Box2D is an open-source rigid-body 2D physics simulation library for games, written in C++.
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Making Puzzle Bubble type game in AndEngine
I want to make Puzzle Bubble clone game and I need some serious help.
Can you please tell me using physics what should I start with? I mean how can I make addictive levels and How can I reflect the ...
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0answers
38 views
360 degree gravity game mechanic like “They Need To Be Fed” game
I am a fan of "They Need To Be Fed" game and I want to understand the game mechanic at a deeper level. What are some good resources for the basic Box2d (or similar) physics behind the 360 degree ...
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1answer
55 views
Hill-jumping game mechanic like Tiny Wings
I'm a huge Tiny Wings fan and I'd like to understand the game mechanic at a deeper level. What are some good resources for the basic Box2d (or similar) physics behind the hill-jumping game mechanic?
...
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0answers
23 views
Applying the vector of a swipe movement to a box2d object
Hi I'm trying to achieve game functionality where the player can place their finger on an object then swipe in a certain direction and apply the speed and velocity of the swipe to the object they have ...
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0answers
33 views
How to make askew slope image(b2body) in Box2d?
I am new in Box2d and learning myself. I am learning Box2d from here http://www.box2d.org/manual.html#_Toc258082972
I want to make a body and want to give b2body a angle so that it will look like ...
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2answers
80 views
Client-side physics simulation
I am trying to create a very simple client-server based physics game, using box2d library. A simple football game.
Obviously, the server runs only the box2d world.
My question is:
is it correct to ...
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1answer
97 views
Separation algorithm in flock simulation?
I'm using box2d (the c++ one).
I found a method for an arriving behavior (on http://www.red3d.com/cwr/steer/gdc99/ ), which works well, problem is, the bodies are bumping into each other and it ...
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0answers
18 views
FlipX Sprite By Checking Position
I have bird flying. My bird is flying but i want it to fly right and left using flipX.
I want when my bird fly right it should flipx=No and when it goes left my should flipX=Yes.
simple like duck ...
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19 views
Weld Joint Box2d not run
i have two object like this :
b2WeldJointDef weldJoint;
//frist body
bodyDefXich.type = b2_dynamicBody;
bodyDefXich.position.Set(3, 2);
b2FixtureDef fixtureDef;
b2PolygonShape ...
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0answers
36 views
Catching an object from sky in Cocos2d and Box2d world
My world has a gravity of -9.8 and there are KDynamicBodyType bodies falling from the sky. At the bottom there is a PhysicsSprite with KinematicBodyType. I want the PhysicsSprite to be able to catch ...
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1answer
120 views
Is there a “box2d without physics” lib (only for collision detection)?
Box2d Collision detection algorithms are probably the best ones out there. Unfortunately, they are bundled together with a realistic physics engine that I don't need.
Is there an open source project ...
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1answer
66 views
Bodies do not stay sticked together by joint in retina display
I'm rehearsing on Box2D revolute joints. Everything's going pretty well except for one thing. For some reason bodies joined together with revolute joints do not stay sticked, they start getting apart ...
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1answer
52 views
How do I copy box2d data from one body to another?
I want to copy all Box2D-related data (position, velocity, rotation, impulse, ...) from one body to another.
This is what I've got working (with box2djsweb):
var t = body.GetTransform();
...
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1answer
109 views
Why might a body suddenly stop while moving on continue platform?
I have a 32x32 sprite and I make some to be platform like this
for (int i = 0; i < 15; i++) {
attachChild(new Ground(32 * i, 200, regPlatform, vertexBufferObjectManager, physicsWorld));
}
...
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1answer
134 views
Is using Box2D for simulating gravity “in space” a good idea? [duplicate]
I'm attempting to write a simulation of a solar system of planets in 2D space that are attracted to each other through Newton's law of universal gravitation.
I know that it is possible to simulate ...
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0answers
47 views
Cocos2d/Box2d Component based entity system
Recently I've read somewhere that it is not a good idea to inherit from CCSprite class when making your game objects. In my CBES each Game Object has :
-PhysicsComponent(responsible for updating ...
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101 views
Slow Rope Joint Simulation
I am right now developing game similar to Cut The Rope.
But I have some problem in developing this game.
I have successfully created rope and attached multiple rope with candy.
Below I represent ...
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77 views
Box2D, OpenGL, resolution and matrix setup
Okay, my internal units are going to be meters, ranging between 0.1 and 10 meters for size.
First of all, my mind is all wrapped up in a knot trying to understand how to handle my game with multiple ...
