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• using per pixel collision for an elastic response

  - by Codejoy

  I realize this might be open ended ended but curious if I just did some over kill... I had this http://create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel and i reworked it to work with my animation code in XNA and what not. It works well, but now I want to use this to decide if there was a collision and to have the items (characters) bounce off eachother elastically. Was the per pixel too much and I could of just used a bounding box ? (in fact would that of been preferred for what needs to be calculated in the response for an elastic collision?) Looking for guidance really.

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• How do I render from one render target to another?

  - by Chaotikmind

  I have two render targets: a fake backbuffer; a special render target where I do all my rendering. a light render target; where I render my light fx. I'm sure I'm rendering correctly on both. The problem arises when I overlay the light render target onto the fake backbuffer by drawing a quad covering it: DxEngine.DrawSprite(0.0f, 0.0f, 0.0f, (float)DxEngine.GetWidth(), (float)DxEngine.GetHeight(), 0xFFFFFFFF, LightSurface->GetTexture()); Regardless of what's in the light target, nothing is rendered onto the other target. I tried clearing the light target with full-white or full-black, but still get nothing. Fake backbuffer created with Direct3dDev->CreateTexture(Width, Height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &Texture, nullptr); Light render target created with Direct3dDev->CreateTexture(Width, Height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &Texture, nullptr); I also tried to create both with D3DFMT_A8R8G8B8, again without difference. Both targets have the same width and height. Only the fixed pipeline is used DirectX setup for rendering : Direct3dDev->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR ); Direct3dDev->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR ); Direct3dDev->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_NONE ); Direct3dDev->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_WRAP ); Direct3dDev->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_WRAP ); Direct3dDev->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE); Direct3dDev->SetRenderState(D3DRS_LIGHTING, false); Direct3dDev->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE); Direct3dDev->SetRenderState(D3DRS_ZWRITEENABLE,D3DZB_TRUE); Direct3dDev->SetRenderState(D3DRS_ZFUNC,D3DCMP_LESSEQUAL); Direct3dDev->SetRenderState(D3DRS_ALPHABLENDENABLE, true ); Direct3dDev->SetRenderState(D3DRS_ALPHAREF, 0x00000000ul); Direct3dDev->SetRenderState(D3DRS_ALPHATESTENABLE, true); Direct3dDev->SetRenderState(D3DRS_ALPHAFUNC,D3DCMP_GREATER); Direct3dDev->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA ); Direct3dDev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA ); Direct3dDev->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE); Direct3dDev->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE); Direct3dDev->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE); Direct3dDev->SetTextureStageState(0, D3DTSS_RESULTARG, D3DTA_CURRENT); Direct3dDev->SetTextureStageState(0, D3DTSS_TEXCOORDINDEX, D3DTSS_TCI_PASSTHRU); //ensure the first stage is not used for now Direct3dDev->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE); How can I do this right?

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• Implementing Explosions

  - by Xkynar

  I want to add explosions to my 2D game, but im having a hard time with the architecture. Several game elements might be responsible for explosions, like, lets say, explosive barrels and bullets (and there might be chain reactions with close barrels). The only options i can come up with are: 1 - Having an array of explosions and treat them as a game element as important as any other Pros: Having a single array which is updated and drawn with all the other game element arrays makes it more organized and simple to update, and the explosive barrels at a first glance would be easy to create, simply by passing the explosion array as a pointer to each explosive barrel constructor Cons: It might be hard for the bullets to add an explosion to the vector, since bullets are shot by a Weapon class which is located in every mob, so lets say, if i create a new enemy and add it to the enemy array, that enemy will have a weapon and functions to be able to use it, and if i want the weapon (rocket launcher in this case) to have access to the explosions array to be able to add a new one, id have to pass the explosion array as a pointer to the enemy, which would then pass it to the weapon, which would pass it to the bullets (ugly chain). Another problem I can think of is a little more weird: If im checking the collisions between explosions and barrels (so i create a chain reaction) and i detect an explosion colliding with a barrel, if i add a new explosion while im iterating the explosions java will trow an exception. So this is kinda annoying, i cant iterate through the explosions and add a new explosion, i must do it in another way... The other way which isnt really well thought yet is to just add an explosive component to every element that might explode so that when it dies, it explodes or something, but i dont have good ways on implementing this theory either Honestly i dont like either the solutions so id like to know how is it usually done by actual game developers, sorry if my problem seems trivial and dumb.

