Collision detection is the determination of whether or not two or more entities make contact with each other during gameplay.

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What's the most efficient way to check if there is a collision in a 2d game?

As part of my final project of Algorithms and Data Structures, we have to develop an open world game in C++. I already got developed most of the game, but I haven't coded the collisions with the ...
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What is the formula for the collision of two “stretched spheres”?

In Smash Bros Melee, hitboxes aren't perfect spheres or boxes. They are, instead, a shape that looks like a continuous line of consecutive spheres: I.e., the geometry can represented as: Hitbox :...
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1answer
59 views

How to code a multi level isometric map?

I have already worked with isometric grids in the past, but in my current project I found an issue I am not sure on how to solve. I am trying to produce something similar to what's in the below screen:...
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4answers
88 views

How can I determine which Trigger is hit?

I have a GameObject. It has 3 BoxCollider2Ds: Body Collider - Not a trigger - Determines if body is hit Weapon Collider - Trigger - Determines if weapon is hit Vision Collider - Trigger - Determines ...
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1answer
46 views

Check collision between two rectangles - libGDX

I'm making a game in which the objective is to collect the maximum amount of balls(Rectangle) to get the highest score. The balls spawn randomly from the middle of every side of your smartphone, and ...
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37 views

When to Use Spatial Hashing vs Bounding Volume Hierarchy?

I've been slowly working on implementing a spatial hashing function into Bullet Physics to see how well it will work in my game engine as a general use. Though as I'm starting to design it, I do ...
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2answers
55 views

LibGDX - Collision detection between all bullets and all enemies

I'm trying to make a collision detection system between the player's bullets and all the enemies on screen. So far I had something like this: for (Bullet bullet : hero.getPistols().getAllShotBullets(...
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37 views

How to manage collision of two player ?

I'm developing a multi-player car game. Suppose that car A hit car B: both A and B have Rigidbody and collision functions attached. Because car A hit car B i want to take actions only to car A (add ...
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1answer
33 views

Pygame: Collision detection

i've been adding some extra stuff like Gravity and a table to a simple pong game made with Pygame and Python, the problem is that i dont know how to add collision detection, so when the ball hits the ...
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0answers
24 views

How can object push each other / bounce with swept AABB / continuous detection?

I'm making a small 2d rigidbody physics engine. All objects are AABB (the engine doesn't handle rotation). Currently, the detection system work with a swept AABB test and can determine the time of ...
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1answer
22 views

Disabling object OnCollisionEnter and Enabling it On Collision exit

I have two objects that when they collide disable another gameobject. The problem is that I only want to have the other game object disabled while the two objects are touching and that I want to have ...
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35 views

Detecting collision of multiple moving objects

I have wrote a simple game that has a 100 balls bouncing off the borders of the canvas. Each ball is an instance of ball class function that has the following definition: var cnv = document....
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1answer
71 views

Should I check all the collisions in the game world?? - 2D game

I'm developing a 2D game engine and right now I'm designing the collision system. I've read about space partitioning and QuadTree, and I understand that only the objects that are in the user's view ...
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48 views

Online Enemy Hit Registration methods

Basically I have been working on an online game for quite awhile now, and I have started rewriting the original networking framework. Before it was pretty much fully Dead Reckon based(Enemies just ...
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1answer
17 views

Changing speed of an object

Is there a way of changing speed of an object at certain time? I want to change my speed to my initial speed after colliding with any object. I have already added bounce Physics to my colliding ...
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1answer
18 views

Maintain speed, in 3D game, after collision in Unity

I am making a simple breakout game. I have added bounce physics to the ball and to the bricks. When the ball collides with the bricks, the speed of ball slows down. I want ball to maintain its speed ...
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1answer
79 views

How to achieve 2D ski movements similar to Alto Adventure?

I'm trying to achieve 2d movement similar to Alto's Adventure with Unity 2D. When grounded I want the character to slide alone the terrain parallel to the slope, but I want to be able to freely rotate ...
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1answer
114 views

Slow collision detection at low frame rates

I'm experiencing an odd issue with my collision detection. I'm using the Update method to move the player (I don't want to use FixedUpdate because that creates an undesired weird movement). The fixed ...
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0answers
51 views

Collision detection not working for JavaScript Game

I'm working on a JavaScript game called Spacecraft which is minecraft 2d style. The problem is that my collision detection is not working. It works for a all the divs but the ones with the class of ...
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2d platformer distance-based collision bug

I'm writing a 2d platformer collision algorithm, and I have everything almost working, except for one last remaining bug. I do collision by measuring the distance between the player's center and the ...
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2answers
49 views

When to calculate AABB collisions

I was wondering if collisions are usually calculated the exact moment an object is moved or if it is calculated in the game loop. I haven't been able to find anything on this. Thanks
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1answer
58 views

How does zooming in affect collision detection?

So i'm pretty new to DirectX, currently going through some tutorials to get an understanding of it. Now that i'm getting a small grasp on graphics programming, im just wondering how simple AABB ...
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25 views

What are the best bullet collision detection methods for FPS games? [duplicate]

Bullets are too fast and can be represented as points. Common collision detection methods, like the ones using bounding volumes, may not be suitable. What would be the best for this work. Edit: this ...
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1answer
97 views

How to program destructibles?

