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

learn more… | top users | synonyms (2)

0
votes
1answer
88 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 ...
0
votes
2answers
208 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 ...
1
vote
3answers
204 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 ...
1
vote
1answer
577 views

Is it possible to tile box colliders without causing “false” collisions in Unity3D?

This is in regards to something like a sidescroller where you have a tiled map where each tile uses a 2d box collider. If you use a 2d circular collider as an example for your character, as it rolls ...
3
votes
1answer
254 views

Acute corner - Collision Detection

So I have set up a Swept test for AABB vs Line Collision that works fine, now the problem is that I have to deal with acute corners, where this happens: As you can see the AABB just falls through ...
1
vote
1answer
131 views

How to determine whether a line intersects any other?

I have a collection of lines: List<Line> _lines; Each has the properties: X1, X2, Y1, Y2 How can I determine whether any given line in the list (Line[n]) intercepts, at any point, any other ...
0
votes
0answers
69 views

Collision detection in JavaScript Canvas game - Issue with 'if' statements [duplicate]

I am currently developing a simple browser-based game and seem to be on the cusp of collision detection that doesn't just return the player to where they were before, but actually will slide them ...
1
vote
3answers
141 views

How Efficiently preform collision detection in NxN rectangle grid

i have simple level that constructed from NxN rectangle grid some of the rectangles are walls and some of them are the path the player allowed to move only on the path they are also rectangle from the ...
-2
votes
1answer
127 views

How can I get “Good enough” collision for entities? [closed]

I am developing a Pirate ship fighting game. It's a great concept: Ships firing cannonballs, sinking each other, having to work as a team to complete the mission... But.. I've tested it with about ...
0
votes
0answers
28 views

Play soundeffect only once?

I am creating a game in XNA and when there is a collision between two objects a siren will sound. I have pixle-colliding between the objects and if several pixles collide the sound plays several times ...
0
votes
0answers
24 views

How does collision detection work? [duplicate]

I was curious on how hit collision works in games. I know there is a simple method that gives every object in a 2D or 3D world a recengular hitbox that makes it easy to detect a collision, but when ...
0
votes
0answers
74 views

Java Collision detection

Hello have a game where you look for key cards. Which allow you to open certain doors. for example if u have a red key card you can open a red door. The problem is that when I don't have red key ...
0
votes
1answer
102 views

How to calculate rect-moving-in-a-curved-path collision detection

I'm trying to find the best way to use collision detection for a rect moving in a curved path: here is example of what i have I found few methods and I have hard time to find what is the best way. I ...
12
votes
6answers
2k views

What's the fastest way checking if two moving AABBs intersect?

I have two AABBs that are moving, what's the fastest way to check if they will intersect under a frame? By moving I mean not just to check with the usual rectangle intersection method, I mean some ...
1
vote
1answer
90 views

Applying statements to a single instance in Game Maker?

I'm currently in the process of making a platformer, and am currently in the process of creating "depth" into my game, by making Up/Down-W/S control your depth. (Come closer to screen, go further). ...
0
votes
1answer
103 views

Ray->triangle collision math seems to not work?

First time asking, pardon any mistakes I make :) I am programming a game from scratch, and the collision detection is giving me issues. I have AABB in place to check proximity, and if that reacts, ...
0
votes
0answers
64 views

Gravity around a sphere with rotation? (Blitz 3D)

I've been making this space/moon type FPS game with Blitz 3D and I can't seem to get gravity working perfectly. Right now, it works, however when I go farther on the moon, I see that my character is ...
1
vote
1answer
59 views

GJK point-in-tetrahedron - capping the number of searches?

The very informative mollyrocket video has given me quite a lot to work with, but one thing that the video seems to suggest is that the algorithm should ideally run until it definitely determines ...
0
votes
2answers
257 views

Accessing colliders from one script C#

I want to access specific colliders(to see if they are been clicked) from one script insted of making multiple scripts for every collider.How? I am using unity. using UnityEngine; using ...
1
vote
1answer
173 views

Set box collider size in meters instead of percents

TL;DR: Can I set the size of a collider in meters instead of fractions of the size of the object it's in? I'm implementing a classic NES game, and my scale is 1 meter = 16 pixels. I have an 8x1x1m ...
0
votes
1answer
55 views

Why the triangulated body in box@d as a sensor is not treated as one but separate triangle bodies?

I am making simple game - kind of race game, where you see from the "sky" your sprites with circle Box2D bodies attached and they have to move along some path/track. My idea was to detect if they will ...
0
votes
2answers
232 views

Unity2D Collision Issue

I have a crate setup (in pic below) with a rigid body component, box collider and 3 circle colliders(they allow me to push the crate most of the time without getting stuck on the floor textures which ...
2
votes
3answers
156 views

Box2D Issues determining the side of collision

I'm trying to determine which side of my object a collision is happening. In all of my searching, I have found 2 different proposed solutions, but each one has a major issue. I'm hoping that someone ...
0
votes
1answer
54 views

How to reposition a bouncing ball after it has passed through a surface

I have a bouncing ball which can collide with lines of a random slope. The ball passes through the lines a bit and I need to set the ball back some distance from the line. The ball (defined by ...
0
votes
1answer
94 views

Is the standard collision detection in Slick2D too heavy for broadphase?

I was wondering two things about the built in shape detection of Slick2D. When executed on a lot of shapes, how performant are the intersects and containsmethods, and what kind of algorithm is behind ...
0
votes
1answer
159 views

How do I calculate the bounce vector of a ball hitting the starting point of a segment?

