在医学图像的三维可视化中，不透明度传递函数和观察角度是需要频繁调节的，因此，难以实现实时体绘制。
In the visualization of 3d medical images, it is common to adjust the opacity transfer function and viewing Angle frequently so that volume rendering is difficult to be realized in real-time.
其次，对于具有高动态范围的浮点型数据集，在体绘制过程中使用传统的传递函数设计方法很难达到理想的绘制效果。
Secondly, for large scale high dynamic range volume datasets, it is usually not so easy to achieve the desired rendering results by traditional transfer function methods.
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