遮挡裁剪和应用层次细节模型是两种有效的三维复杂场景渲染加速算法。
Occlusion culling and LOD (Level of Details) both are effective techniques in accelerating the rendering process of 3d large scene.
介绍了模拟港口岸形、物标回波和其他助航物标回波的生成，雷达回波的干扰、遮挡和衰减，固定距标圈、电子方位线和活动距标圈的显隐与图像的有关裁剪算法等。
Also the details about the coast, target and other navigational subjects echo and the interference of echo and Ring, Ebl, Vrm of Radar and clipping algorithm etc.
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