1
vote
1answer
70 views

2D physics rotation w/ XNA

I'm creating a simple game with space ships made of blocks that are all the same size. After having looked at this: Calculating the rotational force of a 2D sprite I have created the following code ...
25
votes
5answers
1k views

Simulating pressure in a grid based liquid simulation

I have a 2D grid based water system in my XNA game, we have a method using cellular automata to simulate water falling and spreading. Example of water flowing down a slope: Each tile can contain a ...
0
votes
1answer
129 views

Formula throwing a ball to destination [duplicate]

I am throwing a ball using this: double v, vx, vy, alpha, t2 = 0; if (Keyboard.GetState().IsKeyDown(Keys.Up)) { alpha = MathHelper.ToRadians(60f); v = ...
0
votes
2answers
270 views

Making The Player Stop Bouncing And Stop Sinking In The Ground In A Platformer XNA

Heres a problem i've been having. I have a platformer, and whenever my player hits the ground he keeps bounding. Here's the falling code iceBoy.moveY++; iceBoy.position.Y += moveY; Now heres the ...
-1
votes
1answer
118 views

Bullets Spawning in same direction [closed]

I'm using XNA to make a Bullet Hell Shooter game, and I'm running into some troubles when I try to change the direction in which the bullets move. Been trying to debug for awhile, but haven't gotten ...
5
votes
2answers
424 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
1answer
436 views

Collision detection against specific sprite shape using XNA with Farseer Physics?

I am making a 2D XNA Game, using Farseer Physics for collisions. I need collisions to be resolved against the actual shape of the sprite image, ignoring transparent pixels, rather than against the ...
-2
votes
1answer
118 views

Help finding a good XNA physics library? [closed]

I'm looking for a good physics library for XNA. Can anyone help me find something good, simple and easy to learn for XNA?
1
vote
1answer
188 views

What is going on in this SAT/vector projection code?

I'm looking at the example XNA SAT collision code presented here: http://www.xnadevelopment.com/tutorials/rotatedrectanglecollisions/rotatedrectanglecollisions.shtml See the following code: private ...
5
votes
3answers
508 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 ...
6
votes
3answers
548 views

How do I make a moving object stop smoothly at the end of a path?

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
2answers
387 views

One-way platform collision

I hate asking questions that are specific to my own code like this, but I've run into a pesky roadblock and could use some help getting around it. I'm coding floating platforms into my game that will ...
4
votes
1answer
859 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
359 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 ...
1
vote
1answer
171 views

2D Physics Engine to Handle Shapes Composed of Multiple Densities XNA

The game I'm working on involves shapes that might be composed of multiple materials in a variety of ways. Let's just take for example a wooden rod with and sizable tip of iron or say a block composed ...
1
vote
2answers
283 views

Building a shape out of two rectangles

I would like to build a body with Farseer out of two rectangles so it looks like this: I am a real beginner, so please describe it carefully. Thanks in advance!
4
votes
2answers
372 views

Which techniques to study? [closed]

Just to give you some background info, I'm studying a programming major at a tertiary level and am in my third year, so I'm not a newbie off the street. However, I am still quite new to game ...
1
vote
2answers
877 views

How do I determine which side of the player has collided with an object?

I have some static bodies (platforms) and a dynamic body (the player) in my world. The collision between them works great, but I would like to know which side of the player (rectangle) collides with ...
1
vote
1answer
356 views

Ball Physics : Bounce height altered by elasticity of ball and bounce surface

I have created a bouncing ball simulator using XNA and I am happy with my use of gravity, acceleration, change of direction and friction/spin. However, I am now at a stage where I would like to ...
2
votes
1answer
855 views

How to implement Ragdoll physics to 2D characters in XNA?

I'm starting a new project with XNA. I want to create a game where the main character is subject to ragdoll physics when killed. I was wondering if anyone can give me any tips on how should I ...
3
votes
2answers
412 views

Collisions between moving ball and polygons

I know this is a very typical problem and that there area a lot of similar questions, but I have been looking for a while and I have not found anything that fits what I want. I am developing a 2D ...
2
votes
1answer
2k views

Farseer Physics collision detection vs intersection detection with sensors

I'm trying to make a game that uses Farseer physics engine as its main collision detection engine. I have a 2d circle body object that has a matching fixture (I used the CreatCircle method. I did not ...
4
votes
1answer
432 views

Making a multi-pieced rectangular breakable body with Farseer

Using Farseer 3.3.1 I want to create a rectangular BreakableBody with many pieces. Right now here is my code: Vertices polygon = PolygonTools.CreateRectangle( 2.5f , 1.25f ); List<Vertices> ...
19
votes
7answers
2k views

Optimizing gravity calculations

I've got a bunch of objects of varying size and velocity which gravitate towards each other. On every update, I have to go over every object and add up the forces due to gravity of every other object. ...
6
votes
3answers
2k 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 ...
8
votes
3answers
904 views

Tiling Physics using Farseer

I'm having a problem with the Farseer Physics Engine, where in a tiled environment, my object will at times interact with corners of others objects, even if they align perfectly. I've read about ...
4
votes
1answer
377 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 ...
1
vote
1answer
269 views

Determining relative velocities on impact?

I'm trying to figure out a way to determine the relative velocity of a body colliding with another in a 2D environment. For example if one body is moving at (1,0) and another traveling behind it ...