Relating to the motion of objects through space (in 2 dimensions (x,y)) and time. Including concepts such as acceleration (thrust and gravity), mass, collision response, friction and more.
3
votes
3answers
1k views
Implementing Separating Axis Theorem (SAT) and Minimum Translation Vector (MTV)
I was following codezealot's tutorial on SAT and MTV and trying to implement it myself but I've come a cropper when it comes to getting the correct MTV. Here is my example: (Cue pretty pictures...)
...
3
votes
3answers
639 views
2D Ragdoll - should it collide with itself?
I'm working on a ragdoll fighting game as a hobby project, but I have one dilemma. I am not sure if my ragdoll should collide with itself or not, i.e. if ragdoll's body parts should collide.
2D ...
3
votes
2answers
265 views
Good ways to edit arbitrary collision shapes for 2D physics engine?
Assume you have several 1024x1024 textures which contain an arbitrarily shaped and relatively complex cave system whose walls need to have collision polygons defined. The polygons need to be convex to ...
3
votes
3answers
369 views
Moving a body in a specific direction using XNA with Farseer Physics
I have a custom polygon attached to a body, which looks like this:
What I am trying to accomplish is getting the body to move according to wherever the tip of the body is. So far this is what I've ...
3
votes
1answer
289 views
2D Motocross physics
I'm looking into making a 2D motocross bike game with plausible physics.
It should look like this:
For a first try, I've created only the player (a motocross driver) and the map (consisting of ...
3
votes
1answer
340 views
Moving object through nodes in Quadtree
I'm working on my own quadtree for use in games for physics (collision detection to be exact) but am unable to move an object from one node to another node.
What I'm doing is if some object is to be ...
3
votes
1answer
559 views
How can I convert a 2D bitmap (Used for terrain) to a 2D polygon mesh for collision?
So I'm making an artillery type game, sort of similar to Worms with all the usual stuff like destructible terrain etc... and while I could use per-pixel collision that doesn't give me collision ...
3
votes
2answers
434 views
How can I implement revolute (hinge) joints in a 2d physics system?
Further to my previous question on fixed joints, I am now going toe-to-toe with hinge joints in 2D physics. Though the answer to the previous question was excellent, I have come across a few problems ...
2
votes
4answers
532 views
How to Make Objects Fall Faster in a Physics Simulation
I used the collision physics (i.e. Box2d, Physics Body Editor) and implemented onto the java code. I'm trying to make the fall speed higher according to the examples:
It falls slower if light object ...
2
votes
1answer
258 views
Simple 2D hair simulation/manipulation
I would like to simulate very simple hair in a 2D environment, and will need to be able to "brush" the hair.
What I want to do: A 2D character is facing squarely towards the player. The player can ...
2
votes
1answer
407 views
Friction in 2D game
I'm developing a 2D platformer, although this question could probably apply to just about any 2D type physics; What is the equation for friction? I have sort of a hacky type of friction set up in my ...
2
votes
2answers
2k views
Arc'd jumping method?
Okay, so I'm making a platformer, and I wanna know how I can make a arc'd jump easily. Like what Mario does in super Mario Bros 1. Any ideas on a simple way to accomplish this?
2
votes
2answers
894 views
2D physics engine for WP7?
I'm looking for a 2D physics engine for Windows Phone 7.
Is there a port of something existing for use?
2
votes
2answers
619 views
Physic of an arrow in flight
What are the formulas which represent the horizontal and vertical displacement of an arrow in flight (as well as it angle)? I would like to make sure that I take into consideration the arrow's fluid ...
2
votes
2answers
217 views
I'm trying to learn the “digital physics” required to do a floating network of spheres
If that is even what it is called. What I am trying to do it:
http://asterisq.com/products/constellation/roamer/demo
Can someone please point me to towards a book or in vaguely the right direction? ...
2
votes
5answers
7k views
which is the best physics engine for flash as3?
i am a game programmer and i use actionscript to do all my collision checking, boundary checking etc...but recently i noticed there are things called "physics engines" that help me concentrate more on ...
