# Tagged Questions

A process of adjusting game objects position after collision.

0answers
29 views

### How to resolve multiple simultaneous ball collisions in a pool game?

I'm trying to simulate a break shot in billiards (1 ball hits a pyramid of 15 balls). The formula for 2D ball collision works correctly in my game. But when it is applied to the break-shot, the result ...
0answers
24 views

### Java - Issue colliding with more than one object

Ok, I am working on a simple 2D sidescroller game and having issues with the player (or any moving entity) colliding with another entity. My current method, (a box on north, south, east, and west to ...
0answers
49 views

### Resolving 2D AABB collision problem

I'm adapting the collision resolution code from learnopengl.com for my own engine and since this my first time doing this, I have a problem with how the player position is being modified by the ...
0answers
25 views

### Finding minimum horizontal offset to disjoin two objects in 3D

This is an extension of sorts of the question asked here: Allowing a player to walk up and down slopes without resistance I am using the Separating Axis Theorem to determine the minimum translation ...
0answers
46 views

### Game Physics: Calculating a collision response using the Separating Axis Theorem?

I am working on a project in which I have implemented the Separating Axis Theorem to detect collisions between objects. My current collision response is an object that contains whether it is ...
0answers
43 views

### Handle floating point precision errors in collision detection and resolution

I am experimenting with a continuous collision detection and response of points on a tile map. This are my results for now: I did this by shooting a ray (red line) from the current position (red ...
3answers
174 views

### Strategies for dealing with crowds at choke-points

I've recently switched my game engine over from steering behaviours to impulse based movement with proper time based collision resolution. This has solved so many problems (no more tunnelling, yay) ...
0answers
116 views

### Collisions between players in multiplayer racing game

I'm creating a simple racing game (spaceships, no gravity) using p2.js, phaser and node.js. What I have done: Client receives world state from server: extrapolate other players based on latest ...
1answer
115 views

### How to handle collision detection

So the way that I am doing the movement for my game is that you can left click a unit (which is just a rectangle object), and then it is selected. While it is selected, you can right click and that ...
1answer
26 views

### Canvas/Paint Mechanic

I am currently working on an idea for a unity game app with a canvas mechanic. I understand I may have to use particles for the brush/paint f/x however I can not think of a way to add collision ...
2answers
2k views

### Storing coordinates of every object in server side in MMOs

In an MMORPG: Is it typical or feasible to store the coordinates of every tree, bush rock.. etc in the server side for collision detection? If so, what would be a feasible way to store such a huge ...
0answers
37 views

### Detecting collision between 2 convex meshes in 3D

For the past couple of weeks I've been trying to implement physics in my engine, and I am currently stuck on the collision detection phase. In short, I can perform a triangle-triangle intersection ...
0answers
34 views

### Doing collisions on both axis with java overlap

I'm making a top down game from scratch and just found out about the java rectangle overlap method that would work great for collisions. However, after the overlap happens, I need to check for which ...
1answer
272 views

### AABB Collision Problems in SFML

I have a problem with AABB collision. I am making a top down rougelike in SFML and my collision algorithm does't quite work properly. HERE IS A GIF OF THE PROBLEM. It mostly works, except for when ...
1answer
66 views

### Collision between free player and tilebased map

so I'm working on some sort of platformer in javascript where the map is tilebased but the player can move freely. Now, i have a problem with collision detection/response. It's kind of obvious what I'...
2answers
336 views

### 2D Platformer AABB collision issues

Before anyone say that this questions already has a answer, I will list all the questions I read and tried: AABB collision resolution issues Trouble with AABB collision response and physics Hard ...
4answers
222 views

### Lunar Lander calculating gravity, acceleration and collision in GameMaker

I've already asked this on the GameMaker forums but had no response so far. I'm making a little Lunar Lander game as my first foray in to GameMaker, I'm wanting to have the ship land and take off ...
0answers
52 views

### Problem with collision detection also affecting collision resolution

Hi I am making a 2d scrolling beat em up, I am working on the collision with obstacles like drums and platforms. So far I have the player jumping and falling from platforms but having problem ...
2answers
155 views

### Can I make this physics simulation any faster?

I've made a little real time physics simulation that solves some bodies. CirclevCircle && CirclevOrientedRect I would like someone to tell me if I'm doing something drastically wrong. I know ...
1answer
61 views

### Collision resolution when moving in two directions

I am making a bomberman clone and I'm having problems regarding moving on both x and y axis (pressing down+left, down+right, up+left). Here is a video to demonstrate the problem. I use Tiled for the ...
0answers
19 views

### Collision Handling between two Sets of Polygons?

So I'm making a minecraft mod that allows you to build crafts out of blocks and move them around. I've been stuck on this issue for months now though, which is that I can't get the crafts to collide ...
1answer
75 views

### Tile-based collision problem with corners

I am currently making a tile based collision system. But I encountered a big problem I can't seem to figure out. Use the image bellow for reference. Gray lines represent the border between tiles. ...
2answers
76 views

### Collision works except for when coming from right side

I am trying to make a bomberman clone. I'm having problems with the collision on the walls that is not on the sides of the map (see image). When I come from the right (going left), the red square (...
0answers
34 views

### Circle velocities stay the same after elastic 2D collision

I am following this paper in trying to create elastic 2D collisions among two circles. The problem is that my end velocities are the same as my start velocities. I've looked over my code and don't see ...
1answer
135 views

### Resolving collisions with float precision errors

I'm facing a problem when I try to resolve the collision between two units using floats as positions of the units in my game. I am detecting the collisions using the SweptAABB algorithm and if there ...
0answers
39 views

