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• Making a physicalized melee weapon

  - by xuincherguixe

  The short version, is that I was asked to look into the feasibility of making a melee weapon, that one could swing at another object in the game, and have it interact physically. I completed the tutorial here http://www.mavrikgames.com/tutorials/melee-weapons, and proved that indeed it is. The thing is, that only for a brief period in the swing is the sword capable of knocking things around. I've looked through the editor and code for awhile now, and I'm still not sure how to do this. I was able to lengthen the amount of time it takes the animations run for, but not the length of time with which the sword can bash the barrel around.

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• COCOS2D-html5 MoveBy doesn't work

  - 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. Thank you in advance.

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• How to add two textures ,one is used as background and another one is used in a rotating cube!

  - by VampirEMufasa

  I am working in OpenGL ES 2.0. Now I am writing a demo for my project, I load two png images as my textures with the libSOIL But now I need to use one of them as the texture of my demo's background and another one as the texture of a rotating cube. In OpenGL ES 2.0, the adding texture operation is in the shader But now I don't know how to add the different textures to the different place in a shader Who can help me! Thank you very much!

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• Driver inversion

  - by Val

  I have a GUI game, which is driven by user every time it clicks the mouse. Every time user clicks a square on a board, the board state is updated (we re-compute the score, the player to make next move and legal movements it can make) and repainted. Both mouse click, state recomputation and painting are handled in the GUI thread. Now, suppose that I want to train AI to play without GUI. That is, game engine should consume next move by simply calling AI's makeMove function in one thread. This would allow to play millions of games per second automatically. GUI may just screenshot some arbitrary states time after time. How do you switch to this strategy?

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• XNA 4.0 - container with content, that can slide (C#)

  - by DijkeMark

  I got an idea, but I got no idea on how to make it. Okay, so here is the deal. I want a container which can contain certain objects (These objects will draw the sprites/graphics). But because of different screen sizes, I want to be able to scale the containers width and height. But I do not want the objects in the container, that go outside of the container, because of the scaling to be visible. Because I want the objects all to be positioned horizontaly to eachother and I want a horizontal sliderbar, so I can slide from left to right within the container. I wonder if anyone could point me in the right direction. Thanks in Advance, Mark

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• Intuitive "Take Screenshot" key mapping used by games?

  - by Hatoru Hansou

  I recently had a problem testing my game on Linux Ubuntu. The Print key is intercepted by the desktop environment and It never reaches the game. Rather than fighting this, I will simply use any other key or key combination to trigger the screen capture functionality. Now, using the PRINT key is very intuitive because people already expect this behavior. What other keys are a good idea to use to take screenshots? And if possible elaborate why, have other apps/games used that key?

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• melonJS: Entity and solid block on collision layer

  - by Arthur Halma

  Actually I have my player entity with 64x64 sprite animation and 18x60 hitbox also the map is maded by 16x16 tiles. When my player goes some way he can pass through blocks (but not all of them). For example there are 4 situations: Good (player can't pass the tile with isSolid property on collision layer) Good (player can't pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Looks like melonJS checks only corners of hitbox instead of whole rectangle. Can anyone help me in this situation.

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• XNA 4.0: 2D Camera Y and X are going in wrong direction

  - by Setheron

  I asked this question on stackoverflow but assumed this might be a better area to ask it as well for a more informed answer. My problem is that I am trying to create a camera class and have it so that my camera follows the proper RHS, however the Y axis seems to be inverted since on the screen the 0 starts at the top. Here is my Camera2D Class: class Camera2D { private Vector2 _position; private float _zoom; private float _rotation; private float _cameraSpeed; private Viewport _viewport; private Matrix _viewMatrix; private Matrix _viewMatrixIverse; public static float MinZoom = float.Epsilon; public static float MaxZoom = float.MaxValue; public Camera2D(Viewport viewport) { _viewMatrix = Matrix.Identity; _viewport = viewport; _cameraSpeed = 4.0f; _zoom = 1.0f; _rotation = 0.0f; _position = Vector2.Zero; } public void Move(Vector2 amount) { _position += amount; } public void Zoom(float amount) { _zoom += amount; _zoom = MathHelper.Clamp(_zoom, MaxZoom, MinZoom); UpdateViewTransform(); } public Vector2 Position { get { return _position; } set { _position = value; UpdateViewTransform(); } } public Matrix ViewMatrix { get { return _viewMatrix; } } private void UpdateViewTransform() { Matrix proj = Matrix.CreateTranslation(new Vector3(_viewport.Width * 0.5f, _viewport.Height * 0.5f, 0)) * Matrix.CreateScale(new Vector3(1f, 1f, 1f)); _viewMatrix = Matrix.CreateRotationZ(_rotation) * Matrix.CreateScale(new Vector3(_zoom, _zoom, 1.0f)) * Matrix.CreateTranslation(_position.X, _position.Y, 0.0f); _viewMatrix = proj * _viewMatrix; } } I test it using SpriteBatch in the following way: protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); Vector2 position = new Vector2(0, 0); // TODO: Add your drawing code here spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, null, null, null, null, camera.ViewMatrix); Texture2D circle = CreateCircle(100); spriteBatch.Draw(circle, position, Color.Red); spriteBatch.End(); base.Draw(gameTime); }

