Flow-noise en temps réel

Aymeric Augustin, Fabrice Neyret
Technical Report , École polytechnique - Evasion, laboratoire GRAVIR - juin 2006
Download the publication : Flow-noise_temps_reel.pdf [5.4Mo]  

Procedural textures, such as Perlin noise, enable us to achieve high quality, resolution independant static effects. Our research aims at providing real-time animation for such noise. Thus, we can enhance the apperance of fluids — especially geophysical fluids such as clouds, fire, water, lava, mud, etc. — by adding animated noise at small scales.

To achieve a realistic appearance, we must give the feeling of the flowing and swirling that are caracteristic of real flows. Flowing is obtained with advected textures, linked to a fluid solver. The main part of our work is simulating the swirling of the flow. We use flow-noise to add rotation to Perlin noise. Using a local measure of vorticity and Kolmogorov theory, we determine the amount of animation in the fluid at different scales. This ensures that our flow-noise has a physically correct spectrum.

Computing flow-noise is quite intensive ; however, we show how real-time framerates can be achieved with current GPUs. We highlight a number of GPU-specific issues and optimisations for our algorithm, and we include complete source code and documentation for our pixel shader.

Images and movies


See also

Shader source-code (see the report for more documentation).
Slides of an early presentation (in english).
Slides of the final presentation (in french).
Fabrice Neyret's work on advected textures and on flow-noise.

BibTex references

  author       = "Augustin, Aymeric and Neyret, Fabrice",
  title        = "Flow-noise en temps r\'eel",
  institution  = "École polytechnique - Evasion, laboratoire GRAVIR",
  month        = "juin",
  year         = "2006",
  type         = "Rapport de stage d'option",
  keywords     = "flow-noise, textures, advected, procedural, real-time",
  url          = "http://evasion.imag.fr/Publications/2006/AN06"

Other publications in the database

in lab LJK base , in team EVASION base
» Fabrice Neyret : in lab LJK base , in team EVASION base