Box2D is an open-source rigid-body 2D physics simulation library for games, written in C++.
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Problem with sensor in box2d [closed]
I have two bodies: one green static sensor (spikes) and one orange dynamic body (brick).
I have bullet and it's a dynamic body too, but with bullet flag set.
My problem is that when the bullet is ...
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1answer
407 views
JBox2D simple example for Android? [closed]
I'm starting to develop an Android game. I've already installed jBox2D but I can't find complete code to develop a simple application from scratch using this framework.
Thanks in advance!
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2answers
142 views
What to use as a Box2D renderer in a release version?
I'm creating a game with libgdx. For testing physics I use a Box2DDebugRenderer, which is not fast. When I want to release my full game, what should I use as a renderer?
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1answer
176 views
Understanding Box2d Restitution & Bouncing
I'm currently trying to implement basketball bouncing into my game using Box2d (jBox2d technically), but I'm a bit confused about restitution.
While trying to create the ball in the testbed first, ...
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1answer
189 views
Ligdx Box2d : convert box2d coordinates into screen coordinates
I'm new in libgdx and i have a little problem. I created a body in box2d and i want to assign it a sprite; for that i need to get the position of the body,then insert into the main loop the updated ...
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2answers
378 views
What is the Box2D coordinates system?
I know that for Box2d I need to translate pixels to meters which is easy peasy. However my problem is what is the orientation of Box2D coordinates system? Is this the same as screen one (right += x, ...
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3answers
146 views
Box2D - Do these simple objects need to be in the simulation?
I would like to get input from the community regarding how best to represent simple objects in a Box2D based simulation.
Some background:
Without going into too much detail, think of a top down game ...
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1answer
114 views
Collision Filtering in Box2D
I have four bodies in my Box2D World. Each are polygon shape, with some physics parameters.
Now when the game start, I need one of the bodies from the World (BodyA) to not be allowed to collide with ...
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1answer
56 views
Accessing other classes from a Box2D (farseer) body
I'm using Farseer for physics in a game, and have several key classes: Planet and PlanetProp. Each planet has a large circular body and a "field". This field is a large sensor around the body. ...
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0answers
51 views
Problem with the multiple polygon collision
I have created the heart body used the physics editor and it gave me the 3 polygons.I have multiple heart bodies that are spawing. When it collide with car body my application hang after some ...
2
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1answer
101 views
Efficiently storing game states history for physics?
I would like to store the history of a box2d simulation. Currently I can't find any built-in mechanism for that.
I need to store the states of all non static objects in the last second, mainly for ...
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1answer
76 views
Making a physics body so that another body passes through
Basically I "think" I want a static body that does not have any density so another body can "pass through it" without getting slowed down. I tried this and it doesn't seem to work. What would be the ...
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31 views
Check duplicates in the removeList in box2d iphone
sometimes a collision is called twice in that case i need to be check duplicates from the removeList. because of this my application is getting crash or hang.
How can i check duplicates in the ...
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1answer
144 views
Parallax With Box2d iphone
I am creating the simple game. In that game car will move and obstacles will come in the car way we will have to save that car from that obstacles.
What I have done. I have created the car with the ...
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1answer
369 views
Create Box2D and engine polygon Box2D body without sprite
Hey I have created my body using following code: (please read full description)
Body polyBody;
final BodyDef mBodyDef = new BodyDef();
mBodyDef.type = BodyDef.BodyType.DynamicBody;
...
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1answer
545 views
Getting Bodies to go “Super Fast” in Box2D
I am making a breakout game in Android using the LibGDX version of Box2D. I have a ball that I am applying a force to with the following code...
getBody().applyForceToCenter(-10000000000.0f, ...
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1answer
219 views
box2d with lines
I have a very simple platform game builder and I've specified the ceilings, walls and floor as line segments.
A line has a winding, or normal; you can determine the direction that a line should be ...
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1answer
477 views
How to create Elastic rope / Rubber band in box2d?
I am trying to create the rubber band type or elastic rope.
i ant to do something like bellow link.
http://heyalda.com/smash-turtle/
Thanks,
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2answers
324 views
Non-physics character movement in a Box2d Environment
I am in the process of creating a physics platformer. However, I want the player movement to feel very old-school(as in: non-physics like), which means that the character:
Should always move equally ...
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1answer
54 views
Best way to have a body with 1 dimensional linear only movement in Box2D
I have a body that I am using as a paddle, it is expected to move in a vertical fashion and other objects should "bounce off it". The paddle itself should never move horizontally.
According to the ...
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1answer
81 views
How to create strength meter?
I am creating game like bow and arrow. I want my hero will shoot the arrow with the strength meter, how will create the power?
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2answers
333 views
Moving player in Box2d without forces
How do I move player with keyboard without applying forces? If I do playerBody.setLinearVelocity(new B2Vec2(0, 2)) it moves the player but when I release the key for movement, the ball is continuously ...
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1answer
505 views
Stopping on a slope in Box2d
I am creating a simple platformer using Box2d. I've implemented a variant of the technique described here.
To make the player character move more 'platformer-like' I want him to stop on (shallow) ...
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1answer
126 views
How to handle sprite speed when objects move using Box2d?
I have a basic platformer using Box2d that works great. However, I now want to stop using my default square, and implement some running and jumping animations.
How can I ensure that:
When running, ...
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3answers
1k views
Box 2d Level Editor for AndEngine
I am getting started with Box2d in AndEngine.
I need to know if there is any level editor to be used with box2d and gives output capatable with AndEngine.
Is there any tool which can help me building ...
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1answer
216 views
How to make a character in a Box2D world jump faster?
