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Game Development

Questions tagged [collision-detection]

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

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1answer
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Unity 3D move kinematic rigidbody

I'm trying to move a kinematic rigidbody (a spaceship) with this code: ...
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1answer
42 views

3D line segment AABB collision, with hit normal?

I'm embarrassed I can't find this, but I'm wanting to detect intersection with a 3D line segment (not an infinite ray) with a 3D AABB, the AABB being defined as two Vec3f's which represent the Min and ...
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1answer
38 views

Detect collision on explosion

I am creating spells for my game. The collision with a normal fireball works just fine, what I am trying to achieve is to have the player_2 getting hit when the ...
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0answers
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Numerical errors in Player collision offset causing player to fall through the ground the next frame, how to avoid?

I'm trying to implement player physics with arbitrary objects, in this case, a bunch of cubes. I wanted to add a "floor" so in my cube collision function, I added the following following lines: <...
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2answers
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How do I detect collisions between a point and a sloped line?

The character in my game constantly falls due to gravity, so i have to detect the collision between the bottom point of the character and the tile slope line on the same x coordinate. The character ...
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1answer
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How to check for sprite collision without Unity's rigidbody?

I'm currently making a recreation of Missile Command, but the problem is that I'm not allowed to make use of Rigidbody functionalities in my specifications. While player missile explosion spawning is ...
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1answer
23 views

How to make wheelcollider not stutter when moving on high speed?

I have a wheelcollider attached on a rigidbody and i move the object using : "transform.position += transform.forward * speed * input.getkey(keycode.uparrow)" And when the speed increasing the ...
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3answers
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Both Trigger and Collision BoxCollider2D

My Player sprite needs to collide with some objects and be unable to pass through them and in other cases detect when it passes through some object (e.g. some non-...
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2answers
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Get Closest point between a Box 3D and a Point

I have a point A (x, y, z), and a Box: Center (x, y, z), Size (Width, Height) How to get the closest point in the box from the point A ? In Unity I can create a bound, and I can find the non-rotated ...
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1answer
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Space game scene boundaries

I've been trying to add boundaries to my space game. I've been following this tutorial with a sphere instead of a cube, but every time I start the game and move or rotate my ship it appears outside ...
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1answer
102 views

Quadtree for AABB collision boxes

I have a whole bunch of entities constantly being processed and testing for collisions. I've tried to optimize this by stopping certain entity types from checking each other, dead entities not being ...
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1answer
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3D Collisions - Walking below a slope pushes me through the floor

Here's a really short video (less than 30s) of this issue : https://www.youtube.com/watch?v=JrKbpTY8cMU When I move the player towards a slope (the player is below it), it pushes the player inside ...
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1answer
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Box2D Weird collision behavior

I'll let the gif speak first. As you can see, the small cube just kinda floats there like it has a forcefield. This weird glitch only happens with small cubes, smaller than 60 pixels for some reason. ...
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2answers
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How to handle objects at the edges of spatial partition cells?

A lot of games store object positions as floats and have a closed ball for the game area (eg. a rectangle and objects are allowed to have position coordinates on all 4 edges). However, this becomes ...
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1answer
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why child class can access object while parent can't

I have Block class which is the parent and StandardBlock the child , the prefab block have StandardBlock script attached to it, and according to my small knowledge in inheriting I though this would ...
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2answers
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How To Resolve Collision Before it Occurs

I have 2 objects, A and B, in a 2 dimensional space. If I know A is trying to move by vector M (that is to add vector M to the positional vector of A), and that A will collide with B after A moves, ...
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1answer
65 views

Using logic gates for Sprite Collision Detection - humor an old fart please

Im an old coder who came back so to speak, learning Java I know what I want but I cannot find anyone asking it anywhere so here goes... Im writing a basic tank game to code for practice but as is ...
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1answer
22 views

The collision log is displayed only for the original obstacle and not for the duplicates

This is my first game attempt and I'm trying to create a game where my player (a box) stops whenever it collides with an obstacle. However, the log for the collision is only displayed when the player ...
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1answer
32 views

Collision Detection For A Maze/Cave

I have a simple code written in Processing 3.x that I am using to test out the collision detection for a cave/maze. The code is here: https://github.com/NoahJon3s/New-Journey-The-Game/blob/master/...
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Somebody tell me, how can i do normal collision in pico?

Some month ago I found information about pico8 and began do something. But now i have problem. I want to create square with move on the flat, but i don't understand, how to make the collision?
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Moving point (as line)-Polygon collision detection

i've reached a good point with my engine, with static/instant collision detection and callbacks in case of collision. By instant collision detection i mean: Object A moves from x1y1 to x2y2 Check if ...
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0answers
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brick breaker game - object collision problem - ball get's stuck in corners

I'm working on a game of brick breaker and I've encountered a problem that I can't figure out. whenever the ball collides with the corners of the peddle it starts vibrating (it's Yspeed vector changes ...
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0answers
17 views

Stop the player to prevent it from being thrown away after collision

I'm trying to write a script where when the player (kinematic) comes up against an enemy he stops, jumps and gets dynamic again. The problem is that when it returns dynamic it is thrown away and does ...
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0answers
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What is wrong with my collision detection?

I am trying to create a collision detection system between block using this code: ...
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1answer
105 views

What to do with collision detection?