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• Collision for mobile game

  - by zemiguel12

  I'm writing a little game in as3 using Starling, and I need to check collision between 2 boats that can rotate. I don't need the pixel perfect collision, but bounds collision is not enough too. The boat look more or less like this: I was thinking about create one square on the back of the boat and a triangle on the front, than for each boat, check if the square collide with the other boat square or triangle, and the same for the triangle. I just don't know how to do that, I don't know if it's possible with the Shape.hitTest, or if it's the best way to do that. What can I do?

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• Using bone joints

  - by raser

  I am trying to save bone joints to a file, and am using this format. I was wondering if anyone could clear up a few questions I have why do I need to provide rotation data for the bone, if I already gave it the location? How do I calculate the rotation of each axis if I have the relative location from the parent joint? ** EDIT ** After doing some more digging, I think that it has something to do with quaternions, so, could someone point me to a good resource on using quaternions for bone joints? ** EDIT AGAIN ** I think I've solved it, but I don't understand how it works. I can't seem to find any google results explaining it. I'd appreciate if anyone could send resources explaining it to me.

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• Getting velocity in only one plane (X) in Kismet (UDK)

  - by anna1987

  I'm trying to make a character in 2.5 platformer (in UDK) to "climb" a giant tree trunk by walking on a spiral staircase enveloped around the tree. When character goes right the tree rotates thru matinee sequence so it seems that the character is moving while in reality it is the tree that moves. I connected the matinee sequence playrate to the velocity of the character and its all good as long the character just moves left or right. When it jumps though, the velocity still affects the playrate - it should not as character moves up/down, not right/left. How do I set it up in Kismet so I get a float variable with velocity only in the X plane (horizontal)?

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• Moving sprite from one vector to the other

  - by user2002495

  I'm developing a game where enemy can shoot bullets towards the player. I'm using 2 vector that is normalized later to determine where the bullets will go. Here is the code where enemy shoots: private void UpdateCommonBullet(GameTime gt) { foreach (CommonEnemyBullet ceb in bulletList) { ceb.pos += ceb.direction * 1.5f * (float)gt.ElapsedGameTime.TotalSeconds; if (ceb.pos.Y >= 600) ceb.hasFired = false; } for (int i = 0; i < bulletList.Count; i++) { if (!bulletList[i].hasFired) { bulletList.RemoveAt(i); i--; } } } And here is where i get the direction (in the constructor of the bullet): direction = Global.currentPos - this.pos; direction.Normalize(); Global.currentPos is a Vector2 where currently player is located, and is updated eveytime the player moves. This all works fine except that the bullet won't go to player's location. Instead, it tends goes to the "far right" of the player's position. I think it might be the problem where the bullet (this.pos in the direction) is created (at the position of the enemy). But I found no solution of it, please help me.

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• Does anyone write games in Delphi?

  - by MDV2000

  I am a very seasoned Delphi developer (over 12 years of experience not counting my Turbo Pascal experience) and was wondering does anyone write games in Delphi? I have seen DirectX API wrappers in Delphi that allow you to program against DirectX (even wrote a simple solitaire game with a friend), but haven't seen anything out there that shows me that I should keep up with Delphi. I just hate to walk away from so much knowledge and Object Pascal language, but I am not seeing much as to a reason to keep going with Delphi. I currently program in C# and thinking about XNA, but it seems to me that the dominating opinion is go C/C++ route with DirectX. Any other Delphi developers out there struggle with this too? Thanks, MDV

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• Which optional features would you recommend for a raytracer? [closed]

