Questions tagged [2d]

2D refers to two dimensional space where coordinates are represented with X and Y values.

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93
votes
3answers
15k views

How can I clean up excessive player-created rubble?

In my latest game I'm making, you can slice a 2D object arbitrarily, demonstrated in this gif: You can continuously cut it into hundreds or thousands of pieces. This doesn't create a lot of lag, ...
87
votes
8answers
73k views

Why don't more games use vector art? [closed]

It would seem to me that vector art is more efficient in terms of resources/scalability; however, in most cases I have seen artists using bitmap/rasterized art. Is this a limitation put on the artists ...
85
votes
3answers
39k views

How do I create 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. An illustrative part: Things hitting the water create waves. There are also constant "...
80
votes
9answers
13k views

How does one prevent homing missiles from orbiting their targets?

I am developing a 2D space game with no friction, and I am finding it very easy to make a homing missile orbit its target. I am curious about anti-orbiting strategies. A simple example is a homing ...
79
votes
5answers
25k views

Implementing a 2D destructible landscape (like Worms)

What steps would be involved in constructing a destructible 2D landscape, like in Worms? Ideally, What are some ways that this process could be made efficient as possible?
76
votes
26answers
63k views

Recommended 2D Game Engine for prototyping [closed]

What high-level game engine would you recommend to develop a 2D game prototype on windows? (or mac/linux if you wish) The kind of things I mean by "high-level" includes (but is definitely not limited ...
70
votes
7answers
42k views

What to consider when deciding on 2D vs 3D for a game? [closed]

How much "harder" is 3D than 2D in terms of: Amount/complexity of the code Level of math skills required Time involved in making art assets Original title: How hard is 3D game development versus 2D?
66
votes
9answers
15k views

2D graphics - why use spritesheets?

I have seen many examples of how to render sprites from a spritesheet but I havent grasped why it is the most common way of dealing with sprites in 2d games. I have started out with 2d sprite ...
66
votes
15answers
159k views

What tools do you use for 2D art/sprite creation? [closed]

What cheap/free tools do you use for 2D art and/or animation? I don't really like Gimp's interface, Paint.NET is limited and GraphicsGale is sort of archaic. Cosmigo ProMotion looks like it could be ...
63
votes
6answers
19k views

Are all games made by drawing each frame?

I am a beginner learning about computer animation(for games). So far, the only method that I have come across is drawing each frame, every frame update. So at the start of every frame, the entire ...
60
votes
9answers
17k views

Moving ships between two planets along a bezier, missing some equations for acceleration

OK, I already posted this over at math.stackechange.com but didn't get any answers :( First of here's a picture of my problem, the description follows afterwards: So I got all the points and ...
58
votes
9answers
48k views

New to creating AI - where to start? [closed]

I am new to game programming and am trying to make a basic 2d top-down space game with 2 space ships that fight each other. I am doing well with the user controlled space ship, but have no idea how ...
58
votes
4answers
31k views

How is 2D lighting implemented?

I am wondering what the best way to approach a "lighting" effect in 2D games is. For instance, if my main character is glowing, what techniques can I use to complete the visual effect of the character ...
57
votes
15answers
35k views

Cross Platform 2D Graphics Engines [closed]

I'm looking for a 2D graphics engine that would allow me to release to Windows, Mac and the iPhone, much the way Unity does for 3D. Is there a good engine that does this and is specific to 2D?
57
votes
3answers
15k views

Optimizing an XNA 2D game

Does it make sense to implement the logic to skip rendering objects outside the viewport or should I not care about it and let the Framework do it?
56
votes
2answers
6k views

How can I get textures on edge of walls like in Super Metroid and Aquaria?

Games like Super Metroid and Aquaria present the terrain with the other facing parts having rocks and stuff while deeper behind them (i.e. underground) there's different detail or just black. I would ...
52
votes
7answers
14k views

How do we convey scale in 2D games?

