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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%2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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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• Box 2d basic questions

  - by philipp

  I am a bit new to box2d and I am developing an game with type and letters. I am using an svg font and generate the box2d bodies direct from the glyphs path definition, using the convex hull of them. I also have an decomposition routine the decomposes this hull if necessary. All this it is more or less working, except that I got some strange errors which definitely are caused by the scale factors. The problem is caused by two factors: first: the world scale of box2d, second: the the precision of curve-approximation of the glyph vectors. So through scaling down the input vertices for box2d, it happens that they become equal caused by numerical precision, what causes errors in box2d. Through scaling the my glyphs a bit up, this goes away. I also goes away if I chose a different world scale factor, but this slows down the whole animation quite much! So if my view port is about 990px * 600px and i want to animate Glyphs in box2d which should have a size from about 50px * 50px up to 300px * 300px, which scale factor of the b2world should i choose? How small should the smallest distance from on vertex to another be, while approximating the glyph vectors? Thanks for help greetings philipp EDIT:: I continued reading the docs of box2d and after rethinking of the units system, which is designed to handle object from 0.1 up to 10 meters, I calculated a scale factor of 75. So Objects 600px width will are 8 meters wide in box2d and even small objects of about 20px width will become 0.26 meters width in box2d. I will go on trying with this values, but if there is somebody out there who could give me a clever advice i would be happy!

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• JBox2D applyLinearImpulse doesn't work

  - by Romeo

  So i have this line of code: if(input.isKeyDown(Input.KEY_W)&&canJump()) { body.applyLinearImpulse(new Vec2(0, 30), cam.screenToWorld(body.getPosition())); System.out.println("I can jump!"); } My problem is that the console display I can jump! but the body doesn't do that. Can you explain to me if i do something wrong? Some more code. This function creates my 'hero' the one supposed to jump. private Body setDynamic(float width, float height, float x, float y) { PolygonShape shape = new PolygonShape(); shape.setAsBox(width/2, height/2); BodyDef bd = new BodyDef(); bd.allowSleep = true; bd.position = new Vec2(cam.screenToWorld(new Vec2(x + width / 2, y + height / 2))); bd.type = BodyType.DYNAMIC; bd.userData = new BodyInfo(width, height); Body body = world.createBody(bd); body.createFixture(shape, 10); return body; } And this is the main update loop: if(input.isKeyDown(Input.KEY_A)) { body.setLinearVelocity(new Vec2(-10*delta, body.getLinearVelocity().y)); } else if (input.isKeyDown(Input.KEY_D)) { body.setLinearVelocity(new Vec2(10*delta, body.getLinearVelocity().y)); } else { body.setLinearVelocity(new Vec2(0, body.getLinearVelocity().y)); } if(input.isKeyDown(Input.KEY_W)&&canJump()) { body.applyLinearImpulse(new Vec2(0, 30), body.getPosition()); System.out.println("I can jump!"); } world.step(delta * 0.001f, 10, 5); }

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• OpenGL: Move camera regardless of rotation

  - by Markus

  For a 2D board game I'd like to move and rotate an orthogonal camera in coordinates given in a reference system (window space), but simply can't get it to work. The idea is that the user can drag the camera over a surface, rotate and scale it. Rotation and scaling should always be around the center of the current viewport. The camera is set up as: gl.glMatrixMode(GL2.GL_PROJECTION); gl.glLoadIdentity(); gl.glOrtho(-width/2, width/2, -height/2, height/2, nearPlane, farPlane); where width and height are equal to the viewport's width and height, so that 1 unit is one pixel when no zoom is applied. Since these transformations usually mean (scaling and) translating the world, then rotating it, the implementation is: gl.glMatrixMode(GL2.GL_MODELVIEW); gl.glLoadIdentity(); gl.glRotatef(rotation, 0, 0, 1); // e.g. 45° gl.glTranslatef(x, y, 0); // e.g. +10 for 10px right, -2 for 2px down gl.glScalef(zoomFactor, zoomFactor, zoomFactor); // e.g. scale by 1.5 That however has the nasty side effect that translations are transformed as well, that is applied in world coordinates. If I rotate around 90° and translate again, X and Y axis are swapped. If I reorder the transformations so they read gl.glTranslatef(x, y, 0); gl.glScalef(zoomFactor, zoomFactor, zoomFactor); gl.glRotatef(rotation, 0, 0, 1); the translation will be applied correctly (in reference space, so translation along x always visually moves the camera sideways) but rotation and scaling are now performed around origin. It shouldn't be too hard, so what is it I'm missing?

