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

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123 views

Collision with player following mouse

I'm making a RPG with libGDX. I've loaded a TiledMap and now I'm implementing the player movement. The view is top-down. In my game I want two ways of input: one is using the ARROW keys to move the ...
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1answer
67 views

Collision between UI element and GameObject

When I first started to develop in Unity I followed the Unity Tutorial for the Space Shooter 2D game and used the knowledge from that to create something myself. Looking at it now it may not have been ...
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1answer
36 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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1answer
118 views

Two dimensional elastic collision of balls

I am trying to create a simple elastic collision simulation in java. (I am using some helper libs like StdRandom) Here is my Ball class : class Ball { double cx, cy; Vector velocity; ...
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1answer
481 views

Detailed Modern Opengl Tutorial? [duplicate]

I am asking for a specific modern opengl tutorial. I need a tutorial that does not skip to explain any lines of code. It should also include different independent objects moving/rotating (most ...
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1answer
138 views

How to retrieve vertex information from ID3DXMesh

I need to know the position of each vertex (and triangles) from a mesh (a pointer to ID3DXMesh, created by calling functions like D3DXCreateBox, D3DXCreateTeapot and D3DXCreateSphere) to perform some ...
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1answer
162 views

Ray & Segment Intersection

I'm writing some code to check intersection between all of a rectangles segments and a ray. It will sometimes use the Left and Right side of the rectangle as the closest face hit (face DA & BC) ...
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2answers
475 views

Collision detection between draggable object and world objects?

I have a game I'm making in Javascript that will involve combining items by dragging and dropping them onto each other. Think Alchemy or similar. So far, so good, but I hit a snag while trying to ...
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2answers
612 views

3D collision physics. Response when hitting wall, floor or roof

I am having problem with the most basic physic response when the player collide with static wall, floor or roof. I have a simple 3D maze, true means solid while false means air: bool ...
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2answers
946 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
425 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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2answers
394 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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53 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 ...
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3answers
573 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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3answers
186 views

3D collision avoidance: finding the updated velocity vector (outside the “collision-velocities” cones)

I am trying to understand and implement the mechanism of a fully 3D collision avoidance (steering behavior) system for flight movement (six degrees of freedom), currently focusing on circumventing ...
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1answer
348 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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4answers
3k views

Collision between AABB and Circle

I'm programming collision systems for a 2D game engine. The idea is that different systems can interact with each other. So one of the cases would be check collisions between axis aligned bounding box ...
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1answer
56 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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1answer
26 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
121 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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2answers
177 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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8answers
34k views

most efficient AABB vs Ray collision algorithms

Is there a known 'most efficient' algorithm for AABB vs Ray collision detection? I recently stumbled accross Arvo's AABB vs Sphere collision algorithm, and I am wondering if there is a similarly ...
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1answer
20 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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2answers
93 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
385 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
100 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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4k views

how get collision callback of two specific objects using bullet physics?

I have got problem implementing collision callback into my project. I would like to have detection between two specific objects. I have got normall collision but I want one object to stop or change ...
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1answer
251 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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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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0answers
16 views

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 ...
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1answer
171 views

How to detect collision only in non-transparent texture?

I am developing a game using libgdx. I am trying to detect the collision between bee and tube. I am using the following code to detect the collision. if(player.getBounds().overlaps(boundsBot)){ } ...
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1answer
218 views

Collision between a sphere and a mesh(height-map)

I am trying to implement a method that detects the collision between a sphere and a mesh and reflects the vector of speed. I have a method, that detects a collision between a sphere and a triangle and ...
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2answers
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How do I deal with abstracting collision handling code between entities with differing collision components?

I'm using a component based entity design with Components that hold the data and Systems that act on entities based on the components they have. Entities are registered to all systems as they are ...
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1answer
126 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
249 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 = ...
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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
129 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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111 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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4answers
112 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 ...
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2answers
622 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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1answer
70 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: ...
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1answer
21 views

Bullet: Apply any Transformation to RigidBody?

I'm using Bullet for CollisionDetection. I load a scene from a Collada-File using Assimp. Let's say I want to give every object in the scene a RigidBody with a box as CollisionShape. Right now I first ...
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1answer
277 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
675 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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1answer
234 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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1answer
20 views

Collision causing FPC to go haywire

I have created a first person controller as an enemy in my game (Zombie), my character is an Archer using Arrows as projectiles fired using: if(Input.GetButton("Fire1")) { shotForce += ...
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77 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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Swept AABB vs AABB Calculation Error

I'm having issues running simple AABB vs AABB collision detection. I'm able to successfully detect collisions without checking with velocity. But for some reason my code keeps prematurely firing ...
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2answers
172 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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1answer
34 views

In 2d, how do I discern when a character is on top of an object, from when it is on the side?

I am building an auto-run platforming game. I have code so that if the character collides with a wall, they are pushed back until they are able to get past the wall. Unfortunately, this means that ...