What methods can one use to let the player experience the size of a game world in a 2D game, be it Isometric or Orthogonal? When playing an open-world game in 3D, the player often is able to rotate ...
51
votes
7answers
10k views

2D Platformer AABB collision problems

I have a problem with AABB collision resolution. I resolve AABB intersection by resolving the X axis first, then the Y axis. This is done to prevent this bug: http://i.stack.imgur.com/NLg4j.png The ...
49
votes
3answers
6k views

What is the term for a 3x3 tile set used to create larger areas?

What is the pattern/design name of using a 3x3 tileset (usually in a tiled 2D game) that can be used to create larger areas of itself. For example, these: (Image source) I thought it was a "9 tree" ...
49
votes
6answers
46k views

Is OpenGL appropriate for 2D games?

I have been teaching myself the OpenGL library for a while now, and want to start making a game. However, for an easier introduction, I want to start with something 2D, such as a top down Pokemon-...
46
votes
6answers
18k views

How do we solve big video memory requirements in a 2D game?

How do we solve big video memory requirements in a 2D game? We are developing a 2D game (Factorio) in allegro C/C++, and we are facing a problem with increasing video memory requirements as the game ...
45
votes
4answers
22k views

How to render 2D particles as fluid?

Suppose you have a nice way to move your 2D particles in order to simulate a fluid (like water). Any ideas on how to render it? This is for a 2D game, where the perspective is from the side, like ...
43
votes
8answers
28k views

How to learn 2d animation? [closed]

Where can I learn how to do simple 2d animation well? Or is it really just literally drawing every single frame of something in photoshop? Is there tips or tricks? Tutorials to help get started? Also,...
41
votes
6answers
13k views

How would you handle different aspect ratios in a 2d platformer?

A long time ago, 4:3 was pretty much the only apect ratio you would find on a PC. Today the most common one is 16:10, but most new monitors (especially laptops) are 16:9 I'm writing a 2D platformer, ...
41
votes
5answers
2k views

Best Way to allow players to "Dye" images without losing color quality?

I am creating a 2.5D isometric (2D images) game. I want the players to be able to "dye" their armor, clothes, and other things. I find that grayscaling everything leads to losing out on some of the ...
40
votes
7answers
17k views

Learning To Create Better Art (2D Games)

Until one of my games "makes it" big, or I get flooded with gold ingots, I will have to handle most or all of my game art myself. The crux of my question is: how can I learn enough art to get beyond "...
39
votes
6answers
7k views

Hexagon collision detection for fast moving objects?

A object has a position and a speed vector. Usually only the position is used to check if two objects collide, this is problematic for very fast moving objects as it can happen that the object moves ...
38
votes
5answers
22k views

In 2D, how do I efficiently find the nearest object to a point?

I have a sizable game engine and I'd like a feature for finding the nearest of a list of points. I could simply use the Pythagorean theorem to find each distance and choose the minimum one, but that ...
36
votes
2answers
11k views

How do I make a character capable of walking on walls?

I am trying to get a character to move like a spider: Given a rising slope which a ball would normally not be able to roll up, the spider would slowly crawl up. Similarly, given a mid-air rectangular ...
36
votes
1answer
9k views

Rendering SVG art directly in XNA

Suppose I have a bunch of 2D art in some vectorized format such as SVG. Is there an easy-ish way to render that directly without having to implement a full SVG renderer myself? Of course I could ...
35
votes
2answers
5k views

Calculating the rotational force of a 2D sprite

I am wondering if someone has an elegant way of calculating the following scenario. I have an object of (n) number of squares, random shapes, but we will pretend they are all rectangles. We are ...
34
votes
11answers
10k views

Do 2D games have a future? [closed]

I'm currently working on a 2D soft-body physics engine (since none exist right now -_-), but I'm worried that there's no point to spending what will most likely be years on it. Although I love ...
34
votes
2answers
5k views

How can I procedurally render irregularly shaped health bars?

The issue of the traditional rectangular or heart-based health bar is something well-understood and easily solved. But what is the accepted solution for more "creatively-shaped" health bars, like the ...
33
votes
4answers
5k views

Why does my object move faster at 45° than at 90°?

