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• How to move an object along a circumference of another object?

  - by Lumis

  I am so out of math that it hurts, but for some of you this should be a piece of cake. I want to move an object around another along its ages or circumference on a simple circular path. At the moment my game algorithm knows how to move and position a sprite just at the edge of an obstacle and now it waits for the next point to move depending on various conditions. So the mathematical problem here is how to get (aX, aY) and (bX, bY) positions, when I know the Centre (cX, cY), the object position (oX, oY) and the distance required to move (d)

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• Any way to edit Warcraft MDX or MDL Animated models?

  - by Aralox

  I have been searching for a while for a way to get an animated mdl or mdx model into any 3D animating software (such as Blender), but so far have not had any success. I found a few methods of getting textured static mdx or mdl models into Blender/Milkshape/Hexagon, but no one seems to have written an importer that deals with the mdl/mdx model's keyframe animation. On that note, if anyone knows of a way of importing a keyframe-animated 3DS model into Blender, me and alot of people would appreciate it if you could let us know. Thanks for any help! :) PS: For anyone curious about static MDL or MDX - Blender, see here: http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/WarCraft_MDL

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• Collision with half of a semi-circle

  - by heitortsergent

  I am trying to port a game I made using Flash/AS3, to the Windows Phone using C#/XNA 4.0. You can see it here: http://goo.gl/gzFiE In the flash version I used a pixel-perfect collision between meteors (it's a rectangle, and usually rotated) that spawn outside the screen, and move towards the center, and a shield in the center of the screen(which is half of a semi-circle, also rotated by the player), which made the meteor bounce back in the opposite direction it came from, when they collided. My goal now is to make the meteors bounce in different angles, depending on the position it collides with the shield (much like Pong, hitting the borders causes a change in the ball's angle). So, these are the 3 options I thought of: Pixel-perfect collision (Microsoft has a sample) , but then I wouldn't know how to change the meteor angle after the collision 3 BoundingCircle's to represent the half semi-circle shield, but then I would have to somehow move them as I rotate the shield. Farseer Physics. I could make a shape composed of 3 lines, and use that as the collision object for the shield. Is there any other way besides those? Which would be the best way to do it(it's aimed towards mobile devices, so pixel-perfect is probably not a good choice)? Most of the time there's always a easier/better way than what we think of...

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• Bending of track in a racing game

  - by caius

  I am trying to create a small racing game in which the track would be modeled using a BSpline curve for the path's center line and directional vectors to define the 'bending' of the track at each point. My problem is that I don't know how to calculate the correct bending / slope of the curve, in such a way that it would be optimal or at least visually nice for a car to 'bend in the corner'. My idea was to use the direction of the 2nd derivatives of the curve, however while this approach looks fine for most of the track, there are points in which the 2nd derivative makes sharp 'twists' / very quick 180 degree flips. I also read about 'knots' of bsplines, but I don't know if such 'twist' in 2nd derivatives is a knot or knots are something else. Can you tell me that using a BSpline: 1. How could I calculate a visually nice bending of a track for a racing game? 2. Is it possible to do this by using some simple calculations of centripertal force / gravity? 3. Is it possible to do this by using 1st, 2nd and 3rd derivatives of the BSpline curve? I am not looking for the 'physically correct' bending angle for the track, I would just like to create something which is visually pleasing in a simple game. I am using a framework which has a built-in class for BSpline, including support for 1st, 2nd and 3rd derivatives of the curve.

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• What are some ways to separate game logic from animations and the draw loop?

  - by TMV

  I have only previously made flash games, using MovieClips and such to separate out my animations from my game logic. Now I am getting into trying my hand at making a game for Android, but the game programming theory around separating these things still confuses me. I come from a background of developing non game web applications so I am versed in more MVC like patterns and am stuck in that mindset as I approach game programming. I want to do things like abstract my game by having, for example, a game board class that contains the data for a grid of tiles with instances of a tile class that each contain properties. I can give my draw loop access to this and have it draw the game board based on the properties of each tile on the game board, but I don't understand where exactly animation should go. As far as I can tell, animation sort of sits between the abstracted game logic (model) and the draw loop (view). With my MVC mindset, it's frustrating trying to decide where animation is actually supposed to go. It would have quite a bit of data associated with it like a model, but seemingly needs to be very closely coupled with the draw loop in order to have things like frame independent animation. How can I break out of this mindset and start thinking about patterns that make more sense for games?