2
votes
2answers
210 views
Procedural generation of physics-enabled structures (in a 2D world)
Is it possible to procedurally generate stable structures out of rigidbody objects at a reasonable runtime speed? Imagine Angry Birds's levels kind of structures but generated procedurally.
2
votes
3answers
1k views
Car movement in arcade racing game
I am finishing a very basic 2D racing game with top-down perspective. I can't get the appropriate formulas to make the movement of the cars fun and addictive... Do you have tips on how to achieve that ...
2
votes
4answers
832 views
Good way to implement really basic physics in Flash?
I'm making a somewhat simple side-scroller in Flash. The way I'm currently doing the really basic physics(you don't fall through floors/can't walk through walls) is that I have a big symbol of all the ...
2
votes
2answers
437 views
Physics in carrom like game using cocos2d + Box2D
I am working on carrom like game using cocos2d + Box2D. I set world gravity(0,0), want gravity in z-axis. I set following values for coin and striker body:
Coin body (circle with radius - ...
2
votes
2answers
450 views
Tracking Object Position - Firing on a Trajectory
How can I calculate the position of an object after "firing" it from a fixed point?
I am to create a small game - most likely with canvas (pure HTML, JS based) or Adobe Flash - in which the player ...
2
votes
1answer
99 views
Physics movement prediction is way off [closed]
I'm making a simple, non-networked game. There are two players and a ball. In implementing the AI for the second player, I've run into a huge problem predicting where the ball will hit the ground. ...
2
votes
2answers
217 views
Writing an autopilot for a 2d game with newtonian physics
The subject says it all. I am making a 2d space game with newtonian physics and I need pointers on how to write an autopilot for it. The requirements are best explained by an example.
There is a ...
2
votes
3answers
1k views
Game physics / 2D Collision detection AS3
I know there are some methods you can use like hittestPoint and so on, but I want to see where my movieclip colliedes with another another movieclip. Any other methods I can use?
by any chance does ...
2
votes
2answers
295 views
One-way platform collision
I hate asking questions that are specific to my own code like this, but I've run into a pesky roadblock and could use some help getting around it. I'm coding floating platforms into my game that will ...
2
votes
1answer
545 views
Collision Detection for a 2D RPG
First of all, I have done some research on this topic before asking, and I'm asking this question as a mean to get some opinions on this topic, so I don't make a decision only on my own, but taking ...
2
votes
3answers
1k views
How do I change my gravity and jumping logic to put the character at a specific height at a specific point in time?
I'm making a 2D platformer on Android using libGDX. One thing I've had a problem with recently is gravity and jumping. I found a few tutorials on the internet and was able to come up with this...
...
2
votes
1answer
316 views
How can I make a car follow the terrain in a 2D (side-view) game?
I'd like to create a game where a car drives over a 2D terrain.
Which algorithm to use so the car will follow the mountain incline?
2
votes
1answer
841 views
How to resolve concurrent ramp collisions in 2d platformer?
A bit about the physics engine: Bodies are all rectangles. Bodies are sorted at the beginning of every update loop based on the body-in-motion's horizontal and vertical velocity (to avoid sticky ...
2
votes
3answers
879 views
How do I move a 2D top-down racing camera smoothly and show what's ahead of the player?
I'm trying to make a camera that follows a race car. Right now, I'm smoothing the camera movement out by moving the camera's position a fixed percentage lerp'ed from the camera's position to the car's ...
2
votes
2answers
841 views
Find meeting point of 2 objects in 2D, knowing (constant) speed and slope
I have a gun which fires a projectile that has to hit an enemy. The problem is that the gun has to be automatic, i.e. - choose the angle in which it has to shoot, so that the projectile hits the enemy ...
2
votes
2answers
1k views
Using box2d DrawDebugData with multi layer scene?
In my Game, a Scene is composed by several layers. Each layer has different camera transformations.
This way I can have a layer at z=3 (GUI), z=2 (Monsters), z=1 (scrolling background), and this 3 ...
2
votes
1answer
166 views
RK4 integration and Continuous Collision Detection
I'm using this method to detect collision between two AABBs. The algorithm is simple, fast and works great. It uses the relative velocity between the two objects to calculate TOI. This works fine with ...
