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Three-dimensional scene rendering algorithm based on LOD (Levels of Detail) model and quadtree level structure

A technology of 3D scene and hierarchical structure, applied in the field of 3D scene modeling, it can solve the problems of reliable model and unsmooth browsing, and achieve the effect of smooth speed.

Inactive Publication Date: 2015-07-01
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0005] The purpose of the present invention is to solve the browsing speed of 3D models under massive data, and provide a 3D scene rendering algorithm based on LOD model and quadtree hierarchy, thereby improving the accuracy of models and unsmooth browsing in 3D GIS systems

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  • Three-dimensional scene rendering algorithm based on LOD (Levels of Detail) model and quadtree level structure

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Embodiment Construction

[0018] Such as figure 1 As shown, the three-dimensional scene rendering algorithm based on the LOD model and the quadtree hierarchy of the present invention is composed of the following steps:

[0019] (1) First, according to the accuracy of application requirements, the size of the visualized scene, and the complexity and aggregation of ground objects, determine the level standard of LOD modeling: the LOD model is divided into discrete LOD, continuous LOD and multi-resolution LOD in terms of geometric structure. When modeling the scene, due to the richness of the landscape, we choose to build a multi-level LOD model. If there are too many LOD levels, the model data at different levels of detail will be frequently read, which will affect the smoothness of real-time rendering. Too few LOD levels will lead to different levels of detail. There are obvious sudden changes in level switching.

[0020] (2) Data layering: Before data storage and organization, graphics and attribute d...

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Abstract

The invention discloses a three-dimensional scene rendering algorithm based on an LOD (Levels of Detail) model and a quadtree level structure, and adopts the LOD model to carry out layering and partitioning processing on data to improve the browsing speed of a three-dimensional scene. The three-dimensional scene rendering algorithm comprises the following steps: firstly, according to application requirement precision, the size of a visual scene and the complexity and the aggregation degree of surface features, determining a grade standard of LOD modeling; carrying out data layering; and carrying out data partitioning: taking a small-scale scene as one block for processing in a roaming process, and carrying out the portioning processing on scene data when the scale of scene data is enlarged. The LOD model is used for realizing real-time visualization, the quadtree level structure is utilized to display, query and analyze geographic information, the scene is segmented into a plurality of subscenes to ensure that the total data volume of a display area is not huge and the real-time browsing speed is smooth when the three-dimensional scene roams.

Description

technical field [0001] The invention relates to a three-dimensional scene modeling technology, in particular to a three-dimensional scene rendering algorithm based on an LOD model and a quadtree hierarchy. Background technique [0002] The complex industrial process simulation system has been more and more widely used in production, especially in industries such as substations that have high requirements for operational safety. Electricity is the main power source of modern production. With the increasing dependence of modern industry on electric power, the reliability, safety and quality of power supply directly affect the economic benefits of industrial production. However, the power system is developing extremely fast, and it is necessary to establish a team of professional technicians and on-duty personnel with high professional quality to adapt to it. For this reason, it is necessary to carry out practical training and professional training for post operators, so as to...

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Application Information

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IPC IPC(8): G06T15/00G06T17/00
Inventor 苏克明吴琳张晓锋冯颖余江梁顺吴煜伟陈炜李霞詹起林
Owner STATE GRID CORP OF CHINA
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