Local refreshing method of large-scale terrain rendering in three-dimensional scene

A large-scale terrain and three-dimensional scene technology, applied in the field of spatial geographic information systems, can solve problems such as low refresh efficiency, and achieve the effect of ensuring refresh speed and reducing data scheduling time.

Inactive Publication Date: 2017-10-24
ZHEJIANG KELAN INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technology described by this patented allows for faster loading or updating of terrain without having everything changed again during flight. This saves on processing times while still maintaining high levels of accuracy.

Problems solved by technology

This patented describes an improved way for displaying three dimensional terrains on computer screens during flight simulation or other applications that require realistically accurate maps such as those used in airplanes navigation systems. However, existing methods have limitations due to their limited ability to update areas within this map without overloading them too much.

Method used

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  • Local refreshing method of large-scale terrain rendering in three-dimensional scene

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Embodiment 1

[0033] Suppose you need to load the local Hangzhou terrain dataset in the global 3D scene, follow step 1 to obtain the local Hangzhou terrain's two-dimensional rectangular range xmin, xmax, ymin, ymax, where x represents its longitude direction, and y represents its latitude direction. According to step 2, do the intersection operation between the rectangular range and the terrain tiles loaded in the scene, and traverse to the sub-terrain tiles to get all the terrain tiles in the scene that overlap with the rectangular range; follow step 3 , rebuild the image and elevation datasets of these terrain tiles, construct new terrain tiles, and replace the original terrain tiles in the scene accordingly, which completes the partial refresh of Hangzhou terrain.

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Abstract

The invention provides a local refreshing method of large-scale terrain rendering in a three-dimensional scene. The local refreshing method comprises steps that step1: a local terrain region required to be loaded is preprocessed; step2: various levels of terrain tiles superposed with the local terrain region are acquired; step3: the data refreshing of the local terrain region is realized. When the local terrain data is loaded in the three-dimensional scene, not all of terrain data are required to be reloaded, and only the local terrain blocks required to be loaded are updated, and therefore data scheduling time is reduced, and the refreshing speed of the loaded terrain data is guaranteed.

Description

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Claims

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Application Information

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Owner ZHEJIANG KELAN INFORMATION TECH CO LTD
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