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  • Can there be an Environment that Reacts to Weather changes in-game?

    - by The415
    Just to be straightforward, I am completely new to many aspects of coding and am searching for different specs and guidelines to aid me on my journey to crafting a wonderful game in Epic Games' Unreal Engine 4. I had some recent thoughts about the possibility of creating an environment in a game that interacts with weather (Rain, Snow, Storms) Is it possible to make an environment that can simulate weather changes in a game? I wrote notes on this for weeks now. I was thinking that an increase on environments occlusion maps was necessary for creating the effect of rain on windows, as well as making a flowing liquid surface on windows that is only visible in rain. I was also considering the idea of additive bump-maps on meshes for snow, to simulate accumulation. Are these elements dynamic in Unreal 4? Can I implement them?

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  • How do I put different textures on different walls? LWJGL

    - by lehermj
    So far I have it so you are running around in a box, but all of the walls are the same texture! I've loaded up other textures for the walls (I want the walls a different texture than the floor) but it seems as if its being ignored... Here's my code: int floorTexture = glGenTextures(); { InputStream in = null; try { in = new FileInputStream("floor.png"); PNGDecoder decoder = new PNGDecoder(in); ByteBuffer buffer = BufferUtils.createByteBuffer(4 * decoder.getWidth() * decoder.getHeight()); decoder.decode(buffer, decoder.getWidth() * 4, Format.RGBA); buffer.flip(); glBindTexture(GL_TEXTURE_2D, floorTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, decoder.getWidth(), decoder.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); glBindTexture(GL_TEXTURE_2D, floorTexture); } catch (FileNotFoundException ex) { System.err.println("Failed to find the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } catch (IOException ex) { System.err.println("Failed to load the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } int wallTexture = glGenTextures(); { InputStream in = null; try { in = new FileInputStream("walls.png"); PNGDecoder decoder = new PNGDecoder(in); ByteBuffer buffer = BufferUtils.createByteBuffer(4 * decoder.getWidth() * decoder.getHeight()); decoder.decode(buffer, decoder.getWidth() * 4, Format.RGBA); buffer.flip(); glBindTexture(GL_TEXTURE_2D, wallTexture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, decoder.getWidth(), decoder.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); glBindTexture(GL_TEXTURE_2D, wallTexture); } catch (FileNotFoundException ex) { System.err.println("Failed to find the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } catch (IOException ex) { System.err.println("Failed to load the texture files."); ex.printStackTrace(); Display.destroy(); System.exit(1); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } int ceilingDisplayList = glGenLists(1); glNewList(ceilingDisplayList, GL_COMPILE); glBegin(GL_QUADS); glTexCoord2f(0, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, ceilingHeight, gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, ceilingHeight, gridSize); glEnd(); glEndList(); int wallDisplayList = glGenLists(1); glNewList(wallDisplayList, GL_COMPILE); glBegin(GL_QUADS); // North wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); // West wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(-gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, floorHeight, +gridSize); // East wall glTexCoord2f(0, 0); glVertex3f(+gridSize, floorHeight, -gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(+gridSize, floorHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, -gridSize); // South wall glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(-gridSize, ceilingHeight, +gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(+gridSize, ceilingHeight, +gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(+gridSize, floorHeight, +gridSize); glEnd(); glEndList(); int floorDisplayList = glGenLists(1); glNewList(floorDisplayList, GL_COMPILE); glBegin(GL_QUADS); glTexCoord2f(0, 0); glVertex3f(-gridSize, floorHeight, -gridSize); glTexCoord2f(0, gridSize * 10 * tileSize); glVertex3f(-gridSize, floorHeight, gridSize); glTexCoord2f(gridSize * 10 * tileSize, gridSize * 10 * tileSize); glVertex3f(gridSize, floorHeight, gridSize); glTexCoord2f(gridSize * 10 * tileSize, 0); glVertex3f(gridSize, floorHeight, -gridSize); glEnd(); glEndList();

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  • When dealing with a static game board, what are some methods to make it more interesting?

    - by Ólafur Waage
    Let's say you have a game board that you look at. It does not move but there is some action going on. For example Chess, Checkers, Solitaire. The game I'm working on is not one of these but it's a good reference. What are some methods you can apply to the game or the design that increases the appeal of the game to the user? Of course you can make it prettier but what are some other methods you can use? For example: Visual cues, game design changes, user interface arrangement, etc.

