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Parallel and Real-time Rendering of Streaming Meshes

Author: LiXiangHua
Tutor: JinShiYao
School: National University of Defense Science and Technology
Course: Computer Science and Technology
Keywords: Drift grid out-of-core Parallel The level of detail Mesh Segmentation
CLC: TP391.41
Type: Master's thesis
Year: 2007
Downloads: 32
Quote: 2
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Abstract


With the continuous development of three-dimensional laser ranging and modeling techniques, the accuracy of three-dimensional geometric model is getting higher and higher, increasing the amount of data, which gives a three-dimensional geometric model drawing, editing and transmission operation brought great pressure. This is because the conventional digital geometry processing algorithms generally require the entire original model is loaded into memory and then calculated, and the computer's memory capacity is limited, and close to (or greater than) the content capacity model could not be processed. To this end, based on the external memory (out-of-core) processing technology become a hot research of large-scale complex 3D geometric models. Out-of-core is usually first in the external memory on the model data reorganization, through different ways will need the local data is transferred to the memory is calculated. Stream processing technology came into being in order to solve the problem of conventional out-of-core algorithm restructuring pretreatment time and complex data structures, the grid, the technical design of the complex three-dimensional model of a new organizational format, in order to achieve the large scale complex grid drawn. To draw ideological drift cell, using parallel processing technology, this paper investigates how grid flow format is simple, efficient out-of-core real-time rendering. The main work includes the following aspects: (1) design a large-scale drift-grid mesh model parallel rendering algorithms, the algorithm established a separate thread for each model drawn by a mutex variable so that the model memory used in rotation, so that multiple models can parallel rendering. Experimental results show that this approach is indeed effective for solving practical problems, can improve the efficiency. Drift of the large amount of data model formats established effective model detail level data structures, with the help of this data structure to achieve a dynamic LOD control grid viewpoint-based rendering algorithm, according to the viewpoint of the algorithm is to map out the model distance from model to select the level of detail of the model, which use as little data as possible for the user to provide a realistic visual effects. 3 using simple calculation based on the parallel plane family grid cutting method, the large-scale grid model is divided into a smaller amount of data model. Mesh segmentation based on a large-scale model grid draw. Grid block, front parallel rendering algorithm, and take full advantage of the correspondence between the sub-block grid boundary in one cycle to complete the drawing of the entire grid model. On this basis, the level of detail, a control method based on the viewpoint also used on a large scale model of the block.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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