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• Do I lose/gain performance for discarding pixels even if I don't use depth testing?

  - by Gajoo

  When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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• Can a local multiplayer iOS game display differently for each device?

  - by Rahil627

  I've seen games which display different data for two devices, but not more than two. If possible, can it be accomplished using GameKit? EDIT: More specifically, I was thinking local multiplayer via bluetooth or wi-fi on an iOS device. Most games I've seen display the same screen synchronized across all of the devices. I understand games that network across the internet do this, often using a server, but I haven't seen any examples of a 3+ device local multiplayer iOS game. I just want to make sure it wasn't some kind of limitation.

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• Why does this exported cube have too many vertices?

  - by Joewsh

  I'm trying to export md5mesh models. Just as a test I decided to export a simple cube (i.e. with 8 vertices). When I opened the .md5mesh file it lists the following: numverts 24 numtris 12 numweights 24 Obviously the number of triangles makes sense: 6 faces * 2 to triangulate = 12. The model only has one bone so again it even makes sense that there is one weight for each vertex. The question is though, why is the file listing 24 vertices? Is the problem the exporter or is this normal for md5mesh's? Is it something that you have to rectify when you come to parsing the file in engine? I don't want to be parsing or drawing duplicated vertices without reason. I'm guessing it's something to do with shading and normals. Is it a case of listing each vert 3 times, one for each facing normal?

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• Position sprite at center of screen

  - by Wellie

  I am trying to get a sprite to position itself at the center of the screen but nothing seems to be working for me. I'm trying Viewport viewport = graphics.GraphicsDevice.Viewport; logoPosition = new Vector2((viewport.Width - towerImage.Width) / 2, (viewport.Height - towerImage.Height) / 2); and spriteBatch.Draw(towerImage, centre, null, Color.White, 0, baseOrigin, 1.0f, SpriteEffects.None, 0); This is my first time using XNA and I don't really have a clue what I'm doing.

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• Choosing the correct network protocol for my type of game (its Wc3 Warlock style)

  - by Moritz

  I need to code a little game for a school project. The type of the game is like the Warcraft 3 map "Warlock", if anyone doesnt know it, here is a short description: up to ten players spawn into an arena filled with lava, the goal of each player is to push the other players into the lava with spells (basically variations of missiles, aoe nukes, moba spells etc) http://www.youtube.com/watch?v=c3PoO-gcJik&feature=related we need to provide multiplayer-support over the internet, for that reason I am looking for the best network protocol for this type of game (udp, tcp, lock step, client-server...) what the requirements are: - same/stable simulation on all clients - up to ten players - up to ~100 missiles on the field - very low latency since its reaction based (i dont know the method wc3 used, but it was playable with the old servers) what would be nice (if even possible, since the traffic might be too big): - support for soft bodies over the network (with bullet physics), but this is no real requirement I read several articles about the lock step method used for RTS games, this seems to be great, but does it fit for real-time action games too (ping-related)? If anyone has run into the same problems/questions like me, I would be very happy about any help

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• How does N create it's tileset?

  - by Darestium

  I am trying to recreate a Multiplayer version of the popular flash game N in java. I have a single question however. Are the tiles for the games draw or are they defined with mathamatical formulars/In code? Since I do see how they would scale up in flash if they were not. So if anyone has any ideas how I should go about creating the tileset, or how they are created in the game please let me know. You can check out the game here.

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• OpenGLES 2.0 gluunProject

  - by secheung

  I've spent more time than i should trying to get my ray picking program working. I'm pretty convinced my math is solid with respect to line plane intersection, but I believe the problem lies with the changing of the mouse screen touch into 3D world space. Heres my code public void passTouchEvents(MotionEvent e){ int[] viewport = {0,0,viewportWidth,viewportHeight}; float x = e.getX(), y = viewportHeight - e.getY(); float[] pos1 = new float[4]; float[] pos2 = new float[4]; GLU.gluUnProject( x, y, 0.0f, mViewMatrix, 0, mProjectionMatrix, 0, viewport, 0, pos1, 0); GLU.gluUnProject( x, y, 1.0f, mViewMatrix, 0, mProjectionMatrix, 0, viewport, 0, pos2, 0); } Just as a reference I've tried transforming the coordinates 0,0,0 and got an offset. It would be appreciated if you would answer using opengl es 2.0 code. Thanks

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• Restricted pathfinding Area

  - by SubZeron

  So i'm triying to create a little "XCOM : Enemy Unknown" like game ,and using the Aron Granberg's Pathfinding-Tool (free version) to handle the "click to move part. i want to add a little trap system where the hero get stuck inside an area, so he will have only the possibility to move inside this trapped area, so far everything is fine however when i click outside the trapped area, the hero try to reach the destination even though the wall will prevents him from reaching it. so my question is, is there any way to restrict the area where the pathfinding system work to the trapped area dynamically. and wich Graph Type is recommended to use in this situation or this kind of Games (Grid Graph/Navmesh Graph/Point Graph). Thank you. image link for explanation : https://dl.dropbox.com/u/77993668/exemple.jpg

