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Index › Programming Questions & Help › Programs › Magnetic Field Lines
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Magnetic Field Lines (Read 1446 times)
pokoto
Magnetic Field Lines
Aug 29th, 2009, 2:09pm  
Hey, I'm trying to trace magnetic field lines between a variable number of magnetic poles. I've tried a few things with particles and while it looks cool it isn't as speedy nor as explicit as simply drawing the lines. But, I can't think of how to do it for the life of me.

Here is an applet that is able to do what I want (I can't seem to post the URL so it is a bit jumbled) : falstad.com/vector3dm/

I can't make heads or tails of it though; all I've figured out so far is that it has to do with the genLines and drawLines function. Does anyone have an idea how to do this, or can maybe make sense of that applet?
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luke
Re: Magnetic Field Lines
Reply #1 - Sep 1st, 2009, 3:34pm  
I think what you're really looking for is the function that yields the magnetic field vector given a point in space.  If you can get a function of (x,y) that returns the magnitude and direction of the field, then it's just a matter of drawing lines.  I'd suggest searching wikipedia or any physics textbook.
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Cedric
Re: Magnetic Field Lines
Reply #2 - Sep 1st, 2009, 3:56pm  
toxi just made some... they look amazing http://www.flickr.com/photos/toxi/sets/72157620899002878/
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... twitter.com/CedricKiefer
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Cedric
Re: Magnetic Field Lines
Reply #3 - Sep 1st, 2009, 3:57pm  
they are probably based on some of his older sketches that are still online http://toxi.co.uk/p5/fieldlines/
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... twitter.com/CedricKiefer
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ben_hem
Re: Magnetic Field Lines
Reply #4 - Sep 1st, 2009, 9:10pm  
Those are *beautiful.*  I'm most attracted to the early sketch you just linked.  --Ben

PS: recompiled with OpenGL mode, for fun.  Very fast.

http://benhem.com/dev/gravityFields
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Cedric
Re: Magnetic Field Lines
Reply #5 - Sep 1st, 2009, 10:03pm  
true, i really love em too
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