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• how to organize rendering

  - by Irbis

  I use a deferred rendering. During g-buffer stage my rendering loop for a sponza model (obj format) looks like this: int i = 0; int sum = 0; map<string, mtlItem *>::const_iterator itrEnd = mtl.getIteratorEnd(); for(map<string, mtlItem *>::const_iterator itr = mtl.getIteratorBegin(); itr != itrEnd; ++itr) { glActiveTexture(GL_TEXTURE0 + 0); glBindTexture(GL_TEXTURE_2D, itr->second->map_KdId); glDrawElements(GL_TRIANGLES, indicesCount[i], GL_UNSIGNED_INT, (GLvoid*)(sum * 4)); sum += indicesCount[i]; ++i; glBindTexture(GL_TEXTURE_2D, 0); } I sorted faces based on materials. I switch only a diffuse texture but I can place there more material properties. Is it a good approach ? I also wonder how to handle a different kind of materials, for example: some material use a normal map, other doesn't use. Should I have a different shaders for them ?

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• DirectX 9.0c and C++ GUI

  - by SullY

  Well, I'm trying to code a gui for my engine, but I've got some problems. I know how to make a UI overlay but buttons are still black magic for me. Anything I tried was to compilcated ( if it goes big ). To Example I tried to look if the mouse position is the same as the Pixel that is showing the button. But If I use some bigger areas it's getting to complicated. Now I'm searching for a Tutorial how to implement your own gui. I'm really confused about it. Well I hope you have/ know some good tutorials. By the way, I took a look at the DXUTSample, but it's to big to get overview.

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• Abstract skill/talent system implementation

  - by kiliki

  I've been making small 2D games for about 3 years now (XNA and more recently LWJGL/Slick2D). My latest idea would involve some form of "talent tree" system in a real time game. I've been wracking my brain but can't think of a structure to hold a talent. Something like "Your melee attack is an instant kill if behind the target" I'd like to come up with an abstract object rather than putting random conditionals into other methods. I've solved some relatively complex problems before but I don't even know where to begin with this one. Any help would be appreciated - Java, pseudocode or general concepts are all great.

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• Point line collision reaction

  - by user4523

  I am trying to program point line segment collision detection and reaction. I am doing this for fun and to learn. The point moves (it has a velocity, and can be controlled by the user), whilst the lines are strait and stationary. The lines are not axis aligned. Everything is in 2D. It is quite straight forward to work out if a collision has occurred. For each frame, the point moves from A to B. AB is a line, and if it crosses the line segment, a collision has occurred (or will occur) and I am able to work out the point of intersection (poi). The problem I am having is with the reaction. Ideally I would like the point to be prevented from moving across the line. In one frame, I can move the point back to the poi (or only alow it to move as far as the poi), and alter the velocity. The problem I am having with this approach (I think) is that, next frame the user may try to cross the line again. Although the point is on the poi, the point may not be exactly on the line. Since it is not axis aligned, I think there is always some subtle rounding issue (A float representation of a point on a line might be rounded to a point that is slightly on one side or the other). Because of this, next frame the path might not intersect the line (because it can start on the other side and move away from it) and the point is effectively allowed to cross the line. Firstly, does the analysis sound correct? Having accepted (maybe) that I cannot always exactly position the point on the line, I tried to move the point away from the line slightly (either along the normal to the line, or along the path vector). I then get a problem at edges. Attempting to fix one collision by moving the point away from the line (even slightly) can cause it to cross another line (one shape I am dealing with is a star, with sharp corners). This can mean that the solution to one collision inadvertently creates another collision, which is ignored. Again, does this sound correct? Anyway, whatever I try, I am having difficulty with edges, and the point is occasionally able to penetrate the polygons and cross lines, which is undesirable. Whilst I can find a lot of information about collision detection on the web (and on this site) I can find precious little information on collision reaction. Does any one know of any good point line collision reaction tutorials? Or is my approach too flawed/over complicated?

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• why specular light is not running?

