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Questions tagged [textures]

A bitmap (raster image) used in a texture mapping process.

52
votes
7answers
47k views

Why are textures always square powers of two? What if they aren't?

Why are the resolution of textures in games always a power of two (128x128, 256x256, 512x512, 1024x1024, etc.)? Wouldn't it be smart to save on the game's file size and make the texture exactly fit ...
48
votes
9answers
36k views

Texture packing algorithm

What is a good texture packing algorithm? Technically, bin packing is NP-hard, so a heuristic is what I'm really after.
47
votes
3answers
6k views

Why are examples of game textures often represented on a sphere model?

I have recently started working with Unity and was looking for textures for the background (castle walls and such pieces) on a game that I am thinking about eventually building. I noticed that the ...
45
votes
5answers
35k views

How to avoid texture bleeding in a texture atlas?

In my game there is a Minecraft-like terrain made out of cubes. I generate a vertex buffer from the voxel data and use a texture atlas for looks of different blocks: The problem is that the texture ...
43
votes
1answer
5k views

How AAA games use this texture in the tone-mapping shader?

I found that Battlefield 3 as well as Saint's Row the Third use this texture in their final tone-mapping stage. Can anyone share a link to an article about how this texture is used? UPDATE: As there ...
40
votes
5answers
25k views

Should I use textures not sized to a power of 2?

In the early days of OpenGL and DirectX, texture sizes were required to be powers of two. This meant interpolation of float values could be done very quickly, using shifting and such. Since OpenGL 2....
35
votes
6answers
19k views

Creating a retro-style palette swapping effect in OpenGL

I'm working on a Megaman-like game where I need to change the color of certain pixels at runtime. For reference: in Megaman when you change your selected weapon then main character's palette changes ...
34
votes
3answers
17k views

How can I make a good-looking explosion particle effect?

I'm not much of an artist, but I'm trying to make decent particle effects in a 2.5D game. I'm making a replica of Wii Play's "Tanks" and I can't quite get the explosions to look good. I'm not going ...
27
votes
4answers
28k views

What are 3D textures?

Google has failed me, I could not find anything informative. So perhaps GameDev can :). What are 3D textures? When are they used? Performance costs? How are they stored? I have many vague ideas, but ...
26
votes
4answers
6k views

What is the difference between a Sprite and a Texture?

I have an assignment due for University, and my task is to discuss textures used within video games, and how they have evolved. My main question is, what is the fundamental difference between using ...
24
votes
4answers
25k views

What exactly is UV and UVW Mapping?

Trying to understand some basic 3D concepts, at the moment I'm trying to figure out how textures actually work. I know that UV and UVW mapping are techniques that map 2D Textures to 3D Objects - ...
23
votes
6answers
9k views

What happened to procedurally generated textures? [closed]

I recall some time ago that procedurally generated textures were becoming a big deal that a lot of people/companies were really interested in with some serious benefits (smaller deployments, ...
22
votes
2answers
4k views

Does a detailed texture take longer to render?

Let's say I want to render a square; its texture is "square.png." Is it easier for the computer to render it if the texture is just a plain color? And what about if it is a very noisy texture with ...
21
votes
2answers
14k views

Why are some games using some dithering pattern instead of traditional alpha for transparency?

Recently, I have seen some 3D games (eg: GTA IV) to use some kind of ordered dithering to simulate transparency / alpha. The polygons are not transparent as ...
21
votes
3answers
16k views

How does Megatexture work?

I've been thinking about developing a small engine not only to develop small experimental games, but also to serve as a base to test various rendering techniques and things like that. Right now I've ...
20
votes
2answers
29k views

How many textures can usually I bind at once?

I'm developing a game engine, and it's only going to work on modern (Shader model 4+) hardware. I figure that, by the time I'm done with it, that won't be such an unreasonable requirement. My ...
19
votes
4answers
6k views

Procedural Planets, Heightmaps and Textures

I am currently working on an OpenGL procedural planet generator. I hope to use it for a space RPG, that will not allow players to go down to the surface of a planet so I have ignored anything ROAM ...
18
votes
2answers
3k views

How does GPU handle texture and VRAM?

It's actually a bunch of inter-related questions: Are compressed textures (dxt5/dxt1 etc.) ever completely decompressed while going through rendering pipeline? If the answer to the first question is ...
17
votes
5answers
18k views

Preferred way to render text in OpenGL [closed]

I'm about to pick up computer graphics once again for an university project. For a previous project I used a library called FTGL that didn't leave me quite satisfied as it felt kind of heavy (I tried ...
16
votes
7answers
21k views

What are some cool examples of procedural pixel shader effects? [closed]

What are some good examples of procedural or screen-space pixel shader effects? No code is necessary; I'm just looking for inspiration. In particular, I'm looking for effects that are not dependent ...
16
votes
1answer
1k views

Suitability of ground fog using layered alpha quads?

A layered approach would use a series of massive alpha-textured quads arranged parallel to the ground, intersecting all intervening terrain geometry, to provide the illusion of ground fog quite ...
16
votes
1answer
11k views

Max texture size Android : which settings for 2048x2048?

I want to use a texture atlas of 2048 x 2048 in my game, and I would like to warn the users with a "too low" device to not download the game. With a texture atlas of this size, what requirements ...
16
votes
1answer
7k views

Procedural Mesh: UV mapping

I made a procedural mesh and now I want to apply a texture to it. The problem is, I cannot get it to stick the way I want it to. The idea is to have the texture painted only once over the whole mesh,...
15
votes
2answers
11k views

How do OpenGL's texelFetch and texture differ?

I understand the main differences between texelFetch and texture, but have some questions about the details: Does ...
15
votes
4answers
20k views

What's the difference between displacement mapping and height mapping?

