Relating to the motion of objects through space and time. Including concepts such as acceleration (thrust and gravity), mass, collision response, friction and more.
5
votes
2answers
206 views
Calculating impulse propagation through a rigid body after a collision
I'm working on a game. I need to work out what the impulse is at different points on a body as a result of a collision.
For example, in the following diagram, if there is a collision that results in ...
4
votes
3answers
2k views
Why is my velocity decaying?
Programming in Java. Tinkering around with physics. My entities all have position and velocity. In the main loop, all I'm doing is applying gravity and bouncing off the edges, like so:
// add ...
4
votes
3answers
1k views
Determine Resulting Angle of Wall Collision
So I have an object moving in a direction towards a fixed horizontal or vertical wall. How do I compute the angle that the object should bounce off at? The object can approach the wall at an arbitrary ...
4
votes
1answer
260 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 ...
4
votes
2answers
481 views
How are physical model programmed in simulation games?
Being a Gran Turismo fan, I'm wondering what are the algorithms used to compute realistic behavior for friction, aerodynamism, velocity, curves etc.
Also, are there sophisticated ways to simulate ...
4
votes
3answers
473 views
Designing the main classes in a solar system simulation game in C++
If this is not the right place for this question, could you please direct me to a more suitable site/forum?
I'm a beginner in game development (and in the use of this site). I've worked with C++ only ...
4
votes
2answers
253 views
How to make a fan like behavior
I am making a game in Unity. I have an object e.g. cube. I want to release air from it like fan so that when other cubes come closer, it throws them away. What velocity,force etc I will need to do ...
4
votes
1answer
741 views
Character bouncing off ground due to gravity
Implementing gravity in the game, the character keeps bouncing up and down slightly when he hits the ground, upon debugging the character is essentially bouncing on and off the ground. Not quite sure ...
4
votes
2answers
237 views
Ball bouncing infinitely and constantly
Alright, so I've got hold of some simple physics mechanics, and am currently trying to implement bouncing. Based on the first answer of this question, I've developed the following algorithm:
...
4
votes
5answers
558 views
Is knowing physics necessary for game development?
Is knowledge of physics necessary to design quality games? How important is it? Be realistic and explain a few novice examples of how's mandatory.
What kind of physics is necessary, ...
4
votes
2answers
693 views
Calculating the angular direction from velocity
I'm trying to calculate the angular direction of a projectile, knowing it's X and Y velocity I can find the magnitude of its movement, but I'm having a hard time wrapping my mind around getting the ...
4
votes
1answer
153 views
What is the appropriate way to implement collision in 2D worlds?
If I want to create a 2D game map which features areas traversable by a player through standard up/down/left/right inputs, and then have areas that are NOT traversable... perhaps just a bush, or a ...
4
votes
1answer
252 views
Splitting logic into threads in Java tower defence game
I'm making a tower defence game in Java!
It's my first game development.
I want to know how many threads Do I need to create in a game, to split logic..
I've made this one:
Main App thread (adds ...
4
votes
1answer
338 views
How to balance a ball on a rotating plane?
I'm doing some research and I really don't want a physics engine when a simple mechanism will do. I have a ball that will be balanced on a plane. The ball will always be "stuck" to the plane and ...
4
votes
2answers
212 views
Controls for physics-enabled game object
I'm trying to put together 2D game on Flash ActionScript. Game objects positions are updated by physics library and I'm trying to control them applying forces and updating these forces every frame.
...
4
votes
1answer
215 views
2D car physics and high speed turning
I've been looking at the following page, which has been very helpful: http://www.asawicki.info/Mirror/Car%20Physics%20for%20Games/Car%20Physics%20for%20Games.html but have come into problems with the ...
4
votes
2answers
556 views
Get collision details from Rectangle.Intersects()
I have a Breakout game in which, at some point, I detect the collision between the ball and the paddle with something like this:
// Ball class
rectangle.Intersects(paddle.Rectangle);
Is there any ...
4
votes
1answer
469 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, ...
4
votes
1answer
558 views
How to make an object fly out of a slingshot?
At the moment I'm improvising a slingshot, the user can click and drag the projectile and let go.
The force on the object is calculated by getting the distance between the vector of the slingshots two ...
4
votes
1answer
754 views
How do engines like Unreal relate to OpenGL or D3D?
Well I'm completely completely new to computer graphics and even more to game development. I am searching info and all that stuff to have the basics quickly. But there's a big question mark in my ...
4
votes
3answers
373 views
How can I model the physics of an air blower?
I want to model simple lottery machine, it has got a bottom blower.
Do you know how can I get force applied to object above blower by air from blower, or equations to model this behavior?
Red ...
4
votes
3answers
510 views
Problem representing torque as a quaternion
Euler angles are much more intuitive to me than quaternions for representing 3-dimensional rotations. In fact, I barely understand quaternions at all. I use quaternions for rotation because people ...
4
votes
1answer
127 views
Automatically generate low detail collision meshes
I lately integrated Bullet Physics into my little game engine, but for now I only use basic shapes as spheres or boxes for collision checks. For more realistic physics I need collision meshes for all ...
4
votes
2answers
133 views
Simulate forces on a connected chain
I'm building a 2D space game where the player uses a chain to grab on to nearby asteroids. The asteroids move along a specific path with a constant velocity.
The chain has a maximum length L and ...
4
votes
1answer
227 views
Techniques for displaying vehicle damage
I wonder how I can displaying vehicle damage.
I am talking about a good way to show damage on screen. Which kind of models are common in games and what are the benefits of them? What is state of the ...
