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Chipmunk Physics • View topic - 20,000 particles + bullet in real time

20,000 particles + bullet in real time

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20,000 particles + bullet in real time

Postby slembcke » Sun Oct 05, 2008 2:00 pm

Thought some might find this amusing. I made the following movie this weekend when working on other Chipmunk stuff. Just under 20,000 particles forming the shape of the Chipmunk logo.

http://files.slembcke.net/temp/logo_bullet.swf

For those that are wondering, it really is a real-time screen capture on my Macbook Pro. Go-go spatial hashing! :D
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Re: 20,000 particles + bullet in real time

Postby maximile » Sun Oct 05, 2008 2:37 pm

That's pretty amazing! When I try 20,000 circles (on a MBP) it takes 3.5s per frame, but that's without playing with any of the hash settings. Also I imagine having everything the same size helps a lot. Did you make any other clever optimisations?
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Re: 20,000 particles + bullet in real time

Postby slembcke » Sun Oct 05, 2008 6:18 pm

No, not other than setting the hash size to match the particle size. If left on the defaults, it did indeed run very very slowly. Several seconds per frame I would say.

Someday I'll get around to hierarchical spatial hashes I swear. :-|
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Re: 20,000 particles + bullet in real time

Postby ker » Mon Oct 06, 2008 2:38 am

Wow, that is cool!

You don't happen to object to me copying that as a logo in the loader for my game instead of the chipmunk png-logo. (By copy I mean actually use chipmunk, I want to be free of resolution bounds ;) )
I think something like that is the perfect logo for a physics engine :)
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Re: 20,000 particles + bullet in real time

Postby slembcke » Mon Oct 06, 2008 3:42 am

Sure, I don't see why not. You might need to slim it down a bit though. I was barely able to get 15fps on a fairly newish penyryn Core 2 Duo. I'll probably add it to the official list of demos soonish.
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Re: 20,000 particles + bullet in real time

Postby ker » Mon Oct 06, 2008 5:20 am

Well... I can make it resolution dependent... ppl with low pc's won't use high res... mostly :)

hmm... I can't seem to find a good setting for the hash cell size, exactly the diameter of the circles(8.0) is not as good as 10.0, and higher numbers cause a loss of fps again. Higher numbers are better once the logo breaks up.

30 fps, huge hash cell number

30-40 fps, 7000 hash cells for 6149 particles
Last edited by ker on Mon Oct 06, 2008 11:55 am, edited 2 times in total.
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Re: 20,000 particles + bullet in real time

Postby sickman » Mon Oct 06, 2008 9:52 am

Whoa! You surely got a very beefy computer!
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Re: 20,000 particles + bullet in real time

Postby MatthewHudghton » Mon Oct 06, 2008 8:53 pm

wow thats cool
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Re: 20,000 particles + bullet in real time

Postby mwmerlo » Thu Oct 16, 2008 3:27 pm

What program did you use for the screen capture? All the screen capture tools I use would have problems making that video.
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Re: 20,000 particles + bullet in real time

Postby slembcke » Thu Oct 16, 2008 7:56 pm

Can't sleep... Chipmunks will eat me...
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