Box2D is an open-source rigid-body 2D physics simulation library for games, written in C++.
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1answer
44 views
Language & framework for fast prototyping Box2d problems [closed]
I am often in need of a fast prototype box2d scene where I can play with parameters. I work with AndEngine on Android which doesn't suit me for prototyping. It's good for the final game, but ...
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votes
1answer
41 views
How do I change gravity of box2d world after world is created?
I want to modify the world of box2d after creating it, namely to change the gravity vector. Is there a way to do this?
2
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2answers
41 views
AndEngine: edit elasticity on action
I'm making a game for Android with AndEngine.
It's going quite well, but now I'm stuck on something.
My main character has a elasticity set in its fixturedef so it bounces around throughout the ...
0
votes
0answers
23 views
Problem Implementing Texture on Libgdx Mesh of Randomized Terrain
I'm having problems understanding how to apply a texture to a non-rectangular object. The following code creates textures such as this:
from the debug renderer I think I've got the physical shape ...
5
votes
1answer
159 views
Generating a physics body for 2D Worms-like Terrain
I wrote a processing sketch that generates hills for a scorched earth clone, like this:
I'm trying to figure out how to make this a physics object in libgdx, but I'm having problems figuring out ...
0
votes
1answer
26 views
Moving a Box2D object in the direction it is facing using applyForce [duplicate]
I'm trying to apply force to a polygon physics object to move it. Whilst I can get it to move upwards easily enough, I'm trying to get it to move in the direction in which it is pointing.
Here's my ...
0
votes
0answers
33 views
Box2D physics object rotating for no reason? [closed]
I have a physics object in LibGdx (Using Box2D). I'm applying an impulse of (new Vector2(0, 18f * MetersToPixels) (MetersToPixels is = 15f). The gravity in the world is equal to (0, -9.8f).
My ...
1
vote
1answer
32 views
Ring and Pole - Box2d
How I can make a b2Body in box2d so that it could form a ring which does not collide from the center just like a ring. like when we flick the object and there's another body (like pole), the pole can ...
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0answers
29 views
Unable to reset level in Box2d using javascript for html5 game [closed]
I am using Box2dweb for my box2d ball game. I am unable to reset the game. The world is destroyed completed after the ball is thrown once. could any one figure me out where i went wrong?
var b2Vec2 = ...
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votes
0answers
32 views
Libgdx ball game [closed]
I'm really new to Libgdx engine. I've been trying to make a ball move randomly and bounce of the edges. It took me two days and I couldn't do it. I only have the ball bouncing up and down. There is a ...
4
votes
1answer
140 views
How to simulate feather fall in box2d?
I am working with AndEngine with Box2d extension, but general answer or a concept idea will be appreciated too.
I have feather-like objects in a 2D side view world that I want to be part of the ...
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votes
0answers
20 views
How to run animation with joystick position? [closed]
[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"walkcycle.plist"] ;
spriteSheet = [CCSpriteBatchNode batchNodeWithFile:@"walkcycle.png"];
[heroWorldLayer ...
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votes
0answers
70 views
How to run two animation at same time at same sprite?
In my game i am running two animation by ccspawn but it shows only one animation at a time. what i do? here is my code.....
[[CCSpriteFrameCache sharedSpriteFrameCache] ...
3
votes
0answers
53 views
2.5d with box2d - approaches from the top and bottom
So, I'm using box2d for my 2.5d game (think double dragon, tmnt arcade, castle crashers) where you can move around on the z-axis (faked as y-axis movement). Basically, I have box2d only doing ...
0
votes
0answers
10 views
Changing Volume and mass of of B2Polygon object does not changes it's volume .why?
'body' contains body which is sent from world.querypoint.On it i am resizing it and increasing it's mass but it's density remains the same. fbs.GetDensity shows output as 1 . :(
var ...
0
votes
0answers
74 views
Making Puzzle Bubble type game in AndEngine [closed]
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 ...
0
votes
0answers
53 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 ...
1
vote
1answer
74 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?
...
2
votes
2answers
85 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 ...
2
votes
1answer
106 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 ...
0
votes
0answers
33 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 ...
0
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0answers
43 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 ...
0
votes
1answer
147 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 ...
1
vote
1answer
77 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 ...
3
votes
1answer
65 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();
...
0
votes
1answer
125 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));
}
...
1
vote
1answer
182 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 ...
0
votes
0answers
54 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 ...
0
votes
0answers
110 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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vote
0answers
80 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
83 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 ...
0
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1answer
71 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
63 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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votes
0answers
60 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 ...
0
votes
1answer
149 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 ...
2
votes
1answer
126 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
votes
1answer
190 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 ...
0
votes
1answer
135 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 ...
3
votes
3answers
189 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 ...
4
votes
1answer
346 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 ...
0
votes
1answer
176 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
vote
0answers
104 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 ...
0
votes
2answers
126 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 ...
0
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0answers
47 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 ...
2
votes
1answer
285 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 ...
5
votes
4answers
411 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 ...
7
votes
1answer
130 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 ...
0
votes
2answers
129 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 ...
1
vote
1answer
138 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 {
...
0
votes
2answers
79 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 ...