I'm thinking about programming a 2d simulation of a spaceship that takes damage depending on where the projectile came from (e.g. from behind - engine, from the front - lasers, sides - hull, etc.). ...
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Game Maker - Collision With Subimage Total Storing

I have three objects: obj_bullet, obj_meteoriteLv2, and obj_tempMeteoriteLv2. obj_meteoriteLv2 contains 4 sub-images. obj_tempMeteoriteLv2 makes obj_meteoriteLv2 spawn. obj_bullet is controlled by ...
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1answer
75 views

How to combat exponential growth in sprite messaging?

In my 2D platformer game, I have a number of sprites moving around the world. When two sprites collide with each other, I calculate how deep the collision is and then call a virtual method on both ...
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1answer
63 views

How to handle interaction with the map in a 2D-RPG-typed TileMap?

Sorry if this is a long post, but I'd like to explain the context before asking my question ^^" I'm currently working on my "first" game (the more advance one, at least). It'll be a 2D-ARPG where the ...
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23 views

Mesh Collider in Monogame

I try to implement a few complex objects and want to achieve that they collide based on everything the player is able to see. Therefore I am not able to use the basic BoundingSpheres. Has anybody an ...
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1answer
50 views

Detect Collision on Child Object

I've created an obstacle prefab. The Prefab has following hierarchy. The player must die if he collides with Enemy. But It detects collision with parent object. I am also uploading the screen shot ...
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0answers
44 views

How to integrate Tiled maps and collision detection with pygame?

I have been using pygame to make a simple rpg pokemon style game. To create maps I have used the Tiled map editor and then loading them into pygame using pytmx. I have heard that you can add object ...
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1answer
83 views

Targeting logic for 100.000 units army

I am making an army fight for my website armyfight. There can be fights of hundreds of thousands units. I am looking for better unit targeting. in jsfiddle is an example. var enemy = { 2: { ...
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1answer
37 views

onTriggerEnter(Collider obj) is not invoked on collision with a trigger or a rigidbody

void onTriggerEnter(Collider other){ if (other.gameObject.CompareTag("Pick Up")) { other.gameObject.SetActive(false); count = count + 1; setCountText (); } This is ...
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1answer
69 views

Game Maker Studio - Check Collision With Subimages

I have an obj_roulette, which contains 4 subimages, with value 2-5 and image_number 0-3. The value result from roulette stored as var global.roulette. Then, I make many obj_meteorite, which contains ...
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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 ...
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1answer
51 views

Bouncing from any object after collision JavaScript

I'm trying to make a ball bounce off some obstacles after a bounding box + pixel by pixel collision. Somehow, sometimes the ball is not going in the direction it is supposed to be. If the ball is ...
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0answers
38 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 ...
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0answers
74 views

Pixel by pixel collision detection pinball

I'm currently working on a Pinball game using the HTML5 Canvas and JavaScript. Right now I'm getting a hard time with the pixel by pixel collision, which is fundamental because of the flippers. Right ...
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1answer
35 views

Question regarding simplification of world creation and collision (VISUAL BASIC)

In my computer programming class we are creating our own top down adventure games in Visual Basic. Currently I have been able to have the player appear on screen and collide with a block on the screen....
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0answers
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SAT: which normal to choose when two sides are parallel

I am trying to make collision detection work for any convex polygon using SAT. My code works and returns the proper axis with minimal overlap which is later used to separate the two entities. There's ...
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2answers
28 views

Moving towards and switching targets in Unity with collision

I have these nodes set up for a ship to move towards over time with out looking stops then repeats in a sequence. like so: 1 2 3 1 2 3 1 2... THE PROBLEMS i keep having either come from the ...
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1answer
45 views

2D moving sprites collision

I'm trying to create a game where i have two abjects A and B 1 :I know the shape of the two objects(Rectangles) . 2 :The speed and position of each object. And i'm trying to figure out if the two ...
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0answers
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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 ...
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1answer
31 views

libgdx collision on moving Rectangle with other Rectangle

I'm making a soccer game where you touch the screen and the player shoot the ball to the touched position with the objective of scoring goals when it hits the goal. The player is just a Sprite and the ...
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1answer
27 views

Finer collision detection with multi-path Polygon2DCollider from Tiled2Unity

I'm in the process of incorporating Tiled2Unity prefabs into my code. Their exporter creates a collision object (shown below) that amalgamates the collider of each tile into a single Polygon Collider ...
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0answers
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Collision event callback on p2js not working

So, I'm making a simple game on Phaser where a ball object and bullet group collide with each other, incrementing a score variable whenever this happens. I already set up the collision groups and are ...
0
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1answer
27 views

XNA/MonoGame Collisions between two boxes don't work as expected

I have the following problem: I have two GameObjects (one is static, the other is the player). Both of them have one BoundingBox that surrounds them, and a List that contains more BoundingBoxes for a ...
2
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1answer
131 views

Could triangles be used for swept-AABB checks between positions?

I'm trying to understand swept-AABB collision detection. When checking for collisions between two positions of an object, I commonly see one of 3 strategies used: Rays: trace rays from parts of the ...
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4answers
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Is it a bad idea to “map” the mouse position on the screen so that collision detection works regardless of resolution?

Consider a game who's default resolution is 800x600. Objects with collision masks are placed in a game world of size 800x600. The collision masks can detect when the mouse collides with them. Now ...
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4answers
120 views

How do I trigger just once and not multiple times if I the Player enters the Trigger? [duplicate]

I wanna trigger just one time and not multiple times. I have a Health System and I want that the Player takes damage from an GameObject if he enters the Trigger but it directly triggers like 65 times ...