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  • #: 158285
  • Price: free ($0.00) In Apple Store
  • Category: Education
  • Updated: 2010-06-02
  • Current Version: 1.0
  • 1.0
  • Size: 1.50 MB
  • Language: English
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 3.0 or later
  • © 2010 Dan Bourque
  •  Add to Favorite apps



The numbers are in for June! Pendulums is:

#11 ranked app in Entertainment for iPad!

#24 ranked app in Entertainment for iPhone!

For people who like to stare at shiny objects. :o)

Pendulums is an amazing interactive physics simulation of the classic Double Pendulums system, where one pendulum is attached to the end of another.

It is mesmerizing to watch the beautiful patterns that occur naturally, and you can control the fire, tail length, material, and simulation speed. It also responds to gravity, but currently only along the vertical axis. (I'm working on it). Try making the pendulum swing rapidly, and then place the device on a flat surface; you'll be amazed at the unexpected results!

For fellow nerds that are interested in its implementation details, I use the Runge-Kutta method for solving the differential equations for each simulation step. I then render in OpenGL, but I implemented a clever technique to rapidly render the tail as a solid object, complete with specular highlights, shadows, and light diffusion. It isn't perfect yet, but I'm still tweaking it to make it look even smoother.

Future version will allow you to control each mass's weight, and each arm's length. I also plan on adding different particle systems emitters, such as smoke, and different materials for the dynamic tail. If you have any improvement suggestions, please let me know!

View iPhone screenshots | View iPad screenshots

iPhone Screenshots

Pendulums iPhone Screenshot 1

iPad Screenshots

Pendulums iPad Screenshot 1
Pendulums iPad Screenshot 2

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The information may be outdated (2011-04-18 13:39:38). For actual information go to iTunes

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