I am able to get collision detection (CD) into my game but... what do I do with it? Do I push the player back to the last location? Something else? I am programming the game in C++ using the Irrlicht ...
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2answers
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Dragging a Rigidbody2D without passing through obstacles

I have this body of code written for an object that needs to be an obstacle and another object that is draggable. I have colliders on both and a kinematic rigidbody on the draggable object, but the ...
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0answers
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Keep my 3d player from jumping if he's not on the Ground [duplicate]

I'm making a 3d game, and I have only made games in 2D before, but i have used blender before too. My player can now walk and jump, but he is not limited to only jumping of the ground. In 2D, you ...
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1answer
26 views

How to construct this collision vector?

I have a 3d game, but for movement I use only two axes (X and Z) - X is vertical, Z is horizontal Here's what I'm trying to achieve: Player is the circle, InputDirection is Blue, NewInputDirection ...
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1answer
31 views

Character blocking when walking on cube edges

I have my character walking on a ground made of cube. (scale 1,1,1). There is no space between them. Also, I have a RigidBody with 15 drag and I'm moving with <...
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1answer
51 views

Collision detection and solution causes teleportation on corners

I am making my own game engine on Python and I got stuck with collision between objects. ...
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1answer
41 views

OverlapBox() dimensions are huge but are fine when tested in isolation

To be completely transparent, I more-or-less copied this question from the Unity forums since I did not get a reply. I'm creating this system where I'm placing level chunks together and I need to ...
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1answer
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Top-down 2D push angle velocity

I'm trying to determine the angle NPCs are pushed in when the PLAYER collides with them, like how 'Retro City Rampage' and 'Shakedown Hawaii' do when you bump in pedestrians. Here the PLAYER (green) ...
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chunk based collision

I have been trying to figure out why my collision tiles act so strange; I put I collision tile above a normal chunk based tile but it seems to not work - the collision tiles seem to appear in the ...
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2answers
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AABB Collision Detection Confusion

I am trying to understand and implement AABB collision to learn simple 2D game physics. I'm following a tutorial and its method is a bit different to other websites. It uses the center of the object ...
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1answer
234 views

Making a wrapping wire (like the Worms Ninja Rope) work correctly with moving geometry

I have implemented a 2D wire like the one described in this question which is made up of straight line segments between wrapping points. However, while the algorithms described in this answer work ...
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0answers
26 views

Pygame Mask Doesen't Detect Collisions

I'm trying to make my game's collisions with masks. I have 6 masks but only 2 works. My code is: ...
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2answers
77 views

OnTriggerEnter With First Person Controller

I'm working on an FPS for my first time. I'm creating a simple terrain and instatiating 15 cubes on my terrain. (This works fine). Each cube is named "cube" and has a static trigger collider. Here's ...
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Collision2D on sprite child (sword of char) does not detect collision on tag == enemy

Problem is in the title. The sword sprite is a child of body which is a child of my char. Sword and Char have collider and rigidbody, and if the char and enemy collide, it works. But it does not ...
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1answer
31 views

How to prevent/“reverse” displacement from a collision?

In my game I can throw a hammer. The hammer moves based on physics in Unity. The hammer destroys the first object it touches. I want it to continue moving as though it didn't touch anything when this ...
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1answer
40 views

Why do my objects with colliders go through each other, and how do I fix it?

I am new to Unity and I am just experimenting with a player controller script (which I got off youtube) and another object which doesn't move. Both my player and the stand-alone object have colliders ...
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0answers
45 views

Box2D with SDL2 not working properly (Collision without rotation and problems with MKS)

I already have some expirience using SDL2 so I thought I will add a Physic Engine to my game - I chose Box2D. I managed to setup everything and to build a small program using SDL2 and Box2D. But now ...
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Odd Behavior with Simple Collision Detection Between Moving Objects, Rectangle Method

Solution Update After tinkering around a bit, I noticed that my bounding boxes were not updating in accordance with the movement of their respective objects, so it struck me that I should put the ...
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1answer
26 views

Unity Collider2D is causing the game object to disappear upon collision

I have gone through just about everything to try and isolate this bug. I have isolated it down to the enemy collider, but have not solved the issue. When my player collides with my enemy, the enemy ...
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0answers
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Unexpected collision between two gameobjects [duplicate]

I can't find out why my Cube gameobject sometimes collides on transition right between two gameobjects (blocks), which are the same height, material and so on. See the gif below (note, the colors are ...
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0answers
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Where and how should I check for collision in multiplayer game?

I'm making a multiplayer game. For now, I added a script to towers and I have booleans to change using OnTriggerEnter. When triggered, client sends a message to server and towers health starts to get ...
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0answers
31 views

Unity3d:Detect a collision between an image and a sphere

So, I just realized, an image with BoxCollider2D wont detect any collision with Sphere with <...
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1answer
29 views

How to make character not enter the platform when colliding on the side with the platform?

I had a problem with detecting my character's collision with the enemy being detected in 2 ways: side by side when it (character) jumps into the enemy's head. I imagine it to be basic, so I figured ...
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0answers
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Problem with collisions detection on canvas platformer

Having a lot of trouble with my collision detection in my platformer. If you go straight to the right the block will float. Also the corners let the block sink right through and the walls are sticky. ...
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1answer
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Is there a name for this algorithm for 2d shape collision?

A while ago I was considering my possibilities for implementing collisions between 2D shapes, and after much googling (which mostly turned up SAT), I came up with this: ...
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1answer
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Creating a victory zone / Count units inside zone

So I am attempting to create a zone implementation where if the amount of units with a certain tag exceeds the number of units with another tag an objective will be captured standing in the zone will ...

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