Questions tagged [box2d]

Box2D is an open-source rigid-body 2D physics simulation library for games, written in C++, with ports in various languages

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9 votes
1 answer
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How can I copy or back-calculate definitions for an entire b2World?

I'm working on a platformer where I'd like to be able to move or copy bodies between multiple Box2D b2Worlds. The desire has cropped up three times now - moving objects between documents in my editor, ...
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9 votes
2 answers
5k views

Box 2D Set Origin

I'm trying to set the origin of a box2d shape. By default, a shape rotates around the center. But I'm trying to get it to rotate around the left of the shape. Like a clock for example. I've heard of ...
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2 votes
1 answer
1k views

cocos2d: syncing CCAnimation frames with Box2d Shape manipulations

my cocos2d game currently has a ccsprite attached to a box2d body. during the game i apply different CCAnimations on my sprite, i would like to perform certain manipulations to the box2d body ...
Jorge Cohen's user avatar
4 votes
1 answer
953 views

Problem with box2d at beggining

I have problem with simple box2d physics: I have two bodies : 1 - static box , 2 - dynamic box. I only want to this dynamic box fall on this static, and lay. But now it looks like that at end , ...
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2 votes
2 answers
349 views

In Box2dFlash my b2body gets detached from my Sprite after I use setXForm()

I have a scenario where I have red coin in a Carrom board game which should be moved outside of the visible window when it is pocketed, also if any coin either white or black is not pocketed in the ...
Vishnu's user avatar
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6 votes
2 answers
2k views

cocos2d Merging box2d bodies

i'm using cocos2d to build an iphone game. my game currently has two sprites: one for the main character and another for an item i should carry once he gets on him. the main character and the item ...
Jorge Cohen's user avatar
6 votes
3 answers
5k views

Polygon/Shape definition changes in Box2D 2.1

I was going through a pretty good tutorial on Box2D here, but I ran into a problem when he made a b2PolygonDef, because the tutorials were made in 2.0, and I'm ...
Ullallulloo's user avatar
76 votes
5 answers
44k views

Good 2D Platformer Physics [closed]

I have a basic character controller set up for a 2D platformer with Box2D, and I'm starting to tweak it to try to make it feel good. Physics engines have a lot of knobs to tweak, and it's not clear to ...
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8 votes
3 answers
2k views

How do the Box2d and Bullet physics simulations work internally? [closed]

I've seen box2d and bullet ported into JavaScript, but neither of them attracted me, except for the source code. It all seemed quite simple, once I looked inside. What are they doing within each of ...
Cheery's user avatar
  • 262
11 votes
2 answers
11k views

Using The Box2D Polygon "Set()" function?

I'm using the Box2D physics engine. And there's a type of shape for box2D called b2PolygonShape. In this class, you can create polygons. There is also a Set() function that takes an array of points ...
xAustechx's user avatar
  • 215
10 votes
4 answers
10k views

Box2D Check If Point Intersects a Body

Is there a way to check if a point is intersecting a body? For example, lets say there's a body in the world at a position of (100,100). Is there a way to check if a point at (100,100) intersects ...
xAustechx's user avatar
  • 215
12 votes
4 answers
10k views

Box2D Get Bounding Box of a Body

In Box2D, I was curious if it's possible to get a bounding box of a body already created in the world. So basically, the Body is created, it's interacting with the world and such. And I needed that ...
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