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Fast BVH construction and refit for ray tracing of dynamic scenes

机译：快速BVH构造和改装，用于动态场景的光线跟踪

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As the complexity of virtual environments increases, it becomes a critical issue to ray tracing of dynamic scenes interactively. In this paper, we propose an effective method to address this issue. Firstly, we improve the Surface Area Heuristics (SAH) based bounding volume hierarchies (BVHs) construction algorithm and present a sub-interval search criterion for predicting the optimal split plane position. Compared with the standard SAH approach, our algorithm is much faster but has a little quality degradation. Secondly, we present two new BVH refitting operations, which could run fast and obtain considerable quality of BVHs. The two operations are general and applicable to complex and dynamic scenes including a wide range of deformation. Lastly we use multithread to handle the dynamic scenes during animation, one thread for BVHs rebuilding asynchronously, the others for BVHs refitting and ray tracing. The results of this experiment show that our method is effective. Compared with the previous works, it obtains higher and smoother frame rate.
机译：随着虚拟环境的复杂性增加，以交互方式跟踪动态场景的光线成为关键问题。在本文中，我们提出了一种解决此问题的有效方法。首先，我们改进了基于表面积启发法（SAH）的边界体积层次结构（BVHs）的构建算法，并提出了用于预测最佳分离平面位置的子间隔搜索标准。与标准的SAH方法相比，我们的算法速度更快，但质量下降很少。其次，我们介绍了两个新的BVH改装操作，它们可以快速运行并获得相当质量的BVH。这两个操作是通用的，适用于复杂的动态场景，包括大范围的变形。最后，我们使用多线程来处理动画过程中的动态场景，一个线程用于BVH的异步重建，另一个线程用于BVH的重新装配和光线跟踪。实验结果表明，该方法是有效的。与以前的作品相比，它获得了更高，更流畅的帧速率。

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