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Search found 3566 results on 143 pages for '2d physics'.

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• 2D mouse coordinates from 3d object projection

  - by user17753

  Not entirely certain of the nomenclature here -- basically, after placing a model in world coordinates and setting up a 3D camera to look at it the model has been projected onto the screen in a 2D fashion. What I'd like to do is determine if the mouse is inside the projected view of the model. Is there a way to "unproject" in the XNA framework? Or what is this process called as, so that I can better search for it?

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• OpenGL Lighting

  - by gopgop

  I have a simple day and night cycle by at day disabling OpenGL lighting and at night enabling openGL Lighting. When I enable everything appears darker. My question is How would I make it that at a specific spot there would be a light that will only light up its surrounding area for example: http://media.giantbomb.com/uploads/0/276/1414275-light_large.png Where the light is is where I want to position my light. My application is in 2D.

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• Présentation des projets de la rubrique 2D / 3D / Jeux : huit jeux ont attiré notre attention

  Bonjour, La rubrique 2D / 3D / Jeux accueille de nombreux projets de création de jeux vidéo. Nous avons souhaité mettre en avant quelques uns d'entre eux et ce n'est pas pas moins de huit projets que nous présentons aujourd'hui. Il y en a pour tous les goûts : parmi eux, nous pouvons compter un remake évolué de Bomberman, un puzzle game, un jeu de stratégie, ... Nous vous souhaitons une bonne lecture....

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• Best game engine 2D for iOS

  - by Adelino

  which is the best 2D game enginefor iOS? I really need a game engine that allows me to modify the game code because I need to control the multi-touch events. I have a framework that detects the gesture that the player makes and I need to test this gesture recognizer in a game, so I have to have the freedom to change the game code. I don't want anything like GameSalad where you can't control anything. Thanks in advance.

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• Techniques for lighting a texture (no shadows)

  - by Paul Manta

  I'm trying to learn about dynamic shadows for 2D graphics. While I understand the basic ideas behind determining what areas should be lit and which should be in shadow, I don't know how I would "lighten" a texture in the first place. Could you go over various popular techniques for lighting a texture and what (dis)advantages each one has? Also, how is lighting a texture with colored light different from using white light?

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• Fusion-Icon does not show up in system tray

  - by Schubibuntu

  I can't find a solution for my problem online: I'm running Unity 2D in Ubuntu 11.10 and want to enable compiz effects. I installed compiz config settings manager, and Fusion-Icon, but when I start Fusion-Icon nothing happens. When I execute it from terminal it stucks at lines like "setting update 'command'" or "setting update 'next_key'" I already set the whitelist for the panel to 'all'. Anyone knows what I'm missing? Thanks in advance!

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• ubuntu switched back to ubuntu-2d in 12.04

  - by ved2254

  This problem may have been reported earlier but I was unable to find a solution to this. after trying to install Nvidia drivers my Ubuntu session changed to ubuntu-2d and I am unable to restore it to Ubuntu 3d. Which drivers I may need to install/remove to solve this problem? For further reference, heres a pic of how my workspace switcher looks like when changing workspaces. I would like it to be as it was when Ubuntu was first installed.

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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 plot a radius of all reachable points with pathfinding for a Mob (XNA)?

  - by PugWrath

  I am designing a tactical turn based game. The maps are 2d, but do have varying level-layers and blocking objects/terrain. I'm looking for an algorithm for pathfinding which will allow me to show an opaque shape representing all of the possible max-distance pixels that a mob can move to, knowing the mob's max pixel distance. Any thoughts on this, or do I just need to write a good pathfinding algorithm and use it to find the cutoff points for any direction in which an obstacle exists?

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• How to detect 2D line on line collision?

