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  • How to do reflective collisions with particles hitting background tiles?

    - by Shawn LeBlanc
    In my 2d pixel old-school platformer, I'm looking for methods for bouncing particles off of background tiles. Particles aren't affected by gravity and collisions are "reflective". By that I mean a particle hitting the side of a square tile at 45 degrees should bounce off at 45 degrees as well. We can assume that tiles will always be perfectly square. No slopes or anything. What are efficient methods and algorithms to do this? I'd be implementing this on a Sega Genesis.

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  • Trouble with UV Mapping Blender => Unity 3

    - by Lea Hayes
    For some reason I am getting nasty grey edges around the edges of rendered 3D models that are not present in Blender. I seem to be able to solve the problem by reducing the size of the UV coordinates within the part of the texture that is to be mapped. But this means that: I am wasting valuable texture space Loss of accuracy in drawn UV maps Could I be doing something wrong, perhaps a setting in Unity that needs changing? I have watched countless tutorials which demonstrate Blender default generated UV coordinates with "Texture Paint" which are perfectly aligned in Unity. Here is an illustration of the problem: Left: approximately 15 pixels of margin on each side of UV coordinates Right: Approximately 3 pixels of margin on each side of UV coordinates Note: Texture image resolution is 1024x1024

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  • Does swf provide better compress rate than zlib for png image?

    - by Huang F. Lei
    Somebody told me that when a png image is stored in swf, it's separated to several layer, hence the alpha channel can be compressed better. Is it true? Or, once png image is imported into a swf, it's format is changed, e.g converted into bitmap data, and than compressed by swf's compress algorithm. That's, it is not in png format anymore. I don't know how swf packing its resource, please tell me if you know.

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  • Efficient visualization of a large voxelized volume

    - by Alejandro Piad
    Lets consider a large voxelized volume stored in an oct-tree or any other convenient structure. This volume represents, for instance, a landscape, where each block is either empty (air), or it has an specific material that will be later used to apply a texture. Voxels that are next to each other represent connected sections of the surface. What I need is an algorithm to generate a mesh from this voxels that represents the volume, with the following caracteristics: All the "holes" in the voxelized volume are correct. All the connections are correct, i.e. seamless. The surface appears smooth. In a broad sense, I want to somehow preserve the surface topology, meaning that connected sections remain connected in the resulting mesh and that the surface has a curvature that responds to the voxels topology. Imagine trying to render the Minecraft world but getting the mountain ladders to be smooth instead of blocky.

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  • What to do with input during movement?

    - by user1895420
    In a concept I'm working on, the player can move from one position in a grid to the next. Once movement starts it can't be changed and takes a predetermined amount of time to finish (about a quarter of a second). Even though their movement can't be altered, the player can still press keys (perhaps in anticipation of their next move). What do I do with this input? Possibilities i've thought of: Ignore all input during movement. Log all input and loop through them one by one once movement finishes. Log the first or last input and move when possible. I'm not really sure which is the most appropriate or most natural. Hence my question: What do I do with player-input during movement?

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  • Which algorithm used in Advance Wars type turn based games

    - by Jan de Lange
    Has anyone tried to develop, or know of an algorithm such as used in a typical turn based game like Advance Wars, where the number of objects and the number of moves per object may be too large to search through up to a reasonable depth like one would do in a game with a smaller search base like chess? There is some path-finding needed to to engage into combat, harvest, or move to an object, so that in the next move such actions are possible. With this you can build a search tree for each item, resulting in a large tree for all items. With a cost function one can determine the best moves. Then the board flips over to the player role (min/max) and the computer searches the best player move, and flips back etc. upto a number of cycles deep. Finally it has found the best move and now it's the players turn. But he may be asleep by now... So how is this done in practice? I have found several good sources on A*, DFS, BFS, evaluation / cost functions etc. But as of yet I do not see how I can put it all together.

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  • How to create water like in new super mario bros?