  - by nkint

  hi, i'm on JOGL this is my method for lighting: private void lights(GL gl) { float[] LightPos = {0.0f, 0.0f, -1.0f, 1.0f}; float[] LightAmb = {0.2f, 0.2f, 0.2f, 1.0f}; float[] LightDif = {0.6f, 0.6f, 0.6f, 1.0f}; float[] LightSpc = {0.9f, 0.9f, 0.9f, 1.0f}; gl.glLightfv(GL.GL_LIGHT1, GL.GL_POSITION, LightPos, 0); gl.glLightfv(GL.GL_LIGHT1, GL.GL_AMBIENT, LightAmb, 0); gl.glLightfv(GL.GL_LIGHT1, GL.GL_DIFFUSE, LightDif, 0); gl.glLightfv(GL.GL_LIGHT1, GL.GL_SPECULAR, LightSpc, 0); gl.glLightfv(GL.GL_LIGHT0, GL.GL_SPECULAR, LightSpc, 0); gl.glEnable(GL.GL_LIGHT0); gl.glEnable(GL.GL_LIGHT1); gl.glShadeModel(GL.GL_SMOOTH); gl.glEnable(GL.GL_LIGHTING); } and i see my objects flat, no specular light.. any ideas? ps. to render my objects: gl.glColor3f(1f,0f,0f); gl.glBegin(GL.GL_TRIANGLES); for(Triangle t : tubeModel.getTriangles()) { gl.glVertex3f(t.v1.x, t.v1.y, t.v1.z); gl.glVertex3f(t.v2.x, t.v2.y, t.v2.z); gl.glVertex3f(t.v3.x, t.v3.y, t.v3.z); } gl.glEnd();

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• Speed up content loading

  - by user1806687

  I am using WinForms Sample downloaded from microsoft website. The problem is, that the model loading time is quite long, using: contentBuilder.Add(ModelPath, ModelName, null, "ModelProcessor"); contentManager.Load<Model>(ModelName); even a simple model, such as a cube with no textures, takes 4+ seconds to load. Now, I am no expert on this, but is there anyway to decrease loading time? EDIT: I've gone thru the code and found out that calling contentBuilder.Build(); ,which comes right after contentBuilder.Add() method takes up most of the time.

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• Operations on multiple overlapping layers not working

  - by Arun

  Hi I am developing a game in android just like Farmville by Zinga. In that game we have to place elements in the diamond shaped field so the don't overlap each other. Now I did coding for placing the field inside the farm field but I cannot stop the problem of overlapping of the farm field. I Am attaching the code that I have down for all this someone please help me.... try{ if(bm1.getPixel((int)initX,(int)initY)!=0){ if(bm1.getPixel((int)initX,(int)initY+20)!=0){ if(bm1.getPixel((int)initX-20,(int)initY)!=0){ if(bm1.getPixel((int)initX+20,(int)initY)!=0){ if(bm1.getPixel((int)initX,(int)initY-20)!=0){ c.drawBitmap(bm,initX-30,initY-20, paint); } } } } } }catch(Exception e) { Toast.makeText(getContext(), e.toString(), Toast.LENGTH_SHORT); }

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• Smooth drag scrolling of an Isometric map - Html5

  - by user881920

  I have implemented a basic Isometric tile engine that can be explored by dragging the map with the mouse. Please see the fiddle below and drag away: http://jsfiddle.net/kHydg/14/ The code broken down is (CoffeeScript): The draw function draw = -> requestAnimFrame draw canvas.width = canvas.width for row in [0..width] for col in [0..height] xpos = (row - col) * tileHeight + width xpos += (canvas.width / 2) - (tileWidth / 2) + scrollPosition.x ypos = (row + col) * (tileHeight / 2) + height + scrollPosition.y context.drawImage(defaultTile, Math.round(xpos), Math.round(ypos), tileWidth, tileHeight) Mouse drag-scrolling control scrollPosition = x: 0 y: 0 dragHelper = active: false x: 0 y: 0 window.addEventListener 'mousedown', (e) => handleMouseDown(e) , false window.addEventListener 'mousemove', (e) => handleDrag(e) , false window.addEventListener 'mouseup', (e) => handleMouseUp(e) , false handleDrag = (e) => e.preventDefault() if dragHelper.active x = e.clientX y = e.clientY scrollPosition.x -= Math.round((dragHelper.x - x) / 28) scrollPosition.y -= Math.round((dragHelper.y - y) / 28) handleMouseUp = (e) => e.preventDefault() dragHelper.active = false handleMouseDown = (e) => e.preventDefault() x = e.clientX y = e.clientY dragHelper.active = true dragHelper.x = x dragHelper.y = y The Problem As you can see from the fiddle the dragging action is ok but not perfect. How would I change the code to make the dragging action more smooth? What I would like is the point of the map you click on to stay under the mouse point whilst you drag; the same as they have done here: http://craftyjs.com/demos/isometric/

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• Managing many draw calls for dynamic objects