  - by Vish

  I'm a flash actionscript game developer who is a bit backward with mathematics, though I find physics both interesting and cool. For reference this is a similar game to the one I'm making: Untangled flash game I have made an untangled game almost to full completion of logic. But, when two lines intersect, I need those intersected or 'tangled' lines to show a different color; red. It would be really kind of you people if you could suggest an algorithm with/without math for detecting line segment collisions. I'm basically a person who likes to think 'visually' than 'arithmetically' :) P.S I'm trying to make a function as private function isIntersecting(A:Point, B:Point, C:Point, D:Point):Boolean Thanks in advance.

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• 3d transformation of game world keeping gameplay 2d - COCOS2D 2.0

  - by samfisher

  Using: COCOS2D + iOS. I want to rotate the game world, may be loading another .tmx file for another dimensions when user want to switch dimension. the effect what I am looking for is something like this:CLICK HERE What I have thought of till now: rotating CCCamera will be mandatory. Question: How will I have the other part of the level in place while the camera rotates/rotating? I can load a CCSprite and rotate it accordingly to the 3rd dimension. phew..!! Question: When the camera and world is rotated, will the player controls work properly.. I think not...? I think a better option would be to checkout with COCOS3D... there I could implement 3d world... right?? Question: Not sure how well 2d dynamics will work there as I want to user Box2d as physics engine.. could anyone provide suggestions? Regards, Sam

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• 2D vector graphic html5 framework

  - by Yury

  I trying to find html5 game framework by following criteria: 1)Real good performance. 2)Good support of vector graphic( objects which contains canvas elements -line, rec,bezierCurve etc.) 3)Easy port to mobile. Optional- Physics Engine. I found 1)Pixi.js- it looks like real good, but i didn't find any info about "vector objects" support. 2) i found "vector objects" support in paper.js I need something like these: http://paperjs.org/examples/chain/ and http://paperjs.org/examples/path-intersections/. But it looks like paper.js- not so good performance as pixi.js. And it is not game engine. Is there any good framework meets these requirements? P.S. I found similar question here Which free HTML5-based game engine meets these requirements?. But it was a long time ago. A lot of new things were created since 2011.

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• Hacked website, code is encrypted in hex, unable to identify

