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)

2
votes
0answers
79 views

Why is OnCollisionEnter2D called when it's layer's collisions are being ignored?

I'm sure this is down to my lack of understanding of the unity physics system. I'm trying to implement a simple one-way platform for a 2d game and have got stuck on creating a reliable way to let the ...
2
votes
0answers
187 views

Collision detection with an irregular curve

I'm building a custom physics engine to accompany a level-editor. This image shows how the level-editor outputs levels: Now, some explanation is in order. The curve is defined by the red points. ...
2
votes
0answers
510 views

Collision with RigidBody

I am currently working in a project with UDK and I have a problem with collision. I have a Crate who is a kActor in RigidBody physic and my player who is a Pawn. When my player move and go in ...
1
vote
0answers
25 views

Manual response when 2 shapes made of rectangular volumes collide

I have 2 compound objects made of rectangular blocks. One of them (the one that is moving) has a script that listens to OnTrigger callbacks. What I need is to position the moving compound object on ...
1
vote
0answers
25 views

Drag and drop in Flare3d

Now iam working on drag and drop prototype in flare3d.I have a f3d object and have different boxes to place the parts of the f3d objects . when i drag the parts of f3d object towards the boxes,if ...
1
vote
0answers
130 views

How do I detect collisions between a particle-based net and a ball?

I've implemented a net using Verlet integration and many points connected with constrains; like this demo, but in 3D. I want to implement collision detection between this net and a ball (like in a ...
1
vote
0answers
90 views

How do I implement melee hit boxes for a top-down game?

For a 3D top-down game, how should I handle collision in melee combat? My game has no targeting system, so I can't use a simple distance check between attacker and target. What I am thinking is have ...
1
vote
0answers
56 views

A problem with collision when a sprite changes size (Phaser framework)

I have a sprite in my game that changes size at certain points in the game. It changes size via the sprite.body.setSize method. Unfortunately, it seems that the sprite is unaffected by objects that it ...
1
vote
0answers
99 views

Collision detection implementation suggestions

I'm working on a simple 2D game involving a rotating octagonal ring where a sphere sprite moves up/down avoiding objects as the ring rotates faster and faster. I'm having a difficult time with the ...
1
vote
0answers
38 views

How to handle car game circuits in a top-down view?

I'm already using a physics engine (box2d) but i have no idea about how should I implement circuit's path with wall collision. I tought about checkpoints but this doesn't solve the wall collision.
1
vote
0answers
103 views

LibGdx Triangle Collision

I'm back with another question. I'm trying to get a collision between an actor and a sprite. With the actor, which only moves upwards and downwards, I've got no problem since it's shape is a ...
1
vote
0answers
51 views

How to Calculate K-Dops Faster

Ok so I have my general understanding of K-Dops for collision detection. I understand how to calculate them. I also understand the super slow way of recalculating them. Example: I have a simple ...
1
vote
0answers
43 views

Bullet Physics ConvexDecomposition?

I've looked at Bullet Physics ConvexComposition Demo and would like to implement that in my game but the code is so undescriptive and it's hard to understand what is going on. Would any of you people ...
1
vote
0answers
115 views

Collision detection 3d rectangles using SAT

This question builds on a previous post asked by griffinHeart nov 2012. See link below. How many and which axes to use for 3D OBB collision with SAT Refering to the explanation/answer by Ken. What ...
1
vote
0answers
54 views

Setting up 3d Collision for Primitive shapes

Im having some trouble understanding how to set up collision detection between my first person camera and my primitive shapes which are made using the vertex buffer. Do i give my camera a boundingBox ...
1
vote
0answers
66 views

java slick2d - gettileproperty returns true when it shouldn't

I'm trying to implement some collision detection to a test game i've been making. I've used TiledMap to create the map and set a property on one of the tiles to blocked=true This tile is then drawn on ...
1
vote
0answers
69 views

Storing rigid body collision shapes in local or world coordinates

I'm writing the beginnings of a lightweight 2d rigid body engine (in javascript, as a hobby project), and i'm debating whether to store collision shapes in local or in (updated as needed) world ...
1
vote
0answers
101 views

Speeding up point-in-polygon for Python

In researching collision detection methods for non-Rect-like objects I came across point-in-polygon -- specifically, the even-odd rule. The one presently on Wikipedia claims it is written in Python, ...
1
vote
0answers
267 views

How to identify whether the boundingvolume intersects with walls or floor when it doesnt return normals?

