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

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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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2answers
426 views

Unity PHOTON/PUN Collision Detection

I am trying to create a virtual 3D chat room based on character interaction (just like in Sims2), so I have added a collider on the "user's in-game character". The problem is that when I enable the ...
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2answers
200 views

How do I induce collision events in LibGDX 3D?

In the code below I've put an example of something I want to do. I have the camera and I want it to stop moving whenever it hits one of the boxes, how do I do this? public class Main extends ...
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2answers
983 views

Detecting walls or floors in pygame

I am trying to make bullets bounce of walls, but I can't figure out how to correctly do the collision detection. What I am currently doing is iterating through all the solid blocks and if the bullet ...
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1answer
431 views

Collision in PyGame for spinning rectangular object.touching circles

I'm creating a variation of Pong. One of the differences is that I use a rectangular structure as the object which is being bounced around, and I use circles as paddles. So far, all the collision ...
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3answers
615 views

How to flick gameObject using Touch?

I've been searching for a solution for my problem for a while on the web, but i didn't find anything that work properly What i want to do I have a bouncing ball and I want to let the user flick it ...
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1answer
399 views

Using Bullet physics engine to find the moment of object contact before penetration

I would like to use Bullet Physics engine to simulate the objects in 3D world. One of the objects in the world will move using the position from 3D mouse control. I will call it "Mouse Object" and ...
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1answer
450 views

LibGDX: Colllisions between bullets and enemies in arrays

I am writing a "Gauntlet" style game. So far I have managed to successfully detect collisions between my player object and my ghost enemy objects, and when they collide they drain the player's energy. ...
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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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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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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
76 views

Bounce with multiple collisions

Here's the problem: I'm writing arkanoid-like game in Unity 5.3. I'm using 3d physics and simply ignoring z-axis in computations. No gravity, 0 drag and velocity reset every bounce by script. My ball ...
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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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3answers
1k views

C# XNA AABB vs AABB collision resolution, AABBs ghost through each other

I've been learning a bit of collision resolution through a tutorial here and I can't seem to get the AABBvsAABB resolution working, I have CirclevsCircle and AABBvsCircle resolution working with the ...
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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
86 views

How to calculate distance of travel needed get achieve speed x?

I have a boat traveling at 20 meters/second approaching destination x. Destination x has a range radius of 10 meters. What I would like to do is make sure by the time the boat arrives within 10 meters ...
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1answer
147 views

Rigidbody stuck on the edge of two colliders

could You please help me with that weird bug? I've seen other people's posts about that bug, but I couldn't really understand how to fix it. As You can see, the boxes are standing right next to each ...
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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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1answer
64 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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0answers
42 views

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
134 views

Picking a 2D Box Collider with the mouse in Unity

I have a scene with a bunch of 2D doors that have 2d Box Colliders (no trigger) on them and that live on a Canvas. I would like to be able to click on them with the mouse, but have had no luck. ...
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1answer
110 views

Libgdx: Check collisions in Stage among actors

My goal is to check collisions among the actors that are in the Stage. My question is: is it necessary to maintain a list for each type of actor I have? Doing that I get 3 problems, 2 bad design ...
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1answer
277 views

How to detect collision position and that position's texture color in Unity?

I have a prefab and I use Circlecollider2D for physics operations. I want to detect the color of the contact position of the collided objects ? Is is possible by using Unity's collider classes ?
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1answer
132 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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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 ...
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1answer
82 views

How to use collision masks and overlap_area in pygame?

So, I've been prototyping a game, and I've been using sprite collision, and it's not cutting it any more. I read up on the documentation about masks and overlap area: https://www.pygame.org/docs/ref/...
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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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1answer
773 views

How do you set multiple collision rules with Swift and SpriteKit?

So basically I've got 2 types of balls and 2 types of enemies. Green can delete red only, red can hit delete only. Here's what I have for the first collision test: func didBeginContact(contact: ...
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2answers
176 views

Clip shadow frustum to scene bounds

I have a global light in my scene. It casts shadows using shadow mapping and has an associated camera (for rendering to the shadow map). I'm going to refer to it as my "shadow camera" from now on. I ...
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1answer
119 views

My “puck” model object falls right through the “table” model in jMonkeyEngine

So I am trying to learn jMonkey, I have understood everything so far, and I thought I understood how to make objects solid, so things can't go through each other. When I create my Collision shapes, I ...
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2answers
642 views

Basic 2d platform collision detection algorithm has a slight bug (Java)

I'm trying to implement collision detection between Player (the main character) and a Platform. They are both modelled as rectangles; when player hits the side of a platform he should bounce off it ...
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0answers
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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0answers
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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
265 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 ...
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4answers
153 views

How to do one-way collision?

I would like to know how can I do one way collision. It's the collision common in mario's games and many platforms. I try to do an code but I cannot post because it's part of a paid game. Basically I ...
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2answers
111 views

Detecting Collision in Next Step when Collider is rotating

In my Gamemaker: Studio game, I have a collision script for my enemy. The enemy is an alien, oSwarmer, moving through space which is also filled with drifting, spinning bits of debris. Some debris ...
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5answers
304 views

How to make sure that when two bodies collide, there is only one collision detection on box2d?

I'm using LibGDX with Box2D and, when two bodies collide, the collision is detected multiple times. Here's the code: public void preSolve(Contact contact, Manifold oldManifold) { Body a = contact....
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votes
2answers
182 views

2D Collision at corners using C# - without xna or unity

I'm trying to make collision for a 2D game, the player (car) has to collide with the walls of the track when it hits them. I looked into pixel color detection, and X,Y -based collision (But since its ...
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3answers
671 views

How to handle collisions without ugly conditionals and type checking?

(I asked a similar question, but this one is far more specific). How can I handle collisions without having to do a lot of type checking and if statements? People here suggested that when spotting a ...
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1answer
281 views

Collision detection doesn't register until player sprite jumps

I have implemented a shooting mechanic into my game, and the act of shooting works fine. The shooting work is done in my "game1" class. The issue that arises is when I incorporate collision detection ...
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1answer
73 views

Issue with detecting collisions in Pong

I've been working on making Pong in OpenGL and SDL and currently have both paddles and the game ball set up properly. I have an Object (or Entity) class which is used to instantiate each of the ...
0
votes
1answer
76 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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votes
0answers
24 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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2answers
308 views

Swift - How do I detect the exact point at which two “SKPhysicsBody(edgeFromPoint:” type physics bodies intersect in sprite kit

I have two physics bodies attached to two separate sprite nodes using Sprit Kit. One is a vertical line and one is a horizontal line: //sprite with horizontal physics body spriteMatrix[i][j]....
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1answer
96 views

Bullet: No Bouncing off the walls

I'm using Bullet Physics for Collision Detection in a first person game. The collision basically work fine, I cannot walk through objects. But if I walk against the wall and release the key I get ...
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2answers
142 views

Where should I save game object's attributes (hp, score) in Swift?

Scenario: I have a game with several game objects on screen. Each can have different score and hitpoints. When I use collision detection for cannonball vs. ship (example) I need to know which ship is ...
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1answer
61 views

Collision Between SKSpriteNode and SKShapeNode

Im trying to create a collision between to objects. one is a SKSpriteNode and the other is a SKShapenode. the Code I have so far for Contact is : func didBeginContact( contact: SKPhysicsContact) { ...