  - by dhakad

  my web site hacked and i am getting code in index page, but i am unable to find that where is the code in my web site... %3c%68%74%6d%6c%3e%3c%68%65%61%64%3e%0d%0a%3c%6d%65%74%61%20%63%6f%6e%74%65%6e%74%3d%22%74%65%78%74%2f%68%74%6d%6c%3b%20%63%68%61%72%73%65%74%3d%75%74%66%2d%38%22%3e%0d%0a%3c%74%69%74%6c%65%3e%2e%2f%20%72%45%64%20%58%20%7c%20%33%78%70%31%72%33%20%43%79%62%65%72%20%41%72%6d%79%3c%2f%74%69%74%6c%65%3e%0d%0a%3c%6d%65%74%61%20%6e%61%6d%65%3d%22%61%75%74%68%6f%72%22%20%63%6f%6e%74%65%6e%74%3d%22%72%45%64%20%58%22%20%2f%3e%0d%0a%3c%6d%65%74%61%20%6e%61%6d%65%3d%22%6b%65%79%77%6f%72%64%73%22%20%63%6f%6e%74%65%6e%74%3d%22%72%45%64%20%58%2c%33%78%70%31%72%33%20%43%79%62%65%72%20%41%72%6d%79%2c%5a%6f%6e%65%2d%48%2c%42%61%6e%67%6c%61%64%65%73%68%69%20%48%61%63%6b%65%72%22%20%2f%3e%0d%0a%3c%6d%65%74%61%20%6e%61%6d%65%3d%22%64%65%73%63%72%69%70%74%69%6f%6e%22%20%63%6f%6e%74%65%6e%74%3d%22%5b%20%72%45%64%20%58%20%2e%2e%20%54%68%65%20%52%65%61%6c%20%4f%75%74%72%61%67%65%6f%75%73%20%5d%22%20%2f%3e%0d%0a%3c%6c%69%6e%6b%20%72%65%6c%3d%22%53%48%4f%52%54%43%55%54%20%49%43%4f%4e%22%20%68%72%65%66%3d%22%68%74%74%70%3a%2f%2f%75%73%2e%79%69%6d%67%2e%63%6f%6d%2f%69%2f%6d%65%73%67%2f%65%6d%6f%74%69%63%6f%6e%73%37%2f%36%31%2e%67%69%66%22%3e%0d%0a%3c%73%74%79%6c%65%20%74%79%70%65%3d%22%74%65%78%74%2f%63%73%73%22%3e%0d%0a%62%6f%64%79%20%7b%62%61%63%6b%67%72%6f%75%6e%64%2d%69%6d%61%67%65%3a%20%75%72%6c%28%68%74%74%70%3a%2f%2f%6d%65%64%69%61%2e%73%6f%6d%65%77%68%65%72%65%69%6e%62%6c%6f%67%2e%6e%65%74%2f%69%6d%61%67%65%73%2f%6f%6e%64%68%6f%6b%61%72%65%72%5f%72%61%6a%70%75%74%72%61%5f%31%33%33%38%32%35%30%34%33%31%5f%31%2d%62%67%2e%67%69%66%29%3b%0d%0a%62%61%63%6b%67%72%6f%75%6e%64%2d%63%6f%6c%6f%72%3a%20%62%6c%61%63%6b%3b%63%6f%6c%6f%72%3a%20%23%46%46%41%35%30%30%3b%66%6f%6e%74%2d%77%65%69%67%68%74%3a%20%62%6f%6c%64%3b%74%65%78%74%2d%61%6c%69%67%6e%3a%20%63%65%6e%74%65%72%3b%7d%0d%0a%69%6d%67%7b%6f%70%61%63%69%74%79%3a%30%2e%37%35%3b%20%66%69%6c%74%65%72%3a%61%6c%70%68%61%28%6f%70%61%63%69%74%79%3d%37%35%29%3b%7d%0d%0a%2e%72%65%64%78%20%7b%74%65%78%74%2d%73%68%61%64%6f%77%3a%20%30%20%30%20%36%70%78%20%72%65%64%2c%20%30%20%30%20%35%70%78%20%72%65%64%2c%20%30%20%30%20%35%70%78%20%72%65%64%3b%63%6f%6c%6f%72%3a%20%23%46%46%46%7d%0d%0a%3c%2f%73%74%79%6c%65%3e%0d%0a%3c%2f%68%65%61%64%3e%0d%0a%3c%62%6f%64%79%20%6f%6e%63%6f%6e%74%65%78%74%6d%65%6e%75%3d%22%72%65%74%75%72%6e%20%66%61%6c%73%65%22%20%6f%6e%6b%65%79%64%6f%77%6e%3d%22%72%65%74%75%72%6e%20%66%61%6c%73%65%22%20%6f%6e%6d%6f%75%73%65%64%6f%77%6e%3d%22%72%65%74%75%72%6e%20%66%61%6c%73%65%22%3e%0d%0a%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%66%61%6d%69%6c%79%3a%20%50%61%6c%61%74%69%6e%6f%20%4c%69%6e%6f%74%79%70%65%3b%66%6f%6e%74%2d%73%69%7a%65%3a%20%34%36%70%78%3b%22%20%63%6c%61%73%73%3d%22%72%65%64%78%22%3e%2e%3a%3a%20%72%45%64%20%58%20%57%61%73%20%48%65%72%65%20%3a%3a%2e%3c%2f%64%69%76%3e%3c%62%72%2f%3e%0d%0a%3c%69%6d%67%20%73%72%63%3d%22%68%74%74%70%3a%2f%2f%6d%65%64%69%61%2e%73%6f%6d%65%77%68%65%72%65%69%6e%62%6c%6f%67%2e%6e%65%74%2f%69%6d%61%67%65%73%2f%6f%6e%64%68%6f%6b%61%72%65%72%5f%72%61%6a%70%75%74%72%61%5f%31%33%35%33%35%35%32%