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
1answer
282 views
2D Smooth Turning in a Tile-Based Game
I am working on a 2D top-view grid-based game. A ball that rolls on the grid made up of different tiles. The tiles interact with the ball in a variety of ways.
I am having difficulty cleanly ...
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
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.
1
vote
1answer
104 views
What is going on in this SAT/vector projection code?
I'm looking at the example XNA SAT collision code presented here:
http://www.xnadevelopment.com/tutorials/rotatedrectanglecollisions/rotatedrectanglecollisions.shtml
See the following code:
private ...
1
vote
3answers
162 views
Implementing distance joint
I would like to implement something that behaves much like a distance joint / revolute joint in Box2D, however I do not want to throw a whole physics engine at this problem. I'm curious where I might ...
4
votes
4answers
475 views
Point of contact of 2 OBBs?
I'm working on the physics for my GTA2-like game so I can learn more about game physics.
The collision detection and resolution are working great.
I'm now just unsure how to compute the point of ...
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 ...
0
votes
1answer
155 views
Game Physics: Implementing Normal Reaction from ground correctly
I am implementing a simple side scrolling platform game. I am using the following strategy while coding the physics:
Gravity constantly acts on the character.
When the character is touching the ...
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 ...
5
votes
3answers
309 views
'Spring' physics
I'm trying to put together a struct or a method of some sort that will allow me to check the relative position between two objects, and if they're too far apart, apply a force that will draw them ...
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 ...
0
votes
2answers
345 views
Circle physics and collision using vectors
This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want ...
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 ...
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 ...
6
votes
3answers
358 views
Smooth waypoint traversing
There are a dozen ways I could word this question, but to keep my thoughts in line, I'm phrasing it in line with my problem at hand.
So I'm creating a floating platform that I would like to be able ...
4
votes
2answers
207 views
Detecting a ledge in Box2D [duplicate]
Possible Duplicate:
Detect Open Space in Farseer
How do I detect ledges?
I'm making a 2D platformer with Box2D. The player needs to be able to grab onto a ledge and pull him/herself up.
...
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
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 ...
4
votes
1answer
261 views
2D Magnet-like repelling behavior
If somebody wanted to develop a system between two intersecting rectangles so that the rectangles would, in a gradual process, push eachother away from one another until no longer intersecting, with ...
1
vote
1answer
198 views
Ideas for 2d fire simulation [closed]
I want to simulate a fire in a flat and non flat* surface (fire spread modelling).
I've seen that cellular automata is one of the algorithms that can be used. Are there other algorithms that would be ...
1
vote
1answer
143 views
2D Physics Engine to Handle Shapes Composed of Multiple Densities XNA
The game I'm working on involves shapes that might be composed of multiple materials in a variety of ways. Let's just take for example a wooden rod with and sizable tip of iron or say a block composed ...
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 ...
1
vote
2answers
102 views
How to fetch only the sprites in the player's range of motion for collision testing? (2D, axis aligned sprites)
I am working on a 2D sprite game for educational purposes. (In case you want to know, it uses WebGl and Javascript) I've implemented movement using the Euler method (and delta time) to keep things ...
3
votes
1answer
377 views
Creating a frozen bubble clone [closed]
This photo illustrates the environment: http://i.imgur.com/V4wbp.png
I'll shoot the cannon, it'll bounce off the wall and it's SUPPOSED to stick to the bubble. It does at pretty much every other ...
5
votes
2answers
286 views
Multiple collisions within a single frame cycle?
So say you want to simulate several objects in two dimensions, just bouncing around in a finite space. Using AABB and sweep tests, it shouldn't be that complicated to calculate single collisions ...
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 ...
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 ...
1
vote
1answer
166 views
Stopping an object after applying an impulse or force?
I'm having a small issue where after applying an impulse or force it is impossible to actually get an object to stop, i.e. a velocity of zero.
This code is run every 1 / 60 of a second:
void ...
8
votes
1answer
574 views
What is the difference between an impulse and a force related to a physics engine?
What is the difference between an application of an impulse and an application of a force in relation to a physics engine?