### Touch and Collisions not working together in AndEngine when i set a custom Physics Handler

I have a set of custom sprites which implement a custom physics handler. The aim is to allow the user to move them by touch, then upon release they should act like a spring is connecting them to the ...
2answers
103 views

### How to make the character cannot pass through other randomly moving objects when they are collided?

As the title above, how can i make my random wallImg solid enough so that my birdImg cannot pass through it from any sides of the wallImg? Here's the code of Processing's Crappy Bird that i've altered ...
1answer
162 views

### How to prevent accelerating along wall during 2d sliding collision response

I'm writing a simple 2d physics system using a circle colliding with edges. When the user presses a key the circle's velocity is incremented by some amount in the direction they pressed. There is ...
1answer
109 views

### Ball's velocity vector, reflect against a point

I need to calculate the new velocity vector when the ball collides with one of the paddle's corners. Let d be the velocity vector of the ball, r the target velocity vector and n the surface normal ...
0answers
82 views

### Is there an algorithm for collision resolution that factors in velocity?

I'm trying to program collision detection between moving convex polygons. To detect collisions, my program uses the GJK algorithm, and to resolve the collisions, it uses EPA. The problem with EPA is ...
2answers
287 views

### Unity Renderer.bounds issue?

I would like to make rend.bounds.max.y be always equal to 20 on collision no matter what, using the script below. But it seems that I can't set it manually and the script has no effect on my ...
1answer
38 views

### 2d Tile Based Collision Response

Right now I am trying to make a 2d collision response system for a platformer, and the algorithm I have for it works quite well. The only problem is that if the player is standing exactly on a tile, ...
1answer
297 views

### How do I deal with collision resolution causing another collision?

I'm making a simple 2D, top-view simulation of an evacuation, sprites running around, looking for exits, going at it, all that good stuff. I have no control over them when the simulation is running, ...
1answer
148 views

### Finding new position after collision with multiple colliders

What is the most accurate way to find the correct position to where a moving character should be re-positioned as a collision-resolution, after it has collided with multiple colliders? The figure ...
0answers
41 views

### Detecting the two Vector3 that determine the bottom-edge of the side of a box-collider that had collision (with C#)

So, I understand that plenty of questions have been posted on how to detect which side of a Box Collider had collision. However, what I am trying to achieve is a little different. I want to find out, ...
0answers
41 views

### Collision detection for multiplayer game with MatterJS

We are developing JavaScript multiplayer top down game where characters can move freely and collide with each other. We are rather weak at mathematics and physics, luckily we don't need much, just ...
1answer
108 views

### Continuous Collision Detection

So I'm playing around with the separating axis theorem and collision. Obviously the problem of what face it collided with arose. I need the unit normal which is tangent to that face it collided with ...
2answers
79 views

### simple solution for 3d collision detection and response

I'm having great difficulty trying to implement collision detection and response in a 3d game What are some simple solutions someone can use to implement smooth collision and response similar to ...
3answers
144 views

### Collision response and delta-time problems

I'm working on a 2d top-down shooter game. At the time, I am trying to get the movement and collision right, but I have a few problems with this. First of all, I am making my game frame independent ...
3answers
338 views

### Collision Detection/Response Issues in Unity

Sprite A: Box Collider 2D and Rigidbody 2D. Sprite B: Box Collider 2D. Both sprites have a Sprites/Default material with Pixel Snap enabled. The textures being used are set to Truecolor Format and ...
1answer
76 views

### QuadTree Checking Collision With Different Levels of Nodes

I am making a QuadTree for a 2D Platformer. Researched on it and I managed to make a pretty good one where each node stores its 4 SubNode and there's a MAX_OBJECTS for each Node and MAX_LEVELS which ...
0answers
55 views

### XNA 2D Tile Baseed Map Collision Messing Up On Inside Corners

I'm creating a 2D Over the head game and the collision system works fine for straight walls and outside corners although not for inside corners. The walls are done by each solid tile having a ...
2answers
117 views

### 2D Collision Response

I am trying to implement collision response in my libgdx game. I'm using Rectangle objects as my bounbing boxes. This makes collision detection very easy, however I can't quite get the response ...
1answer
174 views

### How does matrix based game physics (collision detection & response) work?

I'm familiar with how to do collision detection and response using shape intersection tests, the separating axis theorem, and by using MPR and GJK with minkowski sums and support vector defined shapes....
1answer
139 views

### Sliding DOOM style collision resolution against arbitrary 2D geometry

I've been working on a HTML5 canvas raycasting engine for the web browser, with the end goal of making a simple FPS game in the style of the early 90s. The engine sits somewhere between Wolfenstein 3D ...
1answer
54 views

### Collision resolution moving Point to AABB with raycasting

This is probably trivial, but I'm having trouble making it work. I have a 3-coordinate world of particles simulated with Verlet Velocity. I only care for collision between their centers and a few ...
1answer
67 views

### Objects phasing through each other in physics engine

I'm writing my own physics engine right now (following this tutorial), but I'm running into some problems. Sometimes on collision, objects will just phase through each other instead of bouncing off of ...
1answer
61 views

### How to go about an intermediate collision resolution system?

I would like to know a better way of collision resolution than I am currently doing. My current collision system stores the current positions and previous positions of each object. When an object ...
2answers
217 views

### 2D multiple circle collision response

I'm trying to implement simple 2D circle collision system. There are circles with different radiuses and velocities (the larger the circle the slower it is). Contrary to all the questions on the Stack,...
2answers
250 views

### How to calculate faces involved in collision (Separating Axis Theorem)

I have a game engine created in javascript (https://jsfiddle.net/4gqsq8wf/) which uses collision detection via the Separating Axis Theorem. Currently, it does not have any means of resolving velocity ...