  - by locks

  I'm developing a basic triangle mesh raytracer on a short deadline. This means I can't implement every feature I come across, so I'm looking for some feedback about which features you think are most important, taking into consideration the performance of the feature and how much punch it packs. I'm especially looking for optimization techniques that allow for a faster rendering and simple techniques that make a big impact on the final scene quality. Is there any chance of making it fast enough to run in realtime? Here are some example of features I've read about: Anti-aliasing Bounding box Sky box

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• Android / IPhone / Desktop C++ Game Template

  - by OriginalDaemon

  I was wondering if anyone has come across any articles detailing how to set up a basic game in C++ for use in Android / IPhone / Desktop applications. My thoughts just now are that I would like to make my game as a library and have a different project for each device which just interfaces with this library. You know the kind of thing, bootstrap the program, call some library initialize, load and run routines and occasionally pass some information to the library like input. I was hoping someone would have made a template for this kind of thing but I just had no luck finding one. It seems to me that it's the kind of thing you really only have to do once, so I was hoping someone would have done it for me already.

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• How to handle class dependency with interfaces and implementatons

  - by lealand

  I'm using ObjectAid with Eclipse to generate UML class diagrams for my latest Java project, and I currently have a handful of situations like this, where I have a dependency between two interfaces, as well as one of the implementations of one of the interfaces. Here, foo is the graphics library I'm using. In the previous example, FooCanvas draws ITexture objects to the screen, and both FooCanvas and its interface, ICanvas, take ITexture objects as arguments to their methods. The method in the canvas classes which cause this dependency is the following: void drawTexture(ITexture texture, float x, float y); Additionally, I tried a variation on the method signature using Java's generics: <T extends ITexture> void drawTexture(T texture, float x, float y); The result of this was a class diagram where the only dependencies where between the interfaces and the implementing classes, and no dependency by a canvas object on a texture. I'm not sure if this is more ideal or not. Is the dependency of both the interface and implementation on another interface an expected pattern, or is it typical and/or possible to keep the implementation 'isolated' from its interfaces dependencies? Or is the generic method the ideal solution?

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• Vector transform equation explanation

  - by cyberdemon

  I'm trying to understand the maths of moving points in a 3d space by making a game written in C#. I'm looking at this wolfire blog series which explains some basic 3d maths. I've read the first two parts but am stuck on the 3rd. I know it's all really rudimentary stuff but I find Googling for help with equations really hard. The one I'm struggling with is: 0*(0.66,0.75) + 2*(-0.75, 0.66) = (-1.5, 1.3) How can anything multiplied by 0 not be 0? So my question is how does this look in code: x(a,b) + y(c,d) I know it's basic stuff but I just can't see it.

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• Game programming and quantity of timers

  - by andresjb

  I've made a simple 2D game engine using C# and DirectX and it's fully functional for the demo I made to test it. I have a Timer object that uses QueryPerformanceCounter and I don't know what's the better choice: use only one timer in the game loop to update everything in the game, or an independent timer in every object that needs one. My worry is that when I try to implement threads, what will happen with timers? What happens with the sync?

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• Associate a texture to an object (from a data-model, not graphical point of view).

  - by Raveline

  I'm writing a roguelike where objects and floor can be made of different materials. For instance, let's say we can have a wooden chair, an iron chair, a golden chair, and so on. I've got an Object class (I know, the name is terrible), which is more or less using a composite pattern, and a Material class. Material have different important properties (noise, color...). For the time being, there are 5 different instances of materials, created at the initialization of the game. How would connect an instance of Object with one of the 5 instances of materials ? I see three simple solutions : Using a pointer. Simple and brutal. Using an integer material-id, then get the materials out of a table when engine manipulates the object for various purposes (display, attack analysis, etc.). Not very beautiful, I think, and not very flexible. Using an integer material-id, then get the materials out of a std::map. A bit more flexible, but still not perfect. Do you see other possibilities ? If not, what would you choose (and why) ? Thanks in advance !

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• Is it legal to develop a game usung some version of D&D, something similar to Baldurs Gate?

  - by Max

  For a while now I've been thinking about trying my hand at creating a game similar in spirit and execution to Baldurs Gate, Icewind Dale and offshoots. I'd rather not face the full bulk of work in implementing my own RPG system - I'd like to use D&D rules. Now, reading about the subject it seems there is something called "The License" which allows a company to brand a game as D&D. This license seems to be exclusive, and let's just say I don't have the money to buy it :p. Is it still legal for me to implement and release such a game? Commercially or open-source? I'm not sure exactly which edition would fit the best, but since Baldurs Gate is based of 2nd edition, could I go ahead an implement that? in short: what are the issues concerning licensing and publishing when it comes to D&D? Also: Didn't see any similar question...

