This project is an implementation of Position Based Fluids[1] written in CUDA and modified Screen Space Fluids Rendering[2] written in OpenGL.

Double Dam Break 32K particles

See figs for additonal screenshots of single dam, surface normal map and sweeping boundary scene.

Techniques

• Imcompressible fluids simulation using Macklin[1]. Vorticity confinement is not implemented.
• Screen space surface reconstruction based on Laan[2].
• Surface smoothed by applying bilateral filter on depth texture.
• GPU particle neighbor searching using Green[3].
• GUI using NanoGUI. Talk with wjakob last year inspired me for this project.

Evaluation

Performance evaluated on a notebook with GTX 1050, i7-7700 HQ.

Under configuration of 4 incompressibility confinement iterations and 2 smoothing iterations each frame, this implementation runs at ~30 fps with 32K particles in Double Dam Break scene (Screenshots above).

• CUDA 9.1
• Visual Studio 2017 15.4.5.
  Higher version fails to build CUDA 9, as of 15.7.3.
  See Microsoft vcpkg Github issue.
• GPU and driver support OpenGL 4.5

Apache License 2.0 (Apache-2.0)

[1] M. Macklin and M. Müller, “Position based fluids,” ACM Trans. Graph., vol. 32, no. 4, p. 1, Jul. 2013.
[2] W. J. van der Laan, S. Green, and M. Sainz, “Screen space fluid rendering with curvature flow,” in Proceedings of the 2009 symposium on Interactive 3D graphics and games - I3D ’09, 2009, p. 91.
[3] S. Green, “Particle Simulation using CUDA,” cse.uaa.alaska.edu, no. September, pp. 1–12, 2013.
[4] Learn OpenGL, extensive tutorial resource for learning Modern OpenGL for great skybox tutorial.