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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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• Best depth sorting method for a Top Down 2D game using a 3D physics engine

  - by Alic44

  I've spent many days googling this and still have issues with my game engine I'd like to ask about, which I haven't seen addressed before. I think the problem is that my game is an unusual combination of a completely 2D graphical approach using XNA's SpriteBatch, and a completely 3D engine (the amazing BEPU physics engine) with rotation mostly disabled. In essence, my question is similar to this one (the part about "faux 3D"), but the difference is that in my game, the player as well as every other creature is represented by 3D objects, and they can all jump, pick up other objects, and throw them around. What this means is that sorting by one value, such as a Z position (how far north/south a character is on the screen) won't work, because as soon as a smaller creature jumps on top of a larger creature, or a box, and walks backwards, the moment its z value is less than that other creature, it will appear to be behind the object it is actually standing on. I actually originally solved this problem by splitting every object in the game into physics boxes which MUST have a Y height equal to their Z depth. I then based the depth sorting value on the object's y position (how high it is off the ground) PLUS its z position (how far north or south it is on the screen). The problem with this approach is that it requires all moving objects in the game to be split graphically into chunks which match up with a physical box which has its y dimension equal to its z dimension. Which is stupid. So, I got inspired last night to rewrite with a fresh approach. My new method is a little more complex, but I think a little more sane: every object which needs to be sorted by depth in the game exposes the interface IDepthDrawable and is added to a list owned by the DepthDrawer object. IDepthDrawable contains: public interface IDepthDrawable { Rectangle Bounds { get; } //possibly change this to a class if struct copying of the xna Rectangle type becomes an issue DepthDrawShape DepthShape { get; } void Draw(SpriteBatch spriteBatch); } The Bounds Rectangle of each IDepthDrawable object represents the 2D Axis-Aligned Bounding Box it will take up when drawn to the screen. Anything that doesn't intersect the screen will be culled at this stage and the remaining on-screen IDepthDrawables will be Bounds tested for intersections with each other. This is where I get a little less sure of what I'm doing. Each group of collisions will be added to a list or other collection, and each list will sort itself based on its DepthShape property, which will have access to the object-to-be-drawn's physics information. For starting out, lets assume everything in the game is an axis aligned 3D Box shape. Boxes are pretty easy to sort. Something like: if (depthShape1.Back > depthShape2.Front) //if depthShape1 is in front of depthShape2. //depthShape1 goes on top. else if (depthShape1.Bottom > depthShape2.Top) //if depthShape1 is above depthShape2. //depthShape1 goes on top. //if neither of these are true, depthShape2 must be in front or above. So, by sorting draw order by several different factors from the physics engine, I believe I can get a really correct draw order. My question is, is this a good way of going about this, or is there some tried and true, tested way which is completely different and has somehow completely eluded me on the internets? And, if this does seem like a good way to remake my draw order sorting, what's the right sorting algorithm for reordering the Bounds Rectangle collision lists, and how do you deal with a Bounds Rectangle colliding with two different object which don't collide with eachother. I know these are solved problems, but I've only been programming for a year so any specific input here will be greatly appreciated. Thanks for reading this far, ye who made it -- sorry it was so long!

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• A training world nugget for being taught by the best

  - by Testas

  June represents an exciting time for the SQL Server community with events all over the country in the next few months and there is plenty of knowledge to be gained from willing speakers enthusiastically sharing their knowledge. Furthermore, Paul Randall and Kimberley Trip will be conducting their highly recommended immersion events at London Heathrow in June.There are other big names within SQL Server that will be teaching this year. The company I used to work for, QA, has excellent trainers teaching SQL Server who I would always recommend. Occasionally a big name speaker will be take a course, unknowingly to the community. Solid Quality Mentors is such a company where their staff will teach at QA offices from time to time. And I know from conversation with Itzik Ben-Gan that he will be teaching Advanced TSQL within QA offices in London during the week of Oct 3-7. A link to the course details can be found here.http://www.qa.com/training-courses/technical-it-training/microsoft/microsoft-sql-server/microsoft-sql-server-2008-and-r2/advanced-t-sql-querying,-programming-and-tuning-for-sql-server-2005--2008So if you want to be taught by the best experts, consider checking www.QA.com for their advanced SQL courses, you could find yourself being taught by the best in the business in their field.Chris  

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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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• Potentially The World’s Filthiest PC [Video]

  - by Jason Fitzpatrick

  We’re confident we’ve seen some dusty PC cases in our day, but nothing we’ve ever cleaned produced the sheer volume of smoke-bomb like dust this neglected tower spews out. That noise you hear, about 1:15 into the video, is the sound of the compressor motor kicking back on to top off the pressure tank: behold, a PC so filthy the compressor cleaning it out needs to take a break! [via Geeks Are Sexy] HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• World Class Training For Them, an Amazon Gift Certificate For You

