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

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Check if body is on the ground

In my game I have an quite irregular terrain at the bottom and a round ball which can be controlled by the keyboard. Is there any way to check, if the ball is currently on the terrain? This is very ...
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2answers
276 views

Bounding volume hierarchy - linked nodes (linear model)

The scenario A chain of points: (Pi)i=0,N where Pi is linked to its direct neighbours (Pi-1 and Pi+1). The goal: perform efficient collision detection between any two, non-adjacent links: (PiPi+1) ...
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3answers
103 views

Ball oblique impact physic in Java?

I know Q3 + Q4 = 90 I searched internet and many physic topics, but not found how to calculate this values in Java? (I found V3 and V4 but not found Q3 and Q4) So how can i calculate V3, V4, ...
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2answers
3k views

Tiled based map collision detection problem

I'm working on a tile-based Mario clone. This works all fine when walking and falling. But when the player jumps near a wall and walks to the right in the air, then the player get stuck on the wall. ...
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1answer
1k views

Implementing jumping and heightmaps in 2D RPG/Adventure style games?

I've been putting together, albeit slowly, a traditional style game engine in flash/AS3 along the lines of Alundra/Final Fantasy 3/etc etc.. Everything so far is working smoothly (maps from XML data, ...
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2answers
331 views

doubts in circle circle collisions [duplicate]

Possible Duplicate: two balls stick together in a pool game? I have problems in circle circle collisions in a pool ball game.. The game has problems like the circles (or balls) stick ...
2
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1answer
349 views

How do games using physic engines for 2d games handle platform corners?

I have seen games like latest "2'5D" sonics that handle collision detection at platform corners pretty well. The problem I'm having is that my game uses an ellipsoid as my player's body to let it move ...
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1answer
65 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
687 views

How do I make a sprite collide with walls in pygame?

I've been trying to create a collision detection between the player (Blue), and the walls (Green), but the player can just move through the walls. I made it so that every collision is printed in the ...
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2answers
41 views

BoxCollider not blocking other object(s)

I'm really newbie , watched about 20 videos about and tried to do something. But I still have problems with collisions. I'm working on 2D. I have a Sprite and a Cube (GameObject>3D Object>Cube). ...
8
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2answers
105 views

How do I prevent raycast car wheels sliding sideways?

I've been writing a non-realistic car physics engine as a learning exercise, using this article as a reference. I have a car that correctly collides with a terrain and applies the correct suspension ...
1
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3answers
79 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 to bodies collide collision is detected multiple times. here's the code `public void preSolve(Contact contact, Manifold oldManifold) { Body a = ...
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1answer
27 views

Is it possible in Unity to Flip a 2D Sprite Without Flipping the Object it is Assigned to?

I 'built' (followed a tutorial) on a collision detection system, and when I flip the object to go left and right the collision messes up. So I have three options; find a way to modify the collision ...
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2answers
470 views

Wall jumping collision detection anomaly

I'm creating a game where the player ascends a tower by wall jumping his way to the top. When the player has collided with the right wall they can only jump left and vice versa. Here is my current ...
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2answers
368 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 ...
3
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1answer
184 views

How do I make my main character move towards an object? LibGDX/Java

What I want to happen is for my player to bounce from spring to another. For example take the illustration below: Here's my code (what I've tried to do so far). This gets called in an ...
0
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2answers
120 views

Game lags when my player collides with a specific object (solution known, unsure how to implement)

I'm developing a game in Android using LibGDX (although this is more of a JAVA problem than an engine problem). My aim is to have my player bounce off one spring onto another that will eventually take ...
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1answer
70 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
217 views

Determine wheter an octree node needs to be continue

For collision detection (moving vs. non-moving) in my current project, I decided to implement an octree approach after the preselection. The only collision detection I'm currently using is a ...
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4answers
101 views

Implementation of collision in 2D platformer (C++)

My collision system for my game currently works fine, it lets me test a collision with an entity or specified rectangle... but that's not enough. I used to use GameMaker and it had collision events in ...
0
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1answer
103 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 ...
5
votes
4answers
4k views

2D Collision in Canvas - Balls Overlapping When Velocity is High

I am doing a simple experiment in canvas using Javascript in which some balls will be thrown on the screen with some initial velocity and then they will bounce on colliding with each other or with the ...
2
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1answer
78 views

Best way to deal with Collision in JavaFX

This question I'ts no exactly a fix for the current game I'm working on, but I am showing it as an example to explain my problem. I just want to know the best way to handle collision in JavaFX. My ...
4
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1answer
75 views

Predictive Collision Detection - Find Time Of Impact

I have a green box at a starting position A. It can move along two paths A to B is linear motion A to C is under the influence of gravity (non-linear) The thin vertical line is a fixed ...
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1answer
196 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
117 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 ...
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1answer
29 views

Where to put the screen dimensions to make it accessible for all on screen objects?

