Physics simulation of slender elastic objects often requires discretization as a polyline. However, constructing a polyline from Gaussian splatting is challenging as Gaussian splatting lacks connectivity information and the configuration of Gaussian primitives contains much noise. This paper presents a method to extract a polyline representation of the slender part of the objects in a Gaussian splatting scene from the user's sketching input. Our method robustly constructs a polyline mesh that represents the slender parts using the screen-space shortest path analysis that can be efficiently solved using dynamic programming. We demonstrate the effectiveness of our approach in several in-the-wild examples.

翻译：细长弹性物体的物理模拟通常需要将其离散化为折线。然而，从高斯溅射构建折线具有挑战性，因为高斯溅射缺乏连通性信息，且高斯基元的配置包含大量噪声。本文提出了一种方法，能够根据用户的草图输入，从高斯溅射场景中提取物体细长部分的折线表示。我们的方法通过屏幕空间最短路径分析（该问题可利用动态规划高效求解），稳健地构建了表示细长部分的折线网格。我们在多个真实场景示例中验证了该方法的有效性。