  - by Adam Machanic

  We have just two weeks to go before Paul Randal and Kimberly Tripp touch down in the Boston area to deliver their famous SQL Server Immersions course . This is going to be a truly fantastic SQL Server learning experience and we're hoping a few more people will join in the fun. This is where you come in: we have a few vacant seats remaining and we need your help spreading the word. Simply tell your friends and colleagues about the course and e-mail me (adam [at] bostonsqltraining [dot] com) the names...(read more)

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• How could you parallelise a 2D boids simulation

  - by Sycren

  How could you program a 2D boids simulation in such a way that it could use processing power from different sources (clusters, gpu). In the above example, the non-coloured particles move around until they cluster (yellow) and stop moving. The problem is that all the entities could potentially interact with each other although an entity in the top left is unlikely to interact with one in the bottom right. If the domain was split into different segments, it may speed the whole thing up, But if an entity wanted to cross into another segment there may be problems. At the moment this simulation works with 5000 entities with a good frame rate, I would like to try this with millions if possible. Would it be possible to use quad trees to further optimise this? Any other suggestions?

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• Podcast Show Notes: Architecture in a Post-SOA World

  - by Bob Rhubart

  All three segments of my conversation with Oracle ACE Director Hajo Normann, SOA author Jeff Davies, and enterprise architect Pat Shepherd are now available. This conversation was recorded on March 9, 2010, and covered a lot of territory, from the lingering fear of SOA among many in IT, to the misinformation behind that fear, to a discussion of the future of enterprise architecture. Listen to Part 1 Listen to Part 2 Listen to Part 3 If you’d like to engage any of the panelists in your own conversation, the links below will help: Hajo Normann is a SOA architect and consultant at EDS in Frankfurt Blog | LinkedIn | Oracle Mix | Oracle ACE Profile | Books Jeff Davies is a Senior Product Manager at Oracle, and is the primary author of The Definitive Guide to SOA: Oracle Service Bus Homepage | Blog | LinkedIn | Oracle Mix Pat Shepherd is an enterprise architect with the Oracle Enterprise Solutions Group. Oracle Mix | LinkedIn | Blog New panelists and new topics coming next week, so stay tuned: RSS   Technorati Tags: oracle,otn,arch2arch,architect,communiity,enterprise architecture,podcast,soa,service-oriented architecture del.icio.us Tags: oracle,otn,arch2arch,architect,communiity,enterprise architecture,podcast,soa,service-oriented architecture

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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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• Autoscaling in a modern world&hellip;. Part 3

  - by Steve Loethen

  The Wasabi Hands on Labs give you a good look at the basic mechanics, but I don’t find the setup too practical.  Using a local console application to host the Autoscaler and rules files is probably the (IMHO) least likely architecture.  Far more common would be hosting in a service on premise (if you want to have the Autoscaler local) or most likely, host it in a Azure role of it’s own.  I chose to go the Azure route. First step was to get the rules.xml and the services.xml files into the cloud.  I tend to be a “one step at a time” sort of guy, so running the console application with the rules sitting in a Azure hosted set of blobs seemed to be the logical first step.  Here are the steps: 1) Create a container in the storage account you wish to use.  Name does not matter, you will get a chance to set the container name (as well as the file names) in the app.config 2) Copy the two files from where you created them to your  container.  I used the same files I had locally.  I made the container public to eliminate security issues, but in the final application, a bit of security needs to be applied (one problem at a time).  The content type was set to text/xml.  I found one reference claiming the importance of this step, and it makes sense. 3) Adjust the app.config to set the location of the files.  This will let you set all the storage account and key information needed to reach into the cloud form your console application.  The sections of your app.config will look like this: <rulesStores> <add name="Blob Rules Store" type="Microsoft.Practices.EnterpriseLibrary.WindowsAzure.Autoscaling.Rules.Configuration.BlobXmlFileRulesStore, Microsoft.Practices.EnterpriseLibrary.WindowsAzure.Autoscaling, Version=5.0.1118.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" blobContainerName="[ContainerName]" blobName="rules.xml" storageAccount="DefaultEndpointsProtocol=https;AccountName=[StorageAccount];AccountKey=[AccountKey]" monitoringRate="00:00:30" certificateThumbprint="" certificateStoreLocation="LocalMachine" checkCertificateValidity="false" /> </rulesStores> <serviceInformationStores> <add name="Blob Service Information Store" type="Microsoft.Practices.EnterpriseLibrary.WindowsAzure.Autoscaling.ServiceModel.Configuration.BlobXmlFileServiceInformationStore, Microsoft.Practices.EnterpriseLibrary.WindowsAzure.Autoscaling, Version=5.0.1118.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" blobContainerName="[ContainerName]" blobName="services.xml" storageAccount="DefaultEndpointsProtocol=https;AccountName=[StorageAccount];AccountKey=[AccountKey]" monitoringRate="00:00:30" certificateThumbprint="" certificateStoreLocation="LocalMachine" checkCertificateValidity="false" /> </serviceInformationStores> Once I had the files up in the sky, I renamed the local copies to just to make my self feel better about the application using the correct set of rules and services.  Deploy the web role to the cloud.  Once it is up and running, start the console application.  You should find the application scales up and down in response to the buttons on the web site.  Tune in next time for moving the hosting of the Autoscaler to a worker role, discussions on getting the logging information into diagnostics into storage, and a set of discussions about certs and how they play a role.