    - by user1103457
    I assume the water in New super mario bros works the same as in the first part of this tutorial: http://gamedev.tutsplus.com/tutorials/implementation/make-a-splash-with-2d-water-effects/ But in new super mario bros the water also has constant waves on the surface, and the splashes look very different. What's also a difference is that in the tutorial, if you create a splash, it first creates a deep "hole" in the water at the origin of the splash. In new super mario bros this hole is absent or much smaller. When I refer to the splashes in new super mario bros I am referring to the splashes that the player creates when jumping in and out of the water. For reference you could use this video: http://www.ign.com/videos/2012/11/17/new-super-mario-bros-u-3-star-coin-walkthrough-sparkling-waters-1-waterspout-beach just after 00:50, when the camera isn't moving you can get a good look at the water and the constant waves. there are also some good examples of the splashes during that time. How do they create the constant waves and the splashes? I am programming in XNA. (I have tried this myself but couldn't really get it all to work well together) (and as bonus questions: how do they create the light spots just under the surface of the waves, and how do they texture the deeper parts of the water? This is the first time I try to create water like this.)

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  • Sony PSM SDK's 2D game engine

    - by Notbad
    I have started with the Sony PSM SDK this week, I'm interested in creating a little 2D game and have been reading through the web about a so called "2D game engine" integrated into the SDK. Some information I read suggested that it was added on January 2012, but I have been going through the documentation and haven't been able to find any reference to it. Does anybody know if they finally introduced the 2D game engine for the PSM SDK? Thanks in advance.

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  • Multiple Audio listeners in Scene

    - by Kevin Jensen Petersen
    THIS IS UNITY Im trying to make a FPS game over networking, it works fine. But now, when im trying to implement sound, it won't work. My guess would be, to add a Audio listener to the prefab, that gets instansiated whenever a player connects to the server, however the problem about this is that each player's audiolistener have been switched out which the other player(s), so the AudioSource won't play at the player, but at someone else in the game. Any suggestions ?

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  • Changing Palette for Day/Light Mode using GIMP

    - by J.C.
    Hello, Suppose I've a picture, which want to achieve day/light mode by changing 8bpp color palette. If I want the pixel index of my picture is always fixed for both day mode and night mode. For example, the 1st pixel index is 100. Which I can look up index 100 in day mode palette and night mode palette. How can I use GIMP to do so? My goal is to not update my pixel index of my picture. Also, as you see in two palette, they are not one one mapping. That is index 1 of the day mode palette and index 1 of the night mode palette may not used in the same pixel of the picture, how can I tackle this problem? Actually, my use case is as follow I want to use one 8bpp picture to achieve day/night mode by update only the color palette (without updating the pixel index). The advantage is I only have to prepare 2 256 byte palette rather than saving 2 big pictures in my limited data ram. Thanks a lot

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  • Semi Fixed-timestep ported to javascript

    - by abernier
    In Gaffer's "Fix Your Timestep!" article, the author explains how to free your physics' loop from the paint one. Here is the final code, written in C: double t = 0.0; const double dt = 0.01; double currentTime = hires_time_in_seconds(); double accumulator = 0.0; State previous; State current; while ( !quit ) { double newTime = time(); double frameTime = newTime - currentTime; if ( frameTime > 0.25 ) frameTime = 0.25; // note: max frame time to avoid spiral of death currentTime = newTime; accumulator += frameTime; while ( accumulator >= dt ) { previousState = currentState; integrate( currentState, t, dt ); t += dt; accumulator -= dt; } const double alpha = accumulator / dt; State state = currentState*alpha + previousState * ( 1.0 - alpha ); render( state ); } I'm trying to implement this in JavaScript but I'm quite confused about the second while loop... Here is what I have for now (simplified): ... (function animLoop(){ ... while (accumulator >= dt) { // While? In a requestAnimation loop? Maybe if? ... } ... // render requestAnimationFrame(animLoop); // stand for the 1st while loop [OK] }()) As you can see, I'm not sure about the while loop inside the requestAnimation one... I thought replacing it with a if but I'm not sure it will be equivalent... Maybe some can help me.

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  • Why does Farseer 2.x store temporaries as members and not on the stack? (.NET)

