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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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I was making a 2d top-down game, but when I tested it on two devices (Samsung M31 and Samsung S25) there was a problem with player speed - it was faster on S25 and slower on M31. I tried using some ...
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I'm completely new to Box2D. I'm implementing some tests with Raylib. I managed to implement the collision between static and dynamic rectangles and now I want to insert circles into the simulation, ...
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I have a game object with a Kinematic body and a sprite. The object's "draw" method will always position the sprite to match a position of actual body, so the sprite is completely passive. ...
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I have about 100 circle colliders set to dynamic/continuous. They're all being dropped into a "hopper" at the start of the level. I've noticed that this is: A) Tremendously expensive (as I ...
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There is a thin, long rectangle placed slightly below a circle, and I let them fall simultaneously. When they hit the ground, they land perfectly aligned, one on top of the other. In the real world, ...
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What does the phrase "Kinematic bodies do not react to forces and only collide with dynamic bodies" mean? Related: I'm always confused by game engine physics explanations I found this ...
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I'm coding a simple Arkanoid/Breakout game and have problems with removing the bricks. I'm able to destroy the body but the texture is still there. I'm a beginner so is there a simple way to remove it ...
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I recently learned a little bit of OpenGL through learnopengl.com. I've got through the window, gone through the triangle, then shaders along with interpolation, textures, and now transform. When I ...
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Im trying to connect bodies together to make some sort of a "building" system or more specifically im trying to make multiple "blocks" connect to eachother but Struggling to figure ...
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I'm developing a pool game using SFML and Box2D, and I'm currently facing an issue with creating the cue ball outline when the player aims. I have three rays that are cast: two black ones and one ...
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I'm coding a game with Flutter and the flame_forge2d package (which uses Box2D internally). I want to make a game whose principle is similar to that of the game One More Bounce (a game where you have ...
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I'm currently working on a LibGDX Java Game Project inspired by the Space Invaders game where I have created 2 Scene Classes: LevelScene and ...
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I am creating a simple OpenGL C++ game. I have a main character (green box) and some static objects (red boxes) positioned as stairs. The problem is as green box is descending down the stairs, it ...
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What I want I want a physics engine that can support a few dozen balls and polygon objects interacting with each other in a closed environment. It needs to support objects rotating after collision. It ...
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I have a 2D controllable rocket for which I want to plot the parabolic motion. Additionally, the parabola should be able to change due to the thrust of the rocket accelerating it in either direction. ...
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I'm launching a ballistic projectile similar to this sample. The projectile moves from the launch point to the target point, but it's too slow. When I try to increase the speed without changing the ...
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I'm recreating the SaturnV rocket to-scale in Box2D, which so-far involves 3 very massive rectangular bodies stacked on top of each other (1-2 million kg each). Box2D advises not to use such high mass ...
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After creating a few bodies and a map with collisions, the app performance clearly goes down. However, RAM and CPU don't seem fully stuck, but the game experience is horrible nonetheless. GameScreen ...
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I'm using Box2D 2.4.1 and trying to get a spring effect between two bodies. No matter how I change frequency or damping ratio with the Distance Joint, I see no effect.. Here's my setup ...
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In vanilla Box2D various types of Joints can be used to connect two rigid bodies together. The LiquidFun extension brings the Particle Module, but I was unable to find a way to connect a particle/...
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I've been developing my own game engine for the past few days and it's time to add physics. But before adding it in the editor itself, I opened a separate project and tried box2D with SDL2. I always ...
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For context, this is inside my custom 2D game engine. Inside the editor code, when the 'play scene' button is clicked, the scene creates it's b2World and then ...
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I have a problem with Box2D when 2 dynamic bodies fall onto a static body located below when their restitution is non-zero. They tunnel through each other instead of a rigid elastic bounce. If I treat ...
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I need help to use an updated Box2D library where the current version is > 2.3.0. I am unable to find a compatible library and do not know how to compile one for use with the Java Native Interface (...