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  • FPS camera specification

    - by user1095108
    I remember I once composed a FPS viewing transformation, as a composition of 3 rotations, each with an angle as a parameter. The first angle specified the left/right rotation around the y-axis, the second angle the up/down rotation around the x-axis, and the third around the z-axis. The viewing transformation was therefore specified by 3 angles. Naturally, this transformation had a gimbal lock, depending in what order the transformation were performed. What should I look at to derive my viewing transformation without the gimbal lock? I know the "lookAt" method already, but I consider that cumbersome. EDIT: MY first guess is to do the first 2 transformations to get a viewing direction and then the axis-angle rotation on this axis.

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  • How are vertex shader outs sent as inputs to the fragment shader?

    - by Jeffrey
    I'm learning some OpenGL 3.2 way of doing things and I think it's quite great, I'm actually understanding more of shaders and non-fixed pipeline in 1 week rather than those 2 years I tried to learn OpenGL fixed pipeline functions. But here's my question: From what I think I've understood the vertex shader is run for each vertexes in the VBO. But the fragments shader is run per each pixel (is that right?) which is a huge number compared to let's say 3 vertexes of a triangle. Now it seems that in the vertex shader the out variables (like colors and stuff) are passed 1 to 1 to the fragment shader. But let's say that I pass to the fragment shader the position of the vertex in the vertex shader. How is all executed? What vertex (A, B or C of the hipothetical triangle) is passed per each fragment and why?

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  • Moving an object using its velocity on a closed curve

    - by Futaro
    I want that an object follows a path, in Peggle game there are some pegs that have movement in a closed path. How can i get the same result? I guess that I can use parametric curve but I need use the velocity and not the position (x, y). I use NAPE and I have this in my gameloop: //circunference angle = angle + 1*(Math.PI / 180); movableBall.position.x = radius * Math.cos(angle)+ h; movableBall.position.y = radius * Math.sin(angle)+ k; it's works but I can not control the velocity, each movableBall must have its own velocity. Besides, from docs of NAPE:"Setting the position of a body is equivalent to simply teleporting the body; for instance moving a kinematic body by position is not the way to go about things.." I want to use: movableBall.velocity.x =?? movableBall.velocity.y = ?? The final idea is to follow others paths like the Lemniscate of Bernoulli. Thanks!

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  • How to prevent one account from unlocking products on other devices using Apple StoreKit?

    - by reapz
    We are currently wrapping up a free-to-play game on iOS in which you can purchase non-consumable products. We have been discussing this case internally and are not quite sure what the best practices are as this is our first title. For example, if a user downloads our app, and makes some purchases. These can be restored should the app ever be deleted and reinstalled as long as the user uses the same Apple ID. What is to stop him from making a fake Apple account, purchasing items and then posting this account on the web allowing everyone to get the items for free? That is obviously a worst case situation. But a smaller case would be a user unlocking items for his friends. We do not want this to be an always online game but have considered doing a check on startup if there is internet available. If the currently logged in account doesn't own the products do we lock them again? Probably not because people may simply sign into the device with different Game Center logins at which point we don't want to constantly lock and unlock items. At some point we will be adding multiplayer at which point we can definately do a check with the currently logged in account. This is because A, they will be online when attempting multiplayer, and B, they will want to use their own account for multiplayer. Unfortunately we aren't quite ready for this yet. Has anyone tackled this issue. Are we overthinking here?

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  • game engine done, ideas missing

    - by Thoms
    I read at many places how people have this GREAT ideas but are not able to program themselves. I have quite the opposite problem. I have developed game engine, level editor, embedded Lua scripting language, I have even made wrapper for Android and it all works well. But I have no good idea about how to proceed with actual levels; I have no good ideas. The engine itself is very generic and can be used in many game concepts, but I just cannot think of anything useful. Do you have any thoughts on how to proceed? Where should I seek ideas? Who should I ask? I am sorry if this question is a duplicate.

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  • b2Body moves without stopping

