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 and where to handle collisions? [Java] [duplicate]

Okay, so in my game I have a Level class, which hold an ArrayList of entities. In addition to this, I store the Player here (naturally enough). In my Entity class, I have a method which checks for ...
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3answers
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2D Box Collision Trouble

Hello I am trying to handle some simple box collision (axis-aligned) in my top-down 2d game, but running into a problem. My game is running at a fixed time step, and checks for player-wall collision ...
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132 views

How should I improve my game world? [closed]

I'm in the process of teaching myself game development, and I'm trying to learn 3D, and started on a basic 3D game. The actual problem I've encountered is with level design, I'm using cubes all over ...
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98 views

Handling collision with LWJGL rectangles

I'm testing collision with other rectangles so I can implement it into my current project. The problem is the rectangle starts at the right x and y, but I'm not sure where exactly they are. I'm pretty ...
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1answer
52 views

In a collision detection loop, when do I apply the velocity?

I'm writing a really basic collision detection system (AABB vs AABB, AABB vs Circle, Circle vs Circle), and I've just got to the point of writing the actual loop which iterates the objects and checks ...
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178 views

(LibGDX/JAVA) How can I get a rectangle to rotate with this pendulum so I can start detecting collisions?

One of the objects in my game is a pendulum that swings in a semi-circle. This is done by having an update() method like this: public void update() { angleAcceleration = +1.81 / length * ...
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72 views

Unity material is missing after compilation

I have a piece of code that signals the player that a projectile has hit its target. Everything works fine during the playmode, however after I compile it, it acts as if there was a missing material. ...
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2answers
215 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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650 views

Creating a custom collider shape in unity, and performance concerns

I want to create a custom chaped collider in unity to create point-defense triggers for objects. I have a spherical collider that triggers for attacking objects that enter it already. However I want ...
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1answer
100 views

Collision response callback

First at all, I'm not asking how to handle or detect collision. I already have that. My actual situation is, I have a system collision and I detect the collisions. Every collision detected is store ...
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1answer
109 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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How does one perform collision detection on objects made of many small triangles?

I understand that any shape can be created (or approximated) by smaller triangles. Any rectangle can be created by 2 smaller triangles. Any circle can be created by many thin "pizza slice" triangles. ...
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3answers
217 views

Detect if two objects are going to crash

i am working on a car game where i am to create an AI, in the game there are other cars and a few objects moving around that i do not want to crash with, i have the speed, position and direction of ...
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0answers
264 views

Using Box2D in LibGDX, is there a reason a fixture set to be a sensor would only -sometimes- detect a collision?

I am working on a 2D game in LibGDX. Currently, I am testing interactions between a player's weapon and enemies - in particular, a sword and an enemy monster. The player has a hurtbox and the sword ...
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1answer
312 views

After collision of two objects change the sprite and move in its direction

I've searched a lot for this question but there was no answer that could solve the problem I'm having. I'm new to unity and a very naive developer.I'm making a game in unity using c# and it's like a ...
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2answers
681 views

onCollisionEnter2D not behaving as expected

I have two game objects. They both have a Rigid Body 2D and a Box Collider 2D components. One of them also has script component. Below is the full script using UnityEngine; using System.Collections; ...
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2answers
103 views

How can I get the “SelfActor” in OnBeginActorOverlap?

The signature it takes is void ( AActor* OtherActor ) However, The actor that is handling this event is not involved in the overlap. How can I access the actor that owns this delegate? Assuming I ...
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2answers
74 views

Subdived objects in different shapes

Currently I'm working on an Android OpenGL 3D game and now I want to implement a collision detection. For this I want to use oriented bounding boxes but here is my problem. For a normal oriented ...
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1answer
83 views

Fast(er(est)) fullscreen/scene collision detection technique (“selection buffer”)

My vertex format has a float4 Flags element used to pass miscellaneous data to shaders. Each mouse-collidable object that is rendered has a unique ObjectID that is written to an ObjectID-rendertarget ...
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1answer
98 views

How can I split up a large model into an octree codewise?

For collision detection, I am attempting to split up a large model into an octree. If we take this black thing thing to be the ship (104,000 vertices): Then I would like to split up the faces I ...
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1answer
348 views

Fast mesh collision 3D (C# XNA)

I'm trying to write a simple program where a 3D landscape can be walked about with a basic camera. However, I've found it very difficult to do even simple collisions with my terrain. I'm wondering if ...
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1answer
481 views

Handling (spawning/removing) entities in SFML

I am unsure which method to use to handle my enemies in SFML. The idea that I am trying to recreate is to spawn enemies every so many seconds. Initially I wanted to do this using a vector such as ...
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60 views

resolving per pixel collision issue

In space invader, I'm doing bullet to barrier intersection using rect to rect, then I'm testing the first bullet's impact pixel, if it's green I blast a circle, if it's black, it continues travelling. ...
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1answer
60 views

How to implement this collision detection function?