I'm starting game development to learn a new language (SDL2, C++) and would like some opinions on the best way to handle a probably very basic problem. I don't want my player to go off screen, so I ...
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1answer
199 views

Adding a small slide when player releases left/right key

The aim is for the player object to slow down and stop instead of just stopping dead. The following codes works ok when the player is not jumping, but gets stuck in an object if the player is in the ...
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0answers
24 views

XNA4\ Monogame 3d Collision detection Help please

i have been trying to get 3d collision working for a while and i think(hope) you people can help me so for my project i have created a 'sprite3d' kinda class which is called ModelEntity and there ...
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2answers
95 views

Why does player still leave map?

I'm making a simple HTML5 RPG in pure JavaScript likened after Nox, Diablo or Titan Quest, with the character centered on the screen and the map moving around it. TL;DR: My character, when colliding ...
2
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1answer
98 views

Smooth Wall Collision Detection

I've been working on a small game, and I've been stuck on the collision part. During the collision, when my player hits a block, he stops just as it should, but it then doesn't allow me to another ...
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3answers
74 views

Collision Detection/Response Issues in Unity

Sprite A: Box Collider 2D and Rigidbody 2D. Sprite B: Box Collider 2D. Both sprites have a Sprites/Default material with Pixel Snap enabled. The textures being used are set to Truecolor Format and ...
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1answer
42 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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0answers
14 views

Platformer Tile Map Collision Help

I've been working on a small platformer as a simple project but, I'm having troubles with my collision detection. What I want is that as the player falls due to gravity, it will stop when it touches ...
0
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1answer
486 views

Game object position issue in unity3d

I have a set of objects placed on the same layer where all the objects are invisible except one. When I drag an object into a selected area, the current dragged object gets destroyed, and the object ...
0
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1answer
22 views

simplest way to detect collision with two bitmpas on android surface view

as title said. I have looked all over and havent found standard way to detect collision between two bitmaps on surface view. I tried intersect method with two rectangles, but didnt work. `practiseA ...
3
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2answers
1k views

2D Rectangle/Circle Continuous Collision Detection

I'm looking for a fast 2D continuous collision detection algorithm for circles and rotated rects. It needs to determine the time of collision. Both shapes may be moving at high speed, so the ...
0
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1answer
26 views

(Unity) Drag and detect object below when dropping

I'm studying game development in Unity and I want to create a idle/clicker game like Cow Evolution. I'm using OnMouseDown, OnMouseDrag and OnMouseUp to move the GameObject around the scene. Now I ...
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1answer
68 views

LibGDX - Tilemap Wall Collision Detection Issues

I cribbed some code from another web tutorial (SuperKoalio - https://github.com/libgdx/libgdx/blob/master/tests/gdx-tests/src/com/badlogic/gdx/tests/superkoalio/SuperKoalio.java) about detecting a ...
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2answers
30 views

On key press, spawn a collider where my player is facing?

I'm trying to create an attack mechanic to my player hero in my 2D Tower Defense game. When I press the Q button I want my hero to do an animation and spawn a temporary collider shaped as a cone at ...
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2answers
37 views

unity onCollisionEnter does not work

I know this question has been asked several times but none of the answers solved my problem. I made an sphere and gave it rigidbody. then I draged the sphere on to a new made prefab. on mouse-click ...
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1answer
111 views

Determine if Plane is seen by Camera

If I have an arbitrary plane (center and normal) or a quad (center, normal and width and height) and a camera (frustum, projection & view matrix, etc). Then how would I go about calculating if the ...
0
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2answers
868 views

How do I add a Rigid body and a box collider component to a Texture2D?

I am making a snake game. I'm basing it on a basic tutorial game, which does no collision detection, wall checking or different levels. All snake head, piece, food, even the background is made of ...
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3answers
606 views

Find closest point on NavMesh if current target unreachable

I have a mock environment set up with a cube that has a specified "Not Walkable" layer. I'm using NavMeshAgent and NavMeshPath to set destinations of the player. The way I'm setting paths is by ...
1
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1answer
49 views

Is my collision-free location script working?

I've recently been learning C# and I wanted to take one of my 2D tutorials to Unity. I reached a step where I need to spawn my new sprite into a collision free location. I've followed direction - ...
0
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1answer
119 views

Libgdx using Box2d with TiledMap to create collision detection

I'm fairly new to Libgdx and have some good basic knowledge on Java. Right now I am stuck on how to add collision to my TiledMap, I am using the Mapeditor to create the tilemap. I read so many ...
4
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2answers
150 views

Best way to handle cornering in a 2D maze game?

I want to implement smooth cornering in a grid, much like Pacman moving in his maze. A big difference with Pacman, my characters can stop- thus the player has to keep pressing the controls to keep ...
1
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1answer
439 views

Using PhysX, how can I predict where I will need to generate procedural terrain collision shapes?

In this situation, I have terrain height values I generate procedurally. For rendering, I use the camera's position to generate an appropriate sized height map. For collision, however, I need to have ...
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1answer
81 views

How to implement angled surface?

I'am trying to implement 2D platformer game inspired by N game. But the problem is I have no idea how to implement something like this: I have two ideas of how this could be implemented but i ...
0
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2answers
114 views

Double buffer - Managing Collision

I'm thinking about how I should manage collisions in my game. I'm thinking about having a "Collision" class that checks for collision, and in case takes actions to resolve them. My problem is this: ...