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 determine whether a given line intercepts another

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 ...
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1answer
37 views

Clip shadow frustum to scene bounds

I have a global light in my scene. It casts shadows using shadow mapping and has an associated camera (for rendering to the shadow map). I'm going to refer to it as my "shadow camera" from now on. I ...
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1answer
89 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 ...
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2answers
63 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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13 views

Tile map collision C++, SFML

My problem with the collision here is more to do with how to decide which tile the player is in. Each quad of the map is 16 pixels squared (Vertex array), and the player moves in 1 pixel jumps. ...
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1answer
32 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
611 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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0answers
55 views

How do I check for collision between transparent textures?

I am creating a 2D game using OpenGL. For sprites, I use textured quads (actually two triangles). The texures contain transparent pixels, since objects are not always perfectly rectangular. How do I ...
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2answers
48 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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0answers
21 views

platformer side movement collision problem [duplicate]

I making a game in javascript and I'm stuck, the player will stop moving if he hits the left side and if I move left a little bit and try to move right again I cannot. My question is: Whats wrong ...
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2answers
442 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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4answers
15k views

Ignore collisions with some objects in certain contexts

I'm making a racing game with cars in Unity. The car has a boost/nitro powerup. While boosting, I wouldn't want to be deviated when colliding with zombies, but I do want to be deviated when colliding ...
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How To Detect Collision With Coins [closed]

I want to know how to give the player plus 1 point every time the player collides with that a certain object. Every time the object is collided with, it will at on to the previous amount. Example: if ...
3
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1answer
192 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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1answer
138 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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0answers
33 views

Efficient Collision detection for polygons (fleet) in an RTS

I'm trying to make an RTS for android using libgdx. I would like to have collision detection to be able to detect ships inside the range of weapons and collision between my bullets and the ships. So ...
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2answers
279 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
23 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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2answers
100 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
75 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 ...
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0answers
19 views

Implementing Separating Axis Theorem to Detect and Handle Sliding Collisions

I am having a bit of difficulty detecting collisions properly with separating axis theorem. My code seems to be giving a lot of false alarms. Also, I've looked into implementing sliding collisions ...
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2answers
29 views

Detect collision that happen between frames, between slices of moving, rotating circles?

To detect a collision between two circles, we check if the distance between their centers is smaller than the sum of their radii. To detect a collision between a slice (in this case half) of a circle ...
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1answer
45 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 ...
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2answers
44 views

Efficient Collisions Iteration?

My project has upwards of 3000 2D objects but not all of them collide with each other. Between each object that can collide, a CollisionPair is created and stored inside a flattened array. Currently, ...
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1answer
175 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
58 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
163 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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2answers
611 views

Wall detection in maze game - On the fly or precomputed?

I've been a programmer for over a decade, professionally for the last five years, but I've never really done any games programming. I've had a look at some tutorials but most of what I've found is ...
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2answers
444 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
66 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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0answers
16 views

Libgdx polygon ratating

I'm using polygons for collision detection. Here is the code: poly = new Polygon(verticies); poly.setOrigin(100,100); poly.setRotation(45); renderer.setColor(Color.GREEN); ...
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1answer
443 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 ...
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1answer
40 views

Collision detection console log errors?

So the code down below is supposed to load the next scene once the player touches the flag which the code is attached to. I've made sure that is trigger is checked and yet I'm still getting errors ...
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1answer
38 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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1answer
40 views

How do I have different colliders against different objects? Unity

Say for example I have a ball, I want the sphere collider to be a certain radius when it comes into contact with one material (material A in diagram) and a different size when it comes into contact ...
0
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1answer
83 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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1answer
53 views

Voxel terrain collision detection with AABBs

I'm working on implementing collision detection on voxel terrain (Like Minecraft) with AABBS. Right now, I have it so I can tell if a point is within a voxel or not, I do this by having a 2D byte ...
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1answer
15 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
791 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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2answers
397 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 ...
3
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1answer
87 views

Is it really necessary to test collisions against triangle vertices and edges?

I'm reading this paper, and using it to perfect the narrow phase collision system for my game engine. To make the question as self-contained as possible, the essential strategy used to detect ...
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1answer
84 views

How to optimize my movement & collision code?

I am trying to implement movement & collision the simplest way possible. public void MovePlayer() { KeyboardState keyState = Keyboard.GetState(); Vector2 checkVec = ...
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vote
1answer
38 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
votes
1answer
61 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 ...
0
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1answer
364 views

LibGDX Bounding Rectangles

I'm creating some rectangles surrounding my sprites for my player and bullet class to detect collisions with the overlaps method in Intersector class of LibGDX. I have a question: When I instantiate ...
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vote
1answer
131 views

How do I make circles bounce off each other realistically?

I'm trying to create bouncing balls with realistic physics. At the moment, when the balls hit each other, they bounce back in the same direction they came from. How do I make them more realistic? I ...
0
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1answer
61 views

LibGDX obstacle collision

How can I handle collisions with obstacles in LibGDX? Is there any automatic way to stop the character's movement when it collides with a wall or I have to constantly poll for all the possible ...
0
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1answer
89 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: ...
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1answer
399 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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2answers
819 views

Collision detection optimization for a top down shooter

I'm relatively new to game development and have been trying to learn how collision detection is coded. I mostly work with Actionscript 3, but I'm learning C++ on the side. I've been wondering how ...