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• How do I have an arrow follow different height parabolas depending on how long the player holds down a key?

  - by Moondustt

  i'm trying to throw an arrow in my game, but i'm having a hard time trying to realize how to make a good parabola. What I need: The more you hold "enter" stronger the arrow goes. The arrow angle will be always the same, 45 degrees. This is what I have already have: private float velocityHeld = 1f; protected override void Update(GameTime gameTime) { private void GetKeyboardEvent() { if (Keyboard.GetState().IsKeyDown(Keys.Enter) && !released) { timeHeld += velocityHeld; holding = true; } else { if (holding) { released = true; holding = false; lastTimeHeld = timeHeld; } } } if (released && timeHeld > 0) { float alpha = MathHelper.ToRadians(45f); double vy = timeHeld * Math.Sin(alpha); double vx = timeHeld * Math.Cos(alpha); ShadowPosition.Y -= (int)vy; ShadowPosition.X += (int)vx; timeHeld -= velocityHeld; } else { released = false; } } My question is, what do I need to do to make the arrow to go bottom as it loses velocity (timeHeld) to make a perfect parabola?

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• What is the proper way to use string::find to look for a word? [migrated]

  - by RubyKing

  How would I look through a string for a word rather then each character in that word. I have my code here and it always seems to find everything that is .obj even if its o or b or j or "." I checked the docuementation here but was unable to find an answer. Here is my code: string &str = *it; if(it->find(".obj")) { cout << "Found .Obj" << endl; } I also tried to use string::compare but that failed.

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• GL_INVALID_OPERATION in glEnd

  - by Killrazor

  Hello, I'm having problems drawing a simple sprite. When I draw: void CSprite2D::render() { CHECKGL(glLoadIdentity()); CHECKGL(glEnable(GL_TEXTURE_2D)); CHECKGL(glEnable(GL_BLEND)); CHECKGL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)); m_texture->bind(); //CHECKGL(glPushMatrix()); CHECKGL(glBegin(GL_TRIANGLE_STRIP)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s,m_textureAreaStart.t)); // 0,0 by default CHECKGL(glVertex3i(m_position.x,m_position.y,0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s,m_textureAreaStart.t)); // 1,0 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaEnd.s, m_textureAreaEnd.t)); // 1,1 by default CHECKGL(glVertex3i( m_position.x + m_dimensions.x, m_position.y + m_dimensions.y, 0)); CHECKGL(glNormal3i(0,0,1)); CHECKGL(glTexCoord2f(m_textureAreaStart.s, m_textureAreaEnd.t)); // 0,1 by default CHECKGL(glVertex3i( m_position.x, m_position.y + m_dimensions.y,0)); CHECKGL(glEnd()); //CHECKGL(glPopMatrix()); CHECKGL(glDisable(GL_BLEND)); } I'm always get an GL_INVALID_OPERATION in glEnd(). I suspect that error is not here, but I can't detect where may be. Actually, the output render seems ok. But I want to solve this situation before to catch a subtle bug tomorrow. Any idea of what could be

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• Orienting ship movement in asteroids [closed]

  - by BadSniper

  Possible Duplicate: Move sprite in the direction it is facing? I'm programming asteroids game. I'm trying to give velocity in the direction of ship face. I've tried using velocity.x = velocity.x * cos r, velocity.y = velocity.y * sin r where velocity is a vector and r is the angle rotated. but it's not moving in right direction. Could someone help with this problem? It is supposed to return the vector in which ship is facing. I don't understand the problem.

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• Should I amortize scripting cost via bytecode analysis or multithreading?

  - by user18983

  I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to give each agent a set amount of time and skip their turn if it elapses without an action being decided upon, but I would like people to be able to write their agents decision functions without having to think too much about how long its taking unless they really want to. The two approaches I'm considering are giving each agent a set number of bytecode instructions (taking cost into account) each timestep, and making players deal with the consequences of the game state changing between blocks of computation (as with Battlecode) or giving each agent it's own thread and giving each thread equal time on the processor. I'm about equally knowledgeable on both concurrency and bytecode stuff, which is to say not very, so I'm wondering which approach would be best. I have a clearer idea of how I'd structure things if I used bytecode, but less certainty about how to actually implement the analysis. I'm pretty sure I can work up a concurrency based system without much trouble, but I worry it will be messier with more overhead and will add unnecessary complexity to the project.

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