Tag archives: cinema
By James Dacey
This summer many of you will watch smoke billowing out of buildings as yet another villain wreaks havoc on the New York skyline in the latest Hollywood blockbuster. I’m willing to bet that as you eat your popcorn you won’t be thinking about the Navier–Stokes equations of fluid dynamics. (Well, perhaps you will now that I’ve mentioned it!)
In fact, part of the reason that virtual smoke in films looks so realistic is because visual effects (VFX) specialists have applied the Navier–Stokes equations to their graphics. This was one of the interesting tidbits I learned from a talk yesterday in London by Rob Pieké, head of software at Moving Picture Company (MPC).
Pieké was speaking as part of a half-day event on “physics and film” organized by the Institute of Physics, which publishes Physics World. The gist of his presentation was that basic physics principles are used in a variety of ways to create special effects that capture viewers’ attention. “The audience wants to see something fantastical but grounded in reality,” said Pieké. Another example he gave was how naturally bouncing hair in computer-generated characters is modelled on mass—spring systems. Each individual hair could be modelled on as many as 30 masses connecting by springs.