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.
传递函数将体数据灰度值映射为颜色和不透明度，来突出显示特定的组织结构。
Mapping scalar value into a color specification and an opacity value, transfer function could highlight specific structure.
传递函数将体数据灰度值映射为颜色和不透明度，来突出显示特定的组织结构。
Mapping scalar value into a color specification and an opacity value, transfer function could highlight specific structure.
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