With OpenGL, you can render high-quality 3d scenes in real time, without the overhead of a ray-tracer.
使用OpenGL，可以实时地呈现高品质的3d场景，而没有光线跟踪器那样大的开销。
Under the conditions prescribed by guaranteeing dem important area precision quickening the computer to render 3d sight model and satisfy 3d Visualization demand in real-time and interactive manner.
在保证DEM重要区域精度的条件下，加快了计算机绘制三维景观模型的速度，满足了三维可视化实时交互的需求。
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