  - by codetiger

  We are developing a game (cross-platform) using Irrlicht. The game has many (around 200 - 500) dynamic objects flying around during the game. Most of these objects are static mesh and build from 20 - 50 unique Meshes. We created seperate scenenodes for each object and referring its mesh instance. But the output was very much unexpected. Menu screen: (150 tris - Just to show you the full speed rendering performance of 2 test computers) a) NVidia Quadro FX 3800 with 1GB: 1600 FPS DirectX and 2600 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 260 FPS in OpenGL Now inside the game in a test level: (160 dynamic objects counting around 10K tris): a) NVidia Quadro FX 3800 with 1GB: 45 FPS DirectX and 50 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 45 FPS in OpenGL Obviously we don't have the option of mesh batch rendering as most of the objects are dynamic. And the one big static terrain is already in single mesh buffer. To add more information, we use one 2048 png for texture for most of the dynamic objects. And our collision detection hardly and other calculations hardly make any impact on FPS. So we understood its the draw calls we make that eats up all FPS. Is there a way we can optimize the rendering, or are we missing something?

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• how to use string::find to look for a word rather each character seperately

  - by RubyKing

  Hello 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 "." is there anyway to get passed this here is my code? I checked the docuementation here link but nothing returned any results I craved so hard 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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• Drawing flaming letters in 3d on OpenGL ES 2.0

  - by Chiquis

  I am a bit confused about how to achieve this. What i want is to "draw with flames". I have achieved this with textures successfully, but now my concern is about doing this with particles to achieve the flaming effect. Am I supposed to have a Path in where i should add many particle emitters along the path that will "be emitting flames"? I understand the concept for 2d, but for 3d are the particles (that are quads) always supposed to be facing the user? Edit: Something else im worried about is the performance hit that will occur by having that many particle emitters, because there can be many letters and drawings at the same time. And each of these elements will have many particle emitters.

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• How to make image bigger than the screen to be slideable in the screen in monogame for windows phone 8?

  - by Moses Aprico

  (Idk if my title is correct, because when I google it, there is no related result I guess) I am not sure how to explain it correctly, but I am making a plain 2D, tile based, tactic game in windows phone 8 using monogame. I want to make my map is "slideable". With "slidable" I mean I can draw larger images (in total) than my screen and then slide it so I can view a certain area of the drawn images Example : I have a screen which dimension is 1280x720. I have a 1500x1500px image, which consists of 15 tiles, which is 100x100px each, which each tiles is redrawn each times the "Draw" is called. If the image is larger than the screen, the displayed area will be trimmed and of course, making a 220x780px area that is unseenable. The only way to see all of it is through "sliding" the screen around, so I can see all the area. My question is : How to make that happen? Because in default, the screen is unslideable and the image remains trimmed. Sorry if my question and explanation is not clear enough. Clarify it as much as you like. Thank you.

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• Set Position of multiple bodies

  - by philipp

  I have a character composed of five bodies which are tied together by a lot of joints. On of them is the overall chassis, to which all forces and impulses are applied to move the whole Character. All in all that works very fine, except one thing: I need to set the Position of the Character so that it get Beamed from one place to the other in one single frame. Unfortunately I cannot get this to work. I tried the following code, without any success… playerbodies.forEach(function (bd) { bd.SetLinearVelocity(new b2.Vec2()); var t = bd.GetTransform(); t.p.x -= 10; bd.SetTransform(t, bd.GetAngle()); }); How can I make that happen?

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• How can I create an orthographic display that handles different screen dimensions?

  - by Piku

  I'm trying to create an iPad/iPhone game using GLES2.0 that contains a 3D scene with a heads-up-display/GUI overlaid on the top. However, this problem would also apply if I were to port my game to a computer and run the game in a resizable window, or allow the user to change screen resolutions... When trying to make the 2D GUI/HUD work I've made the assumption that all I'm really doing is drawing a load of 2D textured 'quads' on the screen and am trying to treat the orthographic projection as an old-style 2D display with 0,0 in the upper left and screenWidth,ScreenHeight in the lower right. This causes me all sorts of confusion when I rotate my ipad into Landscape mode since I can't work out what to put into my projection and modelview matrices to turn everything around the right way. It also gets messy if I want to support the iPad's large screen, an iPhone or a Retina display since I have to then draw three sets of textures for everything and work out which ones to use. Should I be trying to map the 2D OpenGL co-ords 1:1 with the screen? While typing out this question it occurs to me that I could keep my origin in the centre, still running -1/+1 along the axes. This would let me scale my 2D content appropriately on the different screen sizes, but wouldn't I end up with the textures being scaled and possibly losing quality? I'm using OpenGLES 2.0 and have a matrix library that has equivalents to the GLES1.1 glOrthof() and glFrustrum() calls.