1
vote
1answer
756 views
Vector movement in space type game (Mouse rotation)
I'm having an issue with my movement in my 'game' prototype. It's basically not working and admittedly my knowledge with vectors is lacking.
The issue I'm running into is that the ship won't move in ...
3
votes
1answer
269 views
How to bounce a 2d point particle off of a circular edge
In a prototype I'm building, a particle can spawn anywhere within a larger, confining circle. Important to note is that the particle will not spawn in the origin of the larger circle, but anywhere ...
3
votes
3answers
218 views
Physics System ignores collision in some rare cases
I've been developing a simple physics engine for my game. since the game physics is very simple I've decided to increase accuracy a little bit. Instead of formal integration methods like fourier or ...
1
vote
1answer
427 views
How make a laser path prediction line like a “slingshot cowboy” game?
How so I make a laser path prediction line like a “slingshot cowboy” game in cocos2d or box2d and select the target like "slingshot cowboy" game.
9
votes
3answers
340 views
How to simulate pressure with particles?
I'm trying to simulate pressure with a collection of spherical particles in a Unity game I'm building. A couple notes about the problem:
The goal is to fill a constantly changing 2d space/void with ...
7
votes
2answers
652 views
What is the best way to handle simultaneous collisions in a physics engine?
I'm writing a 2d physics engine in javascript so that I can learn more about physics in video games. I have it working correctly for rigid body collisions, except for if any body collides with two or ...
1
vote
2answers
213 views
How do I interpolate air drag with a variable time step?
So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically ...
1
vote
1answer
453 views
What is wrong with my Dot Product?
I am trying to make a pong game but I wanted to use dot products to do the collisions with the paddles, however whenever I make a dot product objects it never changes much from .9 this is my code to ...
0
votes
2answers
2k views
What fluid simulation system is used in iPhone games?
Does anybody know what kind of system developers are using for fluid simulation in iPhone games? It doesn't seem like they're using a Navier-Strokes simulation to me.
3
votes
3answers
1k views
How can I make my main character move in a parabolic arc when jumping?
I'm entering Android game development, and I already have a computer version of a game I want to publish. The thing is, I want to make this as good as it can be. With that said, I need a physics ...
1
vote
1answer
1k views
Setting a Box2D Bodies Center?
How do I set the center of a fixture/body consisting of multiple shapes (triangles)?
1
vote
2answers
249 views
Building a shape out of two rectangles
I would like to build a body with Farseer out of two rectangles so it looks like this:
I am a real beginner, so please describe it carefully.
Thanks in advance!
4
votes
2answers
323 views
Which techniques to study? [closed]
Just to give you some background info, I'm studying a programming major at a tertiary level and am in my third year, so I'm not a newbie off the street. However, I am still quite new to game ...
1
vote
2answers
649 views
How do I determine which side of the player has collided with an object?
I have some static bodies (platforms) and a dynamic body (the player) in my world. The collision between them works great, but I would like to know which side of the player (rectangle) collides with ...
0
votes
1answer
356 views
Specific Physics Lessons and Reference for Game Development
What "Physics stuffs" should I learn in game developments? I'm reading about Verlet Integration, and I'm wondering what other lesson should I learn and if there are available resources can you please ...
1
vote
1answer
290 views
Ball Physics : Bounce height altered by elasticity of ball and bounce surface
I have created a bouncing ball simulator using XNA and I am happy with my use of gravity, acceleration, change of direction and friction/spin.
However, I am now at a stage where I would like to ...
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 ...
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 ...
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 ...
3
votes
5answers
1k views
Determining the angle to fire a shot when target and shooter moves, and bullet moves with shooter velocity added in
I saw this question: Predicting enemy position in order to have an object lead its target and followed the link in the answer to stack overflow. In the stack overflow page I used the 2nd answer, the ...
3
votes
2answers
333 views
Collisions between moving ball and polygons
I know this is a very typical problem and that there area a lot of similar questions, but I have been looking for a while and I have not found anything that fits what I want.
I am developing a 2D ...