My game in jMonkey is the kind that use will have to place objects in a scene (which consist of walls and slabs and floor). All my models are centered at origin. When the user click a point I use ray ...
1
vote
0answers
215 views

beginContact triggered more than once on some objects

Short version: It looks like beginContact is detecting continuous collisions. I'd like to avoid that. Long version : I use Box2Dweb to write a 2D platformer. It's my first game using this lib, and, ...
1
vote
0answers
144 views

Aiming with a crosshair with a lot of polygons/triangles

I'm working on a 3d kindof game where I'll eventually be able to modify the shapes present in the environment by pulling their faces with a crosshair. The thing is that I don't know how to achieve ...
1
vote
0answers
153 views

scale rotating boundingbox

I want to use basic rectangular collision detection. I have a rotating sprite and a method that calculates the bounding box every time in the Update() method. I simply check for intersection between ...
1
vote
0answers
215 views

How can I implement collision for a “pseudo-3D” game?

I'm looking for high level implementation details, not specifics. I've worked with bounding boxes before in some 2D games, but I'm currently tackling a "2D + depth" (2.5D?) style game along the lines ...
1
vote
0answers
202 views

Sketchy results from ray-plane intersection code

I've set up a demo with simple first-person controls using C++ and OpenGL, and it seems to work reasonably well. My goal is this: when the player looks at a plane and clicks the left mouse button, ...
1
vote
0answers
304 views

iOS cocos2d - sprite gets stuck in collision detection

I'm developing a top down game in cocos2d and I have collision code that checks collisions between enemies and the player so that they don't go through each other. The code seems to work but the ...
1
vote
0answers
1k views

Why do restitution values less than one still cause infinite bouncing in Box2D?

I'm currently trying to implement basketball bouncing into my game using Box2d (jBox2d technically), but I'm a bit confused about restitution. While trying to create the ball in the testbed first, ...
1
vote
0answers
200 views

Detect Sprites, they are in Shape or Not which random draw in Cocos2d

I have searched a lot on web and found some of help ful links as exact my question. Link 1 Link 2 But still i am not success to achieve this, i have done some of code lines, as like draw line by ...
1
vote
0answers
50 views

Getting collisions with equal values in Sweep and Prune

When sorting an (incremental and persistent) SAP, you generally move extremas left until you run into a smaller/equal extrema, gathering collisions along the way. However, that results in the ...
1
vote
0answers
774 views

Unity3D: collider performances on mobile iOS devices

I'm experimenting with Unity3D and colliders. Unfortunately I still don't have Unity Pro version and I can't use the profiler. Consider the following situation: mobile devices (ios, iphone 3GS). an ...
1
vote
0answers
197 views

Updating physics for animated models

For a new game we have do set up a scene with a minimum of 30 bone animated models.(shooter) The problem is that the update process for the animated models takes too long. Thats what I do: Each ...
1
vote
0answers
80 views

What is the most effective way to create a set of collision points for an aribitrary mesh?

In my project I am working on automatically deforming an arbitrary mesh with respect to another arbitrary mesh, within the context of user generated content, similar to this deformer being developed ...
1
vote
0answers
225 views

Debugging Minimum Translation Vector

I implemented the minimum translation vector from codezealot's tutorial on SAT (Separating Axis Theorem) but I'm having an issue I can't quite figure out. Here's the example I have: As you can see ...
1
vote
0answers
165 views

Farseer Physics EndContact events don't fire for all registered delegates

Here's my situation: I have several objects that contain a body and a fixture. They are set to sensor = true; atmosphere = BodyFactory.CreateCircle(world, atmosphereRadius / Level.METER_IN_PIXELS, ...
1
vote
0answers
426 views

3d collision detection on non flat surface

i am developing a game which needs an accurate collision detection algorithm, when a object travels down a slope which isn't flat. To be more precise i need to simulate a skier who travels down a ...
0
votes
0answers
3 views

Get own child that collided with another object in a compound object in unity3d?

