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

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Changing Box2D Body from Kinematic to Dynamic after contact

What is the correct way to change a Kinematic body into a dynamic body? context - I have a dynamic body as a projectile which has to be fired at a kinematic body (it is kinematic because i am ...
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1answer
372 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 ...
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78 views

Box2D setGravity() in Andengine?

Im currently using the Andengine GLES20 branch. I know that the new Box2D method setGravity() isn't implemented yet. Has anyone managed yet to get it to work with Andengine or to write a method ...
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38 views

Pole vault with Box2D?

I would like to replicate the behavior of a flexible pole as used for pole vault. Can somebody give me some inspiration how to simulate that with Box2D? Would I cannot multiple objects with flexible ...
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1answer
66 views

Libgdx box2d crashing

im making a game in libgdx which i having a bunch of circle bodies floating around in space and when the player's body crashes into another body, that body deletes and creates two smaller bodies ...
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622 views

Communication between Box2D and libGDX Stage (Scene2D) running in separate threads

I'm making a physics based 2D game using libGDX and Box2D. I want to move the execution of the simulation out of render thread. I use immutable messages and the BlockingQueue to pass the information ...
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18 views

Box2d :What is the best approach to build static Box2d smooth curve line

i want to know what is the best approach to simulate smooth curved line as static body it will be like path for car to drive . something like this : http://www.freeriderhd.com/ how does its box2d ...
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36 views

Why the triangulated body in box@d as a sensor is not treated as one but separate triangle bodies?

I am making simple game - kind of race game, where you see from the "sky" your sprites with circle Box2D bodies attached and they have to move along some path/track. My idea was to detect if they will ...
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1answer
54 views

How to restrict jumping to a single jump?

I'm making a VolleyBall game in HTML5 with PandaJs GameEngine and plugin is used physics and Box2D. The problem is that players can jump, but they can jump over the net with multiple jumps. I have ...
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48 views

Preferred way to integrate box2d with SFML

I'm trying to integrate Box2D with sfml. My current solution is to have overloaded functions creating sfml shapes from box2d fixtureDef shapes. I store created sfml shapes under the name 'visual' in a ...
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1answer
38 views

Box2D Lights - Simulate water

I have a libGDX project, in which I have a Box2D world, which is currently filled with some boxes as a terrain. I also added a DirectionalLight to the scene for simulating the Sun. I almost have the ...
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1answer
946 views

Drawing Shape in DebugView (Farseer)

As the title says, I need to draw a shape/polygon in Farseer using debugview. I have this piece of code which converts a Texture to polygon: //load texture that will represent the tray ...
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113 views

Lighting shadow casting sprites with box2Dlights

I currently have something like this using box2Dlights Ideally, I would like objects casting shadows to be lit, so the object is lit but there is still a shadow cast around it. Right now the object ...
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27 views

Using Box2D for soccer physics

I've learned quite a bit of Box2D and I've succeeded basic stuff concluding ball physics. I want to implement 'opposing forces', as the character kicks the ball with a certain strength, with the leg ...
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1answer
66 views

Set Position of multiple bodies

I have a character composed of five bodies which are tied together by a lot of joints. On of them is the overall chassis, to which all forces and impulses are applied to move the whole Character. All ...
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1answer
212 views

Dynamic Hills like Contre Jour in Cocos2d

I'm interested in maps/environments which are flexible and change at runtime, such as those in Contre Jour. I have looked for a long time to find out how to make this effect, but I couldn't find an ...
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48 views

box2d ChainShape into curved line

i need to draw a curved line , i searched the internet and found nothing , maybe someone with knowlegde on the subject can help me with a link , i used chain shape and did this , and i don't know ...
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3k views

How change the size of sprite in cocos2d?

I want to change the scale of sprite like a paper in 'Paper Toss' game. 'Paper Toss' is the game is available on the App store. I want to make a sprite like a paper and change the scale of sprite ...
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1answer
54 views

Box2D Issues determining the side of collision

I'm trying to determine which side of my object a collision is happening. In all of my searching, I have found 2 different proposed solutions, but each one has a major issue. I'm hoping that someone ...
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70 views

Libgdx Box2D and Screen Viewport Scaling

I am currently having problems getting an easy to manage system of scaling my units for use with box2D. Normally I would create virtual units to go along with me viewport and camera but since I am ...
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3k views

Box 2d Level Editor for AndEngine [closed]

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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21 views

How will i know if the Body is facing a the target angle [duplicate]

I want to know if the body of the car is facing the line on the picture
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1answer
29 views

Dynamic body in Box2D with fixed position

I need to fix the dynamic body position so that it would not rotate and would not move even if there are other forces, collisions and so on. Let me first explain why I need this. I have a dynamic ...
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2answers
41 views

How to handle transparent pixels in a spritesheet

I am trying to correctly handle transparent pixels. I have a spritesheet that gave me the following: The green body is the ground physics body and the gray body around the sprite is the sprite's ...
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22 views

Box2D: Making it Determinsitic?