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• how to mask Cocos2d

  - by alex

  Hi i'am iOS developer but i'm new to cocos2d.Im working on new game i use Kobold2d Have cocos2d installed too and i want to make this effect. http://postimage.org/image/ngj399ibn/ I Know how is done on flash, but cant make it in kobold. There 2 images with the same size one is like low-res image for background and the secon hi-res over the first one,when the "reticle" mask move reveal the second image inside the circle and outsite only the background is visible. I was googling with no success, saw some ray wenderlich projects but not helpful.Any help

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• Finding out which tile a mouse click landed in

  - by Shard

  I am working on an icometric grid based game and im having an issue trying to link a mouse click from the user to a tile. I have been able to split the problem into 2 parts which is first finding a rectangle that sourounds a tile, which I have been able to do but the second part of figuring out from the rectangle which tile the click landed in has got me stumped. Here is an example of a rectangle with tiles on the inside: The rectangle is 70px long and 30px high so if i use an input of say 30x(top)/20y(left) how would I go about determining which tile this fell into?

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• XNA 3D coordinates seem off

  - by Peteyslatts

  I'm going through a book, and the example it gave me seems like is should work, but when I try and implement it, it falls short. My Camera class takes three vectors in to generate View and Projection matrices. I'm giving it a position vector of (0,0,5), a target vector of Vector.Zero and a top vector (which way is up) of Vector.Up. My Three vertices are placed at (0,1,0), (-1,-1,0), (1,-1,0). It seems like it should work because the vertices are centered around the origin, and thats where I'm telling the camera to look but when I run the game, the only way to get the camera to see the vertices is to set its position to (0,0,-5) and even then the triangle is skewed. Not sure what's wrong here. Any suggestions would be helpful. Just to make sure I've given you guys everything (I don't think these are important as the problem seems to be related to the coordinates, not the ability of the game to draw them): I'm using a VertexBuffer and a BasicEffect. My render code is as follows: effect.World = Matrix.Identity; effect.View = camera.view; effect.Projection = camera.projection; effect.VertexColorEnabled = true; foreach (EffectPass pass in effect.CurrentTechnique.Passes) { pass.Apply(); GraphicsDevice.DrawUserPrimitives<VertexPositionColor> (PrimitiveType.TriangleStrip, verts, 0, 1); }

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• Using PhysX, how can I predict where I will need to generate procedural terrain collision shapes?

  - by Sion Sheevok

  In this situation, I have terrain height values I generate procedurally. For rendering, I use the camera's position to generate an appropriate sized height map. For collision, however, I need to have height fields generated in areas where objects may intersect. My current potential solution, which may be naive, is to iterate over all "awake" physics actors, use their bounds/extents and velocities to generate spheres in which they may reside after a physics update, then generate height values for ranges encompassing clustered groups of actors. Much of that data is likely already calculated by PhysX already, however. Is there some API, maybe a set of queries, even callbacks from the spatial system, that I could use to predict where terrain height values will be needed?

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• Can GJK be used with the same "direction finding method" every time?

  - by the_Seppi

  In my deliberations on GJK (after watching http://mollyrocket.com/849) I came up with the idea that it ins not neccessary to use different methods for getting the new direction in the doSimplex function. E.g. if the point A is closest to the origin, the video author uses the negative position vector AO as the direction in which the next point is searched. If an edge (with A as an endpoint) is closest, he creates a normal vector to this edge, lying in the plane the edge and AO form. If a face is the feature closest to the origin, he uses even another method (which I can't recite from memory right now) However, while thinking about the implementation of GJK in my current came, I noticed that the negative direction vector of the newest simplex point would always make a good direction vector. Of course, the next vertex found by the support function could form a simplex that less likely encases the origin, but I assume it would still work. Since I'm currently experiencing problems with my (yet unfinished) implementation, I wanted to ask whether this method of forming the direction vector is usable or not.

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• Doing imagemagick like stuff in Unity (using a mask to edit a texture)

  - by Codejoy

  There is this tutorial in imagemagick http://www.imagemagick.org/Usage/masking/#masks I was wondering if there was some way to mimic the behavior (like cutting the image up based on a black image mask that turns image parts transparent... ) and then trim that image in game... trying to hack around with the webcam feature and reproduce some of the imagemagick opencv stuff in it in Unity but I am saddly unequipped with masks, shaders etc in unity skill/knowledge. Not even sure where to start.

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• How to avoid movement speed stacking when multiple keys are pressed?

