直接体绘制本质是重采样与图像合成。
The essential of direct volume-rendering technique are re-sample and image synthesize.
本文主要研究三维地震数据场的直接体绘制方法——光线投射算法。
In this paper, three-dimensional seismic data field of direct volume rendering-Ray Casting Algorithm is mainly studied.
在象空间中的直接体绘制方法中，本文提出了一种新的估计表面法向量的方法。
And a new method to estimate the normal vector of the surface in Direct Voltime Rendering in Image Space is introduced.
由于体绘制技术是将三维的离散数据直接转换为二维图像而不必生成中间几何图元，所以又称为直接体绘制。
Volume rendering is also known as direct volume rendering, for no intermediate geometry primitives are generated during its visualization process.
最后，将处理后的水体和地层数据合并，并通过直接体绘制中的光线投射算法有效地实现了水声体数据的三维可视化。
Finally, the processed water and seafloor data is combined, and then the visualization of SAS volume data is achieved by the ray casting algorithm of direct volume rendering.
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。
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.
其中的体绘制方法直接对所有的体数据进行处理，有利于保留三维医学图像的细节信息，具有较好的绘制效果。
The volume rendering method does shading processes to all of the volume data directly, maintains the details of the medical images, and achieves better render results.
其中的体绘制方法直接对所有的体数据进行处理，有利于保留三维医学图像的细节信息，具有较好的绘制效果。
The volume rendering method does shading processes to all of the volume data directly, maintains the details of the medical images, and achieves better render results.
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