    - by SentineL
    I got a quite strange bug. It is difficult to explain it in two words, but i'll try to do this in short. My b2Body has restitution, friction, density, mass and collision group. I controlling my b2Body via setting linear velocity to it (called on every iteration): (void)moveToDirection:(CGPoint)direction onlyHorizontal:(BOOL)horizontal { b2Vec2 velocity = [controlledObject getBody]-GetLinearVelocity(); double horizontalSpeed = velocity.x + controlledObject.acceleration * direction.x; velocity.x = (float32) (abs((int) horizontalSpeed) < controlledObject.runSpeed ? horizontalSpeed : controlledObject.maxSpeed * direction.x); if (!horizontal) { velocity.y = velocity.y + controlledObject.runSpeed * direction.y; } [controlledObject getBody]->SetLinearVelocity(velocity); } My floor is static b2Body, it has as restitution, friction, density, mass and same collision group in some reason, I'm setting b2Body's friction of my Hero to zero when it is moving, and returning it to 1 when he stops. When I'm pushing run button, hero runs. when i'm releasing it, he stops. All of this works perfect. On jumping, I'm setting linear velocity to my Hero: (void)jump { b2Vec2 velocity = [controlledObject getBody]->GetLinearVelocity(); velocity.y = velocity.y + [[AppDel cfg] getHeroJumpVlelocity]; [controlledObject getBody]->SetLinearVelocity(velocity); } If I'll run, jump, and release run button, while he is in air, all will work fine. And here is my problem: If I'll run, jump, and continue running on landing (or when he goes from one static body to another: there is small fall, probably), Hero will start move, like he has no friction, but he has! I checked this via beakpoints: he has friction, but I can move left of right, and he will never stop, until i'll jump (or go from one static body to another), with unpressed running button. I allready tried: Set friction to body on every iteration double-check am I setting friction to right fixture. set Linear Damping to Hero: his move slows down on gugged moveing. A little more code: I have a sensor and body fixtures in my hero: (void) addBodyFixture { b2CircleShape dynamicBox; dynamicBox.m_radius = [[AppDel cfg] getHeroRadius]; b2FixtureDef bodyFixtureDef; bodyFixtureDef.shape = &dynamicBox; bodyFixtureDef.density = 1.0f; bodyFixtureDef.friction = [[AppDel cfg] getHeroFriction]; bodyFixtureDef.restitution = [[AppDel cfg] getHeroRestitution]; bodyFixtureDef.filter.categoryBits = 0x0001; bodyFixtureDef.filter.maskBits = 0x0001; bodyFixtureDef.filter.groupIndex = 0; bodyFixtureDef.userData = [NSNumber numberWithInt:FIXTURE_BODY]; [physicalBody addFixture:bodyFixtureDef]; } (void) addSensorFixture { b2CircleShape sensorBox; sensorBox.m_radius = [[AppDel cfg] getHeroRadius] * 0.95; sensorBox.m_p.Set(0, -[[AppDel cfg] getHeroRadius] / 10); b2FixtureDef sensor; sensor.shape = &sensorBox; sensor.filter.categoryBits = 0x0001; sensor.filter.maskBits = 0x0001; sensor.filter.groupIndex = 0; sensor.isSensor = YES; sensor.userData = [NSNumber numberWithInt:FIXTURE_SENSOR]; [physicalBody addFixture:sensor]; } Here I'm tracking is hero in air: void FixtureContactListener::BeginContact(b2Contact* contact) { // We need to copy out the data because the b2Contact passed in // is reused. Squirrel *squirrel = (Squirrel *)contact->GetFixtureB()->GetBody()->GetUserData(); if (squirrel) { [squirrel addContact]; } } void FixtureContactListener::EndContact(b2Contact* contact) { Squirrel *squirrel = (Squirrel *)contact->GetFixtureB()->GetBody()->GetUserData(); if (squirrel) { [squirrel removeContact]; } } here is Hero's logic on contacts: - (void) addContact { if (contactCount == 0) [self landing]; contactCount++; } - (void) removeContact { contactCount--; if (contactCount == 0) [self flying]; if (contactCount <0) contactCount = 0; } - (void)landing { inAir = NO; acceleration = [[AppDel cfg] getHeroRunAcceleration]; [sprite stopAllActions]; (running ? [sprite runAction:[self runAction]] : [sprite runAction:[self standAction]]); } - (void)flying { inAir = YES; acceleration = [[AppDel cfg] getHeroAirAcceleration]; [sprite stopAllActions]; [self flyAction]; } here is Hero's moving logic: - (void)stop { running = NO; if (!inAir) { [sprite stopAllActions]; [sprite runAction:[self standAction]]; } } - (void)left { [physicalBody setFriction:0]; if (!running && !inAir) { [sprite stopAllActions]; [sprite runAction:[self runAction]]; } running = YES; moveingDirection = NO; [bodyControls moveToDirection:CGPointMake(-1, 0) onlyHorizontal:YES]; } - (void)right { [physicalBody setFriction:0]; if (!running && !inAir) { [sprite stopAllActions]; [sprite runAction:[self runAction]]; } running = YES; moveingDirection = YES; [bodyControls moveToDirection:CGPointMake(1, 0) onlyHorizontal:YES]; } - (void)jump { if (!inAir) { [bodyControls jump]; } } and here is my update method (called on every iteration): - (void)update:(NSMutableDictionary *)buttons { if (!isDead) { [self updateWithButtonName:BUTTON_LEFT inButtons:buttons whenPressed:@selector(left) whenUnpressed:@selector(stop)]; [self updateWithButtonName:BUTTON_RIGHT inButtons:buttons whenPressed:@selector(right) whenUnpressed:@selector(stop)]; [self updateWithButtonName:BUTTON_UP inButtons:buttons whenPressed:@selector(jump) whenUnpressed:@selector(nothing)]; [self updateWithButtonName:BUTTON_DOWN inButtons:buttons whenPressed:@selector(nothing) whenUnpressed:@selector(nothing)]; [sprite setFlipX:(moveingDirection)]; } [self checkPosition]; if (!running) [physicalBody setFriction:[[AppDel cfg] getHeroFriction]]; else [physicalBody setFriction:0]; } - (void)updateWithButtonName:(NSString *)buttonName inButtons:(NSDictionary *)buttons whenPressed:(SEL)pressedSelector whenUnpressed:(SEL)unpressedSelector { NSNumber *buttonNumber = [buttons objectForKey:buttonName]; if (buttonNumber == nil) return; if ([buttonNumber boolValue]) [self performSelector:pressedSelector]; else [self performSelector:unpressedSelector]; } - (void)checkPosition { b2Body *body = [self getBody]; b2Vec2 position = body->GetPosition(); CGPoint inWorldPosition = [[AppDel cfg] worldMeterPointFromScreenPixel:CGPointMake(position.x * PTM_RATIO, position.y * PTM_RATIO)]; if (inWorldPosition.x < 0 || inWorldPosition.x > WORLD_WIDGH / PTM_RATIO || inWorldPosition.y <= 0) { [self kill]; } }