I would like to know how to implement this collision detection function, but I'm not even sure what it's called. The input shapes are 2D convex polygons, with an optional "rounding radius": imagine ...
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1answer
84 views

missiles skip in collision detection

I'm trying to work on spaceinvader. I have problem that missiles or the bullets skip frames due to its fast speed. I tried to use the previous position of the bullet in the collision check, but still, ...
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3answers
1k views

Fast Ray Sphere collision code

I am looking at here and while it's well organized a lot of links are broken: http://www.realtimerendering.com/intersections.html I am trying to find fast code that will give me the hit point and the ...
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2answers
263 views

Moving OBB vs. triangle intersection test

Requirements: to write a test function that, given a moving OBB (oriented bounding box) and a triangle, returns true whenever the OBB hits the triangle. The OBB is described by its half extents (h1, ...
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1answer
442 views

OnCollisionEnter2D incorrect contact point?

I am trying to shoot a bullet (rigidbody2d, boxcollider2d) to another enemy object (rigidbody2d, kinematic, circlecollider2d). I want the collision point between these two. When they collide, i want a ...
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1answer
288 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 ...
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1answer
160 views

Unity Collision Difficulties (How do I make a ground in unity with lots of pieces that doesn't have poor collision?)

So I'm working on this game that I came up with the idea for while watching the Unity Roll-a-ball tutorials. So it's probably important to note that I'm extremely new to game design and I don't have a ...
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4answers
2k 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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0answers
32 views

Colliding wiith a smooth line of blocks

I'm having a strange problem. I'm creating a 2D platformer, and creating the gameplay map by reading a csv file and placing prefabs of the appropriate type on map. One part of the map is a simple ...
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1answer
35 views

Collision detection using gluunproject

I recently came across the game turbo tunnel. I want to make a similar game. only thing that stands in my way is the collision detection. I first thought of learning plane line collision detection. ...
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2answers
241 views

Help with Resolving Pixel Perfect Collision

Hi I'm having trouble resolving "Collision detection between axis-aligned bounding box and bitmap (pixel perfect) terrain on a Worms type game". (Read previous question to find more information about ...
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1answer
77 views

How do I make a time lapse in my code so it updates slower?

I have made some collision if statements, but they didn't work. birdbox3.X += 5; birdbox3.Y -= 5; if (birdbox3.Intersects(Banner1)) { birdbox3.Y ...
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1answer
176 views

Collision Detection algorithm using Line Detection

For a 2D physics sandbox I am working on, I need a way of detecting detecting a collision using lines. This sandbox uses a class called Particle, which has a x and a y (stored as a struct called ...
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2answers
427 views

Breakout Collision Detection: Ball gets trapped inside block

I'm writing a breakout clone where blocks to hit can be of various sizes and the projectile can move at different speeds, and I seem to be having some trouble getting the collision detection perfectly ...
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2answers
276 views

How to resolve collision between a dynamic AABB and static AABB?

I wanted to ask, how do I resolve collision between 2 cubes - in my case I want to push a moving / dynamic cube (used for the player) out of another static cube (used for the floor or objects in the ...
2
votes
1answer
148 views

Collision detection between axis-aligned bounding box and bitmap (pixel perfect) terrain

Working on a Worms-type game, I have my objects in bounding boxes and they sit on the pixel terrain. Currently I am able to successfully do the collision detection for objects when they enter the ...
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1answer
208 views

Rotate a plane defined by its normal and its distance

First apologies for the amount of pictures, it's a bit hard trying to explain my problem without pictures. Hope I've provided all the relevant code. If you feel you want to know about how I am doing ...
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2answers
2k views

How to stop objects pushing each other away on collision?

I'm creating something along the lines of Super Smash Brothers. There's a problem with the collision between the two players and projectiles. We have rigid body on the characters and projectiles and ...
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2answers
612 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
276 views

Get normal dependent on collisions position

As I hask ask here I'm working on how my objects can move over the terrain and other objects. My proposal and also an idea in the answers was to calculate the rotation from the object with the normals ...
3
votes
2answers
216 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 ...
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votes
2answers
186 views

How to move a car over an environment

At the moment I'm writing a little OpenGL application. For now I have a car which can drive down a road. This works really good because I simply put the car on the street plane. Now let's say on the ...
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votes
0answers
116 views

How can I handle ball interaction with lanes in a pinball game?

In a pinball game, how can I handle collision or constraints on the ball for convincing movement on those highway rails/tracks? I assume using physics and a mesh collider would not work, even when ...
0
votes
1answer
217 views

3D OBB vs OBB Collision Detection and Response

I need to know how to do collision detection and response for 2 3D OBB objects. I will also need to be able to have certain objects disabled (no collision, incase I need to test something like a ...
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0answers
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Collision Detection Between 3 or More Objects

Say I have a 2D grid of particles, and I wanted to find out if any of them were colliding. In my head I have come up with a system where you check every possible location for each particle in that ...
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2answers
183 views

Collision detection with moving tilemap

I have a player whose who's sprite is 48* 32. I know the player's position. The player can move up and down based on user input. I have a tilemap which moves. Here is an example of the array I use to ...
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1answer
69 views

how to determine wall direction with information of normal and incoming direction

what is formula ( and theory behind) used to determine wall direction with only knowing the normal of wall and incoming direction object. in this thread example :Collision detection - Smooth wall ...