  - by eren_tetik

  I've started a new game which requires no mouse, thus leaving the movement up to the keyboard. I have tried to incorporate 8 directions; up, left, right, up-right and so on. However when I press more than one arrow key, the movement speed stacks (http://gfycat.com/CircularBewitchedBarebirdbat). How could I counteract this? Here is relevant part of my code: var speed : int = 5; function Update () { if(Input.GetKey(KeyCode.UpArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } else if(Input.GetKey(KeyCode.UpArrow) && Input.GetKey(KeyCode.RightArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } else if(Input.GetKey(KeyCode.UpArrow) && Input.GetKey(KeyCode.LeftArrow)){ transform.rotation = Quaternion.AngleAxis(315, Vector3.up); } if(Input.GetKey(KeyCode.DownArrow)){ transform.Translate(Vector3.forward * speed * Time.deltaTime); } }

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• How do I add a Rigid body and a box collider component to a Texture2D?

  - by gamenewdev

  I am making a snake game. I'm basing it on a basic tutorial game, which does no collision detection, wall checking or different levels. All snake head, piece, food, even the background is made of Texture2D. I want the head of the snake to detects 2D collisions with them, but Rect.contains isn't working. I'd prefer to detect collisions by onTriggerEnter() for which I need to add BoxCollider to my snakeHead.

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• How does having the Debugger change the game execution on an XBOX 360?

  - by Sebastian Gray

  So I thought my issue was relating to the difference between a Debug and a Release build as per this question: What's the difference between a "Release" Xbox 360 build and a "Debug" one? but I've since found that if I go ahead and build a Creators Club version of the game using a Debug build and deploy to the XBOX, I get the same experience I had with the Release version of my game. However if I run the game from Visual Studio using F5 and having set the XBOX as the default platform, then the game runs as expected. If I change from Debug to Release and run with CTRL+F5 then the game also works as expected. How would running the game with the debugger attached change the results I am getting in game? Is there any way that I can use the same approach or change the default compilation of the game so that I can use this approach to release my game?

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• XNA Spritebatch sorting by texture vs depth

  - by Motig

  I am refining my 2D game engine, and I want to look in to sorting sprite batches by texture (because I'm quite often using the same textures repeatedly). However, I also want to retain a few 'layers' of depth (i.e. ground < buildings < units < GUI etc). My question is, which of the following is the best approach (in terms of performance)? Create multiple SpriteBatches and Begin() and End() them in order; or... Create a single SpriteBatch and call Begin() and End() multiple times, once for each layer (in order)?

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• Handling hitboxes

  - by TheBroodian

  So I have an issue that I'm laughing at myself about, because it really seems like it should be something that I should be able to figure out pretty quickly. I am designing a 2D action platformer; I have a playable character, and a dummy 'punching bag' character for testing purposes that I've created. I've just gotten enough of both of them done that I can start prototyping and testing them in runtime. Then I realized- neither of them have references of each other (intentionally so), so how do I check for hitboxes stored within my playable character from my dummy character? Long story short, how do I make my dummy know when he's been punched by my hero?

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• How to setup my texture cordinates correctly in GLSL 150 and OpenGL 3.3?

  - by RubyKing

  I'm trying to do texture mapping in GLSL 150 and OpenGL 3.3 Here are my shaders I've tried my best to get this correct as possible hopefully this is :) I'm guessing you want to know what the problem is well my texture shows but not in its fullest form just one section of it not the full texture on the quad. All I can think of is its the texture cordinates in the main.cpp which is at the bottom of this post. FRAGMENT SHADER #version 150 in vec2 Texcoord_VSPS; out vec4 color; // Values that stay constant for the whole mesh. uniform sampler2D myTextureSampler; //Main Entry Point void main() { // Output color = color of the texture at the specified UV color = texture2D( myTextureSampler, Texcoord_VSPS ); } VERTEX SHADER #version 150 //Position Container in vec3 position; //Container for TexCoords attribute vec2 Texcoord0; out vec2 Texcoord_VSPS; //out vec2 ex_texcoord; //TO USE A DIFFERENT COORDINATE SYSTEM JUST MULTIPLY THE MATRIX YOU WANT //Main Entry Point void main() { //Translations and w Cordinates stuff gl_Position = vec4(position.xyz, 1.0); Texcoord_VSPS = Texcoord0; } LINK TO MAIN.CPP http://pastebin.com/t7Vg9L0k

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• Parsing glGetShaderInfoLog() to get error info. Is this reliable, or is there a better way?

  - by m4ttbush

  I want to get a list of errors and their line numbers so I can display the error information different to how it's formatted in the error string, and also show the line in error. It looks easy enough to just parse the result of glGetShaderInfoLog(), look for "ERROR:" then read the next number up to : and then the next, and then the error description up to the next newline. But the OpenGL docs say "Application developers should not expect different OpenGL implementations to produce identical information logs." Which makes me worry that my code may behave incorrectly on different systems. I don't need them to be identical, I just need them to follow the same format. So is there a better way to get a list of errors with line number separate, is it safe to assume that they'll always follow the "ERROR: 0:123:" format, or is there simply no reliable way to do this? Thanks!