I have objects in my game that move faster at 45 degrees then at 90 degrees. Each object has: Point (x,y) position Vector2D (x,y) direction Int speed And what I do during an update, is that a new ...
33
votes
11answers
78k views

In Pong, how do you calculate the ball's direction when it bounces off the paddle?

I'm trying to wrap my head around this very Hello World-y problem in game development. I've created a TicTacToe game in XNA so I guess the next step would be a Breakout clone. Keep in mind that I ...
32
votes
3answers
11k views

How do you approach resolution independence in raster based graphics content?

Those games that are not fortunate enough to run on a locked platform spec, like handhelds, need to run across various resolution formats and aspect ratios. In a 3D game you might have a HUD or menu ...
31
votes
1answer
13k 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?
30
votes
4answers
31k views

How can a programmer learn to draw 2D assets? [closed]

Are there any good tutorials for someone who wants to create 2D graphical game assets? Drawing classes for absolute beginners, preferably teaching skills that can be as relevant as possible to games - ...
29
votes
2answers
16k views

Algorithm for procedureral 2D map with connected paths

Problem to solve: Generate a random 2D dungeon map for a tile-based game where all rooms are connected. I am looking for better solutions than what I currently have. My current solution is that I ...
29
votes
6answers
12k views

A way to store potentially infinite 2D map data?

I have a 2D platformer that currently can handle chunks with 100 by 100 tiles, with the chunk coordinates are stored as longs, so this is the only limit of maps (maxlong*maxlong). All entity positions ...
28
votes
3answers
3k views

How does a 2D game like Zelda handle the character being behind buildings where only part of him is shown?

I'm trying to develop a simple Zelda-style game. I found this very useful topic How did LoZ: A Link to the Past handle sub-tile collisions? that I'm using as reference to develop my collision ...
27
votes
3answers
7k views

How can I identify feature regions in a procedurally generated world?

I'm building an Island. I use the classical heightmap solution : with a hill-building function, avoiding the corners of the map, I make altitude. Then, perlin noise give me some climatic variables to ...
27
votes
5answers
38k views

How can I calculate the angle and proper turn direction between two 2D vectors?

I am working on some movement AI where there are no obstacles and movement is restricted to the XY plane. I am calculating two vectors, v, the facing direction of ship 1, and w, the vector pointing ...
27
votes
3answers
76k views

What is the pixels to units property in Unity sprites used for?

I'm starting to learn Unity for 2D development. So, I am importing several sprites into the game, and I couldn't help but notice that there is a "pixels to units" property, by default on ...
26
votes
4answers
7k views

Top Down RPG Movement w/ Correction?

I would hope that we have all played Zelda: A Link to the Past, please correct me if I'm wrong, but I want to emulate that kind of 2D, top-down character movement with a touch of correction. It has ...
25
votes
3answers
22k views

What is a good book on physics for game development? [closed]

I'm looking for a good beginners' book on the subject of physics in game development. Something that focuses on 2D games would be preferable.
25
votes
2answers
4k views

Mega Man-style screen scrolling design

The NES classic Mega Man series uses a very specific scrolling technique that I'm having a hard time wrapping my head around implementing. Essentially, the level is divided into "screens" which are ...
24
votes
4answers
7k views

How to animate abstract 2d top down water texture?

I currently implement a game with a top down view of the ocean. I use the following, a little abstract texture: The actual texture is transparent, I added the green-like color for clarity. The ...
24
votes
5answers
11k views

How to quickly calculate the sight area in a 2D tiled game?

I have a matrix of tiles, on some of that tiles there are objects. I want to calculate which tiles are visible to player, and which are not, and I need to do it quite efficiently (so it would compute ...
24
votes
3answers
11k views

Best way to mask 2D sprites in XNA?

I currently am trying to mask some sprites. Rather than explaining it in words, I've made up some example pictures: The area to mask (in white) Now, the red sprite that needs to be cropped. The ...

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