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• World Bank to Launch Apps For Development Challenge

  The organization is opening up its databases so developers can make new apps and mash-ups.

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• World Bank to Launch Apps For Development Challenge

  The organization is opening up its databases so developers can make new apps and mash-ups.

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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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• World Bank to Launch Apps For Development Challenge

  The organization is opening up its databases so developers can make new apps and mash-ups.

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• World Bank to Launch Apps For Development Challenge

  The organization is opening up its databases so developers can make new apps and mash-ups.

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• Nokia vs. The World

  - by Michael B. McLaughlin

  I’m looking forward to the launch of the Nokia Lumia 920. Why? Well, it stacks up better than the competition for one thing. Then there’s also that security problem that certain other phones have. Mostly, though, it’s because I love my Lumia 900 and the 920, with Windows Phone 8, will be even better. Before I got my Lumia 900, I just took it as given that smart phone cameras couldn’t be good. The Lumia taught me that smart phone cameras can be good if the manufacturer treats them as an important component worth spending time and money on (rather than some thing that consumers expect such that they’d better throw one in). I’m extremely pleased with the quality of pictures that my Lumia 900 gives me as well as the range of settings it provides (you can delve in to tell it a film speed, an f-stop, and a whole range of other settings). And the image stabilization features in the Lumia 920 deliver far better results than the others. Nokia has had great maps for a long time and they continue to improve. Even better, they made a deal that puts many of their excellent maps into Windows Phone 8 itself. There are still Nokia-exclusive features such as Nokia City Lens, of course. But by giving the core OS a great set of fundamental map data and technologies, they help ensure that customers know that buying a Windows Phone 8 will give them a great map experience no matter who made the phone. I’ll be getting a 920, myself, but the HTC and Samsung devices that have been announced have some compelling features, too, and it’s great to know that people who buy one of these won’t need to worry about where their maps might lead them. I’m looking forward to the NFC capabilities and Qi wireless charging my Lumia 920 will have. With the availability of DirectX and C++ programming on Windows Phone 8, I’m also excited about all the great games that will be added to the Windows Phone environment. I love my Xbox Phone. I love my Office phone. I love my Facebook phone. I love my GPS phone. I love my camera phone. I love my SkyDrive phone. In short, I love my Windows Phone!

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• Autoscaling in a modern world&hellip;. Part 1

  - by Steve Loethen

  It has been a while since I have had time to sit down and blog.  I need to make sure I take the time.  It helps me to focus on technology and not let the administrivia keep me from doing the things I love. I have been focusing on the cloud for the last couple of years.  Specifically the  PaaS platform from Microsoft called Azure.  Time to dig in.. I wanted to explore Autoscaling.  Autoscaling is not native part of Azure.  The platform has the needed connection points.  You can write code that looks at the health and performance of your application components and react to needed scaling changes.  But that means you have to write all the code.  Luckily, an add on to the Enterprise Library provides a lot of code that gets you a long way to being able to autoscale without having to start from scratch. The tool set is primarily composed of a Autoscaler object that you need to host.  This object, when hosted and configured, looks at the performance criteria you specify and adjusts your application based on your needs.  Sounds perfect. I started with the a set of HOL’s that gave me a good basis to understand the mechanics.  I worked through labs 1 and 2 just to get the feel, but let’s start our saga at the end of lab3.  Lab3 end results in a web application, hosted in Azure and a console app running on premise.  The web app has a few buttons on it.  One set adds messages to a queue, another removes them.  A second set of buttons drives processor utilization to 100%.  If you want to guess, a safe bet is that the Autoscaler is configured to react to a queue that has filled up or high cpu usage.  We will continue our saga in the next post…

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