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  • Should I be using a game engine?

    - by Kyle
    I'm an experienced programmer, but I'm completely new to making games. I'm thinking of making an iPhone game that is similar to a 2d tower defense type game. In the web programming world, it would be a big waste of time to make a website without using some sort of web framework (eg ruby on rails). Is that the same for making games? Do people mostly use some sort of framework/game engine for making a game? If so, what are the popular ones for iOS?

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  • Good practices when optimizing HTML5/Javascript Game Developement [closed]

    - by hustlerinc
    I'm just starting out as a game developer and have created a few crappy but playable clones of classic games like pong, and bomberman. Being self taught (bless the internet) I do this by just stuffing in code to make the games work. Now I feel the time has come to create something complete, for this I need to know how a game is structured. I've searched on the web but there isn't that much to be found. The only "high-level" language I know is javascript so reading a tutorial or article based on C++ doesn't help me that much. I'm looking for good resource's pedagogically covering the theory and possibly examples (in Javascript or pseudo code that is understandable for a beginner) of how the game pieces fit together. From the start screen to asset loading and running the game loop. I'm not looking for anything complicated like reading through a 4000 line source code. All I want to learn is where, how and when the main parts of every game should be called. If you know any good resources to share, or maybe even have an answer for me I would deeply appreciate it.

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  • Animating sprites in HTML5 canvas

    - by fnx
    I'm creating a 2D platformer game with HTML5 canvas and javascript. I'm having a bit of a struggle with animations. Currently I animate by getting preloaded images from an array, and the code is really simple, in player.update() I call a function that does this: var animLength = this.animations[id].length; this.counter++; this.counter %= 3; if (this.counter == 2) this.spriteCounter++; this.spriteCounter %= animLength; return this.animations[id][this.spriteCounter]; There are a couple of problems with this one: When the player does 2 actions that require animating at the same time, animation speed doubles. Apparently this.counter++ is working twice at the same time. I imagine that if I start animating multiple sprites with this, the animation speed will multiply by the amount of sprites. Other issue is that I couldn't make the animation run only once instead of looping while key is held down. Someone told me that I should create a function Animation(animation id, isLooped boolean) and the use something like player.sprite = new Animation("explode", false) but I don't know how to make it work. Yes I'm a noob... :)

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  • BlockingCollection having issues with byte arrays

