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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5answers
1k views

Collision detection logic

Edit 2 In the following picture sprite1 (the red square) is hitting the platform from the left, so: sprite1_rightEdge>platformSprite leftEdge would be true, so I can simply reposition ...
8
votes
2answers
387 views

Drone targeting

Imagine a "drone" and a target point on a 2d plane. There are eight parameters: P = my position Q = target position V = my velocity I = my moment of inertia w = my angular velocity s = my angular ...
0
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2answers
120 views

making different kind of bullets [closed]

I have an enemy which shoots 3 different kind of bullets. They are of different sizes, speed, and representation (rectangle, oval, and a more classic bullet). Should they be 3 separate classes or ...
0
votes
1answer
69 views

Implementing Frame of reference for physics calculations

How would I alter physical calculations to account for frame of reference of a physical body? Currently I have a world that is a collection of rigid body objects that act on each other. There is no ...
8
votes
1answer
272 views

How do I fix objects “popping” or jittering in physics engine?

I've got a simple physics engine that solves collisions by simply correcting the position of overlapping bodies (just circles for now) directly, as opposed to just changing the velocity or applying an ...
6
votes
1answer
243 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 ...
0
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1answer
293 views

Is there a “box2d without physics” lib (only for collision detection)?

Box2d Collision detection algorithms are probably the best ones out there. Unfortunately, they are bundled together with a realistic physics engine that I don't need. Is there an open source project ...
11
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1answer
1k views

Pathfinding on a uneven planetary surface

My question is what would be the best approach to pathfinding on an uneven planetary surface? Background Information I have created a planet from displacement mapping 6 sphere projected planes. ...
5
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1answer
258 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 ...
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votes
1answer
146 views

Is there any physics engine for XNA? [closed]

I am an XNA game developer. I am now starting to develop physics games on XNA but the problem is that I don't know about any physics engine desinged for XNA. Please if you know about it kindly help ...
1
vote
1answer
660 views

Is using Box2D for simulating gravity “in space” a good idea? [duplicate]

I'm attempting to write a simulation of a solar system of planets in 2D space that are attracted to each other through Newton's law of universal gravitation. I know that it is possible to simulate ...
2
votes
2answers
149 views

implementing a 2d looping using a physics engine

I am implementing a 2d mobile racing game. I have already implemented a 2d terrain using a physics engine (using edges). Now i would like to implement a looping very similar to the one in the old ...
1
vote
2answers
283 views

How can I manage large numbers of objects in a physics engine? [duplicate]

MY friend and I are programming a game and I decided to give the physics engine a try. I was able to get a class working where it would calculate out the total force on a model and apply the correct ...
1
vote
1answer
170 views

Simple 3D particle gravity in javascript? [closed]

I'm trying to do some simple gravity handling in my 3D environment (I'm using three.js). I've got some code, but it doesn't work. I'm hoping it's just a silly bug somewhere. Note: This is a ...
11
votes
2answers
841 views

Implementing a homing missile [duplicate]

I'm having some trouble implementing a homing missile that satisfies what I'm looking for. I have already tried the Seeking and Arrival behaviours described in this link, but none of them were what I ...
-1
votes
1answer
182 views

Creating physics in xna

I am creating a racing game using visual studio 2010 and xna 4.0. I'm trying to create some simple physics so my car sticks to the heightmap I have created within my game world and the model adjusts ...
2
votes
1answer
433 views

Physics engine for Billiard game [closed]

I need to write a simple 3D billiard game using OpenGL. Which physics engine is simple and best to use in this case? Or it's better to write physics by myself?
1
vote
1answer
91 views

Physics Simulation - Pushing an object with user control

I'm working on a 2D game engine using C, SDL and OpenGL. Have worked out basic graphics, physics, and broad phase collision detection. I am trying to realistically simulate "pushing" objects around. I ...
1
vote
1answer
315 views

Swarm/crowd movement with box2d?

Apart from using b2Body::setTransform(), are there other ways to move a body around while keeping its dynamics ? I want to move several bodies at the same time into one direction, pretty much like ...
2
votes
3answers
897 views

How should I calculate the new angle/direction of my ball hitting a wall? [duplicate]

I'm building a Pong game and I am stuck at how the ball should bounce when hitting a horizontal wall. I tried a few methods but none seems to work. So far I have an update method, which is called ...
1
vote
2answers
344 views

Regarding physics engines and the GPU

The rigid body physics engines that use a "bounding box" for collision detection, I am aware of how they are created. What I want to know is, is there a physics engine that does not use "bounding ...
0
votes
1answer
135 views

Gravity/collision problems: models jumping

I'm pretty new to Unity3D game engine and game development, so don't judge me strictly. I import a model of the rail track, add rigid body component (with mass 1 and use gravity flag) and box collider ...
3
votes
1answer
347 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 ...
0
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3answers
473 views

How to make 2d map that isnt based on tiles

I am working on a game, and need to make a 2d map that isnt based on tiles. An example of something similar to what I want is all those racing games like "bike race" where the map is just somewhat a ...
4
votes
2answers
272 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 ...
0
votes
1answer
145 views

Simulating building stress [closed]

I need to simulate the effects of adding supporting materials to a building structure for a genetic algorithm in a block-based world. Essentially I am planning to use a genetic algorithm to optimise ...
1
vote
1answer
247 views

Pick and Drop the Ball Testing Without Replicating the Physics Frame

I am making a program that pick, drag, and drop the ball. In real life, once you pick the ball and drop it, whenever the available object is (what you see is what you get) will only be picked and ...
10
votes
3answers
493 views

How to implement collision detection of portals?

