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CAD platform-based hierarchical rendering method for OSGB data

A data rendering and platform technology, applied in image data processing, 3D image processing, instruments, etc., can solve problems such as the inability to use oblique photography real-scene models, and achieve the effect of good marketing value

Active Publication Date: 2018-11-06
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, CAD does not directly support the OSGB data format, which makes it impossible for land, planning, landscape and other units to use oblique photographic reality models

Method used

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  • CAD platform-based hierarchical rendering method for OSGB data
  • CAD platform-based hierarchical rendering method for OSGB data
  • CAD platform-based hierarchical rendering method for OSGB data

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Embodiment

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 2 As shown, each independent OSGB node data is parsed, and the parsed result data (model data, texture image) is further cached as a DWG format model data file; the OSGB node data to be displayed is selected, and according to these cached DWG file builds an index file; obtains the information of each entry (corresponding to a node) in the index file, including the relative path of the cache file and the bounding box of the cache file in world coordinates. According to the node organization rules, construct the logical structure of the LOD tree, the structure is as follows figure 1 As shown; create an LOD tree access node, which is used to select nodes in the LOD tree. The access node is attached with the viewing distance and visualization range in the CAD 3D view. If the tree node level is within the viewing distance ra...

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Abstract

The invention discloses a CAD platform-based hierarchical rendering method for OSGB data. The method comprises the following steps of: firstly analyzing OSGB data to generate model data and texture data; recombining the model data and the texture data by utilizing an ARX so as to generate a three-dimensional model in CAD; constructing an LOD logic tree of a DWG three-dimensional model by utilizingan LOD algorithm; and finally screening nodes in the LOD logic tree according to a sight distance and a visible range in the CAD, loading the current frames of to-be-displayed nodes, and deleting current frames of nodes not needing display so as to complete hierarchical rendering of the OSGB data in the CAD. According to the method, the application limit of OSGB data is broken through, and a newtechnical way is provided for directly using oblique photography live-action models on CAD software by departments such as land, planning and landscape.

Description

technical field [0001] The invention belongs to the field of computer applications, in particular to a method for rendering OSGB data in AutoCAD. Background technique [0002] Oblique photographic real-scene models have been widely used in various fields. As a general format for oblique photographic real-scene models, the OSGB data format comes with a model accuracy level of more than 20 pyramid levels. Using this data format, you can make full use of LOD (multi-level detail structure ) advantages, speed up data loading, and display a 3D real scene model with real effects. However, CAD does not directly support the OSGB data format, which makes it impossible for units such as land, planning, and landscape to use oblique photography real-world models. Contents of the invention [0003] The purpose of the present invention is to provide a method for rendering the OSGB data format in CAD with a multi-level detail structure, aiming at the rendering defect that the existing CA...

Claims

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Application Information

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IPC IPC(8): G06T15/00
CPCG06T15/005
Inventor 范冬林康传利刘立龙蓝贵文韦波谢美亭陈家宙
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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