Color Mixing using Colliding Particles
The use of simulation to apply virtual paint to virtual paper can take many forms ranging from Pollock-style drip paintings to simulated watercolor techniques to paint program airbrush tools. We use physically based modeling to simulate streams of encapsulated paint particles. When set in motion, particles are subject to an artificial gravity, and melt when they contact a virtual canvas. By incorporating algorithmic art methods, and by taking advantage of the scattering effects that result from particle collisions, we explain how we created a series of color studies using colliding particles organized into carefully orchestrated streams of simulated paint droplets.
 C. Curtis, S. Anderson, K. Fleischer, and D. Salesin, Computer-generated watercolor, ACM SIG- GRAPH 97 Conference Proceedings, 421–430, 1997.
 J. Eggers and T. Dupont, Drop formation in a one dimensional approximation of the Navier-Stokes equation, Journal of Fluid Mechanics, 262, 205–221, 1994.
 Electronic airbrushing - US Patent 5131056, 1992.
 G. Greenfield, Evolutionary computation for aesthetic purposes involving interacting particle simula- tion, WCCI 2008 Conference Prooceedings, to appear.
 P. Haeberli, Paint by numbers: abstract image representations, Computer Graphics, 24(4), 207–214, August 1990.
 K. Jones-Smith and H. Mathur, Revisiting Pollock’s drip paintings, Nature, 444(7119), 9–10, Novem- ber, 2006. Available on-line at http://www.nature.com/nature/journal/v444/n7119/full/nature05398.html (accessed November 2007).
 S. Lee et al., Simulating and analyzing Jackson Pollock’s paintings, Journal of Mathematics and the Arts, 1(2), 73–83, 2007.
 J. Rehmeyer, Fractal of fake? Novel art-authentication method is challenged, Science News, 171(171), 122–122, February 24, 2007. Available on-line at http://www.sciencenews.org/articles/20070224/bob9.asp (accessed November, 2007).
 R. Taylor et al. , Authenticating Pollock paintings using fractal geometry, Pattern Recognition Let- ters, 28(6), 695–702, 2007. Available on-line at http://materialscience.uoregon.edu/taylor/art/TaylorSubmission.pdf (accessed November 2007).
 R. Taylor et al. , Fractal Analysis: Revisiting Pollock’s drip paintings (Reply), Nature, 444(7119), 10-11, November, 2006.
 Watercolor simulation in computer graphics - US Patent 5432896, 1995.