Tagged Questions

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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0
votes
1answer
454 views

moving box2d bodies in an arc or curved path

How can I make a b2Body move in a arc-like or curved path? I have heard about cocos2d Bezier curve function (ccBezier) but this is for moving cocos2d sprites. Or can it be modified to move box2d ...
-1
votes
1answer
639 views

Breakout… Getting the ball reflection X angle when htitting paddle / bricks [duplicate]

Im currently creating a breakout clone for my first ever C# / XNA game. Currently Ive had little trouble creating the paddle object, ball object, and all the bricks. The issue im currently having is ...
4
votes
1answer
8k views

How to detect collision in Unity3D without rigid bodies?

The target platform of my game is mobile devices therefore I try to develop it performance oriented. It will be a strategy game so I don't really need physics in it, consequently I did not add ...
6
votes
2answers
2k views

How to implement friction in a physics engine based on “Advanced Character Physics”

I have implemented a physics engine based on the concepts in the classic text Advanced Character Physics by Thomas Jakobsen. Friction is only discussed very briefly in the article and Jakobsen himself ...
3
votes
4answers
606 views

Math and physics, where to start? [closed]

the only math I know how is to add the velocity to position. Thats it. i would like to know how to do more stuff, physics, collision detection with stuff other than perfect circles, etc. But where ...
0
votes
1answer
2k views

Platforming - Hanging off of cliffs and edges? [duplicate]

Possible Duplicate: Programming a climbing system like tomb raider I've been interested in platforming gameplay dynamics for a while now. What I'm trying to ask is how games like Assassin's ...
0
votes
1answer
386 views

Bullet impact or force on cube in Blender

Hoping someone here may be able to help. I'm new to Blender (and game development/3d modelling) and have been following some tutorials online to get me started. I am building a very basic FPS just to ...
0
votes
1answer
478 views

android basic Movement for array-objects

I was adviced to start a seperate question for this so here I go. Been stuck so long with this do if you can help, please do. Lets get to it! Im trying to set the speed for my bullets, but since Im ...
2
votes
1answer
443 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 ...
0
votes
2answers
947 views

Calculating angle between two vectors to steer towards a target

I have been trying to implement a path following steering behaviour for AI in a 2D racing game. I have two vectors: futurePosition represents the predicted future position given the car's current ...
1
vote
1answer
294 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 ...
4
votes
2answers
402 views

What are the properties of “position, velocity, acceleration, rotation” collectively named?

They say naming things is one of the hardest problems in computer programming. They were right. Given the pseudocode below, what is a more appropriate name for this collection of properties? ...
2
votes
2answers
726 views

android 2d bullet-spawn (shooting)

This will be a quick question since Im pretty sure I'm overlooking something small that I for some reason cant see. My sprite is moved using a joystick, and I want my sprite to be able to shoot. I've ...
2
votes
2answers
385 views

Physics system imploding under force

I have a basic physics body system (incomplete/very basic; as collision resolution and detection are not implemented, just mass, position, velocity, acceleration, force and impulse). I implemented ...
9
votes
1answer
1k 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
2answers
287 views

Costs for developing an Iphone physics game?

I recently made a game demo inspired by a wooden board game where you drop the ball trying to make a score, is fully playable so take a look (Works best on firefox): ...
4
votes
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
880 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 ...
21
votes
3answers
2k views

Pros and cons of different integrators [closed]

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
437 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
620 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
574 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
1k 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
377 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
683 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
194 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
460 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
930 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
121 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
436 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
722 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
316 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
296 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
490 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
469 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 ...