Tagged Questions
-1
votes
0answers
57 views
2D Rigid Body isn't working properly, gravity and impulses with SAT collision detection [closed]
I'm working on a game that should in the end be running on a small device and therefore I'm tryging to make it as small as possible, will only use boxes acting under the law of physics.
I'm not ...
1
vote
1answer
137 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
92 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
1answer
146 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
1answer
178 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
votes
3answers
255 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
1answer
217 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 ...
9
votes
1answer
258 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 ...
1
vote
0answers
222 views
physics of 2D car racing game with heightmap
I want to develop a simple car racing game where the road is defined by a heightmap. It looks basically like this:
The player can use throttle and brake to control the car.
I'm wondering what the ...
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:
...
1
vote
2answers
154 views
Basic plane kinematics
I never did physics in my life and this is really hard for me. I am currently trying to implement movement in the X and Y axis of a plane, in a video game I am making.
What I want to do is, given a ...
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 ...
5
votes
1answer
132 views
Physics/Logic behind self-bounce
I have a game that I am currently working on and I have a problem.
What would a ball look like when it makes itself bounce. Say, for example that the ball had its own "inner power", was made out of ...
25
votes
3answers
3k views
2D water with dynamic waves
New Super Mario Bros has really cool 2D water that I'd like to learn how to create.
Here's a video showing it. When something hits the water, it creates a wave. There are also constant "background" ...
1
vote
1answer
209 views
Point inside Oriented Bounding Box?
I have an OBB2D class based on SAT.
This is my point in OBB method:
public boolean pointInside(float x, float y)
{
float newy = (float) (Math.sin(angle) * (y - center.y) + Math.cos(angle) *
...
1
vote
2answers
126 views
Perpendicularity of a normal and a velocity?
I'm trying to fake angular velocity on my vehicle when it hits a wall by getting the dot product of the normal of the edge the car is hitting and the vehicle's velocity:
Vector2D normVel ...
3
votes
1answer
389 views
Engine for 2D Top-Down Physics-Based Skeletal Animation
I just watched at the Sui Generis video, and was completely amazed. Specifically, the part where the big troll thing is beating up the player with his flail.
This got me really excited, and I would ...
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 ...
0
votes
3answers
339 views
Can these game be fully coded in html5/javascript?
I mean the mechanics of the game. Would it be possible?
-Pokemon GBA series, rendering the world would be easy, but what about battle mechanics?
-MapleStory, after seen dragonbound.net which is an ...
2
votes
1answer
405 views
Trouble with AABB collision response and physics
I have been racking my brain trying to figure out a problem I am having with physics and basic AABB collision response. I am fairly close as the physics are mostly right. Gravity feels good and ...
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 ...
2
votes
1answer
404 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
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 ...
0
votes
0answers
110 views
Rendering light rays that intersect the viewport but have off-screen sources (XNA)
I am creating a very simple 2D navigation app in XNA. The grid/world starts at (1,1) and carries on to infinity in the East and South directions. The view-port shows the world without any scaling ...
0
votes
1answer
328 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
279 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 ...
2
votes
2answers
377 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 ...
8
votes
1answer
570 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?
2
votes
2answers
342 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 ...
3
votes
1answer
802 views
The Physics behind 2D Platformer Games?
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.?
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
647 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 ...
0
votes
1answer
111 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 ...
-1
votes
0answers
64 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();
...
1
vote
3answers
284 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 ...
1
vote
0answers
243 views
Need help with objects moving toward the player
I am making a 2D game with simple "gravity": everything is just pulled toward 0,0. The speed at which they accelerate towards it is GravityAcceleration up to MaxGSpeed.
I also want the player to be ...
0
votes
0answers
2k views
LibGDX Box2D Body and Sprite AND DebugRenderer out of sync
I am having a couple issues with Box2D bodies. I have a GameObject holding a Sprite and Body. I use a ShapeRenderer to draw an outline of the Body's and Sprite's bounding boxes. I also added a ...
11
votes
2answers
2k views
In a 2D platform game, how to ensure the player moves smoothly over sloping ground?
I'm developing a physics engine for a 2D platform game. I'm using the separating axis theorem for collision detection. The ground surface is constructed from oriented bounding boxes, with the player ...
2
votes
2answers
485 views
How do I handle walking up and down bridges at any angle?
I'm currently trying to create a 2D platformer puzzle game like Mario vs. Donkey Kong: Mini-land Mayhem! within Flash. My issues reside in the bridge collision with the walking AI.
The game allows ...
2
votes
1answer
2k views
Creating sideways friction in a 2D top down racer
I've been playing around with trying to create some kind of top down racer but I'm having trouble getting the car to turn properly. At the moment this is the code I have to update the position of the ...
2
votes
1answer
289 views
How do games using physic engines for 2d games handle platform corners?
I have seen games like latest "2'5D" sonics that handle collision detection at platform corners pretty well. The problem I'm having is that my game uses an ellipsoid as my player's body to let it ...
7
votes
3answers
819 views
How can I factor momentum into my space sim?
I am trying my hand at creating a simple 2d physics engine right now, and I'm running into some problems figuring out how to incorporate momentum into movement of a spaceship.
If I am moving in a ...
3
votes
4answers
328 views
Collision filtering techniques
I was wondering what efficient techniques are out there for mapping collision filtering between various bodies, sub-bodies, and so forth.
I'm working on a physics engine and I need ways for a user to ...
1
vote
3answers
387 views
Axis-Aligned Bounding Boxes vs Bounding Ellipse
Why is it that most, if not all collision detection algorithms today require each body to have an AABB for the use in the broad phase only?
It seems to me like simply placing a circle at the body's ...
9
votes
2answers
1k views
Continuous Physics Engine's Collision Detection Techniques
I'm working on a purely continuous physics engine, and I need to choose algorithms for broad and narrow phase collision detection. "Purely continuous" means I never do intersection tests, but instead ...
2
votes
5answers
688 views
Simulating water droplets on a window
How do I simulate water droplets realistically falling, gathering, and flowing down a window? For example, see http://www.youtube.com/watch?v=4jaGyv0KRPw. In particular, I want to simulate how smaller ...
6
votes
3answers
1k views
Is there a good existing starting point for realistic 2d racing car physics?
I'm trying to get a realistic behaving racing car into my 2d top-down game.
Making a very simple car that drives around is straight forward but I want a reasonably sophisticated model that models ...
16
votes
4answers
2k views
How to deal with corner collisions in 2D?
I'm writing a top down 2d XNA game. Since its my first I'm trying to write the physics and collision stuff myself to learn it.
Whenever my player sprite character attempts to move into a position ...
4
votes
2answers
694 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 ...
2
votes
2answers
362 views
Physics in a 2D oblique perspective game
So, just to clarify, because I'm still fuzzy on the terms for perspectives in older games myself, examples of an oblique perspective can be seen in many older RPGs (Earthbound, Final Fantasy, Secret ...