36%35%31%5f%31%2d%72%65%64%2d%78%2e%6a%70%67%22%3e%3c%62%72%2f%3e%0d%0a%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%66%61%6d%69%6c%79%3a%20%42%6f%6f%6b%6d%61%6e%20%4f%6c%64%20%53%74%79%6c%65%3b%63%6f%6c%6f%72%3a%20%23%30%30%30%3b%66%6f%6e%74%2d%73%69%7a%65%3a%20%32%30%70%78%3b%6d%61%72%67%69%6e%3a%30%3b%74%65%78%74%2d%73%68%61%64%6f%77%3a%20%30%20%31%70%78%20%33%70%78%20%23%30%30%46%46%30%30%2c%20%2d%31%70%78%20%30%20%33%70%78%20%23%30%30%46%46%30%30%2c%20%30%20%2d%31%70%78%20%33%70%78%20%23%30%30%46%46%30%30%2c%20%31%70%78%20%30%20%33%70%78%20%23%30%30%46%46%30%30%3b%22%3e%50%72%6f%75%64%20%54%6f%20%62%65%20%61%20%42%61%6e%67%6c%61%64%65%73%68%69%20%48%61%63%6b%65%72%3c%2f%64%69%76%3e%3c%62%72%2f%3e%0d%0a%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%66%61%6d%69%6c%79%3a%20%42%65%72%6c%69%6e%20%53%61%6e%73%20%46%42%3b%63%6f%6c%6f%72%3a%20%23%31%35%31%42%35%34%3b%66%6f%6e%74%2d%73%69%7a%65%3a%20%32%30%70%78%3b%74%65%78%74%2d%73%68%61%64%6f%77%3a%20%30%20%30%20%33%70%78%20%23%30%30%46%46%30%30%2c%20%30%20%30%20%33%70%78%20%23%30%30%46%46%30%30%2c%20%30%20%30%20%33%70%78%20%23%66%66%66%2c%20%30%20%30%20%35%70%78%20%23%46%30%30%2c%20%30%20%30%20%35%70%78%20%23%66%66%32%64%39%35%3b%22%3e%44%65%61%72%20%41%44%4d%49%4e%3c%62%72%2f%3e%21%20%53%65%63%75%72%65%20%79%6f%75%72%20%53%49%54%45%20%21%3c%2f%64%69%76%3e%3c%62%72%2f%3e%0d%0a%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%73%69%7a%65%3a%20%31%38%70%78%3b%66%6f%6e%74%2d%66%61%6d%69%6c%79%3a%20%43%65%6e%74%75%72%79%20%47%6f%74%68%69%63%3b%63%6f%6c%6f%72%3a%20%23%30%30%30%3b%74%65%78%74%2d%73%68%61%64%6f%77%3a%20%30%20%30%20%33%70%78%20%6c%69%6d%65%2c%20%30%20%30%20%33%70%78%20%6c%69%6d%65%2c%20%30%20%30%20%35%70%78%20%23%66%66%32%64%39%35%2c%20%30%20%30%20%35%70%78%20%23%66%66%32%64%39%35%3b%22%3e%72%65%64%2d%78%40%68%61%63%6b%65%72%6d%61%69%6c%2e%63%6f%6d%3c%2f%64%69%76%3e%0d%0a%3c%62%72%2f%3e%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%73%69%7a%65%3a%20%32%30%70%78%3b%22%3e%2e%2e%3a%3a%7c%20%47%72%65%65%74%7a%20%7c%3a%3a%2e%2e%3c%2f%64%69%76%3e%0d%0a%3c%64%69%76%20%73%74%79%6c%65%3d%22%66%6f%6e%74%2d%66%61%6d%69%6c%79%3a%20%42%6f%6f%6b%20%41%6e%74%69%71%75%61%3b%63%6f%6c%6f%72%3a%20%67%72%65%79%3b%66%6f%6e%74%2d%73%69%7a%65%3a%20%32%30%70%78%3b%74%65%78%74%2d%73%68%61%64%6f%77%3a%20%72%65%64%20%31%70%78%20%2d%30%70%78%20%36%70%78%22%3e%2e%3a%3a%20%78%33%6f%2d%31%33%33%37%20%7c%20%47%61%62%62%79%20%7c%20%24%70%21%72%21%74%7e%24%33%33%6b%33%72%20%7c%20%46%72%45%61%4b%79%20%3a%3a%2e%3c%62%72%2f%3e%41%6c%6c%20%4d%65%6d%62%65%72%73%20%6f%66%20%33%78%70%31%72%33%20%43%79%62%65%72%20%41%72%6d%79%3c%2f%64%69%76%3e%3c%62%72%2f%3e%0d%0a%3c%65%6d%62%65%64%20%73%72%63%3d%22%68%74%74%70%3a%2f%2f%79%6f%75%74%75%62%65%2e%67%6f%6f%67%6c%65%61%70%69%73%2e%63%6f%6d%2f%76%2f%70%74%5a%31%77%6f%33%4a%73%50%63%26%61%75%74%6f%70%6c%61%79%3d%31%26%6c%6f%6f%70%3d%31%22%20%74%79%70%65%3d%22%61%70%70%6c%69%63%61%74%69%6f%6e%2f%78%2d%73%68%6f%63%6b%77%61%76%65%2d%66%6c%61%73%68%22%20%77%6d%6f%64%65%3d%22%74%72%61%6e%73%70%61%72%65%6e%74%22%20%77%69%64%74%68%3d%22%31%22%20%68%65%69%67%68%74%3d%22%31%22%3e%3c%2f%62%6f%64%79%3e%3c%2f%68%74%6d%6c%3e'

