Relating to the motion of objects through space and time. Including concepts such as acceleration (thrust and gravity), mass, collision response, friction and more.

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4
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1answer
1k views

AndEngine: Density, Elasticity, Friction, Gravity concepts

I am new to AndEngine. I have seen some physics examples from AndEngine Example package. I want to know the role of density, elasticity, friction and gravity while implementing physics. How they ...
2
votes
2answers
861 views

Changing sprite animation depending on direction

I'm working on an android game where my sprite is controlled by a joystick. I just added an animation to my sprite with 4 rows and 3 columns: Now I want to change the animation of my sprite ...
20
votes
3answers
2k views

Pros and cons of different integrators

When creating things like physics in games you need an integrator. I've seen Verlet integration mentioned several places as a great alternative to Euler integration. For instance in the famous ...
4
votes
1answer
2k views

The Physics behind 2D Platformer Games? [closed]

Is there any good book or tutorial that explains the physics behind creating a 2D Platformer game? Such as tile rendering, tile map reading, collision detection, camera movement etc.?
2
votes
1answer
164 views

Understanding Tensors [closed]

I don't seem to be able to visualize tensors. I am reading The Morgan Kauffman Game Physics Engine Development and he uses tensors to represent aerodynamics but he doesn't explain them so I am not ...
0
votes
0answers
138 views

Farseer non-colliding bodies affect eachother

I'm trying to use Farseer to make a tile engine, but bodies that are not colliding with a sprite are still having an effect on it. In this image there is a single sprite(the green box) and a single ...
1
vote
2answers
425 views

Aligning bullet's position in Asteroid Game

I'm writing an asteroid game and I would like to align the bullets on the ship's tip. I also want when the ship fires, the bullet gets the same orientation(angle, direction) of the ship and also be ...
5
votes
1answer
1k views

Predicting physics/trajectory for pool/billiards games

I'm thinking of making a quick proof of concept of a billiard-style game mechanic, where the player has perfect information of what is about to happen. Here's a good example: I'm only mildly ...
3
votes
1answer
595 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 ...
0
votes
2answers
547 views

Asteroids Ship Movement

I have read source code of asteroids game. I want to know why when updating the ship's position in X, and Y Axis, we must write it in sin and cosine of the current angle. Is it angular velocity ? why ...
4
votes
3answers
997 views

Interpolate and collisions

Lets take the simple example of a ball bouncing off a wall. The physics is separated from the display. The physics is set to run at say 20 frames per second and the display is running faster than this ...
-1
votes
2answers
367 views

How should I learn about collision detection?

If I want to use physics engine for my game then how should I go to learn collision-detection algorithms? When I read AI book for games, the book talks about collision detection, so I want to learn ...
6
votes
2answers
664 views

Show path of a body of where it should go after linear impulse is applied

I am making a game with Andengine and Box2D. I have a dynamic body and I apply linear impulse on the body to move it around when the user have touched the screen. Now I want to show the path where ...
2
votes
1answer
193 views

Electricity and Magnetism: Relevant?

The computer science major at my university requires that I take a sequence in either biology, chemistry, and physics, plus an additional natural science course (which I might fill with meteorology). ...
0
votes
3answers
2k views

collision resolve sphere-aabb and aabb-aabb

I am currently working on a basic physics engine which does not consider rotations. At the moment I work on collision resolving between aabbs and spheres. Unfortunately I have no idea what a collision ...
-1
votes
1answer
149 views

Interacting with box2D objects

How can I interact with an object in box2d, I'm completely new to this so I have no clue what to do. The box is created like this: bodyDef.type = b2Body.b2_dynamicBody; fixDef.shape = new ...
10
votes
3answers
450 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 ...
4
votes
1answer
904 views

Efficient physics and collision detection for RTS

I'm thinking about writing my own RTS game and while I'm more or less clear about how the game engine should work, I need some directions as to how to implement physics and collision detection. Now, ...
9
votes
2answers
1k 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 ...
-2
votes
1answer
2k views

What is the MTV (Minimum Translation Vector) in SAT (Seperation of axis)?

What is the MTV (Minimum Translation Vector) in SAT (Seperation of axis)? and how can i use it? Im trying to create my first game, where a ball can hit a a static brick (rectangle). Now if a ball ...
1
vote
1answer
120 views

Why is the MaskBit maxed out

Hi there for some reason the maskbit of my b2FixtureDef is being maxxed out and im not sure why Here is the declaration of the items that are used in the game enum PhysicBits { PB_NONE = 0x0000, ...
0
votes
1answer
126 views

How to properly simulate object aproximation towards camera in 2D?

I'm trying to make some objects come towards the camera but it just doesn't feel right... you can check the progress here: http://testing.fyrastudio.com/lab/tweetOlympics/v0.005/ You run by ...
4
votes
2answers
1k views

How to achieve smooth gameplay in a physics based multiplayer game? (2d)

I'm using cocos2d 2.0 and Gamekit for networking. I've got a server/client model. It works over wifi (local) and bluetooth. (Xcode 4.3, Objective C) Basically, there's a ball and 2 or more players. ...
0
votes
1answer
424 views

How to implement the rag doll physics in OpenGL?

I'm wondering, having a human model made in blender, how can you make it so that at some point (when the human "dies") the body follows the rag doll physics in OpenGL? I tried looking for some ...
3
votes
4answers
3k views

2D Collision in Canvas - Balls Overlapping When Velocity is High

I am doing a simple experiment in canvas using Javascript in which some balls will be thrown on the screen with some initial velocity and then they will bounce on colliding with each other or with the ...
0
votes
3answers
700 views

Game Institute Math Courses

I'm 21 years old and I suck at math, I mean really bad. I don't have the necessary logic to apply it towards programming. I would like to learn the math and logic of applying it. I found Game ...
4
votes
1answer
312 views

How to synchronise the acceleration, velocity and position of the monsters on the server with the players?