4
votes
3answers
1k views
Finding the contact point with SAT
The Separating Axis Theorem (SAT) makes it simple to determine the Minimum Translation Vector, i.e., the shortest vector that can separate two colliding objects. However, what I need is the vector ...
4
votes
4answers
848 views
Physics timestep questions
I've got a projectile working perfectly using the code below:
//initialised in loading screen
60 is the FPS - projectilEposition and velocity are Vector3 types
gravity = new Vector3(0, ...
4
votes
3answers
541 views
What do I need to change in Box2D to work in pixels?
Box2D seems to be set up in such a way that you cannot work in pixels (i.e. physics scale = 1). It produces very strange results as it hits maximum speed limits at low speeds and looks very strange. ...
4
votes
1answer
167 views
How display path ball will bounce?
I'm trying to figure out a way to show the path a ball will travel, so that the player can line up a shot before they fire the ball.
I can't think of a way to calculate this path in advance and ...
4
votes
1answer
3k 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 ...
4
votes
2answers
335 views
What AI technique should I use to control a car in a bumpy environment?
What kind of AI can you recommend controlling a car in a level where there are hills, sharp turns, straight parts, et cetera?
There is AI in the game already. It uses points on the road to which the ...
4
votes
1answer
417 views
Problem with impulses in my physics engine
I'm currently developing a small 3D impulse-based physic engine for a CS project. It uses GJK for collision detection and is kind of stable at the moment. Nevertheless, I'm not satisfied with my ...
4
votes
2answers
463 views
Particle and Physics problem
This was originally a forum post so I hope you guys don't mind it being 2 questions in one.
I am making a game and I got some basic physics implemented. I have 2 problems, 1 with particles being ...
4
votes
2answers
179 views
How to implement homing missiles with loops while in transit?
I have implemented missiles that steer towards a target, however this feels kind of boring.
I want to add loops! Loops are cool! To do this I thought I could use catmull-rom splines, but that seems ...
4
votes
4answers
472 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 ...
4
votes
3answers
534 views
IndexOutOfRangeException on World.Step after enabling/disabling a Farseer physics body?
Earlier, I posted a question asking how to swap fixtures on the fly in a 2D side-scroller using Farseer Physics Engine. The ultimate goal being that the player's physical body changes when the player ...
4
votes
1answer
770 views
How to make a 2D Soft-body physics engine?
The definition of rigid body in Box2d is
A chunk of matter that is so strong
that the distance between any two bits
of matter on the chunk is completely
constant.
And this is exactly what ...
4
votes
3answers
564 views
Kepler orbit : get position on the orbit over time
I'm developing a space-simulation related game, and I am having some trouble implementing the movement of binary stars, like this:
The two stars orbit their centroid, and their trajectories are ...
4
votes
1answer
340 views
Good book or tutorial for learning how to apply integration methods
I'm looking to animate a graph layout using edges as springs and nodes as weights (a node with more links will have a bigger weight).
I'm not capable of wrapping my head around the usage of ...
4
votes
3answers
143 views
Calculating buoyancy force
I am trying to simulate a buoyancy force for objects submerged/suspended in a fluid in a 2D environment.
According to Game Physics: Engine Development: How to Build a Robust Commercial-Grade Physics ...
4
votes
1answer
749 views
Correct way to use Farseer Physics in XNA
I am using Farseer Physics for my 2D sidescroller game and I'm not sure how to proceed with it. I currently have a Sprite class (handles nothing but graphics), a GameObject class (contains specific ...
4
votes
2answers
537 views
Simulating the effects of wind
I am developing a mobile game for Android. It is a 3D jumping game (like ski jump) where wind plays a important role so i need to simulate it. How could I achieve this?
The game uses libgdx for ...
4
votes
1answer
2k views
Farseer and 2D Action sidescroller game
I'm thinking about using Farseer inside my game (I'm not good in physics), which isn't a bad idea. However something happened while I was thinking about that, I found this tutorial:
...
4
votes
1answer
383 views
Taking Physics into account for AI Planning
What I've seen in most Game Engines and game engine design is that the Physics Engine is the be all end all system.
Basically, AI for example may want to travel to some position, but it simply ...
4
votes
1answer
303 views
How to take into consideration the effect of initial rotation of a ball hitting & reflecting off a surface
Hey all, I am trying to take into consideration the effect of inertia of the initial rotation of a ball, hitting a surface, into the exit velocity vector of the ball.
My current theory is this:
...
4
votes
1answer
116 views
Looking for very simple implicit integration example
I am trying to design a robust cloth system. I have no problem at all simulating things like that using forward integration such as euler, midpoint, runge-kutta, verlet, etc. However, I just can't ...
4
votes
1answer
208 views
Character Movement in 3D games
I'm either not searching correctly or there is really not a lot of material on Character Movement in 3D games.
I'm mostly interested in how people usually implement character movement in games like ...
4
votes
1answer
152 views
Networked Physics - Interpolation Causes Physics Engine to Explode
A major issue I am encountering right now is that my physics engine (BEPU) and my network interpolation are conflicting with each other.
The player is a physics object, and so the physics engine ...
4
votes
1answer
230 views
2D Car Simulation with Throttle Linear Physics
I'm trying to make a simulation game for an automatic cruise control system. The system simulates a car on varying inclinations and throttle speeds.
I've coded up to the car physics but these do note ...
4
votes
1answer
755 views
making a box2d body move along a Bezier curve/ arc path
I have been trying to make a box2d body move along a Bezier curve/ arc path. Most of the posts I've seen recommend an approach of manipulating SetLinearVelocity and SetTransform to arrive at an ...