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• Draw a position from a 2d Array on respected canvas location

  - by Anon

  Background: I have two 2d arrays. Each index within each 2d array represents a tile which is drawn on a square canvas suitable for 8 x 8 tiles. The first 2d array represents the ground tiles and is looped and drawn on the canvas using the following code: //Draw the map from the land 2d array map = new Canvas(mainFrame, 20, 260, 281, 281); for(int i=0; i < world.length; i++){ for(int j=0; j < world[i].length; j++){ for(int x=0; x < 280; x=x+35){ for(int y=0; y < 280; y=y+35){ Point p = new Point(x,y); map.add(new RectangleObject(p,35,35,Colour.green)); } } } } This creates a grid of green tiles 8 x 8 across as intended. The second 2d array represents the position on the ground. This 2d array has everyone of its indexes as null apart from one which is comprised of a Person class. Problem I am unsure of how I can draw the position on the grid. I was thinking of a similar loop, so it draws over the previous 2d array another set of 64 tiles. Only this time they are all transparent but the one tile which isn't null. In other words, the tile where Person is located. I wanted to use a search throughout the loop using a comparative if statement along the lines of if(!(world[] == null)){ map.add(new RectangleObject(p,35,35,Colour.red));} However my knowledge is limited and I am confused on how to implement it.

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• What language should I learn to make 2D turn-based video games?

  - by giggles

  I want to make 2 dimensional turn-based games for the PC. Something like early Final Fantasy or Chrono Trigger. Is C++ the only plausible option? I keep getting told that C++ is the language of choice for games, but is this the case even for 2D, turn-based games? Are any other languages good for this sort of thing? I'm really big on clean, readable, extendible code, so a language that fosters that sort of thing would be great. Doing this for fun, not business. Java is the only language I really know well right now. By the way, this is my first question and I'm a noob. I read the FAQ, but if I'm doing anything noobish anyway, then I'm sorry.

