Novel fluid detail enhancement based on multi‐layer depth regression analysis and FLIP fluid simulation

Abstract

In this paper, we propose a novel integrated method for effective modeling and realistic enhancement of scale-sensitive fluid simulation details. The core of our method is the organic of multi-layer depth image regression analysis and fluid implicit particle fluid simulation of which the regression analysis induces the criterion where the fluid details should be produced. First, we capture the depth buffer of the fluid surface dynamically from the top of scene. Second, we employ depth peeling technique to decompose the target fluid volume into multiple depth layers and conduct time-space analysis over surface layers. Third, we propose a logistic regression-based model to rigorously pinpoint the complex interacting regions, wherein multiple detail-relevant factors are taken into account based on the captured multiple depth layers. Finally, details are enhanced by animating extra diffuse materials and augmenting the air-fluid mixing phenomenon. It is evident that, with depth peeling technology, we can afford rigorous analysis not only across surface layers at different fluid depth but along the depth direction as well. After integrating the analysis results from these two sources, we are capable of performing detail enhancement both on the fluid surface and inside the fluid to obtain a great visual effect, even when large occlusion exists. Directly benefiting from the flexibility of image-space-dominant processing, our unified framework can be entirely implemented on graphics processing units and thus achieves interactive performance. For various fluid phenomena with different diffuse materials (e.g., spray, foam, and bubble), comprehensive experiments and evaluations have demonstrated its superiority in high-fidelity fluid detail enhancement and its interaction with surrounding environment. KEYWORDS depth peeling, FLIP, fluid detail enhancement, GPU, image space method, time-space analysis model

Synthesizing Large‐Scale Fluid Simulations with Surface and Wave Foams via Sharp Wave Pattern and Cloudy Foam

“…As mentioned earlier, secondary effects in particle‐based fluids are calculated by analyzing the motion of particles in 3D space (e.g., curvature) 2,26 . There are also techniques for processing based on 2D image‐space to reduce the amount of computation that increases as the number of particles increases (e.g., depth map) 18,19,25 . Since these techniques are based on 2D, the calculation speed is significantly faster, but awkward motion occurs due to the disparity between the 2D and 3D spaces.…”

“…Since these techniques are based on 2D, the calculation speed is significantly faster, but awkward motion occurs due to the disparity between the 2D and 3D spaces. Qiu et al 25 used multiple depth maps to reduce the disparity between 2D and 3D spaces, but it is still impossible to express surface foam, and the quality of the foam is degraded by clumping movements, and it operates unstable even in occluded regions.…”

“…Qiu et al 25 proposed a framework that can express different diffuse materials (e.g., spray, foam, and bubble) expressed in water simulation using multiple depth layers. They tried to save computational cost by using 2D image‐space, similar to our method, and actually show faster results than approaches that compute in a three‐dimensional (3D) environment.…”

Post-Processing Framework for Enhancing Liquid Surfaces in VFX Pipeline

“…There was no significant improvement in terms of visual quality except that additional splash particles were added when a specific impact occurred and used for water surface generation rather than secondary particles. Finally, it is a method of adding secondary effects such as splash, foam, and bubble, which are difficult to express with SPH water particles alone [59]- [62]. This method expresses features such as splash and foam that are common in largescale fluids, but focuses on improving secondary effects rather than detail on water surfaces.…”

“…An in-house solution is essential because splash, foam, and bubble particles must be advected based on the underlying particle simulation. These techniques focus on creating natural splashes based on impact, motion flowing along with underlying water [59], [61], [62], and foam patterns [60] rather than surface details such as liquid sheets. However, these and our goals are different, but adding secondary effects to our method of improving the visual quality of water surfaces can be used in large-scale fluids scenes as well.…”