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• Where i set touch effect when a spawn Srite are comming on the screen?

  - by shihab_returns

  I just create a scene where create a spawn spirit that comes from above screen height in Landscape mode. Now i want to remove spirits when i touch on it. I tried but seems the code not works and crashed also after a while. here is my code: /** TimerHandler for collision detection and cleaning up */ IUpdateHandler detect = new IUpdateHandler() { @Override public void reset() { } @Override public void onUpdate(float pSecondsElapsed) { Iterator<AnimatedSprite> targets = targetLL.iterator(); AnimatedSprite _target; while (targets.hasNext()) { _target = targets.next(); if (_target.getY() >= cameraHeight) { // removeSprite(_target, targets); tPool.recyclePoolItem(_target); targets.remove(); Log.d("ok", "---------Looop Inside-----"); // fail(); break; } } targetLL.addAll(TargetsToBeAdded); TargetsToBeAdded.clear(); } }; /** adds a target at a random location and let it move along the y-axis */ public void addTarget() { Random rand = new Random(); int minX = mTargetTextureRegion.getWidth(); int maxX = (int) (mCamera.getWidth() - mTargetTextureRegion.getWidth()); int rangeX = maxX - minX; Log.d("----point----", "minX:" + minX + "maxX:" + maxX + "rangeX:" + rangeX); int rX = rand.nextInt(rangeX) + minX; int rY = (int) mCamera.getHeight() + mTargetTextureRegion.getHeight(); Log.d("---Random x----", "Random x" + rX + "Random y" + rY); target = tPool.obtainPoolItem(); target.setPosition(rX, rY); target.animate(100); mMainScene.attachChild(target, 1); mMainScene.registerTouchArea(target); int minDuration = 2; int maxDuration = 32; int rangeDuration = maxDuration - minDuration; int actualDuration = rand.nextInt(rangeDuration) + minDuration; // MoveXModifier mod = new MoveXModifier(actualDuration, target.getX(), // -target.getWidth()); MoveYModifier mody = new MoveYModifier(actualDuration, -target.getHeight(), cameraHeight + 10); target.registerEntityModifier(mody.deepCopy()); TargetsToBeAdded.add(target); } @Override public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final ITouchArea pTouchArea, final float pTouchAreaLocalX, final float pTouchAreaLocalY) { if (pTouchArea == target) { Toast.makeText(getApplicationContext(), "Yoooooooo", Toast.LENGTH_LONG).show(); } return true; } ** My question is where i implements IOnAreaTouchListener in My code. ? ** Thanks in Advance.

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• What kind of math should I be expecting in advanced programming?

  - by I_Question_Things_Deeply

  And I don't mean just space shooters and such, because in non-3D environments it's obvious that not much beyond elementary math is needed to implement. Most of the programming in 2D games is mostly going to involve basic arithmetic, algorithms for enemy AI and dimensional worlds, rotation, and maybe some Algebra as well depending on how you want to design. But I ask because I'm not really gifted with math at all. I get frustrated and worn out just by doing Pre-Algebra, so Algebra 2 and Calculus would likely be futile for me. I guess I'm not so "right-brained" when it comes down to pure numbers and math formulas, but the bad part is that I'm no art-expert either. What do you people here suppose I should do? Go along avoiding as much of the extremely difficult maths I can't fathom, or try to ease into more complex math as I excel at programming?

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• Will you still play a good Red Alert 3 mission map? [closed]

  - by W.N.

  I've been creating a RA3 mission map (play in Skirmish), most likely a remake of RA2 Yuri "To the Moon" mission, with more interesting elements. However, because of my work, the process was corrupted for more than a year. And now, I see that very few people still play RA3. So, should I continue making this map? Because there're still a lot of work to complete this map. I can assure you, the mission will be interesting. However, if few people play it, there's no need to waste time to it. Please give me some advice. Thank you.

