Computer modelling of fallen snow

P. Fearing
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引用次数: 90

Abstract

In this paper, we present a new model of snow accumulation and stability for computer graphics. Our contribution is divided into two major components, each essential for modelling the appearance of a thick layer of snowfall on the ground. Our accumulation model determines how much snow a particular surface receives, allowing for such phenomena as flake flutter, flake dusting and wind-blown snow. We compute snow accumulation by shooting particles upwards towards the sky, giving each source surface independent control over its own sampling density, accuracy and computation time. Importance ordering minimises sampling effort while maximising visual information, generating smoothly improving global results that can be interrupted at any point. Once snow lands on the ground, our stability model moves material away from physically unstable areas in a series of small, simultaneous avalanches. We use a simple local stability test that handles very steep surfaces, obstacles, edges, and wind transit. Our stability algorithm also handles other materials, such as flour, sand, and flowing water.
落雪的电脑模拟
在本文中,我们提出了一种新的雪的积累和稳定性的计算机图形模型。我们的贡献分为两个主要部分,每个部分对于模拟地面上厚层降雪的外观至关重要。我们的积累模型决定了一个特定的表面接收了多少雪,考虑到雪花飘动、雪花飞扬和风吹雪等现象。我们通过向天空发射粒子来计算积雪,让每个源表面独立控制自己的采样密度、精度和计算时间。重要性排序最小化采样努力,同时最大化视觉信息,产生平滑改进的全局结果,可以在任何点中断。一旦雪降落在地面上,我们的稳定性模型就会在一系列同时发生的小雪崩中将物质从物理不稳定的区域移走。我们使用一个简单的局部稳定性测试来处理非常陡峭的表面、障碍物、边缘和风的传输。我们的稳定性算法还处理其他材料,如面粉、沙子和流动的水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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