    - by Andrew Russell
    UPDATE: This question refers to Farseer 2.x. The newer 3.x doesn't seem to do this. I'm using Farseer Physics Engine quite extensively at the moment, and I've noticed that it seems to store a lot of temporary value types as members of the class, and not on the stack as one might expect. Here is an example from the Body class: private Vector2 _worldPositionTemp = Vector2.Zero; private Matrix _bodyMatrixTemp = Matrix.Identity; private Matrix _rotationMatrixTemp = Matrix.Identity; private Matrix _translationMatrixTemp = Matrix.Identity; public void GetBodyMatrix(out Matrix bodyMatrix) { Matrix.CreateTranslation(position.X, position.Y, 0, out _translationMatrixTemp); Matrix.CreateRotationZ(rotation, out _rotationMatrixTemp); Matrix.Multiply(ref _rotationMatrixTemp, ref _translationMatrixTemp, out bodyMatrix); } public Vector2 GetWorldPosition(Vector2 localPosition) { GetBodyMatrix(out _bodyMatrixTemp); Vector2.Transform(ref localPosition, ref _bodyMatrixTemp, out _worldPositionTemp); return _worldPositionTemp; } It looks like its a by-hand performance optimisation. But I don't see how this could possibly help performance? (If anything I think it would hurt by making objects much larger).

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  • Moving sprites on a graph in libGDX

    - by nosferat
    In my game I'd like to move sprites on a fixed path. Until this point I was trying to stick with the tools already provided by libGDX, like the Tiled map renderer classes so I'm looking for a solution nearly as convenient as that, e.g. I'd like to avoid creating the adjacency matrix by hand. Tiled has the functionality to add objects to the map but I'm not sure if I can use it for this purpose. Any idea?

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  • Resolution Independence in libGDX

    - by ashes999
    How do I make my libGDX game resolution/density independent? Is there a way to specify image sizes as "absolute" regardless of the underlying density? I'm making a very simple kids game; just a bunch of sprites displayed on-screen, and some text for menus (options menu primarily). What I want to know is: how do I make my sprites/fonts resolution independent? (I have wrapped them in my own classes to make things easier.) Since it's a simple kids game, I don't need to worry about the "playable area" of the game; I want to use as much of the screen space as possible. What I'm doing right now, which seems super incorrect, is to simply create images suitable for large resolutions, and then scale down (or rarely, up) to fit the screen size. This seems to work okay (in the desktop version), even with linear mapping on my textures, but the smaller resolutions look ugly. Also, this seems to fly in the face of Android's "device independent pixels" (DPs). Or maybe I'm missing something and libGDX already takes care of this somehow? What's the best way to tackle this? I found this link; is this a good way of solving the problem?: http://www.dandeliongamestudio.com/2011/09/12/android-fragmentation-density-independent-pixel-dip/ It mentions how to control the images, but it doesn't mention how to specify font/image sizes regardless of density.

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  • How to Generate Spritesheet from a 'problematic' animated Symbol in Flash Pro CS6?

    - by Arthur Wulf White
    In the new Flash Pro CS6 there is an option to generate spriteheet from a symbol. I used these tutorials: http://www.adobe.com/devnet/flash/articles/using-sprite-sheet-generator.html http://tv.adobe.com/watch/cs6-creative-cloud-feature-tour-for-web/generating-sprite-sheets-using-flash-professional-cs6/ And it works really well! An artist I'm working with created a bunch of assets for a game. One of them is a walking person as seen from a top-down view. You can find the .fla here: https://docs.google.com/folder/d/0B3L2bumwc4onRGhLcGNId1p2Szg/edit (If this does not work let me know, it is the first time I used Google Drive to share files) 1 .When I press ctrl+enter I can see it is moving. When I look for the animation, I do not seem to find it. When I select to create a spritesheet, flash suggest creating a spritesheet with one frame in the base pose and no other (animation) frames. What is causing this and how do I correct it? 2 .I want to convert it to a sprite sheet for 32 angles of movement. Is there any magical easy way to get this done? Is there a workaround without using Flash CS6 to do the same thing?

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  • Load different levels in XML

    - by Anearion
    my question is more about a theoretical gener than a pratical way to make things happen. I'm about start developing a game for android, text based so i won't need sprites or animation, nor a game engine. Let's say is similar to a sudoku game, where each level is an harder version of sudoku and each level has some question to be asnwered over the sudoku itself. I was wondering if the better way is to have only one XML and then inside all the different levels, each one with his meta-tags, or if the different approach of making n xml files where each one is a level is preferred. At the moment a level should have those tags: <level> <question>Question_1</question> <hint1>what does it do?</hint1> <hint2>where...</hint2> .... <hintN>how...</hintN> </level> So each level could have some items to read and that's what made me think that maybe different files are better cuz if i have to load lvl 10 i can read only the 10.xml file. I hope my question isn't too stupind. Thanks in advance

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  • Platformer gravity where gravity is greater than tile size

    - by Sara
    I am making a simple grid-tile-based platformer with basic physics. I have 16px tiles, and after playing with gravity it seems that to get a nice quick Mario-like jump feel, the player ends up moving faster than 16px per second at the ground. The problem is that they clip through the first layer of tiles before collisions being detected. Then when I move the player to the top of the colliding tile, they move to the bottom-most tile. I have tried limiting their maximum velocity to be less than 16px but it does not look right. Are there any standard approaches to solving this? Thanks.