    - by MJLaukala
    I am having an issue where an object with a byte[20] is being passed into a BlockingCollection on one thread and another thread returning the object with a byte[0] using BlockingCollection.Take(). I think this is a threading issue but I do not know where or why this is happening considering that BlockingCollection is a concurrent collection. Sometimes on thread2, myclass2.mybytes equals byte[0]. Any information on how to fix this is greatly appreciated. MessageBuffer.cs public class MessageBuffer : BlockingCollection<Message> { } In the class that has Listener() and ReceivedMessageHandler(object messageProcessor) private MessageBuffer RecievedMessageBuffer; On Thread1 private void Listener() { while (this.IsListening) { try { Message message = Message.ReadMessage(this.Stream, this); if (message != null) { this.RecievedMessageBuffer.Add(message); } } catch (IOException ex) { if (!this.Client.Connected) { this.OnDisconnected(); } else { Logger.LogException(ex.ToString()); this.OnDisconnected(); } } catch (Exception ex) { Logger.LogException(ex.ToString()); this.OnDisconnected(); } } } Message.ReadMessage(NetworkStream stream, iTcpConnectClient client) public static Message ReadMessage(NetworkStream stream, iTcpConnectClient client) { int ClassType = -1; Message message = null; try { ClassType = stream.ReadByte(); if (ClassType == -1) { return null; } if (!Message.IDTOCLASS.ContainsKey((byte)ClassType)) { throw new IOException("Class type not found"); } message = Message.GetNewMessage((byte)ClassType); message.Client = client; message.ReadData(stream); if (message.Buffer.Length < message.MessageSize + Message.HeaderSize) { return null; } } catch (IOException ex) { Logger.LogException(ex.ToString()); throw ex; } catch (Exception ex) { Logger.LogException(ex.ToString()); //throw ex; } return message; } On Thread2 private void ReceivedMessageHandler(object messageProcessor) { if (messageProcessor != null) { while (this.IsListening) { Message message = this.RecievedMessageBuffer.Take(); message.Reconstruct(); message.HandleMessage(messageProcessor); } } else { while (this.IsListening) { Message message = this.RecievedMessageBuffer.Take(); message.Reconstruct(); message.HandleMessage(); } } } PlayerStateMessage.cs public class PlayerStateMessage : Message { public GameObject PlayerState; public override int MessageSize { get { return 12; } } public PlayerStateMessage() : base() { this.PlayerState = new GameObject(); } public PlayerStateMessage(GameObject playerState) { this.PlayerState = playerState; } public override void Reconstruct() { this.PlayerState.Poisiton = this.GetVector2FromBuffer(0); this.PlayerState.Rotation = this.GetFloatFromBuffer(8); base.Reconstruct(); } public override void Deconstruct() { this.CreateBuffer(); this.AddToBuffer(this.PlayerState.Poisiton, 0); this.AddToBuffer(this.PlayerState.Rotation, 8); base.Deconstruct(); } public override void HandleMessage(object messageProcessor) { ((MessageProcessor)messageProcessor).ProcessPlayerStateMessage(this); } } Message.GetVector2FromBuffer(int bufferlocation) This is where the exception is thrown because this.Buffer is byte[0] when it should be byte[20]. public Vector2 GetVector2FromBuffer(int bufferlocation) { return new Vector2( BitConverter.ToSingle(this.Buffer, Message.HeaderSize + bufferlocation), BitConverter.ToSingle(this.Buffer, Message.HeaderSize + bufferlocation + 4)); }

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  • Separating logic and data in browser game

    - by Tesserex
    I've been thinking this over for days and I'm still not sure what to do. I'm trying to refactor a combat system in PHP (...sorry.) Here's what exists so far: There are two (so far) types of entities that can participate in combat. Let's just call them players and NPCs. Their data is already written pretty well. When involved in combat, these entities are wrapped with another object in the DB called a Combatant, which gives them information about the particular fight. They can be involved in multiple combats at once. I'm trying to write the logic engine for combat by having combatants injected into it. I want to be able to mock everything for testing. In order to separate logic and data, I want to have two interfaces / base classes, one being ICombatantData and the other ICombatantLogic. The two implementers of data will be one for the real objects stored in the database, and the other for my mock objects. I'm now running into uncertainties with designing the logic side of things. I can have one implementer for each of players and NPCs, but then I have an issue. A combatant needs to be able to return the entity that it wraps. Should this getter method be part of logic or data? I feel strongly that it should be in data, because the logic part is used for executing combat, and won't be available if someone is just looking up information about an upcoming fight. But the data classes only separate mock from DB, not player from NPC. If I try having two child classes of the DB data implementer, one for each entity type, then how do I architect that while keeping my mocks in the loop? Do I need some third interface like IEntityProvider that I inject into the data classes? Also with some of the ideas I've been considering, I feel like I'll have to put checks in place to make sure you don't mismatch things, like making the logic for an NPC accidentally wrap the data for a player. Does that make any sense? Is that a situation that would even be possible if the architecture is correct, or would the right design prohibit that completely so I don't need to check for it? If someone could help me just layout a class diagram or something for this it would help me a lot. Thanks. edit Also useful to note, the mock data class doesn't really need the Entity, since I'll just be specifying all the parameters like combat stats directly instead. So maybe that will affect the correct design.