For example, take this scenario (excuse my horrible drawing skills): This is based on "Portal", where the stickman is going through the blue portal (which is linked to the red portal), but there is ...
5
votes
1answer
770 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 ...
3
votes
1answer
336 views

Fluid Particle Grid

So recently I have been looking at some fluid simulation techniques, specifically Smoothed Particle Hydrodynamics. One of the key components is a grid to avoid O(n^2) searches. I have been having some ...
4
votes
2answers
369 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 ...
6
votes
3answers
361 views

How can I change the acceleration of an object to arrive at a particular time?

I'm trying to write some code to change an acceleration factor so a ball will arrive at a destination in a desired time. The problem is I don't know time (t) but I do know I want it to arrive at (t - ...
7
votes
4answers
1k views

Making a Box2D ball bounce to constant height

I want to create a game like Doodle Jump. I'm using libgdx and Box2d. I needadvice on how to make my ball bounce constantly and with the same height. I've tried setting the ball's body restitution ...
2
votes
2answers
311 views

Applying Angular Acceleration in a Basic Physics Model

I'm attempting to use a basic physics system to create an arcade flight model. So far I have managed to get the aircraft moving forward, apply gravity, etc. However, after trying to implement torque I ...
7
votes
2answers
5k views

Typical Maximum steering angle of a real car

I'm building a car sim in Unity3D. I'm trying to set the properties of the car to be as realistic as possible. I can't seem to get a straight answer on Google so I thought of asking here. What is the ...
9
votes
1answer
388 views

Getting a 2D “pixel” cloud to follow a mouse

I'm working on a 2D game trying to get a "cloud" of a few hundred tiny cubes or discs to follow my mouse cursor without overlapping each other. However, using the physics engine introduces ...
0
votes
2answers
145 views

Problem with sensor in box2d [closed]

I have two bodies: one green static sensor (spikes) and one orange dynamic body (brick). I have bullet and it's a dynamic body too, but with bullet flag set. My problem is that when the bullet is ...
5
votes
1answer
467 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 ...
1
vote
0answers
961 views

Why do restitution values less than one still cause infinite bouncing in Box2D?

I'm currently trying to implement basketball bouncing into my game using Box2d (jBox2d technically), but I'm a bit confused about restitution. While trying to create the ball in the testbed first, ...
0
votes
1answer
286 views

Jump function of player [duplicate]

I'm developing game in marmalade sdk in c++. I have player in the area.and I wanna make him jump when i pressed a button.When I use this player.moveUp(5px); it just go up 5px, but he has to fall down ...
0
votes
2answers
84 views

Checking bounds of a quad

I want to know how would I tell if a quad touches another quad in my game built in Slick2D. I have a class that I named "Bounds" which has 4 "Point" objects which just store an X and a Y value and a ...
4
votes
1answer
258 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 ...
1
vote
2answers
179 views

Distribute circles evenly on Screen - circle packing

I want to evenly distribute a random amount of circles with random diameter on the screen for. This level doesn't scroll so the users screen resolution sets the limits. Further I would like the ...
2
votes
1answer
159 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. ...
1
vote
1answer
224 views

C++ Using clock() with IsKeyDown

I am trying to replicate the game Asteroids as a class project. I am having trouble measuring the time elapsed while the "W" key is pressed. This code is supposed to increase the force applied to the ...
6
votes
3answers
559 views

Need physics algorithm for modeling ceiling collapse in voxel-based game

I'm looking for algorithms on how to model the physics of cave-ins/collapses for a game idea I am working on. The game allows the player to extensively mine 3D voxel-based asteroids, and I want areas ...
10
votes
4answers
709 views

Run a physics simulation on both client and server?

I'm implementing a multiplayer asteroids clone to learn about client/server network architecture in games. I have spent time reading GafferOnGames and Valve's publications on their client/server ...
2
votes
1answer
499 views

How to calculate collision normal between two AxisAlignedBox's?

I'm writing a physics simulation in Ogre3D and I'm trying to figure out how to calculate the collision normal between two Ogre::AxisAlignedBox's. I am checking for collisions using the "intersects" ...
12
votes
3answers
1k views

Resolving a collision with forces

In my 2D physics engine, I can detect AABB vs AABB collisions, and resolve them by finding the shortest penetration vector and adding it to the AABB's position. Doing this "pushes" the first AABB ...
3
votes
1answer
327 views

How to emulate knob turning, based on x/y movement?

I'm doing a game where one component is that you turn a knob. I'm having trouble getting good "knob behavior". I know the current touch/mouse X,Y location, and I keep track of the previous X,Y ...