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  • How to impale and stack targets correctly according to the collider and its coordinate?

    - by David Dimalanta
    I'm making another simple game, a catch game, where a spawning target game object must be captured using a skewer to impale it. Here how: At the start, the falling object (in red) will fall in a vertical direction (in blue) When aimed properly, the target will fall down along the line of the skewer. (in blue) Then, another target is spawned and will fall vertically. (in red) When aimed successfully again in a streak, the second target will fall along the skewer and stacked. Same process over and over when another target is spawned. However, when I test run it on the scene tab in Unity, when impaled several targets, instead of a smooth flow and stacking it ended up overlaying it instead of stacking it up like a pancake. Here's what it look like: As I noticed when reaching the half-way of my progress, I tried to figure out how to deal with collider bodies without sticking each other so that it will actually stack like in the example of the image at no. 3. Here's the script code I added in the target game object: using UnityEngine; using System.Collections; public class ImpaleStateTest : MonoBehaviour { public GameObject target; public GameObject skewer; public bool drag = false; private float stack; private float impaleCount; void Start () { stack = 0; impaleCount = 0; } void Update () { if(drag) { target.transform.position = new Vector3 (DragTest.dir.transform.position.x, DragTest.dir.transform.position.y - 0.35f, 0); target.transform.rotation = DragTest.degrees; target.rigidbody2D.fixedAngle = true; target.rigidbody2D.isKinematic = true; target.rigidbody2D.gravityScale = 0; if(Input.GetMouseButton(0)) { Debug.Log ("Skewer: " + DragTest.dir.transform.position.x); Debug.Log ("Target: " + target.transform.position.x); } } } void OnTriggerEnter2D(Collider2D collider) { impaleCount++; Debug.Log ("Impaled " + impaleCount + " time(s)!"); drag = true; audio.Play (); } } Aside from that, I'm not sure if it's right but, the only way to stick the impaled targets while dragging the skewer left or right is to get the X coordinates from the skewer only. Is there something else to recommend it in order to improve this behavior as realistic as possible? Please help.

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  • How do I import service references to Unity3D?

    - by Timothy Williams
    I'm attempting access a service reference in Unity. I need two: the SOAP framework and a separate service called ContentVault. The respective service URL's are: SOAP: http://api.microsofttranslator.com/V2/Soap.svc ContentVault: http://ioun.wizards.com/ContentVault.svc Both services import fine in to Visual Studio. I've tried everything I can think of but they won't work with Unity. I just get various errors (changing depending on which solution I'm trying out). I've attempted using svcutil to export the services as external scripts, but all I got was a bunch of using errors. I've tried converting the code to work with .NET 2.0 to no avail, I've even tried making the services in to .DLL's to no success. How could get these services working with Unity?

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  • Coding Dynamic Events?

    - by Joey Green
    I have no idea what the title of this question should be so bare with me. My game has turns. On a turn a player does something and this can result in a random number of explosions that occur at different times. I know when the explosions are done. I need to know when ALL are done and then do some other action. Also, each explosion is the same amount of time, say 3 seconds.. Right now I'm thinking of using a counter to hold how many explosions are happening. Then once the explosion is finished decrement this counter. Once the counter is zero, do my action. This idea is inspired by objective-c memory management btw. Anyways, does this sound like a good approach or would there be another way. An alternative might be to figure out the explosion who happened last and let it be responsible for calling this subsequent action. I'm asking mostly, because I haven't done this before and am trying to figure out if there are bugs that may occur that I'm not foreseeing.