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  • Facing a character towards the mouse

    - by ratata
    I'm trying to port a simple 2d top down shooter game from C++(Allegro) to Java and i'm having problems with rotating my character. Here's the code i used in c++ if (keys[A]) RotateRight(player, degree); if (keys[D]) RotateLeft(player, degree); void RotateLeft(Player& player, float& degree) { degree += player.rotatingSpeed; if ( degree >= 360 ) degree = 0; } void RotateRight(Player& player, float& degree) { degree -= player.rotatingSpeed; if ( degree <= 0) degree = 360; } And this is what i have in render section: al_draw_rotated_bitmap(player.image, player.frameWidth / 2, player.frameHeight / 2, player.x, player.y, degree * 3.14159 / 180, 0); Instead of using A-D keys i want to use mouse this time. I've been searching since last night and came up to few sample codes however noone of them worked. For example this just made my character to circle around the map: int centerX = width / 2; int centerY = height / 2; double angle = Math.atan2(centerY - mouseY, centerX - mouseX) - Math.PI / 2; ((Graphics2D)g).rotate(angle, centerX, centerY); g.fillRect(...); // draw your rectangle Any help is much appreciated.

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  • XNA - Inconsistent accessibility: parameter type is less accessible than method

    - by DijkeMark
    I have a level class in which I make a new turret. I give the turret the level class as parameter. So far so good. Then in the Update function of the Turret I call a function Shoot(), which has that level parameter it got at the moment I created it. But from that moment it gives the following error: Inconsistent accessibility: parameter type 'Space_Game.Level' is less accessible than method 'Space_Game.GameObject.Shoot(Space_Game.Level, string)' All I know it has something to do with not thr right protection level or something like that. The level class: public Level(Game game, Viewport viewport) { _game = game; _viewport = viewport; _turret = new Turret(_game, "blue", this); _turret.SetPosition((_viewport.Width / 2).ToString(), (_viewport.Height / 2).ToString()); } The Turret Class: public Turret(Game game, String team, Level level) :base(game) { _team = team; _level = level; switch (_team) { case "blue": _texture = LoadResources._blue_turret.Texture; _rows = LoadResources._blue_turret.Rows; _columns = LoadResources._blue_turret.Columns; _maxFrameCounter = 10; break; default: break; } _frameCounter = 0; _currentFrame = 0; _currentFrameMultiplier = 1; } public override void Update() { base.Update(); SetRotation(); Shoot(_level, "turret"); } The Shoot Function (Which is in GameObject class. The Turret Class inherited the GameObject Class. (Am I saying that right?)): protected void Shoot(Level level, String type) { MouseState mouse = Mouse.GetState(); if (mouse.LeftButton == ButtonState.Pressed) { switch (_team) { case "blue": switch (type) { case "turret": TurretBullet _turretBullet = new TurretBullet(_game, _team); level.AddProjectile(_turretBullet); break; default: break; } break; default: break; } } } Thanks in Advance, Mark Dijkema

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  • Spherical harmonics lighting interpolation

    - by TravisG
    I want to use hardware filtering to smooth out colors in texels of a texture when I'm accessing texels at coordinates that are not directly at the center of the texel, the catch being that the texels store 2 bands of spherical harmonics coefficients (=4 coefficients), not RGBA intensity values. Can I just use hardware filtering like that (GL_LINEAR with and without mip mapping) without any considerations? In other terms: If I were to first convert the coefficients back to intensity representations, than manually interpolate between two intensities, would the resulting intensity be the same as if I interpolated between the coefficient vectors directly and then converted the interpolated result to intensities?

