本文提出了一種新的基于視向LOD 自動(dòng)生成算法，該算法結(jié)合DEM 均勻網(wǎng)格模型，
以“塊”為模型簡化的空間單位，結(jié)合實(shí)際視覺效果中觀察點(diǎn)位置和角度對(duì)場景細(xì)節(jié)程度的影響，以一個(gè)包含視點(diǎn)視向相關(guān)因子的尺度作為簡化標(biāo)準(zhǔn)。簡化過程中采取基于點(diǎn)刪除的網(wǎng)格簡化算法的思想，建立了多層次LOD 數(shù)據(jù)模型，有效地簡化了地形的繪制，提高了生成效率。并將該算法應(yīng)用于三維雷達(dá)終端仿真系統(tǒng)中，取得了良好的效果。
關(guān)鍵字：三維顯示；多細(xì)節(jié)層次；多分辨率；視相關(guān)
Application of algorithm for LOD models based on view-dependent in three-dimensional radar terminal displays ZHANG Shun-lan ,MO Jian-wen,OUYANG Nin,ZHANG Tong （GuiLin University of Electronic Technology ,Guilin,541004,China） Abstract ：A new algorithm for LOD models automatical generation based on view-dependent is presented.The algorithm is based on DEM uniform grid model,”block” is taken as the space unit of models simplification,the effects of viewpoint and view direction are considered. Thought for mesh simplification based on deleting vertices is adopted in simplification.A multi-LOD data model is built automatically generation.The rendering of the terrain model is simplified effectively,and the efficiency of the terrain generation is improved. The algorithm is applied in
three-dimensional radar terminal displays’ emulation, and a good result is got.
Key words： 3D Display; level of detail(LOD) ; multi-resolution ; correlated with view-point