[Game] FluidToy « cocos2d for iPhone

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[Game] FluidToy

(13 posts) (6 voices)

Started 1 year ago by Lars
Latest reply from Lars

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Lars
Member

Hi everyone,
I just started developing for fun for the iPhone and FluidToy is my first output released to the AppStore: http://itunes.apple.com/us/app/fluidtoy/id363572062?mt=8

FluidToy is a small iPhone / iPod Touch application that turns your device into an interactive fluid simulation.

Use your fingers to stir in the fluid or add streams that set the fluid into a smooth flow. Create colored particle emitters that go with the flow and choose from four different background modes.

You’ll find it quite relaxing after a while…

Coming from an Actionscript world Cocos2D a lot of times felt familar... and thanks to all in the forum that answered my questions. I'm looking forward to produce something more "serious" ;). Enjoy.

Cheers,
Lars

Posted 1 year ago #
JonKean
Member

Pretty cool! Did you use a physics engine or handle the simulation code yourself? You should look into getting OS 3.0 supported (or even better, 2.2.1). If you're looking to monetize the app, you could go with in app advertising (or promote other apps you might release in the future).

Posted 1 year ago #
ddeaco
Member

wow very impressive how much is in cocos2D?

Posted 1 year ago #
Lars
Member

Thanks ;)
The menus are pure Cocos2D, but the particle system and the distortable background graphic are selfmade objects based on a CCNode. The background is basically just a textured grid and I modify the texture coordinates to achieve the distortion effect.

The fluid simulation is based on a paper from Jos Stam (http://dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf), with a few performance optimizations to get it to work on the iPhone with a decent framerate.

... and update with more features will follow soon.

Posted 1 year ago #
ddeaco
Member

cool, cant wait to see any new features. Cant seem to get your link to work :(

Cocos2D is amazing, but i cant help but think i should really learn some core openGL, do you have any recommended reading for a beginner?

Thank Dave.

Posted 1 year ago #
Lars
Member

@ddeaco: I think the OpenGL redbook is the best introduction to the world of OpenGL: http://www.opengl.org/documentation/red_book/

Posted 1 year ago #
mithril
Member

Hi Lars,

Could you elaborate on how to subclass the CCNode to produce the particle system?

Thanks
Matthew

Posted 1 year ago #
zariok
Member

In looking this up the link to the Jos Stam paper is incorrect, please find it here:

http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf

OP: Are you willing to post code for a sample project on the CCNode implementation?

Posted 1 year ago #
mithril
Member

I'm interested in the sample code too. It would be really good to see how this is done.

Posted 1 year ago #
Lars
Member

The particle system isn't magic. Just take a look at the CCParticleSystem and CCPointParticleSystem of Cocos2D. My particle system is built the same way as the Cocos ones, but with just a few modifications that fitted my needs. With my particle system I can set and modify the velocity of each particle in each frame, that's it.

For the fluid grid have a look at this java implementation: http://www.multires.caltech.edu/teaching/demos/java/stablefluids.htm ... just crazy math ;).

Posted 1 year ago #
mithril
Member

The java example makes use of a grid and paints in the pixels. How can that idea be translated to a particle system?

Posted 1 year ago #
charlieapp
Member

@Lars your app is amazing was showing it to some coworkers today.

I've been trying to implement that tam paper on iPhone without success so far.

Posted 1 year ago #
Lars
Member

@mithril: For every fluid cell in the grid you have a velocity and a density. I make use of the velocity in every cell to modify the particles velocity. That's it. In the java example, he paints the density as big pixel blocks.

Posted 1 year ago #

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