volume restriction

With the rapid development of Internet, network scale, user quality and business volume assume the detonation-like growth. Network jam already became the bottle-neck question that restriction network development and application.

随着Internet的迅速发展，网络规模、用户数量及业务量呈现爆炸式增长，由此引发的网络拥塞已经成为制约网络发展和应用的瓶颈问题。

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Direct volume rendering based 3D texture can guarantee image quality and reach interactive frame rates. Because of the restriction of texture memory, it is difficult to render large volume data.

基于3D纹理的直接体绘制算法可以在保证图像质量的同时达到较好的交互性能，但由于纹理内存的限制，大规模数据场的3D纹理直接体绘制比较困难。

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