论文标题
尝试使用射线铸造使用复杂插值剂渲染自适应高度场
An Attempt of Adaptive Heightfield Rendering with Complex Interpolants Using Ray Casting
论文作者
论文摘要
在这份技术报告中，我们记录了我们尝试使用射线铸造实时插值可视化自适应高度场的尝试。射线铸造的性能在很大程度上取决于使用的插值及其有效评估。不幸的是，仅在很少的简单的，零件的多项式表面上给出了射线表面相交的分析溶液。在我们的用例中，我们在自适应网格上定义的径向基函数近似近似，为此我们提出了一个两步解决方案：首先，我们将表面的当前可见部分离散，并平滑地近似为一组外屏幕外缓冲区。在第二步中，我们将这些外屏幕缓冲液解释为常规高度场，可以使用简单的双线性插入剂进行射线铸造有效地渲染。尽管我们的方法有效，但我们的定量评估表明，性能在很大程度上取决于高度场的复杂性和大小。对于任意高度场而言，无法实现实时性能，这就是为什么我们将发现结果报告为实时地地理空间可视化的尝试失败的原因。
In this technical report, we document our attempt to visualize adaptive heightfields with smooth interpolation using ray casting in real time. The performance of ray casting depends strongly on the used interpolant and its efficient evaluation. Unfortunately, analytical solutions for ray-surface intersections are only given in the literature for very few simple, piece-wise polynomial surfaces. In our use case, we approximate the heightfield with radial basis functions defined on an adaptive grid, for which we propose a two-step solution: First, we reconstruct and discretize the currently visible portion of the surface with smooth approximation into a set of off-screen buffers. In a second step, we interpret these off-screen buffers as regular heightfields that can be rendered efficiently with ray casting using a simple bilinear interpolant. While our approach works, our quantitative evaluation shows that the performance depends strongly on the complexity and size of the heightfield. Real-time performance cannot be achieved for arbitrary heightfields, which is why we report our findings as a failed attempt to use ray casting for practical geospatial visualization in real time.
