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### Course: Pixar in a Box>Unit 7

Lesson 1: Introduction to particle systems

# Effects overview

Pixar effects artists create realistic water using particles and simulations. They apply forces like wind and gravity to particles, making water interact with characters and scenes. Learn how to make water and more for animated films with particles and simulations, making stories come alive!

## Want to join the conversation?

• What grade is this topic generally for?
• Any age! It doesn't matter what grade you're in!
It only matters if you enjoy and want to do it. Everyone can do what they want to do.
• How long did it take for the Pixar animator to create the water in each scene?
• it depends greatly on the shot. I can set up a simple water sim in a few minutes not counting the 3d scene it lives in. Or it can take hours to set up the sim. If the sim is just allowed to be a real sim based on real world physics thats easier than a sim that has to look real but I need to control the final look of the sim to achieve a specific effect or look. Thats because you are adding more math to the equation.
• At anybody else see a white dot and a beep?
• Yes, its so RANDOM!
• how long did finding nemo take to create all the water?
• Why this dude wearing his glasses in the water? Everyone who wears glasses knows not to do that! Duh!(I should know. I wear glasses.)
• What is the hardest effect to simulate?
• Hair sims can usually bunch groups of hair to follow a single hair. So it depends on how big in the shot the hair will be as final as to how small those groups will be. Closer to camera, less splines per group.

Water works the same way so it again will depend on level of realism needed, what its interacting with and how accurate that interaction needs to be for a given shot.

So the answer it Depends on the level of detail and desired accuracy of the physical simulation. The Black hole in Interstellar was pretty crazy long sim.
• Wouldn't the computers struggle with all the amounts of particles?
• I believe the way that movies are created helps eliminate this problem. Pixar along with other big studios use rendering farms in order to output the videos that you see. Unlike video games that run and process in real-time as you play. Movies require hours or sometimes days of rendering every frame and recalculating and rendering frame by frame until they have the frames of the movie.
http://www.slashfilm.com/cool-stuff-a-look-at-pixar-and-lucasfilms-renderfarms/
• What was that white dot at ?
• How long does it take to animate all those particles?