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• Unity 3d support for multiple X-screens

  - by stewbond

  I've installed Ubuntu 12.04 this weekend and have had problems getting Unity3d to work with my triple monitor set-up. I've installed the latest nVidia drivers for my 2 nVidia video cards and have used NVIDIA X Server Settings to configure everything. If I stick each monitor on a separate X screen, all but the primary X screen will appear white and the cursor will be a black X. I can start a terminal on this screen but cannot drag other windows to it. If I kill the "Nautilus" process, the white background disappears and I see my desktop background, but my cursor is still an X and I still cannot drag windows to it. If I enable TwinView, I can get one screen on two monitors to work properly, but the white screen remains on my third monitor. In addition, I don't like using TwinView because my full-screen applications get stretched. My current solution is to "Enable Xinerama", use all separate X screens and revert to Unity2d. I'd love a solution to this as Ubuntu 12.10 is not planned to support Unity-2d and prefer the aesthetics of 3d anyways. I can provide Xorg.conf for all configurations and any other suggested diagnostic information. Below is my closest-to-working xorg.conf: # nvidia-settings: X configuration file generated by nvidia-settings # nvidia-settings: version 295.33 (buildd@zirconium) Fri Mar 30 13:38:49 UTC 2012 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" RightOf "Screen2" Screen 1 "Screen1" RightOf "Screen0" Screen 2 "Screen2" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "1" EndSection Section "Files" EndSection Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Microvitec PLC MV191" HorizSync 30.0 - 81.0 VertRefresh 56.0 - 75.0 Option "DPMS" EndSection Section "Monitor" Identifier "Monitor1" VendorName "Unknown" ModelName "CRT-1" HorizSync 28.0 - 55.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Monitor" Identifier "Monitor2" VendorName "Unknown" ModelName "Microvitec PLC MV191" HorizSync 30.0 - 81.0 VertRefresh 56.0 - 75.0 Option "DPMS" EndSection Section "Monitor" Identifier "Monitor3" VendorName "Unknown" ModelName "Microvitec PLC MV191" HorizSync 30.0 - 81.0 VertRefresh 56.0 - 75.0 EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GTS 450" BusID "PCI:1:0:0" Screen 0 EndSection Section "Device" Identifier "Device1" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce 9500 GT" BusID "PCI:2:0:0" EndSection Section "Device" Identifier "Device2" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GTS 450" BusID "PCI:1:0:0" Screen 1 EndSection Section "Device" Identifier "Device3" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GTS 450" BusID "PCI:1:0:0" Screen 2 EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "DFP-0: 1280x1024_75 +0+0; DFP-0: 1280x1024 +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen2" Device "Device2" Monitor "Monitor2" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "DFP-2: 1280x1024_75 +0+0; DFP-2: nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "Screen3" Device "Device3" Monitor "Monitor3" DefaultDepth 24 Option "TwinView" "0" Option "metamodes" "DFP-2: nvidia-auto-select +0+0" SubSection "Display" Depth 24 EndSubSection EndSection Section "Extensions" Option "Composite" "Disable" EndSection Other people have had similar issues. I haven't been successful at any of the few suggestions submitted. Can not get Dual Monitors to work on Different GPUs http://askubuntu.com/questions/30412/3-monitors-with-2-video-cards-not-working?rq=1 How to get second display to work alongside primary display? http://askubuntu.com/questions/148007/multiple-monitors-only-work-with-unity-2d/201086#201086 xorg.conf and Unity3D?

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• Help finding time of collision

