Comments on: Add Radial Gravity to Box2D

By: Oliver

Oliver — Sat, 26 Nov 2011 05:41:47 +0000

Hey, I was looking to implement radial gravity physics and this is exactly what i needed. Thanks very much, the simplicity of your solution is fantastic.

By: Joel

Joel — Wed, 28 Sep 2011 10:50:37 +0000

This is great, just what we were looking for for a project we are working on. Many thanks man!

By: mark

mark — Sat, 07 May 2011 12:28:54 +0000

thanks so much. i was actually working on something like this for my app.

By: Joseph Le Brech

Joseph Le Brech — Wed, 26 Jan 2011 13:11:39 +0000

This what I gathered from your tutorial while converting it to Lua for love2d and hump.

ship = bodies[1]
shipVec = vector(ship:getX(),ship:getY())
planet = bodies[2]
planetVec = vector(planet:getX(),planet:getY())

distance = planetVec – shipVec

force = 250 / distance:len2()
normforce = force*distance
bodies[1]:applyImpulse(normforce.x, normforce.y,ship:getX(),ship:getY())

By: myrddin

myrddin — Wed, 19 Jan 2011 09:21:41 +0000

Thank you, very useful !
If I want add other planets (with gravity), do I need multiply or add forces ?
Thank you.

By: MD

MD — Fri, 31 Dec 2010 03:08:25 +0000

Hey Nick,

Great post! Lovely use of physics. Wondering if you might share the source in the video at the bottom of the post?

Cheers,
//MD

By: winan

winan — Sun, 07 Nov 2010 12:21:48 +0000

I just sent this post to a bunch of my friends as I agree with most of what you’re saying here and the way you’ve presented it is awesome.

By: Berry

Berry — Sun, 07 Nov 2010 06:49:27 +0000

You certainly deserve a round of applause for your post and more specifically, your blog in general. Very high quality material

By: Anonymous

Anonymous — Wed, 27 Oct 2010 18:25:13 +0000

You saved the day. I looked all over for how to do this. You are right, it is so simple once you figure it out! THANK YOU

By: aparadekto

aparadekto — Tue, 26 Oct 2010 10:31:27 +0000

Hey, I can’t view your site properly within Opera, I actually hope you look into fixing this.