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0answers
72 views
Help with ball movement and rotation in Box2d [closed]
I am trying to learn box2d in cocos2d. I have searched for online tutorials and ray Wenderlich's seem to be the best ones!I am learning in a slow but steady pace! I am currently developing an app in ...
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1answer
59 views
Box2D OpenGL debug renderer convert box2d coordinates to world space
I made an OpenGL 3.x renderer for Box2D's debug draw (b2Draw base class). Unfortunately I've tried for a while now to convert the box2D units, which are meters to my internal units which are pixels. I ...
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0answers
50 views
Large Polygon Body in Physics World than Actual Debug Draw Show [closed]
In my game, I was creating hammer object using following code.
public Body createBody(Vector2 position, String bodyName, String path,
float angle, PhysicsWorld ...
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0answers
53 views
Box2d and opengl units [closed]
I'm trying to use Box2D with my WebGL renderer and I've got a strange behavior :
My dynamic bloc is floating aside walls, it's look like the physic world is bring forward the graphic world.
I know ...
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1answer
138 views
Making the player walk on walls in box2d
I'm making a game in stencil where players walk form left to right along randomly generated walls. I cant use waypoints, since the walls' shapes and positions are unpredictable.
Here's a descriptive ...
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1answer
124 views
Is it bad practice to set the velocity of an object every loop?
Say I have a simple game with a gameLoop function that gets called every 50 milliseconds or something similar, and I have a box2d object. Is it bad practice/too CPU intensive to use SetLinearVelocity ...
2
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1answer
174 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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1answer
108 views
Libgdx import bin/xml/json from physics editor
I'm using Libgdx. I did a simple json file in Physics Body Editor and I don't have any idea how could I import it into my physic world in libgdx.
Any idea will be appreciated.
P.S: Sorry if there ...
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3answers
180 views
Libgdx body passing through block then fall on it
I'm using libgdx and its physic engine Box2d. My question is : how could I make my box2d body go through a block , ignore the first collison than make the block active so the ball can fall onto it. A ...
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1answer
324 views
Mario like jumping and landing in box2d, help
I've been trying to get Mario type jumping/landing in a Box2d game and it's been giving me some trouble.
Results: Player loses velocity on landing
Desired Results: When player lands it will continue ...
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1answer
158 views
Rotate Box Sprite With Circle Body
I want to rotate my rectangular sprite with circle body.
The problem is the body doest not attached to the centre of the sprite. This was the default behaviour of the body and sprite.
But I want that ...
1
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0answers
93 views
Why won't my Box2d bodies collide? [closed]
I'm doing something wrong when trying to get bodies to collide using jBox2d & Slick2d. Here is have just my basic init, update, and render methods. Render and update seem to work fine for drawing ...
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2answers
110 views
Increasing speed of circle over time as linear with Box2d
Assume that there is a circle and it can be moved by using keyboard arrows.Is required that increasing speed over time like increasing car speed. For example; max speed is 25 and time to reach max ...
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45 views
GetReactionForce().y does not show 0 even it has no weight
I have built a simple structure with static and dynamic bodies and revolute joints. None of the bodies have weight, I've set the density to 0. Here's the structure:
In screen update method I do ...
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1answer
261 views
How would I make an air hockey AI?
I am making an air hockey game for Android using AndEngine and its Box2D extension.
How would I make an AI for an air hockey game? For it to work the AI would not only need to move its paddle side ...
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4answers
373 views
Making a Box2D ball bounce to constant height
I want to create a game like Doodle Jump. I'm using libgdx and Box2d. I needadvice on how to make my ball bounce constantly and with the same height.
I've tried setting the ball's body restitution ...
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0answers
118 views
How do I get the compression on specific dynamic body
Sorry, I could not find any tag that would suit my question.
Let me first show you the image and then write what I want to do:
I'm using box2D. As you can see there are three dynamic bodies ...
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2answers
118 views
How to translate from Slick2d coordinates to jBox2d
I read through this question to try and get a grasp on the topic, but I can't figure out how to apply this to my Slick2d window.
I'm trying to do something as simple as place an edge on the bottom of ...
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1answer
133 views
Debug Render In Cocos2d Android
I want to implement debug render for cocos2d android.So I can view how bodies are created.
Right now I use gdx.jar file for box2d and load that jar file following way.
static {
...
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1answer
119 views
Bicycle creation in side scrolling game [closed]
I am developing side scrolling race game.
For that I create bicycle but it can't work perfect as my assumption. Following are code for it.
public class Cycle {
private float accelerate = 0f, ...
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2answers
73 views
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
329 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
135 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
147 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
161 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
291 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
138 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 ...
3
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1answer
106 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 ...
2
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1answer
55 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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50 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
98 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
71 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 ...