  - by WannaBe

  I am making a simple game right now and am struggling with collision response. My goal is to someday be able to turn it into a 2D platformer but I have a long way to go. I am currently making this in JavaScript and using the canvas element so (0,0) is in the top left and positive X is to the right and positive Y is down. I read a helpful post on StackExchange that got me started on this but I can't seem to get the algorithm 100% correct. How to deal with corner collisions in 2D? I can detect the collision fine but I can't seem to get the response right. The goal is to detect which side the player hit first since minimum displacement doesn't always work. The X response seems to work fine but the Y only works when I am far from the corners. Here is a picture showing what happens Here is the code var bx = box.x; var by = box.y; var bw = box.width; var bh = box.height; var boxCenterX = bx + (bw/2); var boxCenterY = by + (bh/2); var playerCenterX = player.x + player.xvel + (player.width/2); var playerCenterY = player.y + player.yvel + (player.height/2); //left = negative and right = positve, 0 = middle var distanceXin = playerCenterX - boxCenterX; var distanceYin = playerCenterY - boxCenterY; var distanceWidth = Math.abs(distanceXin); var distanceHeight = Math.abs(distanceYin); var halfWidths = (bw/2) + (player.width/2); var halfHeights = (bh/2) + (player.height/2); if(distanceWidth < halfWidths){ //xcollision if(distanceHeight < halfHeights){ //ycollision if(player.xvel == 0){ //adjust y if(distanceYin > 0){ //bottom player.y = by + bh; player.yvel = 0; }else{ player.y = by - player.height; player.yvel = 0; } }else if(player.yvel == 0){ //adjust x if(distanceXin > 0){ //right player.x = bx + bw; player.xvel = 0; }else{ //left player.x = bx - player.width; player.xvel = 0; } }else{ var yTime = distanceYin / player.yvel; var xTime = distanceXin / player.xvel; if(xTime < yTime){ //adjust the x it collided first if(distanceXin > 0){ //right player.x = bx + bw; player.xvel = 0; }else{ //left player.x = bx - player.width; player.xvel = 0; } }else{ //adjust the y it collided first if(distanceYin > 0){ //bottom player.y = by + bh; player.yvel = 0; }else{ player.y = by - player.height; player.yvel = 0; } } } } } And here is a JSFiddle if you would like to see the problem yourself. http://jsfiddle.net/dMumU/ To recreate this move the player to here And press up and left at the same time. The player will jump to the right for some reason. Any advice? I know I am close but I can't seem to get xTime and yTime to equal what I want every time.

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• Create a trailing, ghosting effect of a sprite

  - by Neeko

  I want to create a trailing, ghosting like effect of a sprite that's moving fast. Something very similar to this image of Sonic (apologies of bad quality, it's the only example I could find of the effect I'm looking to achieve) However, I don't want to do this at the sprite sheet level, to avoid having to essentially double (or possibly quadruple) the amount of sprites in my atlas. It's also very labor intensive. So is there any other way to achieve this effect? Possibly by some shader voodoo magic? I am using Unity and 2D Toolkit, if that helps.

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• Creating ground in a 2D runner game

  - by user739711

  It may be a repetitive uestion but I could not find any specific answer to my query How to create A slanted/curved ground in a 2d runner game. The user will see side view like the old game "Mario" If I use tiled based map I can have only rectangular objects. What is the best way to create tilted ground? Should I use tiled based map, or should I define corner points in the map and create the ground programatically? And what are the difficulties in creating curved ground.

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• OpenGL ES 2.0: Vertex and Fragment Shader for 2D with Transparency

  - by Bunkai.Satori

  Could I knindly ask for correct examples of OpenGL ES 2.0 Vertex and Fragment shader for displaying 2D textured sprites with transparency? I have fairly simple shaders that display textured polygon pairs but transparency is not applied despite: texture map contains transparency information Blending is enabled: glEnable(GL_BLEND); glEnable(GL_DEPTH_TEST); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); My Vertex Shader: uniform mat4 uOrthoProjection; uniform vec3 Translation; attribute vec4 Position; attribute vec2 TextureCoord; varying vec2 TextureCoordOut; void main() { gl_Position = uOrthoProjection * (Position + vec4(Translation, 0)); TextureCoordOut = TextureCoord; } My Fragment Shader: varying mediump vec2 TextureCoordOut; uniform sampler2D Sampler; void main() { gl_FragColor = texture2D(Sampler, TextureCoordOut); }

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• Incorrect colour blending when using a pixel shader with XNA

