research-article

Loki: a unified multiphysics simulation framework for production

Authors:

Alexey Stomakhin,

Eston Schweickart,

Andrew MoffatAuthors Info & Claims

ACM Transactions on Graphics (TOG), Volume 41, Issue 4

Article No.: 50, Pages 1 - 20

https://doi.org/10.1145/3528223.3530058

Published: 22 July 2022 Publication History

Abstract

We introduce Loki, a new framework for robust simulation of fluid, rigid, and deformable objects with non-compromising fidelity on any single element, and capabilities for coupling and representation transitions across multiple elements. Loki adapts multiple best-in-class solvers into a unified framework driven by a declarative state machine where users declare 'what' is simulated but not 'when,' so an automatic scheduling system takes care of mixing any combination of objects. This leads to intuitive setups for coupled simulations such as hair in the wind or objects transitioning from one representation to another, for example bulk water FLIP particles to SPH spray particles to volumetric mist. We also provide a consistent treatment for components used in several domains, such as unified collision and attachment constraints across 1D, 2D, 3D deforming and rigid objects. Distribution over MPI, custom linear equation solvers, and aggressive application of sparse techniques keep performance within production requirements. We demonstrate a variety of solvers within the framework and their interactions, including FLIPstyle liquids, spatially adaptive volumetric fluids, SPH, MPM, and mesh-based solids, including but not limited to discrete elastic rods, elastons, and FEM with state-of-the-art constitutive models. Our framework has proven powerful and intuitive enough for voluntary artist adoption and has delivered creature and FX simulations for multiple major movie productions in the preceding four years.

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Cited By

Flynn SStomakhin AWretborn JWhite D(2024)Art Directable Underwater Explosion SimulationACM SIGGRAPH 2024 Talks10.1145/3641233.3664314(1-2)Online publication date: 18-Jul-2024
https://dl.acm.org/doi/10.1145/3641233.3664314
Takahashi TBatty C(2023)A Multilevel Active-Set Preconditioner for Box-Constrained Pressure Poisson SolversProceedings of the ACM on Computer Graphics and Interactive Techniques10.1145/36069396:3(1-22)Online publication date: 24-Aug-2023
https://dl.acm.org/doi/10.1145/3606939
Shi AWu HParr JDarke AKim T(2023)Lifted CurlsProceedings of the ACM on Computer Graphics and Interactive Techniques10.1145/36069206:3(1-19)Online publication date: 24-Aug-2023
https://dl.acm.org/doi/10.1145/3606920
Show More Cited By

Index Terms

Loki: a unified multiphysics simulation framework for production
1. Computing methodologies
  1. Computer graphics
    1. Animation
      1. Physical simulation
  2. Modeling and simulation
    1. Simulation types and techniques

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cover image ACM Transactions on Graphics

ACM Transactions on Graphics Volume 41, Issue 4

July 2022

1978 pages

ISSN:0730-0301

EISSN:1557-7368

DOI:10.1145/3528223

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Copyright © 2022 ACM.

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Publication History

Published: 22 July 2022

Published in TOG Volume 41, Issue 4

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Cited By

Flynn SStomakhin AWretborn JWhite D(2024)Art Directable Underwater Explosion SimulationACM SIGGRAPH 2024 Talks10.1145/3641233.3664314(1-2)Online publication date: 18-Jul-2024
https://dl.acm.org/doi/10.1145/3641233.3664314
Takahashi TBatty C(2023)A Multilevel Active-Set Preconditioner for Box-Constrained Pressure Poisson SolversProceedings of the ACM on Computer Graphics and Interactive Techniques10.1145/36069396:3(1-22)Online publication date: 24-Aug-2023
https://dl.acm.org/doi/10.1145/3606939
Shi AWu HParr JDarke AKim T(2023)Lifted CurlsProceedings of the ACM on Computer Graphics and Interactive Techniques10.1145/36069206:3(1-19)Online publication date: 24-Aug-2023
https://dl.acm.org/doi/10.1145/3606920
Stomakhin ALesser SWretborn JFlynn SNixon JIllingworth NRollet ABlom KMchale D(2023)Pahi: A Unified Water Pipeline and ToolsetProceedings of the 2023 Digital Production Symposium10.1145/3603521.3604291(1-13)Online publication date: 5-Aug-2023
https://dl.acm.org/doi/10.1145/3603521.3604291
Daviet G(2023)Interactive Hair Simulation on the GPU using ADMMACM SIGGRAPH 2023 Conference Proceedings10.1145/3588432.3591551(1-11)Online publication date: 23-Jul-2023
https://dl.acm.org/doi/10.1145/3588432.3591551
Droske MHanika JVorba JWeidlich ASabbadin MBrunvand E(2023)Path tracing in Production: The Path of WaterACM SIGGRAPH 2023 Courses10.1145/3587423.3595519(1-66)Online publication date: 24-Jul-2023
https://dl.acm.org/doi/10.1145/3587423.3595519
Qiu YReeve SLi MYang YSlattery SJiang C(2023)A Sparse Distributed Gigascale Resolution Material Point MethodACM Transactions on Graphics10.1145/357016042:2(1-21)Online publication date: 16-Jan-2023
https://dl.acm.org/doi/10.1145/3570160
Wretborn JFlynn SStomakhin A(2022)Guided bubbles and wet foam for realistic whitewater simulationACM Transactions on Graphics10.1145/3528223.353005941:4(1-16)Online publication date: 22-Jul-2022
https://dl.acm.org/doi/10.1145/3528223.3530059

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