I have a question about using Box2D to simulate a physics-platformer.
I manage to make the character move to the right and left, and jumping as well. However, jumping seems extremely slow when ...
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0answers
177 views
LibGDX Touch Box2D Body
I am using LibGDX, however, instead of using the stage, actors, etc, I wanted to use straight Box2D that way I could port it easily (to iPhone) later. I have the character moving with the ...
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1answer
95 views
Best way to allow a user to Control Body in Box2D
I am working on a simple game and I am deciding how I should let users interact with the world. I really have 2 options,
1.) When the user moves an object I apply a force to the body
2.) With each ...
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2answers
308 views
How do I get the touch event on a body in Box2d(Java)
I have various bodies rotated at some angle with the help of Box2d in libGDX. What I want is to destroy the body when I click on it, but the problem is that I am not able to get the area definition of ...
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2answers
385 views
Applying Forces to Box2D Bodies
In full disclosure, I am VERY new to box2D let alone the Java version of it.
I have a box (here of type Hero) that I am trying to move. I did this by trying to apply a force as follows...
private ...
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3answers
138 views
What could cause a sudden stop in Box2D?
I'm using Box2d for a game, and I have a bug that's driving me nuts. I've simplified the situation down to a square player sliding back and forth frictionlessly on top of a floor composed of a series ...
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0answers
126 views
Letting the user draw a Polygon Body and Image
In my game, I want to provide the user with a drawing feature.
By free hand drawing, the user creates a polygon shape. Then, in my game implementation, I have to create a body for the found vertices ...
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0answers
210 views
Error in destroying object in Box2D/LibGDX
I'm trying to delete an object when a collision happens. I have put the following code in the render method of the object so it would be outside of the physics calculations.
public void ...
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0answers
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box2D simulation doesn't work [closed]
has been a while since last time i used box2D, and i needed to make some stuff, and i saw that my simulation don't worked (compiles, but do anything). i haven't been able to even have working the ...
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1answer
76 views
Questions for QueryAABB
I'm currently having trouble getting my head around QueryAABB, and hope to find some answers here.
The LowerBound of an AABB the upper-left corner (and vice versa). Why is that and what idea is ...
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1answer
92 views
How to detect whether an Object came to sleep at a specific position?
I'm currently writing a small game with box2dweb and I need some direction for this: I'm throwing a Box and have to hit a specific place and trigger an event when the object that's been thrown isn't ...
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1answer
87 views
How to get the Exact Collision Point and ignore the collision (from 2 “ghost bodies”)
I have a very basic problem with Box2D.
For a arenatype game where you can throw scriptable "missiles" at other players I decided to use Box2D for the collision detection between the players and the ...
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2answers
153 views
Single and Double Jump with single button.
I want to make Single Jump on Single Tap and Double Jump on Double Tap. My problem is that if I make double Tap on ground then it’s fine but if I make first Tap on ground and second Tap in Air then ...
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0answers
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Flick Kick like game with box2d and flash as3
What would be the best approach for creating a game like flick kick with box2d and AS3?.
To make my self more clear, what i would like to do is to use the physics of box2d in the z-axis, i know that ...
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1answer
96 views
Basic Use of ApplyImpulse
I am trying to apply a force to a bunch of b2_dynamicBodys, but it seems to only work for a random number of items and then stops with an error.
//create some items to move
bodyDef.type = ...
2
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0answers
233 views
AndEngine Box2d game
I'm developing a 2d survival shooter using Box2d extension and I've got some questions:
I have two AnalogOnScreenControls. Their listeners modify both
sprites and bodies. I receive TouchEventPool ...
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1answer
333 views
Attach my sprite with Box2d [closed]
I'm coding Javascript(HTML5) with Box2D. And I want to ask how to attach Sprite with Box2D.
This is function My sprite:
function My_Sprite() {
this.m_Image = new Image();
this.m_Position = ...
2
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1answer
511 views
Specifying force and angle in ApplyImpulse in box2d
I need to apply an impulse on a object with a particular force and at a particular angle in Box2d. If I am right the syntax would be the following:
body.GetBody().ApplyImpulse(new ...
2
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1answer
259 views
What's the best way to handle slopes for a platfomer game using Box2D
I would like to know if there is any known solution for handling the player's movement on slopes using Box2D engine.
I tried to do it using a circle as the player. Everything was fine until I tried ...
2
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1answer
416 views
Directional Lights
I'm working on a game idea (2D) that needs directional lights. Basically I want to add light sources that can be moved and the light rays interact with the other bodies on the scene.
What I'm doing ...
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2answers
956 views
How to create an extensible rope in Box2D?
Let's say I'm trying to create a ninja lowering himself down a rope, or pulling himself back up, all whilst he might be swinging from side to side or hit by objects. Basically like ...
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1answer
195 views
Box2dWeb positioning relative to HTML5 Canvas
I'm new with HTML5 canvas and Box2DWeb and I'm trying to make an Asteroids game. So far I think I'm doing okay, but one thing I'm struggling to comprehend is how positioning works in relation to the ...
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1answer
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Counting no.of bodies present in certain area in box2d?
I am stuck on it:how can i count or find the no.of bodies present in any area in as3?would be thankful if any guys help me out.....
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0answers
195 views
Wheel Joint Implementation in AndEngine
I am currently developing car game in AndEngine. In which I was using revolute joint for car wheel and chassis attachment. But my friend suggest me that use wheel joint for that purpose for better ...
2
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1answer
280 views
How do I make a rope from point A to B in Box2D?
I need to make a rope (preferably not elastic) from one point to the next in Box2D. If it helps, I'm trying to develop one of those 2D Spiderman games, like this: ...