  - by MazK

  I'm using XNA 4.0 to create a 2D game and while implementing a layer tinting pixel shader I noticed that when the texture's alpha value is anything between 1 or 0 the end result is different than expected. The tinting works from selecting a colour and setting the amount of tint. This is achieved via the shader which works out first the starting colour (for each r, g, b and a) : float red = texCoord.r * vertexColour.r; and then the final tinted colour : output.r = red + (tintColour.r - red) * tintAmount; The alpha value isn't tinted and is left as : output.a = texCoord.a * vertexColour.a; The picture in the link below shows different backdrops against an energy ball object where it's outer glow hasn't blended as I would like it to. The middle two are incorrect as the second non tinted one should not show a glow against a white BG and the third should be entirely invisible. The blending function is NonPremultiplied. Why the alpha value is interfering with the final colour?

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• Keyboard shortcuts are not working when unity plugin in ccsm is disabled?

  - by Pioneer11X

  I am using ubuntu 11.10 with unity 2d , I dont like the unity launcher and use Docky . So , i have created a new seeion and using some tweaking and playing around i have been successful to get rid of the unity launcher and make a perfect interface that i like , but there are two problems .. Keyboard shortcuts not working I had to disable the ubuntu unity plugin in ccsm to get rid of the unity laucher..when it is enabled , i can use the keyboard shortcuts such as alt+tab etc .. But when i disable it , I am unable to use some shortcuts , I can still use some shortcuts like alt+F4 ect. When I maximise a window , it used to show two window (close , maximise , minimize )buttons and title bars So , i set the window decoration in ccsm to !maxvert from any , and it is working fine for most of the time until i try to snsp the window to a side then the title bar just disappears , leaving space between the panel and the window , I cant close this window until i use the alt+mouse to drag it out , because no buttons would be displayed ..

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• Performance of pixel shaders vs. SpriteBatch: XNA

  - by ashes999

  Precondition: I read this question/answer about using shaders, or spritebatch, to render and mark a sprite. I need to do something like that. I also have a 2D lighting PoC which I need to write. The way it will work will basically be something like: Draw all the sprites Draw lighting gradients to create a lighting texture Multiply/add the lighting texture to achieve different effects (I use multiple passes of add/multiply the lighting texture to achieve different effects.) My question is really about a generalization: can I say with certainty that pixel shaders are always faster than adding/multiplying textures to the SpriteBatch? Or that adding/multiplying is always faster? Or if it's not generalizable, how do I decide which approach to take, given that I can probably code either of them? (If it matters, I'm using MonoGame 3.0 beta for Windows games)

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• Suggestions for implementing a dynamic 2D level

  - by Wouter

  I am working on a game that needs a level that is completely generated. Currently my approach is to draw textures for the levels pixel by pixel during the game (in XNA with SpriteBatch). This is too intensive unfortunately. The game has frame drops even when I only draw 1 level texture each draw cycle. Here is an example of the current prototype. It is a simple sidescroller with the avatar swimming through a cave. The shape of this cave will alter throughout the level (textures and physics collision shapes). You can clearly see the boundaries of the level tiles in the screenshot below. These are generated just before they move into camera view. For inspiration I looked at PixelJunk Shooter 2. These levels are obviously not generated, but some of the levels have movement. How do you guys think they implemented it? My guess is that the level and other objects in the game are actually flat 3d models, but I am not sure..

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• Swept AABB vs Line Segment 2D

  - by Larolaro

  I've really exhausted as much as Google has to give, I've spent a solid week googling every combination of words for an "AABBvsLine sweep", downloaded countless collision demos, dissected SAT intersection examples and an AABBvsAABB sweep trying to figure out how to approach this. I've not found a single thing covering this specific pairing. Can anyone shed any light on how to get the hit time of a swept AABB vs a Line segment in 2D? I'm still getting familiar with the SAT but I do know how to implement it to a degree, I'm just not sure how to extract the hit time from the velocity in the non axis aligned separating axes for the sweep. I really would appreciate anything at the moment, some code or even some helpful links, I'm at my wits end!

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