Raindrop on Moving Object

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Raindrop on Moving Object

• By Susu LI

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Motivations

• Rain is the most common weather phenomena
• Photorealistic rain will greatly enhances the
  scenes of outdoor reality

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State of Art

• Direct physical simulation
• ATIs ToyShop demo 1
• Yoshihiko2
• Image-based rain
• Starik and Werman 3
• Detect and then remove rain from videos
• Garg and Nayar 4
• Other approaches
• Wang and Mucha 5

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Challenges

• Current results are repetitious and not
  realistic
• Animate the effects with moving object (a car? ?)

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Proposed Tasks

• Short term
• i) A single raindrop with plausible visual
  results
• ii) Effects with a moving object
• Long term
• Simulate rainfall
• Potential Extension
• GPU based

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Tentative Approaches

• Using particle system
• Animate the particles over time, applying forces
  such as wind and gravity
• Splash effect
• Particle level set method 6
• Finite Element Analysis 7

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Timeline

• 04/07/2009
• - short term goal i, possible ii
• 05/05/2009
• - long term goal

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Reference

• 1 ATI Demo. Artist-directable real real-time
  rain rendering in time rain rendering in city
  environments. http//www.ati.com/developer/techpap
  ers.htmlgdc06, 2006.
• 2 T. Yoshihiko, K. Kensuke, and T. Katsumi. A
  method for rendering realistic rain-fall
  animation with motion of view. In IPSJ SIGNotes
  Computer Graphics and CAD Abstract, pages105005,
  2001.
• 3 S. Starik and M. Werman. Simulation of rain
  in video. In Proceedings of the 3rd Intl
  Workshop on Texture Analysis and Synthesis, pages
  95100, 2002.
• 4 K. Garg and S.K. Nayar. Detection and removal
  of rain from videos. In Proceedings of CVPR 2004,
  volume 1, pages 528535, 2004.
• 5 H. Wang, P.J. Mucha, and G. Turk. Water drops
  on surfaces. ACM Trans. on Graphics (SIGGRAPH),
  24921929, 2005.
• 6 ENRIGHT, D., NGUYEN, D., GIBOU, F., AND
  FEDKIW, R. 2003. Using the particle level set
  method and a second order accuratepressure
  boundary condition for free surface flows.
  InProceeding of the 4th ASME-JSME Joint Fluids
  Eng. Conf.,FEDSM2003-45144, 16.
• 7 FENG, Z. G., DOMASZEWSKI, M., MONTAVON, G.,
  AND CODDET, C. 2002. Finite element analysis of
  effect of substrate surfaceroughtness on liquid
  droplet impact and flattening process.Journal of
  Thermal Spray Technology 11, 1, 6268.