In this work we report a set of rules such that given a digital terrain model defined over a regular grid and an arbitrary point outside the terrain, for example a point of view, defines a total back-to-front order in the set of digital terrain model triangles with respect to the point. The set of rules is minimal, complete and correct. To assess how the rules perform, we have implemented a CPU based algorithm for realistically rendering height fields defined over regular grids. The algorithm does not make use of the z-buffer or shaders featured by our graphics card. We show how our algorithm is implemented and we show visual results obtained from synthetic and real data. We further discuss the algorithm performance with respect to two algorithms: a naive algorithm that visits triangles according to grid indices which does not solve the hidden line problem, and the z-buffer provided by the graphics card featured by our computer. Our algorithm allows real time interaction when the point of view arbitrarily moves in 3D space and we show that its performance is as good as that of the z-buffer graphics card.

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“…But the process requires seamless stitching at the boundaries. According to Deb et al [6], Wagner's technique is not suited for the terrains with large height variations and that is why they tweak the technique by having the projection on realtime average height of terrain for a client/server terrain streaming to handle heterogeneous clients. The blending factors are calculated on a per-tile basis because of the use of a regular tile structure, thus, reducing the amount of computation.…”

Section: State Of the Artmentioning

confidence: 99%

Seamless Heterogeneous 3D Tessellation via DWT Domain Smoothing and Mosaicking

Hayat

Puech

Islam

et al. 2010

EURASIP J. Adv. Signal Process.

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With todays geobrowsers, the tessellations are far from being smooth due to a variety of reasons: the principal being the light difference and resolution heterogeneity. Whilst the former has been extensively dealt with in the literature through classic mosaicking techniques, the latter has got little attention. We focus on this latter aspect and present two DWT domain methods to seamlessly stitch tiles of heterogeneous resolutions. The first method is local in that each of the tiles that constitute the view, is subjected to one of the three context-based smoothing functions proposed for horizontal, vertical, and radial smoothing, depending on its localization in the tessellation. These functions are applied at the DWT subband level and followed by an inverse DWT to give a smoothened tile. In the second method, though we assume the same tessellation scenario, the view field is thought to be of a sliding window which may contain parts of the tiles from the heterogeneous tessellation. The window is refined in the DWT domain through mosaicking and smoothing followed by a global inverse DWT. Rather than the traditional sense, the mosaicking employed over here targets the heterogeneous resolution. Perceptually, this second method has shown better results than the first one. The methods have been successfully applied to practical examples of both the texture and its corresponding DEM for seamless 3D terrain visualization.

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Real-Time Streaming and Rendering of Terrains

Cited by 8 publications

References 12 publications

Real-Time High Realistic Web Display Method of Complex 3D Model

Real-Time High Realistic Web Display Method of Complex 3D Model

Back-to-Front Ordering of Triangles in Digital Terrain Models over Regular Grids

Seamless Heterogeneous 3D Tessellation via DWT Domain Smoothing and Mosaicking

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