结合等值面绘制与体绘制的电磁环境可视化方法

为提高现有的电磁环境三维可视化效果,提出一种将等值面绘制融合到光线投射体绘制中的网格投影算法。将等值面网格化,利用空间网格表现等值面并融合进体绘制生成的电磁环境图像中。将平面均匀网格平行投影到电磁环境体数据中具有同一数据值的数据采样点上,由此生成网格化的等值面。投影到体数据中的网格沿投射光线的反方向确定其对应于光线投射生成图像上的像素点,并将网格颜色值融合到此像素点中,实现融合绘制电磁环境。在统一计算设备架构(CUDA)下并行实现本文算法后,不仅电磁环境的绘制效果比融合前有提升,而且更新绘制速度能够达到实时,支持用户实时交互控制。

Combining isosurface rendering and volume rendering for method of electromagnetic environment visualization

To improve the effect of 3D visualization for electromagnetic environment,this paper proposes a grid projecting algorithm that makes fusion of ray-casting volume rendering with isosurface rendering for electromagnetic environment.The isosurface is transformed into a layer of grid and then the grid is rendered into the image generated by ray-casting algorithm.An inerratic plane grid is projected to the sample data points with the same value in electromagnetic environment data volume,which generates the isosurface grid.Through computing the corresponding pixels of projected grid along the inverse direction of ray-casting and then generating the fusion pixels with grid color,the fusion rendering image of electromagnetic environment is carried out.When this algorithm is implemented parallel under compute unified device architecture (CUDA),the rendering effect of electromagnetic environment is improved compared with that before fusion,and the rendering efficiency is high enough to support user real-time interactive control.