Abstract Realistic and detailed liquid splashes require costly fine-scale discretization. We present an efficient post-processing approach for particle-based methods to locally improve the behavior of splashes on coarser liquids. Our method first computes a splash volume over time from the intersections between an identified upsampling volume and colliding volumes. We then upsample particles inside cells of the splash volume; these cells are pre-computed using a likelihood score based on criteria favoring emerging particles. In addition to the advection scheme, enhanced realism is achieved by applying a localized artificial pressure on upsampled particles in order to mimic surface tension in critical regions of splashes. Finally, we propagate waves using a novel implicit model that couples the impact of upsampled particles on the coarser liquid by updating the velocity field at these locations. Our implicit wave model can produce detailed swirls by solely applying velocity updates directly on the underlying particles from the coarse liquid, and prevents from using a high density of surface points. As a result, our approach can generate localized and parameterizable high-resolution splashes from solid-liquid and liquid-liquid interactions, and thus can simulate a wide range of unique and customizable splashes on top of an animated coarse liquid.

中文翻译：

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粒子上采样作为一种灵活的后处理方法来增加飞溅液体动画的细节

摘要 逼真和详细的液体飞溅需要昂贵的精细尺度离散化。我们为基于粒子的方法提出了一种有效的后处理方法，以局部改善较粗液体上的飞溅行为。我们的方法首先从识别的上采样体积和碰撞体积之间的交叉点计算随时间的飞溅体积。然后我们对飞溅体积单元内的粒子进行上采样；这些细胞是使用基于有利于新兴粒子的标准的似然分数预先计算的。除了平流方案外，还通过对上采样粒子施加局部人工压力来模拟飞溅关键区域的表面张力，从而增强真实感。最后，我们使用一种新颖的隐式模型传播波，该模型通过更新这些位置的速度场来耦合上采样粒子对较粗液体的影响。我们的隐式波模型可以通过直接在粗液体的底层粒子上直接应用速度更新来产生详细的漩涡，并防止使用高密度的表面点。因此，我们的方法可以从固-液和液-液相互作用中生成局部和可参数化的高分辨率飞溅，从而可以在动画粗糙液体的顶部模拟各种独特且可定制的飞溅。并防止使用高密度的表面点。因此，我们的方法可以从固-液和液-液相互作用中生成局部和可参数化的高分辨率飞溅，从而可以在动画粗糙液体的顶部模拟各种独特且可定制的飞溅。并防止使用高密度的表面点。因此，我们的方法可以从固-液和液-液相互作用中生成局部和可参数化的高分辨率飞溅，从而可以在动画粗糙液体的顶部模拟各种独特且可定制的飞溅。