基于层次包围盒的纹理体绘制加速算法

An Accelerating Texture-based Volume Rendering Algorithm with BVH

提出了一种层次包围盒(BVH)方法,以加速基于GPU的3D纹理体绘制。该方法首先利用GPU的片元着色程序实现了后分类3D纹理体绘制;然后设定高度逐层对体数据进行分解,为每个生成的子体数据建立相应的包围盒,并用对应层次包围盒树的结点保存相关信息;最后遍历层次包围盒树,读取层次包围盒树的结点信息以判断对应子体数据是否被绘制或跳过,从而实现空间跳跃,加速3D纹理体绘制。实验结果表明,本文方法与基于GPU的3D纹理体绘制算法相结合,能取得良好的加速效果。

A method to accelerate 3D texture based volume rendering is proposed based on hierarchical bounding volumes（BVH）. First, a post-classification 3D texture volume rendering is realized using GPU fragment shaders. Then, the original volume data is divided based on space position layer by layer according to the height of BVH tree. In each layer, the volumes corresponding to BVH tree nodes are subdivided into eight sub-volumes along three orthogonal coordinate axes. The bounding volumes are established for sub-volumes and the correlative information is stored in the corresponding BVH tree nodes. Finally, when rendering the volume by traversing BVH tree, information of BVH tree nodes is read for judging whether the corresponding sub-volume should be rendered or jumped. The experimental results show that good accelerating effects can be obtained when combining this method with 3D texture volume rendering based on GPU.