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

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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
90 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
35 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
56 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
55 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
84 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
48 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
80 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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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 ...
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1answer
62 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
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 ...
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0answers
78 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
26 views

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
29 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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2answers
60 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
108 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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1answer
33 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
34 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
31 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
31 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
140 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
4k views

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
131 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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1answer
35 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 that uses arrows as projectiles that are shot with the following code: if(Input.GetButton("Fire1")) ...
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38 views

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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1answer
36 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 ...
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1answer
100 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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1answer
32 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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0answers
63 views

Weird Collisions in ODE

I'm trying to get a basic OBB/OBB Collision System working. For this I use ODE. My problem is: Whenever I use the dSpaceCollide and pass in my Space and my Callback, my Callback shows me, that a ...
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1answer
28 views

Convert Triangle/OBB Test to OBB/OBB Test

I'm using the collision library OZCollide (http://www.tsarevitch.org/ozcollide/) and I want to do OBB vs. OBB collision tests. The problem is, that this function doesn't seem to exist (see my other ...
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1answer
128 views

Frustum culling takes ages c++

I have two ways of doing frustum culling taken from different web sources. First one takes 200ms to check 10k AABBs, second around 50ms for the same box count. I read some forum answers, people say 0....
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1answer
67 views

Player collision with object

so I have an fps controller, and I want to change camera when it collides with a box collider. I think I did it properly but it didn't work. Here's my code. using UnityEngine; using System....
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0answers
64 views

Side-Collision for Breakout game where ball moves fast

So I've been trying to make a breakout clone, which is my first attempt at a graphical game, I ran into some problems, and was hoping that this community could help me. I've got most of the mechanics ...
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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 ...
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1answer
93 views

How do I create a custom collision map for clickable areas on a map?

Say I had a map like the one displayed above. What would be the best method of creating a collision map for each individual state where I can click individually?
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28 views

OBB Collision Intersection Problem

I'm trying to create OBB's around objects and then collide them using DirectX 11 and C++. It all works fine until I rotate one (or more) of the boxes and then the collision detection returns true too ...
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1answer
43 views

Collision Detection Unresponsiveness

I'm creating a simple jumper game in Libgdx that makes the player jump over obstacles in order to stay alive. The only problem is that the collision detection for when the player just touches the ...
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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 ...
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2answers
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How to pass the snake to pass through one side of the screen and come out the opposite side in c# game?? Help me :(

How do I code the left and right collision, and also tell me how I can set the collision of snake according to the form size. If i want to change or maximize the form, snake should collide with the ...
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0answers
47 views

OBB/OBB Test in OZCollide

I want to know if anybody, who tried OZCollide (http://www.tsarevitch.org/ozcollide/), knows whether OBB vs. OBB Tests are possible or not. I know there is a AABB vs. OBB function but I can't find one ...
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0answers
25 views

libgdx - Math reflection to the correct direction

I'm using a simple reflection system, but the game doesn't work how I want. How should this game work? The game has two boxes. A red side and a black side. The player should only sort the bombs to ...
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0answers
210 views

Collision detection with Physics P2 in Phaser.io

had written this thread that relates to a project I'm developing while trying to learn phaser. I could really use some advise/ feedback on making the user experience a bit more easier as I seem to be ...
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0answers
11 views

Clicking an entity with transformation

I am trying to understand how best to implement a click detection function in a 2d JavaScript game. I can demonstrate using a simple example of two square 'entities' which can be selected when ...
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0answers
44 views

Make Kinematic P2 Body collide with world bounds

I have a P2 object( A) with a custom bound that detects collision with another P2 object(B ). However, object A is set to be kinematic rather than dynamic as I do not want object A to react to ...
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3answers
114 views

C++ Platformer Collision

This is very simple, but I have spent nearly 6 months messing with this and it is always messed up. This is a tile platformer, everything is "normal", x and y correspond to tile. Tiles are 32 x 32 ...
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0answers
88 views

Phaser - Add collision to a specific tilemap layer?

In Tiled I made two layers, "Background" and "Walls" and I have positioned them accordingly, both as a background and walls, or if you prefer "Not being able to collide" and "Being able to collide". ...
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1answer
256 views

libgdx - Math for wall collision when adding velocity

I've created a game which spawns a random colored ball in the top or bottom of the screen and moves to random direction with this method. private Vector2 position; private Vector2 velocity; private ...
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0answers
189 views

c# adding object collision to multiple objects

I'm trying to make a mario, platformer type game, and from following a tutorial, they've done the collision like this, but im wondering if there is a simpler way to it since I want to have collision ...
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3answers
62 views

Tiled height level collision

I have created the below tilemap in tiled and I am wondering about a good approach to "separate" these two different heights in the map. I would like to keep it tile based, so adding a object layer ...