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• How do I get a collision event from a KActor subclass?

  - by Almo

  I have a subclass of KActor, and I want an event when it collides with things. event RigidBodyCollision seems to be what I want according to this http://wiki.beyondunreal.com/UE3:Actor_events_%28UDK%29#RigidBodyCollision Called when a PrimitiveComponent this Actor owns has: -bNotifyRigidBodyCollision set to true -ScriptRigidBodyCollisionThreshold greater than 0 -it is involved in a physics collision where the relative velocity exceeds ScriptRigidBodyCollisionThreshold As far as I can tell, I have these set up, and the event is not called for any collisions (KActor-KActor, KActor-world geometry, etc). Is there something else I need to do?

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• EXC_BAD_ACCESS error when box2d joint is destroyed

  - by colilo

  When I destroy the weldJoint in the update method (see below) I get an EXC_BAD_ACCESS error pointing to the line world->DestroyJoint(weldJoint); in the update method below: -(void) update: (ccTime) dt { int32 velocityIterations = 8; int32 positionIterations = 1; // Instruct the world to perform a single step of simulation. It is // generally best to keep the time step and iterations fixed. world->Step(dt, velocityIterations, positionIterations); // using the iterator pos over the set std::set<BodyPair *>::iterator pos; for(pos = bodiesForJoints.begin(); pos != bodiesForJoints.end(); ++pos) { b2WeldJointDef weldJointDef; BodyPair *bodyPair = *pos; b2Body *bodyA = bodyPair->bodyA; b2Body *bodyB = bodyPair->bodyB; weldJointDef.Initialize(bodyA, bodyB, bodyA->GetWorldCenter()); weldJointDef.collideConnected = false; weldJoint = (b2WeldJoint*) world->CreateJoint(&weldJointDef); // Free the structure we allocated earlier. free(bodyPair); // Remove the entry from the set. bodiesForJoints.erase(pos); } for(b2Body *b = world->GetBodyList(); b; b=b->GetNext()) { if (b->GetUserData() != NULL) { CCSprite *mainSprite = (CCSprite*)b->GetUserData(); if (mainSprite.tag == 1) { mainSprite.position = CGPointMake( b->GetPosition().x * PTM_RATIO, b->GetPosition().y * PTM_RATIO); CGPoint mainSpritePosition = mainSprite.position; if (mainSprite.isMoved) { world->DestroyJoint(weldJoint); } } } } } In the HelloWorldLayer.h I set the weldJoint with the assign property. Am I destroying the joint in the wrong way? I would really appreciate any help. Thanks

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• How do you set the movement speed of a sprite?

  - by rphello101

  I'm using Slick 2D/Java to play around with graphics. Getting an image to move is easy: Input input = gc.getInput(); if(input.isKeyDown(sprite.up)){ sprite.y--; }else if (input.isKeyDown(sprite.down)){ sprite.y++; }else if (input.isKeyDown(sprite.left)){ sprite.x--; }else if (input.isKeyDown(sprite.right)){ sprite.x++; } However, this is called on every update, so if you hold up, the sprite moves to the edge of the screen in a few hundred milliseconds. Since coordinates are integers, I can't add less than 1 to slow the sprite down. I'm assuming I must have to implement a timer of some sort or something. Any advice?

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• Why doesn't MoveBy work in this example?

  - by ufo

  I'd like to run an action on a sprite using the MoveBy action. After lots of attempts, I can't achieve the goal... I have issues with the MoveBy in 2 different projects, so maybe I'm missing something in the setup... But I can't figure what! The instruction is like this: this.platform1Sprite.runAction(cc.MoveBy.create(1, cc.p(200, 0))); I don't get any error, simply it doesn't work. platform1Sprite is a Sprite. But even with a LabelTTF it doesn't work: var MoveToAction = cc.MoveTo.create(2.5, cc.p(size.width / 2, size.height / 2)); this.creditLabel.runAction(MoveToAction); For this last snippet, you can view my complete code here: http://pastebin.com/fGbW4LLH

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• Cocos2d: Using single timer/scheduler for multiple sprites

  - by Shailesh_ios

  want to know if is it possible to use single timer or scheduler method for multiple sprites ? Like I am now working on a game and there could be any number of sprites and i want to perform some actions on all of that sprites, So do I have to use as many timers or schedulers as sprites ? Or How can the job be done using only a single timer or scheduler ? What is I schedule a method and use it for, Say 10 sprites ? Will it affect the performance..?