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  • Collision detection doesn't work for automated elements in XNA 4.0

    - by NDraskovic
    I have a really weird problem. I made a 3D simulator of an "assembly line" as a part of a college project. Among other things it needs to be able to detect when a box object passes in front of sensor. I tried to solve this by making a model of a laser and checking if the box collides with it. I had some problems with BoundingSpheres of models meshes so I simply create a BoundingSphere and place it in the same place as the model. I organized them into a list of BoundingSpheres called "spheres" and for each model I create one BoundingSphere. All models except the box are static, so the box object has its own BoundingSphere (not a member of the "spheres" list). I also implemented a picking algorithm that I use to start the movement. This is the code that checks for collision: if (spheres.Count != 0) { for (int i = 1; i < spheres.Count; i++) { if (spheres[i].Intersects(PickingRay) != null && Microsoft.Xna.Framework.Input.ButtonState.Pressed == Mouse.GetState().LeftButton) { start = true; break; } if (BoxSphere.Intersects(spheres[i]) && start) { MoveBox(0, false);//The MoveBox function receives the direction (0) and a bool value that dictates whether the box should move or not (false means stop) start = false; break; } if (start /*&& Microsoft.Xna.Framework.Input.ButtonState.Pressed == Mouse.GetState().LeftButton*/ && !BoxSphere.Intersects(spheres[i])) { MoveBox(0, true); break; } } The problem is this: When I use the mouse to move the box (the commented part in the third if condition) the collision works fine (I have another part of code that I removed to simplify my question - it calculates the "address" of the box, and by that number I know that the collision is correct). But when I comment it (like in this example) the box just passes trough the lasers and does not detect the collision (the idea is that the box stops at each laser and the user passes it forth by clicking on the appropriate "switch"). Can you see the problem? Please help, and if you need more informations I will try to give them. Thanks

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  • ERROR #342: DEVICE_SHADER_LINKAGE_SEMANTICNAME_NOT_FOUND

    - by Telanor
    I've stared at this for at least half an hour now and I cannot figure out what directx is complaining about. I know this error normally means you put float3 instead of a float4 or something like that, but I've checked over and over and as far as I can tell, everything matches. This is the full error message: D3D11: ERROR: ID3D11DeviceContext::DrawIndexed: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. The input stage requires Semantic/Index (COLOR,0) as input, but it is not provided by the output stage. [ EXECUTION ERROR #342: DEVICE_SHADER_LINKAGE_SEMANTICNAME_NOT_FOUND ] This is the vertex shader's input signature as seen in PIX: // Input signature: // // Name Index Mask Register SysValue Format Used // -------------------- ----- ------ -------- -------- ------ ------ // POSITION 0 xyz 0 NONE float xyz // NORMAL 0 xyz 1 NONE float // COLOR 0 xyzw 2 NONE float The HLSL structure looks like this: struct VertexShaderInput { float3 Position : POSITION0; float3 Normal : NORMAL0; float4 Color: COLOR0; }; The input layout, from PIX, is: The C# structure holding the data looks like this: [StructLayout(LayoutKind.Sequential)] public struct PositionColored { public static int SizeInBytes = Marshal.SizeOf(typeof(PositionColored)); public static InputElement[] InputElements = new[] { new InputElement("POSITION", 0, Format.R32G32B32_Float, 0), new InputElement("NORMAL", 0, Format.R32G32B32_Float, 0), new InputElement("COLOR", 0, Format.R32G32B32A32_Float, 0) }; Vector3 position; Vector3 normal; Vector4 color; #region Properties ... #endregion public PositionColored(Vector3 position, Vector3 normal, Vector4 color) { this.position = position; this.normal = normal; this.color = color; } public override string ToString() { StringBuilder sb = new StringBuilder(base.ToString()); sb.Append(" Position="); sb.Append(position); sb.Append(" Color="); sb.Append(Color); return sb.ToString(); } } SizeInBytes comes out to 40, which is correct (4*3 + 4*3 + 4*4 = 40). Can anyone find where the mistake is?

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  • Crash when using datablocks