2
votes
1answer
280 views
android game-logic for shooter
Im creating a 2d game for android.
I'll just get right to it. I have a sprite controlled by a joystick that needs to shoot, sofar Ive managed to get direction and movement on my bullet, but then I ...
2
votes
2answers
697 views
Canvas Rotation collision detection on a sprite
I am using this code to detect collisions between two rectangular sprites.
intersect: function(other) {
return this.x < other.x + other.width && other.x < this.x + this.width ...
2
votes
1answer
181 views
Realistic 2D Planetary Physics Engine?
I'm doing a spaceflight simulator in C++ (using Allegro 5), and I realised that I could just use a physics engine instead of writing my own physics.
So that's what I'm doing.
Since this is going to ...
2
votes
1answer
247 views
What's the best way to handle slopes for a platfomer game using Box2D
I would like to know if there is any known solution for handling the player's movement on slopes using Box2D engine.
I tried to do it using a circle as the player. Everything was fine until I tried ...
2
votes
5answers
684 views
How do I set up moving platforms in a 2D side scroller to interact with the player properly?
Edit: I changed the way that gravity was applied so that it is applied even when a player is standing on a block, so instead of the game outputting that you are stepping on a tile as true and false ...
2
votes
2answers
362 views
Physics in a 2D oblique perspective game
So, just to clarify, because I'm still fuzzy on the terms for perspectives in older games myself, examples of an oblique perspective can be seen in many older RPGs (Earthbound, Final Fantasy, Secret ...
2
votes
1answer
428 views
Need help with collision detection/resolution in a 2D simulation of 'worm-like' creatures
(originally posted this on regular stack overflow, somebody pointed this forum out :-) )
Hi there,
I'm implementing a physics engine for the simulation of worm-like creatures. Problem is, is that ...
2
votes
1answer
659 views
Converting 2D Physics to 3D
I'm new to game physics and I am trying to adapt a simple 2D ball simulation for a 3D simulation with the Java3D library. I have this problem:
Two things:
1) I noted down the values generated by the ...
2
votes
3answers
1k views
2d Collision detecton axis aligned boxes
I have recently run into some trouble with my collision detection. My game is composed of a map made out of axis aligned squares. The player has an x and y velocity, and I want to know how I can find ...
2
votes
0answers
228 views
Nape physics - Moving a body
Hey I'm currently getting started with physics engines and I set up a body (box shaped) which represents my character.
Question: Which methods can I use to move a Nape.Body aka my char?
I tried so ...
2
votes
1answer
603 views
How to implement Ragdoll physics to 2D characters in XNA?
I'm starting a new project with XNA. I want to create a game where the main character is subject to ragdoll physics when killed. I was wondering if anyone can give me any tips on how should I ...
2
votes
0answers
212 views
how to attach a body to a rope and making it swing to another rope
I've set some ropes (using cocos2d and box2d) and would like to attach a body to one rope in such a way that it can swing to another rope. I am not sure how to go about this. I read making and object ...
2
votes
1answer
1k views
Farseer Physics collision detection vs intersection detection with sensors
I'm trying to make a game that uses Farseer physics engine as its main collision detection engine. I have a 2d circle body object that has a matching fixture (I used the CreatCircle method. I did not ...
1
vote
1answer
260 views
Determining relative velocities on impact?
I'm trying to figure out a way to determine the relative velocity of a body colliding with another in a 2D environment.
For example if one body is moving at (1,0) and another traveling behind it ...
1
vote
1answer
196 views
In 2d game logic, should I use pixels or world coordinates?
Currently in my game I handle the logic (collisions, movement) using pixels but I find it very limiting espiecially when thinking about variable speed.
For example Box2D requires you to use ...
1
vote
2answers
1k views
Box2D Platform body not moving player body along with it
I am creating a game using Box2D (Javascript implementation) - and I added the ability to have a static platform, that is moved along an axis as a function of a sine.
My problem is when the player ...
1
vote
1answer
1k views
ways to make a physics engine
Hey so i've been looking into real time physics engines, which led me to the crazyLaggoa multiphysics engine by thiaga costa, and brought up the question of:
What are some possible ways, ideas that ...