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• How do I make a Java gave without a JFrame?

  - by kullalok

  I am working on an arcade-like game, and so far, I have been using JFrame. All the action occurs in the JFrame basically. However, I've noticed that a lot of games that you install on a computer don't have a frame. When you play them on Windows, the game covers the entire screen (the start bar disappears and you can't access any other application on your computer). I'd like to do that for my game. Is it possible to do so with Java? If so, how would I do this?

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• SDL beginner: create Rectangle surface filled with color

  - by user3689

  im learning SDL , i like to create Rectangle surface with color that is not image . here is my code that compiles fine but dosnt work : im passing the function this params: SDL_Surface* m_screen = SDL_SetVideoMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,SDL_SWSURFACE); SDL_FillRect(m_screen,&m_screen->clip_rect,SDL_MapRGB(m_screen->format,0xFF, 0xFF, 0xFF)); ... Button button(m_screen,0,0,50,50,255,0,0) ... ... Button::Button(SDL_Surface* screen,int x,int y,int w,int h,int R, int G, int B) { SDL_Rect box; SDL_Surface * ButtonSurface; ButtonSurface = NULL ; Uint32 rmask, gmask, bmask, amask; #if SDL_BYTEORDER == SDL_BIG_ENDIAN rmask = 0xff000000; gmask = 0x00ff0000; bmask = 0x0000ff00; amask = 0x000000ff; #else rmask = 0x000000ff; gmask = 0x0000ff00; bmask = 0x00ff0000; amask = 0xff000000; #endif box.x = x; box.y = y; box.w = w; box.h = h; ButtonSurface = SDL_CreateRGBSurface(SDL_SWSURFACE, box.w,box.h, 32, rmask, gmask, bmask, amask); if(ButtonSurface == NULL) { LOG_MSG("Button::Button Button failed"); } SDL_FillRect(screen,&box,SDL_MapRGB ( ButtonSurface->format, R, G, B )); //ut.ApplySurface(0,0,ButtonSurface,screen); SDL_BlitSurface(ButtonSurface,NULL,screen,&box); } what im doing here wrong ?

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• How to make an object fly out of a slingshot?

  - by Deza

  At the moment I'm improvising a slingshot, the user can click and drag the projectile and let go. The force on the object is calculated by getting the distance between the vector of the slingshots two forks and the vector between where the user pulled it. However this will always result in a positive number and will not take into account the angle of the object relative to that of the slingshot. How can I make it fly out of the slingshot correctly?

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• Fourth texture = segmentation fault

  - by Robin92

  I keep on getting segmentation fault each time I load fourth texture - what type of texture, I mean filename, does not matter. I checked value of GL_TEXTURES_STACK_SIZE which turned out to be 10 so quite more than 4, isn't it? Here're code fragments: funciton to load texture from png static GLuint gl_loadTexture(const char filename[]) { static int iTexNum = 1; GLuint texture = 0; img_s *img = NULL; img = img_loadPNG(filename); if (img) { glGenTextures(iTexNum++, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, img->iGlFormat, img->uiWidth, img->uiHeight, 0, img->iGlFormat, GL_UNSIGNED_BYTE, img->p_ubaData); img_free(img); //it may cause errors on windows } else printf("Error: loading texture '%s' failed!\n", filename); return texture; } actual loading static GLuint textures[4]; static void gl_init() { (...) //setting up OpenGL /* loading textures */ textures[0] = gl_loadTexture("images/background.png"); textures[1] = gl_loadTexture("images/spaceship.png"); textures[2] = gl_loadTexture("images/asteroid.png"); textures[3] = gl_loadTexture("images/asteroid2.png"); //this is causing SegFault no matter which file I load! } Any ideas? Problem is present on both Linux and Windows.

