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Implicit Position-Based Fluids (IPBF)

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Elie Diaz, Jerry Hsu, Eisen Montalvo-Ruiz, Chris Giles, Cem Yuksel

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Description

Implicit Position-Based Fluids (IPBF) presents a Utah Graphics Lab incompressible SPH method by Elie Diaz, Jerry Hsu, Eisen Montalvo-Ruiz, Chris Giles, and Cem Yuksel that uses second-order implicit descent on a variational energy aimed at near-incompressibility with strong stability.

It compares IISPH, DFSPH, PBF, and SISPH on stability versus compression and noise, and reports unconditional stability under extreme time steps for interactive use. Figures and a fast-forward video illustrate the differences.

It is for advanced simulation programmers implementing SPH or position-based fluids. Background in incompressible constraints and time integration helps.

The project page is free, with abstract, comparative results, video, and a publications section for the formal paper.

It is useful when balancing incompressibility and stability without classic PBF over-compression or unstable velocity-based solvers. Link last verified accessible on 2026-09-29. Link last verified accessible on 2026-09-28.