From articles on the web, I found that floating point math generally has accuracy of at least 6 digits. With this in mind, is it possible to make Box2D which uses floats fully deterministic through ...
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78 views

Implimenting BADLAND like Body Movement in Box2d

I am trying to make a body (character in my game) move and behave in the same way as the character in the BADLAND Game with regards to rotation. The character does not have fixed rotation and behaves ...
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76 views

Move Box2D body towards mouse click

In a top down game using Box2D, I would like the player's Box2D body to rotate towards the mouse click, and then move to a point on mouse click (move, not teleport). I have worked out the rotation ...
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22 views

How to trim a sprite?

I have a spritesheet: var spriteSheet = new createjs.SpriteSheet({ // ... frames: { width:520, height:600, regX: 260, regY:300 } // ... }); I am computing it's physics body as follows: ...
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112 views

LibGDX Box2D TileGame Efficiency

I am trying to implement Box2D into my top down tile game in LibGDX. Each world consists of a set of chunks, and each chunk is 16 tiles wide/long. The maximum/minimum chunks loaded at one time is 9 (a ...
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39 views

libgdx - Box2d debug draw not correct

I have a problem where the bodies in my debug draw does not draw correctly, take a look: As you can see, there is some space between the dynamic body and the ground. I have checked the contact ...
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1answer
273 views

Change the shape of body dynamically

I have a problem where i have a ballon which i need to continuously inflate and defalte in update method, I have tried to used setScaleCenter but it is not giving desired result. Below is a code i am ...
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1answer
214 views

How to render a vertex buffer in DirectX11 C++ (specifically with box2d's b2Draw)

I have all the DirectX11 devices etc setup and working with DirectXTK's SpriteBatch and currently attempting to implement a b2Draw class to draw my box2d physics worlds. I have little idea on how to ...
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40 views

Rotating towards a point in Box2D

I'm using Box2d as my physics engine and I'm trying to solve what would normally be a simple problem but what has become a nightmare for me and preventing me from finishing my app. (6 months work) ...
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40 views

Tiled PolygonObjects rendering wrong in libgdx

this is how I render the polygons in Tiled this is how they get rendered in libgdx. Notice the top part of the triangles is straight instead of being hollow. here is the code I use to convert the ...
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116 views

box2D and libgdx: Attach ParticleEffect to Body

Hello I am a newbie with libgdx, my question is: how could I add a Particleeffect to a Body that is moving? I searched about the matter and I didnt find anything related to it. I have the following ...
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43 views

Relative movement in Box2D (keep object from falling off planet)

I'm creating a game with planets orbiting around a sun, like this: The brown square is the earth, rotating around its center and around the sun. The yellow square is the sun, which doesn't move. Now ...
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113 views

Box2D—how make character tilt

I have got a floating character, which should be a robot like thing, floating over the ground, whereby I am using the »hovercar« effect described here. Zhe Image below outlines the basic setup of the ...
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mouseWorld Coordinates Box2D

I have one simple question in Box2D: if you want to get the world coordinates of mouse, this is the function you gonna use in Java: void update(int x, int y) { if(mousejoint !=0) ...
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2answers
61 views

AndEngine rotate all connected bodies

I have created below hexagon structure in Andengine with box2D physics extension. I want to rotate whole structure with respect to center when other ball collides with the structure using physics. ...
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146 views

Explain the difference between extrapolation and interpolation

http://www.unagames.com/blog/daniele/2010/06/fixed-time-step-implementation-box2d here there are two algorithms of smoothing in case of fixed time step physics simulation. I don't understand the ...
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56 views

Why does this impulse not affect the body?

I'm just getting started with Box2d and I'm trying to apply an impulse to a circle but nothing really happens. First I define ball: BodyDef bodyDef = new BodyDef(); bodyDef.type = ...
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196 views

Libgdx/Box2D PolygonShape has no position… well, what now?

As my prototype works perfectly fine I want to advance to more fun areas of the project and add a more complex player-character body. So for Box2D I figured I'd need multiple fixtures, like one for ...
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42 views

Farseer: Friend/Foe Collision - cannot push foes but friends

we are using Farseer in our project and I try to find a setup to achieve the following quite complicated collision behavior: Friendly Units can push each other aside. However, the push should be a ...
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1answer
26 views

Permeable objects in Box2d

In Box2d, can I make a static object to be permeable by dynamic objects? Can I simulate something like water in a way that it lets rigid bodies to dive into it but at the same time pushes them off ...
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24 views

Set world boundaries in box2d

So far I've seen the only way to set boundaries on box2d world which is to create rectangular shapes and place them at the edges of the screen, is there any other way? Perhaps I can set boundaries ...
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1answer
84 views

Box2D pixel to meter conversion

I have a game that was written in pixels and now I want to change it to meters like(box2D do). How I need to do that. I have wached a lot of tutorials and all they have some SCALING FACTOR but when I ...
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30 views

Using box2d with starling

In my game I have a Main class in which i am initializing starling framework by passing Game class like below myStraling = new Starling(Game , stage); In the game class I have Instances of Welcome ...
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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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1answer
799 views

AndEngine; Box2D - high speed body overlapping, prismatic joints

I'm trying to make good suspension for my car game, but I'm getting nervous of some problems with it. At the beginning, I've tried to make it out of one prismatic joint/revolute joint per one wheel ...
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Seeking Advice: Collision with JBox2d for Top-Down or Isometric Maps

I Hope I can make this as clear as possible! Currently working on an action RPG game, very early stages, more just the basic ideas down and written in. So i'll start on with my setup: Using Java ...