基于层次包围盒的光线投射算法研究

Ray-Casting Algorithm Based on BVH

提出了一种基于层次包围盒的光线投射方法,引入OBB层包围盒减少投射光线数量,以遍历方式实现空体素跳跃,对原始图像进行预处理,提高三维图像显示效果,加快绘制速度.通过对实际医学胸部CT图像病例进行三维重建,显示效果较好,绘制速度得到提升,验证了该算法的有效性.

A ray-casting algorithm based on BVH（Bounding Volumes of Hierarchy） is presented.OBB BVH was introduced to reduce the amount of the light.By traversing BVH tree to jumped empty voxel,we had pretreated the data of the original medical images.Therefore,the image quality was improved,and the speed of rebuild quickened.Good performance speed and 3D display were achieved by a three-dimensional reconstruction experiment with real medical chest CT images.The effectiveness of the improved lighting projection algorithm for rapid 3D visualization of the chest CT images was confirmed.