I have a ball (with parameters x, y, radius) that travels on the screen (with vectors directionX directionY) and can collide with a segment with random slope (with parameters startX, startY, stopX, ...
0
votes
2answers
99 views

Stuttering Character When Colliding With Wall XNA 4.0 Help!

I'm trying to make a platformer game without tiles. I've made a collision handler to handle collision between Player and Stage(platform)and a collision checker, here's the code: public void ...
1
vote
1answer
174 views

Separation of axis theorem implementation at normals

This might be more of a math question, but it relates to the development of a simple physics engine I am trying to create. I have been stumped on this for about a week now, and have been unable to ...
0
votes
1answer
67 views

Array Rectangle Collision Handling Inconsistency XNA 4.0 [closed]

I made a simple collision detection prototype.Here's the code for the Player class's collision handler: public void handleCollision(GameObject OtherObject) { ...
0
votes
2answers
133 views

Unity2D Best way to determine degrees between two colliding entities?

I'm trying to determine the collision-direction between two objects. I'll be using this for various things such as creating blood-entities in a specific direction proportional to where the other ...
0
votes
0answers
63 views

Calculate hit-normal from collision

I am trying to implement a swept test collision between an AABB and a Line Segment and I found this implementation working great ... Except that it doesn't cover how to calculate the hitNormal and ...
3
votes
2answers
942 views

Do resolution settings have any impact or give any advantage in online FPS games?

There is this crazy theory that has always bothered me. I am not after a technically but more theoretically (although technical knowledge is required to) answer; Two friends are playing the same ...
0
votes
1answer
100 views

Unity: Object is underneath another object but shouldn't be

I have a simple collision detection program. The red object is controlled by the user and the yellow object is always moving up and down: However, when the objects are supposed to collide, the red ...
1
vote
2answers
79 views

XNA/Monogame inverting a BoundingBox

I have a box that is drawn around my game that I want to check collisions with. Currently my BoundingBox is made in a way that whatever is inside the box is colliding with it: BoundingBox bb = new ...
0
votes
2answers
230 views

Collision Direction Detection

I'm making an RPG game where players and enemies can collide with walls. Right now it pushes the player off the wall when he tries to 'go through' it. However, I detect which way he should be pushed ...
0
votes
0answers
13 views

AS3 - Unit Collision [duplicate]

I am trying to make a bird view strategy game where you Control units by clicking on them and then right click to make them move to the mouse. The problem is that when you select multiple units and ...
3
votes
1answer
101 views

Might this alternate circle-circle collision test help performance?

Preface: I’m no gaming pro…I code business apps, but I’m experimenting with game coding this Christmas. :-) I want to detect collisions between 200+ circles of different sizes which are moving at ...
0
votes
0answers
214 views

Help slope tile collision platformer (XNA/C#) 2D

I have been creating a platform game in C# and XNA, everything works pretty well least the slope (down left and right). This is the project that I have so far. PlatformGameEngine.rar if the ...
1
vote
0answers
267 views

2D AABB vs AABB side of collision and collision depth

I realize there have been a multitude of questions involving 2D AABB vs AABB collision, but the questions and responses always avoid the simple questions that make it difficult. To keep things ...
1
vote
1answer
116 views

2D Collision : detection and design [duplicate]

So, listening to this very smart piece of advice, I've already completed a basic Tetris game. Moving on, I started a small breakout. But suddenly : a nightmare came. Collisions. Since I've been ...
0
votes
1answer
80 views

Handle Entities & Collision in large numbers [closed]

I am creating a simple 2D maze game and I am a little confused about entities & collision detection. At the moment, my entity class is an abstract class containing position, velocity, sprite and ...
0
votes
2answers
110 views

Collision detection enhancement

I am developping a spaceinvader-like game. There comes the problem of how to handle collision detection. At first I was doing like that : forEach(fireBall : fireBalls) { forEach(stormTrooper : ...
1
vote
1answer
61 views

Libgdx--how to store every single point drawn using touchdragged?

Basically i am trying to detect line collision. The problem is when intersection occurs quickly(touch dragged is done quickly like fling), the collision is not detected. It seems as if 'touch dragged' ...
1
vote
2answers
163 views

Collision detection between triangle and polygon

I have some difficulties to understand how to be sure if there is a collision between a space ship (black) and an asteroid (in blue). A space ship is placed on a case and an asteroid comes from the ...
2
votes
1answer
205 views

2D collision of thrown objects in Unity

I am currently working on a game inspired by traditional 2D Zelda games ("Link To The Past", etc.) in Unity using the 2D settings. I am looking for the best way to handle objects that the character ...
2
votes
1answer
155 views

How do I detect a line collison in LIBGDX?

I am drawing a continuous line using Pixmap. I want to check for a collision / intersection of my line with the already drawn line.
2
votes
1answer
221 views

Why do my Box2D collisions fail when I have multiple fixtures on one body?

I'm creating my first libgdx / Box2D game where a player moves around using a mouseJoint. My player has two fixtures, "main" and "question". For some reason when I have these two fixtures, my player ...
0
votes
1answer
106 views

c++ - collision detection/resolution clipping

I'm trying to implement a collision detection system, and it is working for the most part, no overlapping (or at most very little overlapping) of characters, and wall collisions. The problem is that i ...
1
vote
2answers
193 views

Optimizing Collision Detection in a 2D Game

I am optimizing my "little" Java (LibGDX) shooter game, and perhaps unsurprisingly, collision detection is a "bottleneck"; I've kind of reached my performance goals already, but I want to tweak the ...
1
vote
2answers
324 views

Collision between Mesh Plane and 2D Sprite

I've just recently started programming using Unity and made a couple of games with it, I'm trying out more and more advanced stuff as I do more games, but right now... I'm trying to make a game ...