3D landform rendering method and rendering apparatus

Abstract

The invention discloses a 3D terrain rendering method which comprises the following steps: the current level of detail (LOD) of a terrain block is determined in accordance with the viewing distance; the gradient parameter is calculated in accordance with the viewing distance and the preset gradient section which corresponds to the current LOD of the terrain block and the vertex height value of the terrain block is corrected with the gradient parameter; and a grid model which is one precision level higher than the current LOD of the terrain block is selected and the terrain block is rendered with the corrected vertex height value. The method and the device render the corrected terrain block data vary continuously in accordance with the variation of the view point; and even the LOD of the terrain block varies, no terrain 'jumping' phenomena appears. The invention discloses a 3D terrain rendering device simultaneously.

Description

technical field [0001] The present invention relates to the technical field of 3D (3D), in particular to a 3D terrain rendering method and a rendering device. Background technique [0002] 3D terrain rendering refers to performing operations such as coloring, vertex transformation, and mapping on 3D modeled terrain. In 3D terrain rendering, in order to reduce the processing burden of rendering, a level of detail (LOD, Level Of Detail) technology appears. The LOD technology divides terrain rendering into different levels of fineness. The terrain that is closer to the viewpoint (that is, the viewing distance is smaller) is rendered with higher details, and the terrain that is farther from the viewpoint (that is, the viewing distance is larger) is rendered with lower details. [0003] In 3D terrain rendering, the complete terrain is generally divided into small terrain blocks of equal size, and each terrain block is rendered according to its plane mesh model and vertex data. ...

AI Technical Summary

Problems solved by technology

However, since the plane mesh model and vertex data corresponding to different LOD levels of the same terrain block are different, when the LOD level changes, the parameters such as vertex height, brightness, and chromaticity of the terrain block will change suddenly, making The geometry, lighting, color, etc. of the rendered terrain blocks may change suddenly, resulting in obvious terrain "jumping" phenomenon in the rendered 3D terrain, seriously affecting the rendering effect

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