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• Where to generate data in an Entity-Component System?

  - by Mark Mandel

  So I'm making a small game where I generate 2D landscape using perlin noise when the game first loads. I've got it working in a OO way, but want to move over to an ES architecure, and I'm just struggling to work out the right place for the code that does the generation to go? In OO world, I have a World object which gets passes a coordinate value that is used as the seed for the perlin noise, and generates all the points for the land mass when the world is created. I'm thinking I need a World component with a coordinate field on it - that's an easy part. From there - is it right for a component to generate data when it's first initialised (or is that too OO?)? Or should a System be doing that instead, when the game first starts? Or... some other solution I'm not aware of? Thanks in advance for any guidance.

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• Team seeks collaboration for 2D action adventure RPG

  - by AlchemicTempest

  not entirely sure if it's appropriate to post this here, but I'll try: We are looking for all kinds of game dev interested people for our 2D sci-fi action adventure rpg "Quantum Nucleus" This is voluntary collaboration. We are seeking programmers(Java), artists, designers, audio people and writers So basically all kinds of people. Please watch our video, for further information: Video Link Thanks ! :D http://www.Alchemic-Tempest.com

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• How can I implement a matchmaker?

  - by csiz

  I'm making a multiplayer game, where players are separated in to rooms that would ideally have about 20 players. So I need a few pointers on an algorithm to distribute the players in to these rooms. A few more constraints: When a players gets in to a room, he should stay there until he decides to exit (the room itself changes levels) There may be more room servers, every server should create more rooms until near full capacity There's a central server that manages all the room servers, and directs the players towards their room

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• fast 3d point -> cuboid volume intersection test

  - by user1130477

  Im trying to test whether a point lies within a 3d volume defined by 8 points. I know I can use the plane equation to check that the signed distance is always -1 for all 6 sides, but does anyone know of a faster way or could point me to some code? Thanks EDIT: I should add that ideally the test would produce 3 linear interpolation parameters which would lie in the range 0..1 to indicate that the point is within the volume for each axis (since I will have to calculate these later if the point is found to be in the volume)

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• How can you store item data from a game?

  - by ThePlan

  When I look at games such as warcraft 3, or Diablo, or basically any games that contain items in them I notice that each item is unique. They all have different stats, different graphics, different names. I took a wild guess that they don't use XML, although I know I might be wrong, but I just figured they use something that isn't easily human-editable to prevent casual hacking. How is data such as item attributes stored in a game (2d or 3d, I suppose it works the same way in both)?

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• Are there any resources for motion-planning puzzle design?

  - by Salano Software

  Some background: I'm poking at a set of puzzles along the lines of Rush Hour/Sokoban/etc; for want of a better description, call them 'motion planning' puzzles - the player has to figure out the correct sequence of moves to achieve a particular configuration. (It's the sort of puzzle that's generically PSPACE-complete if that actually helps anyone's mental image). While I have a few straightforward 'building blocks' that I can use for puzzle crafting and I have a few basic examples put together, I'm trying to figure out how to avoid too much sameness over a large swath of these kinds of puzzles, and I'm also trying to figure out how to make puzzles that have more of a feel of logical solution than trial-and-error. Does anyone know of good resources out there for designing instances of this sort of puzzle once the core puzzle rules are in place? Most of what I've found on puzzle design only covers creating the puzzle rules, not building interesting puzzles out of a set of rules.