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Recently I added p_pBody.body->SetLinearDamping(8.0f); code to my player's instantiate code to prevent my player from sliding after I move right or left. Now the ...
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I would like to use pybox2d's Framework class to visualize the simulation. However, the default screen / windows size is 640 x ...
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I would like to create two objects of different density and (inelastically) weld them perpendicular together, so that the final object forms an L. Afterwards, I want to be able to assign a position ...
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I'm working on a small platform game using box2d. When I create the game's objects I store them inside a vector. One for dynamic bodies and one for static bodies. ...
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I'm working on a simple platform game. I have the player - a dynamic body, which moves by ApplyLinearImpulse. Generally it works very well, but sometimes the player ...
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I working on a game project using C++ with SMFL and Box2d. I'm basically recreating the game "Jump and Hover", a simple platform game. In the game ther is an platform thats "hovering&...
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I have seen multiple contradictory articles on this topic. Have been trying to implement the Should the function call ...
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In my game, which implements the network functionality with Kryonet, I would like to send a class ("MyBox2DComponent") over the network which e.g. contains a field of type Body (Box2D). Of ...
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I am working on a particle simulation using Box2D with Processing. The setup: I generate 4 kinds of particles that exist in equal amounts (for instance 200 in total, 50 each). They are (for now) ...
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I'm developing a client/server multiplayer game. in server side i need prevent players cross map objects like walls also i need prevent player go inside each others, instead want to slide them along ...
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I would like to implement a "rail joint" in Box2D: a joint which lets a body move only along a given curve. I couldn't find anything about defining custom joints. Is it possible at all ...
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I have created a kind of framework for a game that combines box2d and sfml. All game scenes are stored in the Game class. The scenes also contain information about static and dynamic objects: ...
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Many guides used userData. But with the source of Box2d I have, I don't see the SetUserData functions in the code as I see them in the guides. After understanding ...
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I would like to use Box2D to simulate a small world, with entity sizes around 1cm (0.01m), some smaller than that. Box2D's FAQ says twice: Your moving objects should be between 0.1 - 10 meters. You ...
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I have an object pinned against the ground by a revolute joint. A motor on the joint makes the object spin. Sometimes the object becomes stuck pushing against a static body. When it happens the object ...
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I have a physical simulation on the streets of a city. The simulation is 2D but in a few points it could develop on multiple "layers": for instance bridges or underground tunnels. I may have ...
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In the void of space, a spaceship releases a rectangle shaped space-torpedo. In half a second, it starts its rocket engine and goes straight until something get in its way, and then boom! The code ...
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Whats the best way to be rendering the locations of objects in box2D in such a way that there no stuttering on movement beyond 8-directions. I'm looking to have object strictly snap to the pixels but ...
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I tried to set up a test demo to see if Box2D physics are working. It works, but I have one small problem: I cannot seem to get the dynamic b2Body to fall faster. I ...
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I'm writing simple AI genetic learning for a 2d car. To do so I need sensors surrounding my car so I can get distance to closest obstacle in every direction. (Picture 1) Picture 1: I need every of the ...
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I have a system where 2D physics objects are spawned, and I need to know when they spawn outside of a region defined by a box collider set to "is Trigger". Using ...
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I would like to create a top down view scene, with one rectangle (top) is on top of an other (base). There is a joint, where ...
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I'm using Cocos Creator with (built-in) box2d for physics. Recently our game behaves weirdly on our new device Galaxy S20 Ultra 5G - which has screen size = 1440 x 3200 - frequency = 120Hz. After stop ...
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I would like to calculate position of physics body after some time because of predicting shots trajectory in my game. I found some great answer here where Iter Ator provides equation to calculate ...
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In this scene, the object becomes invisible and then comes back In this scene, the object becomes invisible but does not come back Is there any way I can tell if an object will come back when it ...
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