I have a compound object (a parent with a rigid body listening to children events fired by their colliders like OnTrigerXXXX). When using this type of configuration there's a problem when we want to ...
0
votes
0answers
12 views

iOS Sprite Kit - Distort Body Upon Collision

I am trying to create a surface that will distort upon collision of another object. Imagine a rubber partition that bends outward when shot with a projectile, and then retracts back to it's original ...
0
votes
0answers
41 views

Dynamically destroy objects when player enters a boxcollider2D

What would be the best approach for destroying dynamically objects when player enters a boxcollider2D? Currently using parent objects with boxcollider2d to activate OnTriggerEnter2D, boxcollider2d is ...
0
votes
0answers
22 views

Bullet Physics for Collision Detection and Smooth Response

I'm creating a game using LibGDX, and to prevent the need to spend lots of time writing collision detection code I've decided to make use of Bullet Physics, simply for collision detection and not for ...
0
votes
0answers
47 views

2D Distance Field as collision handler method

Pixeljunk Shooter has really cool fluid simulation. I found the dev's video explaining what they did. Here I understand that it is particle based simulation Smoothed Particle Hydrodynamic I can ...
0
votes
0answers
50 views

Load character instead of load level

I have some trouble finding out how I can load my character at the start of the level, instead of resetting the whole thing. The game mechanics are quite straight forward; don't touch the walls. If ...
0
votes
0answers
33 views

How do I apply Farseer Physics Engine Collision on my image? I tried it on my codes and it is not working

How do I apply Farseer Physics Engine Collision on my image? I tried it on my codes and it is not working. PoolGameSingle poolgame = new PoolGameSingle(); var cue = poolgame.CueStick; ...
0
votes
0answers
56 views

Separating Axis Theorem contactNormal

I implemented the separating axes theorem as described in "Real time collision detection" by Ericson for my OBB vs OBB collision. Got that working. To continue with my collision response I need more ...
0
votes
0answers
60 views

Collision detection in 3d

what is the simplest algorithm for collision detection that respects the following requirements: The collision is only between cubes that are always aligned with the axis of the world (not rotated). ...
0
votes
0answers
58 views

Very strange trigger behavior in Unity2D (4.5)

I am developing 2d platformer and I've faced with a very strange triggers behaviour in Unity. I have made the enemy that can throw objects into main player. So I have made two empty GameObjects with ...
0
votes
0answers
30 views

Locate point of collision for two moving lines

I am trying to implement a continuous collision detection system that checks collision between two polygons for a certain time step, concave or convex. It makes the simplification that the path ...
0
votes
0answers
32 views

How to determine positions to draw lines on a screen with AndEngine

I have a screen (480x800), M(mx, my) is a static point, and N(nx,ny) is a dynamic point on screen. Position of N(nx, ny) depends position of touch. I want to determine position of P(?,?) and Q(?,?) to ...
0
votes
0answers
59 views

Sporadic collision detection between prefab and target?

I'm trying to get a enemy prefab to track a static target. The "enemy" is spawned into the playing area and using A* Pathfinding, tracks down the target by name. The prefab is destroyed upon collision ...
0
votes
0answers
50 views

Image layer into tile map concept

I'm not really familiar with programming but I wanted to ask if someone could give me some tips. I would like my game maps could be easily designed in some kind of graphics editor. I came with an idea ...
0
votes
0answers
35 views

Calculating co-ordinates of a line/ray that's increasing in height with a known slope/radians. Height increase is also known

basically in my game I'm firing a line. The line's anchor point is at the very bottom of it, and half of its width. When I fire the line, its rotation gets set to face where we want it to go. Then, ...
0
votes
0answers
60 views

How to put a rectangle around an ImageView in Android

I'm trying to make a rectangle have the same x, y, height and width values as an ImageView for collision detection purposes. Is there a way to do this?