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• Texture not rendering in correct order in xna 4?

  - by user1090751

  I am making a simple board game. In the game there is a fixed background called myTexture and others are textureGoat and textureTiger whicha are to be placed on top of the background(myTexture). But i am having problem that fourth and fifth component is not displaying however, the sixth component( i.e. myTexture) is appearing. Here is my code, please look at it protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.Green); // TODO: Add your drawing code here spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend); //placing tiger spriteBatch.Draw(textureTiger, new Rectangle(22, 25, 50, 50), Color.White);//first component spriteBatch.Draw(textureTiger, new Rectangle(22, 407, 50, 50), Color.White);//second component spriteBatch.Draw(textureTiger, new Rectangle(422, 25, 50, 50), Color.White);//third component spriteBatch.Draw(textureTiger, new Rectangle(422, 407, 50, 50), Color.White);//fourth component //placing goat spriteBatch.Draw(textureGoat, new Rectangle(125, 110, 50, 50), Color.White);//fifth component //placing background spriteBatch.Draw(myTexture, new Rectangle(0, 0, 500, 500), Color.White);//sixth component spriteBatch.End(); base.Draw(gameTime); }

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• Isometric tile selection

  - by Dylan Lundy

  I'm not all that good with Maths. I'm trying to make a function to convert mouse coordinates into a particular tile in an isometric view. All of the algorithms I have seen so far work with the X & Y axes going diagonal, my game is currently set up like this, and I would like to keep it so. Is there an algorithm so that if the mouse was at the red dot, it would return the coordinates of the tile that it is sitting on? (6,2)

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• Memory allocation strategy for the vertex buffers (DirectX 10/11)

  - by Alex

  I have the following question. I write CAD system. So I have a 3D scene and there are many different objects (walls, doors, windows and so on). User can add or delete some objects. The question is: how can I organise the keeping of vertices for all my objects. I can create vertex buffer for every object. But I think drawing/switching from one buffer to another would have performance penalty. Another way - I can create several big buffers for every object type. But I don't understand how to update such buffers. It is too big to update whole buffer (for example buffer for all walls). What I need to do if I want to delete the object from the middle of the buffer? Actually I have the similar question: http://stackoverflow.com/questions/5515700/how-to-properly-update-vertex-buffers-in-directx-10 Most examples I've found work with very static models. Therefore, they tend to create a single vertex buffer with their list of points, and then are just manipulated by matrix transformations. I, on the other hand, will be updating the scene very often.

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• Implementing lighting similar as in CubeWorld

  - by Phito

  I am currently writing a voxel engine and my goal is to achieve something looking like CubeWorld. The problem that I am encountering is about lighting. I don't have a lot of knowledge in OpenGL but I don't think lighting in a game like that should be done with glLight. But beside that I have no idea of how to implement it. Here's what I have for the moment (with glLight): Do you have any ideas/link that could give me an idea of how to achieve that? Thanks

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• How can I teleport seamlessly, without using interpolation?

  - by modchan

  I've been implementing Bukkit plugin for creating toggleable in-game warping areas that will teleport any catched entity to other similar area. I was going to implement concept of non-Euclidean maze using this plugin, but, unfortunately, I've discovered that doing Entity.teleport() causes client to interpolate movement while teleporting, so player slides towards target like Enderman and receives screen updates, so for a split second all underground stuff is visible. While for "just teleport me where I want" usage this is just fine, it ruins whole idea of seamless teleporting, as player can clearly see when transfer happened even without need to look at debug screen. Is there possibility to somehow disable interpolating while teleporting without modifying client, or maybe prevent client from updating screen while it's being teleported?

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• enemy behavior with boundary to change direction

  - by BadSniper

  I'm doing space shooter kind of game, the logic is to reflect the enemy if it hits the boundary. With my logic, sometimes enemy behaves like flickering instead of changing the velocity. It's like trapped in the boundary and checking for if loops. This is my code for velocity changing: if(this->enemyPos.x>14) { this->enemyVel.x = -this->enemyVel.x; } if(this->enemyPos.x<-14) { this->enemyVel.x = -this->enemyVel.x; } How can I get around this? Its going out of boundary and don't know where to go and after sometimes its coming into field. I know whats the problem is, I dont know how to get around this problem.

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