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• How do you ensure consistent experience across multiple graphics cards (or even driver versions)?

  - by Grigory Javadyan

  So I was writing a simple 2D game with OpenGL and SDL and had this problem when there was awful tearing when running in windowed mode (even though I explicitly asked SDL_SetVideoMode to use double buffering). Didn't worry about it all too much because most of the time the game grabs the entire screen, windowed mode is just for debugging. Anyway, yesterday I updated my nVidia drivers and tearing disappeared, the game runs smooth and looks nice in windowed mode too. I can see how the problem may be in the graphics driver, but this leads to a question. Obviously, professional game developers have to deal with a lot of different hardware/software configurations. What are the techniques they use to make sure the game looks the roughly the same on different graphics cards or even the same model of graphics card, but with different driver versions?

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• When attaching AI to a vehicle should I define all steps or try Line of Sight?

  - by ThorDivDev

  This problem is related to an intersection simulation I am building for university. I will try to make it as general as possible. I am trying to assign AI to a vehicle using the JMonkeyEngine platform. AIGama_JmonkeyEngine explains that if you wish to create a car that follows a path you can define the path in steps. If there was no physics attached whatsoever then all you need to do is define the x,y,z values of where you want the object to appear in all subsequent steps. I am attaching the vehicleControl that implements jBullet. In this case the author mentions that I would need to define the steering and accelerating behaviors at each step. I was trying to use ghost controls that represented waypoints and when on colliding the car would decide what to do next like stopping at a red light. This didn't work so well. Car doesn't face right. public void update(float tpf) { Vector3f currentPos = aiVehicle.getPhysicsLocation(); Vector3f baseforwardVector = currentPos.clone(); Vector3f forwardVector; Vector3f subsVector; if (currentState == ObjectState.Running) { aiVehicle.accelerate(-800); } else if (currentState == ObjectState.Seeking) { baseforwardVector = baseforwardVector.normalize(); forwardVector = aiVehicle.getForwardVector(baseforwardVector); subsVector = pointToSeek.subtract(currentPos.clone()); System.out.printf("baseforwardVector: %f, %f, %f\n", baseforwardVector.x, baseforwardVector.y, baseforwardVector.z); System.out.printf("subsVector: %f, %f, %f\n", subsVector.x, subsVector.y, subsVector.z); System.out.printf("ForwardVector: %f, %f, %f\n", forwardVector.x, forwardVector.y, forwardVector.z); if (pointToSeek != null && pointToSeek.x + 3 >= currentPos.x && pointToSeek.x - 3 <= currentPos.x) { aiVehicle.steer(0.0f); aiVehicle.accelerate(-40); } else if (pointToSeek != null && pointToSeek.x > currentPos.x) { aiVehicle.steer(-0.5f); aiVehicle.accelerate(-40); } else if (pointToSeek != null && pointToSeek.x < currentPos.x) { aiVehicle.steer(0.5f); aiVehicle.accelerate(-40); } } else if (currentState == ObjectState.Stopped) { aiVehicle.accelerate(0); aiVehicle.brake(40); } }

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• How does your team handle support requests

  - by Skeep

  Hi All, I have just taken over as manager at a company and at the moment they are very rigid in how they approach development. Everyone gets a list of what they are doing each week. My question is how does your company balance support with development and if an important support request comes in how is this processed without disturbing the flow of the developers? Lastly, do you use an software log support requests and development tasks. Thanks

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• How to disguise a serverside mob as another?

  - by Shaun Wild

  I've been working a Minecraft sever mod and i want to be able to add a new entity to the server, but then make the server send the packets to the client, imitating another mob, for example.. Lets say say i have EntityPlayerNPC.class, what i want to do is have all of the packets that get sent to the client look like they are from that of another player which is on the player, therefore allowing me to add custom NPC's... Thinking about the theory i'm sure this can be done. I've tried looking around for where the packets are being sent from and whatnot, can anyone think up a solution? edit: i tried adding a new constructor to the Packet20NamedEntitySpawn class like so: public Packet20NamedEntitySpawn(String username, EntityLiving e){ this.entityId = 0; this.name = username; this.xPosition = MathHelper.floor_double(e.posX * 32.0D); this.yPosition = MathHelper.floor_double(e.posY * 32.0D); this.zPosition = MathHelper.floor_double(e.posZ * 32.0D); this.rotation = (byte)((int)(e.rotationYaw * 256.0F / 360.0F)); this.pitch = (byte)((int)(e.rotationPitch * 256.0F / 360.0F)); this.metadata = e.getDataWatcher(); } unfortunatley, that didn't work :(

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