What's the difference between displacement mapping and height mapping and what is the connection to adaptive tessellation?
14
votes
1answer
2k views

What is a texture atlas?

I've heard about this concept, but what is it?
14
votes
2answers
3k views

Speeding up procedural texture generation

Recently I've begun working on a game that takes place in a procedurally generated solar system. After a bit of a learning curve (having neither worked with Scala, OpenGL 2 ES or Libgdx before), I ...
13
votes
7answers
15k views

Best (Most Popular?) Image Format For Texturing [closed]

Okay, so I am using C++ with OpenGL, and I am going to create a loader to load in textures for my 3D game. (But the textures are 2D). I want the option of transparency, even if I decide not to use it. ...
13
votes
4answers
2k views

Avoid double compression of resources

I am using .pngs for my textures and am using a virtual file system in a .zip file for my game project. This means my textures ...
13
votes
1answer
2k views

How to reduce image size without pixelation?

I see lots of games with smooth edges characters and high res images, however when I try to reduce images to say 64x64 for my character I just get a pixelated mess. even if I start with a 64x64 canvas ...
13
votes
2answers
3k views

Should I be using spritesheets, because of or despite of my vast number of images?

I am developing a 2D game, and I have a lot of sprites. I used 3D animations and models to render into 2D, to give them that "Fallout" or "Diablo" look to them. It is also easier than drawing by hand, ...
13
votes
1answer
23k views

How to render a texture partly transparent?

Good Morning StackOverflow, I'm having a bit of a problem right now as I can't seem to find a way to render part of a texture transparently with openGL. Here is my setting : I have a quad, ...
13
votes
1answer
5k views

How does UVW texture mapping work?

I'm trying to understand the mathematical theory behind UVW mapping. Can anyone explain me how UVW mapping works? Or at least provide me a pointer?
13
votes
5answers
5k views

Tools for generating texture atlases/sprites from source images? [closed]

Is there an industry standard file format for texture atlases? What are the apps that take a directory of images and turns it into a texture atlas png and a text file describing what's on it? This ...
13
votes
3answers
2k views

How can I create my own sky maps? [closed]

What are the methods/tools for generating realistic skies with clouds and atmospheric shading? FOSS alternatives and spherical projections get extra points.
12
votes
4answers
46k views

Glass Material for Unity 5

Anyone know how to make a glass material in Unity 5? I can do metal and image textures, but not sure how to create a glass material. A search on Google would not get me anything for Unity 5 so it ...
12
votes
1answer
1k views

How do 2D art assets (eg. sprites) work?

I have an idea on a game and planning on developing a 2D game using XNA for Windows Phone 7. I've started off today by free hand drawing some concept art of what I want some of the characters to ...
12
votes
5answers
6k views

Skybox texture artifact on edge

I have strange problem with drawing skybox texture on Mac. On iPhone everything is going fine. I have tried to change near and far planes value with no success. It is a skybox of six textures, and ...
12
votes
4answers
5k views

How to deal with arbitrarily large images in 2D games?

Question When you have a 2D game that uses really large images (larger than your hardware can support), what do you do? Maybe there's some interesting solution to this problem that never occured to ...
12
votes
1answer
4k views

What is the optimal texture size?

I recently added a texture packager to my project that will pack a certain amount of textures into a single one, like this: So for example this one is 582x1023 pixels in size. The goal of adding ...
12
votes
5answers
79k views

How can I get started making textures for 3D games? [closed]

Just wondering where to find good tutorials on making textures for 3D games? Also, is it common practice to take photographs and convert them into game textures or do designers draw the textures ...
12
votes
1answer
787 views

How can I stop Substance's runtime texture caching?

Procedural textures with the Substance Engine seem to update very quickly if you turn off caching, modify one exposed variable at a time, modify it frequently, and even then only after you've ...
11
votes
2answers
17k views

What does changing GL_TEXTURE_WRAP)_(S/T) do?

I am working through some beginner OpenGL tutorials, and the current one teaches how to apply a texture to a simple rectangle. The tutorial states tells me to set the texture parameters ...
11
votes
2answers
526 views

How can I generate a texture that looks like left-over tea leaves?

We are working on a project for iPhone and Windows Phone 7 where we'd like to be able to generate tea leaves at the bottom of a cup. It doesn't have to look photo-realistic, and actually cartoon-y is ...
11
votes
3answers
1k views

How on earth do you get decent color out of 2BPP?

I've been looking into PowerVR textures, and have run into several textures that are apparently 2 bits per-pixel. This, frankly, boggles my mind. How does one get even half way decent color ...
11
votes
1answer
4k views

Texture atlas vs. array-texture: how differently are they handled by CPU and GPU and how that impacts performance?

Unity 5.4 (currently in beta), will bring a much awaited feature (since 2013) that is array-textures - in the same vain as OpenGL's ArrayTexture. However, after doing some reading about arrays-...
11
votes
1answer
558 views

XNA Adding Craters (via GPU) with a “Burn” Effect

I am currently working on a 2D "Worms" clone in XNA, and one of the features is "deformable" terrain (e.g. when a rocket hits the terrain, there is an explosion and a chunk of the terrain disappears). ...
10
votes
1answer
25k views

Best practices of texture size

I wanted to know how should I determine a good texture size ? Currently, I always create UV texture that are 1024x1024px but if I create for example, a big house with a 1024px texture size, it will ...
10
votes
3answers
3k views

Why is it possible to encounter a texture coordinate greater than 1 or less than 0

I'm studying a text about texture mapping and in the preparing to draw session, I read: Define the texture wrapping ...
10
votes
5answers
1k views

Texturing an asteroid

I'm trying to texture this asteroid so it looks reasonable. I'm missing something though. Following this tutorial, I got this so far. Now I don't understand the next step: how do you resolve the ...