    - by scorcher24
    I have really throughly searched the net and could not find any solution for this so I ask for help here. Anyway, I have this datablock in datablocks.cs: datablock t2dSceneObjectDatablock(EnemyShipConfig) { canSaveDynamicFields = "1"; Layer = "3"; size = "64 64"; CollisionActiveSend = "1"; CollisionActiveReceive = "1"; CollisionCallback = true; CollisionLayers = "3"; CollisionDetectionMode = "POLYGON"; CollisionPolyList = "0.00 -0.791 0.756 0.751 -0.746 0.732"; UsesPhysics = "0"; Rotation = "-90"; WorldLimitMode = "KILL"; WorldLimitMax = "880 360"; WorldLimitMin = "-765 -436"; minFireRate = "2000"; maxFireRate = "1200"; laserSpeed = "800"; minSpeed = "100"; maxSpeed = "150"; }; This is an exact reproduction of an object that I have manually edited in the editor. So far, I just used clone() to get as many enemies as I need, while it was out of sight. It is a r-type style shooter, so I need a variable amount of enemies. Since clone() spams my log, I decided to use datablocks, since it is also more flexible. That's what I get when I use clone(): Con::execute - 0 has no namespace: onRemoveFromScene However, once spawning begins, my game freezes and crashes: function SpawnEnemy() { //%spawnedEnemy = EnemyShipMaster.clone(true); %spawnedEnemy = new t2dStaticSprite() { class = "EnemyShip"; sceneGraph = $global_sceneGraph; datablock = "EnemyShipConfig"; imageMap = "starshipImageMap"; layer = 3; }; %speed = getRandom(%spawnedEnemy.minSpeed, %spawnedEnemy.maxSpeed); %y = getRandom(-320, 320); // Set Properties %spawnedEnemy.setPositionX(700); %spawnedEnemy.setPositionY(%y); %spawnedEnemy.setVisible(true); %spawnedEnemy.setLinearVelocityX( -%speed ); %spawnedEnemy.setTimerOn( getRandom( %spawnedEnemy.maxFireRate, %spawnedEnemy.minFireRate ) ); } // Definition of $global_sceneGraph from game.cs: $global_sceneGraph = sceneWindow2D.loadLevel(%level); As I said, it works fine when I use clone() (which is commented out here), but my log gets spammed. I really hope someone can shed some light for me, this is driving me crazy.

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  • Synchronise graphics and logic code

    - by Skeith
    I have a procedural approach to the game loop that runs various classes. it looks like this: continue any in progress animations check for used input apply AI move things resolve events such as collisions draw it all to screen I have seen a lot of posts about how drawing should be running separately as fast as it can, possibly in another thread. My problem is that if the drawing runs as fast as it, can what happens if it tried to draw while I'm still applying the AI or resolving a collision? It could draw the wrong thing on screen. This seems to be a well established idea so there must be an explanation to this problem as I just cant get my head around it. The only solution I have is to update the screen so fast that any errors like that get refreshed before we see them but that sounds hacky. So how does this work / how would you implement it so that they are in sync but running at different speeds?

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  • How to calculate direction from initial point and another point?

    - by Dvole
    I'm making a simple game where I shoot things from a certain point on screen (A). I tap the screen and shoot the projectile from initial point(A) to the tap point(B). But I want the projectile to move along the same path instead and fly out of bounds of the screen. How do I calculate a point that is on the same line that these two points, but further away? This is a simple math, but I can't figure it out.

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  • How do I multiply pixels on an SDL Surface?

    - by NoobScratcher
    Okay so I'm able to put blank pixels into a surface and also draw gradient pixels rectangles,etc But I don't know how to multiply the pixels on a surface so I was hoping someone could provide me information on this topic. I was thinking you could get the members pixel and then * it by 2 but that didn't provide results I wanted so I'm now thinking that you have to actually get to the position in bytes in one location to the left and one location to the right and then store it in memory and then * that by 2 am I correct or what? If so what is it that allows me to do that and how do I do that?

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  • XNA 4 game for both profiles

    - by Vodácek
    I am writing game in XNA 4 and this version have two profiles hi-def and reach. My problem is that I need to have my game code for each of these profiles and is very uncomfortable to have two projects and do all changes in both of them. My idea was to use preprocessor directive (i am not sure about name of this, http://msdn.microsoft.com/en-us/library/ed8yd1ha%28v=vs.71%29.aspx) and use IF statement at places with problems with profile. There is only problem that program needs to be compiled two times (for each profile) and manually changed directive and project settings to another profile. And my questions are: Is that good way? Is there better and cleaner way how to do this?

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  • Rotation, further I go from 0:0, the further the object positions around the origin while rotating

    - by Serguei Fedorov
    For some reason I am having the issue where the following code: global.spriteBatch.Draw(obj.sprite, obj.getPosition(), null, Color.White, obj.rotation, obj.center, 2f, SpriteEffects.None, 1); causes the object to rotate around the origin in such a way, as though there is an offset to the position relative to its location. The calculation for the center it correct and this happens even if I set the pivot to be the location of the object. The further I get from 0:0 the larger the radius or rotation. I am not sure what is going on here because given the following tutorial http://www.riemers.net/eng/Tutorials/XNA/Csharp/Series2D/Rotation.php I have done the code setup correctly. Any ideas? Any help is greatly appreciated!!!

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