I'm building an MMO using Node.js, and there are monsters roaming around. I can make them move around on the server using vector variables acceleration, velocity and position. acceleration = ...
2
votes
2answers
291 views

Physics from other games

I'm making a platform engine with XNA Game Studio, and I've solved almost everything about colliding stuff. But now, I'm searching for good physics for the player, I'm trying to emulate characters ...
0
votes
1answer
188 views

Will my game engine be compatible with physics engines?

My engine supports Scene handling, Cameras, and has a Renderer. Also, it has a class called Drawable, which has the position, the shape and the picture of an object. The picture property has width, ...
6
votes
2answers
465 views

Elliptical orbit modeling

I'm playing with orbits in a simple 2-d game where a ship flies around in space and is attracted to massive things. The ship's velocity is stored in a vector and acceleration is applied to it every ...
4
votes
3answers
1k views

Quaternion dfference + time --> angular velocity (gyroscope in physics library)

I am using Bullet Physic library to program some function, where I have difference between orientation from gyroscope given in quaternion and orientation of my object, and time between each frame in ...
2
votes
2answers
1k views

Simple 2D Flight Physics with Box2D

I'm trying to build a simple side scroller with an airplane being the player. As such, I want to build simple flight controls with simple but realistic-feeling physics. I'm making use of cocos2D and ...
1
vote
2answers
463 views

How to calculate continuous motion with angular velocity in 2d

I'm really new with physics. Maybe someone would be able to help me to solve the next problem: I need to calculate position of an agent on the plane(2D) in next time step where time step is large(20+ ...
2
votes
4answers
1k views

Should I used Box2D for a Flash platformer or use something for gaming like Fixel or Flashpunk?

I'm trying to make a platformer with Flash/AS3 and have been looking for something to help with some of the collision etc. I've look at a few engines and Box2D/WCK seems the most sophisticated. Do I ...
1
vote
1answer
467 views

Change density of the body dynamically

In my game, I want to change density of my body object when it collide with other objects. I found something like following to change density but further I could not able to find any hint for this. So ...
3
votes
1answer
1k views

Platformer Starter Kit - Collision Issues

I'm having trouble with my game that is based off the XNA Platformer starter kit. My game uses smaller tiles (16x16) then the original (32x40) which I'm thinking may be having an effect on collision ...
0
votes
1answer
400 views

Calculating instantaneous speed and acceleration for a simple car software model

I am trying to model a speedometer and tachometer for a simple software model of a car dashboard. I want this to be relatively simple, so for my purposes I won't likely simulate variables such as drag ...
2
votes
1answer
270 views

Units of measurement in a tile world

I've started to make a 2D sidescroller, the camera and world rendering works as I expect, but now comes the physics part of world. What I need is that one tile in x or direction should correspond to ...
1
vote
1answer
356 views

From simple physics with a ball, to a more complicated shape

Hello fellow game devs and stack overflowers... I recently made a transition from OpenGL ES 1.1 to 2.0 (on Android via NDK) and things are going well so far. I'm working on doing a dice rolling ...
22
votes
2answers
11k views

How to make a character jump?

I am currently making a game in C# using Direct X 9.0. The game remake is Donkey Kong NES. I have nearly everything completed, but I am having problems with the physics of Mario's jump. I have ...
3
votes
1answer
225 views

Framerate control and physics engines?

I am reading this article on how to control the framerate and physics calculations. But in the game I am writing, I use a third party physics library and the only thing I do to update my physics is ...
2
votes
2answers
746 views

How to implement physics and AoE spells in an MMO game?

I'm making a game which will be completely centered around PVP battlegrounds and arenas. Think something like WoW, but with the RPG part removed. There will just be a lobby, where you can join a ...
-1
votes
0answers
67 views

ball 2d animation [duplicate]

Possible Duplicate: canvas ball physics animation I want to animate ball in html canvas like this. ctx.beginPath(); ctx.arc(75, 75, 10, 0, Math.PI*2, true); ctx.closePath(); ctx.fill(); ...
0
votes
1answer
444 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
3answers
392 views

2D Physics in a networked game (iOS)?

I am researching the possibilities for a new iOS game. It's going to be a run-n-gun type platformer, and I'm looking into the possibility of co-op multiplayer. The game itself wouldn't be very ...
3
votes
0answers
203 views

How can I stop my Jitter physics meshes being offset? [closed]

I'm developing a C# game engine and have hit a snag trying to add physics. I'm using XNA for graphics and Jitter for physics. I am trying to split the XNA model into it's meshes, then create a ...
0
votes
1answer
536 views

what is the difference between CCSprite and a PhysicsSprite?

I am new to Cocos2D and I've realized that most of the codes written before the Cocos2d update used CCSprites. Recently I realized a lot of more recent codes after the update are using PhysicsSprite. ...
11
votes
6answers
3k views

Ball Physics : Smoothing the final bounces as the ball comes to rest

I've come against another issue in my little bouncing ball game. My ball is bouncing around fine except for the last moments when it is about to come to rest. The movement of the ball is smooth for ...
2
votes
1answer
1k views

Getting started using C# and Physics (Resources, Tutorials, Samples, etc.) [closed]

As an application developer, I plan on now getting started in game development so I have come along to this site. I am a proficient C# developer so I guess it makes sense to start game development in ...
3
votes
1answer
140 views

Smoothly move between bodies

I'm not sure if the title is correct (please comment if it is not). I have a sprite (rectangle body), and I'm applying force on it to make it move from left to right and then go backward. The platform ...