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  • Collision Detection in Java for a game

    - by gordsmash
    Im making a game in Java with a few other people but we are stuck on one part of it, making the collision detection. The game is an RPG and I know how to do the collision detection with the characters using Rectangles, but what I dont know how to do is the collision detection for the maps. What I mean by that is like so the character cant walk over trees or water and that stuff but using rectangles doesnt seem like the best option here. Well to explain what the game maps are gonna look like, here is an example http://i980.photobucket.com/albums/ae287/gordsmash/7-8.jpg Now I could use rectangles to get bounds and stop the player from walking over the trees and water but that would take a lot of them. But is there another easier way to prevent the player from walking over the trees and obstacles besides using Rectangles?

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  • Omni-directional shadow mapping

    - by gridzbi
    What is a good/the best way to fill a cube map with depth values that are going to give me the least amount of trouble with floating point imprecision? To get up and running I'm just writing the raw depth to the buffer, as you can imagine it's pretty terrible - I need to to improve it, but I'm not sure how. A few tutorials on directional lights divide the depth by W and store the Z/W value in the cube map - How would I perform the depth comparison in my shadow mapping step? The nvidia article here http://http.developer.nvidia.com/GPUGems/gpugems_ch12.html appears to do something completely different and use the dot of the light vector, presumably to counter the depth precision worsening over distance? He also scales the geometry so that it fits into the range -.5 +.5 - The article looks a bit dated, though - is this technique still reasonable? Shader code http://pastebin.com/kNBzX4xU Screenshot http://imgur.com/54wFI

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  • Alternative ways to make a battle system in a mobile indie game more fun and engaging

    - by Matt Beckman
    I'm developing an indie game for mobile platforms, and part of the game involves a PvP battle system (where the target player is passive). My vision is simple: the active player can select a weapon/item, then attack/use, and display the calculated outcome. I have a concept for battle modifiers that affect stats to make it more interesting, but I'm not convinced this by itself will add enough of a fun factor. I've received some inspiration from the game engine that powers Modern War/Kingdom Age/Crime City, but I want more control to make it more fun. In those games, you don't have the option to select weapons or use items, and the "battling" screen is simply 3D eye candy. Since this will be an indie game, I won't be spending $$$ on a team of professional 3D artists/animators, so my edge needs to be different. What are some alternatives to expensive eye candy that you or others have used to make a non-3D PvP game more fun and engaging? Did the alternative concepts survive the release?

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  • Separate shaders from HTML file in WebGL

    - by Chris Smith
    I'm ramping up on WebGL and was wondering what is the best way to specify my vertex and fragment shaders. Looking at some tutorials, the shaders are embedded directly in the HTML. (And referenced via an ID.) For example: <script id="shader_1-fs" type="x-shader/x-fragment"> precision highp float; void main(void) { // ... } </script> <script id="shader_1-vs" type="x-shader/x-vertex"> attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; // ... My question is, is it possible to have my shaders referenced in a separate file? (Ideally as plain text.) I presume this is straight forward in JavaScript. Is there essentially a way to do this: var shaderText = LoadRemoteFileOnSever('/shaders/shader_1.txt');

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  • Loading a new instance of a class through XML not working quite right

    - by Thegluestickman
    I'm having trouble with XML and XNA. I want to be able to load weapon settings through XML to make my weapons easier to make and to have less code in the actual project file. So I started out making a basic XML document, something to just assign variables with. But no matter what I changed it gave me a new error every time. The code below gives me a "XML element 'Tag' not found", I added and it started to say the variables weren't found. What I wanted to do in the XML file as well, was load a texture for the file too. So I created a static class to hold my texture values, then in the Texture tag of my XML document I would set it to that instance too. I think that's were the problems are occuring because that's where the "XML element 'Tag' not found" error is pointing me too. My XML document: <XnaContent> <Asset Type="ConversationEngine.Weapon"> <weaponStrength>0</weaponStrength> <damageModifiers>0</damageModifiers> <speed>0</speed> <magicDefense>0</magicDefense> <description>0</description> <identifier>0</identifier> <weaponTexture>LoadWeaponTextures.ironSword</weaponTexture> </Asset> </XnaContent> My Class to load the weapon XML: public static class LoadWeaponXML { static Weapon Weapons; public static Weapon WeaponLoad(ContentManager content, int id) { Weapons = content.Load<Weapon>(@"Weapons/" + id); return Weapons; } } public static class LoadWeaponTextures { public static Texture2D ironSword; public static void TextureLoad(ContentManager content) { ironSword = content.Load<Texture2D>("Sword"); } } I'm not entirely sure if you can load textures through XML, but any help would be greatly appreciated.

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