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• rigidbody2d.Addforce( ) behaves wieirdly unity 4.3 [on hold]

  - by Lilz Votca Love

  So guys ive edited the question and here is what my problem is i have a player which has a rigidbody2d attached to it.my player is able to doublejump in the air nicely and stick to walls when colliding with them and slowly slides to the ground.All movement is handle through physics and no transform manipulations.here i did something similar to this in the FixedUpdate of my player. void FixedUpdate() { if(wall && Input.GetButtonDown("Jump")) { if(facingright)//player is facing the left side of the wall { rigidbody2D.Addforce(new vector2(-1f,2f)*jumpforce); /*Now the player should jump backwards following this directional vector and should follow a smooth curve which in this part works well*/ } else { rigidbody2D.Addforce(new vector2(1f,2f)*jumpforce); /*Now this is where everything gets complicated as you should have noticed this is the same directional vector only the opposite x axis value and the same amount of force is used but it behaves like the red curve in the picture below*/ } } } bad behaviour and vector in red .I tested the same thing(both addforce methods) for a simple jump and they exactly behave like mentionned above in the picture.so here is my problem.Jumping diagonally forward with rigidbody2d.addforce() do not have the same impact,do not follow the same curve as jumping the opposite direction with the same exact amount of force.if i could fix this or get past this i could implement a walljump system like a ninja jumping in zigzag between two opposite wall to climb them.Any ideas or alternatives?

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• Is there a prohibition against scaling collision shapes at runtime?

  - by Almo

  So, I have a StaticMeshComponent attached to an Actor: Begin Object Class=StaticMeshComponent Name=StaticMeshComponentObject StaticMesh=StaticMesh'QF_Art_Powers.Mesh.GP_ForcePush' CollideActors=true BlockActors=false //Scale3D=(X=5, Y=1.5, Z=3) // ALMODEBUG End Object CollisionComponent=StaticMeshComponentObject Components.Add(StaticMeshComponentObject) Ordinarily, the actor gets spawned, anything touching it gets bumped, and the actor despawns itself. If I set the Scale3D as a default property, everything works as I expect. But I want to scale it at runtime, like this: function SetImpulseComponentTemplate(QuadForceBoxImpulseComponent Value) { Local Vector ScaleVec; ScaleVec.X = Value.Length; ScaleVec.Y = Value.Width; ScaleVec.Z = Value.Height; CollisionComponent.SetScale3D(ScaleVec); } When I do this, the thing only collides as if it were not scaled. If I leave the actor spawned so I can see it, it is scaled. If I also "show collision", the collision displays correctly as well. Is there a prohibition against scaling collision shapes at runtime?

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• Data model for unlockable card collection

  - by Karlos Zafra

  My game has a collection of cards (about 64) that are unlocked (one by one) provided that 4 items are collected/gained in the game. Right now the deck of cards is modeled with a plist file, like this: <plist> <dict> <key>card1</key> <dict> <key>available</key> <true/> <key>series</key> <integer>1</integer> <key>model</key> <integer>1</integer> <key>color</key> <integer>1</integer> </dict> <key>card2</key> <dict> <key>available</key> <false/> <key>series</key> <integer>1</integer> <key>model</key> <integer>1</integer> <key>color</key> <integer>2</integer> </dict> The value for the key named "available" marks if the item is locked or not. Right now I have to include the data for the items collected by the user, but including that inside the plist looks like too much hassle. What kind of structure should be more suitable for this? How do you manage a collection of unlockable items like this?

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• SDL blitting multiple surfaces at once

  - by extropic_engine

  I'm trying to write a platforming game where the sprites for the level backgrounds are broken up into 512x512 chunks. I keep 3 chunks in memory at a time and I'm trying to write code to blit all three to the screen. Here is the current code I have: SDL_Rect where; where.y = -game->camera->y; where.x = -game->camera->x - MAP_WIDTH; SDL_BlitSurface(left_chunk, NULL, screen, &where); where.x = -game->camera->x; SDL_BlitSurface(center_chunk, NULL, screen, &where); where.x = -game->camera->x + MAP_WIDTH; SDL_BlitSurface(right_chunk, NULL, screen, &where); The issue I'm running into is that whichever chunk gets blitted first is the only one that shows up. The rest fail to appear onscreen. I think the issue might have something to do with alpha transparency, but even if the chunks don't overlap at all they still fail to blit. In other parts of the code I'm blitting multiple things to the screen at once, such as characters and backgrounds, and they all show up correctly. This particular segment of code is the only area I'm encountering this problem. If I comment out the line that blits left_chunk, it changes to this:

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