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• XNA Notes 011

  - by George Clingerman

  Even with a lot of the XNA community working on Dream Build Play entries ( I swear I’m going to finish mine this year!) people are still finding time to do side projects and be amazingly active in the XNA and XBLIG community. With my one eye on my code and one eye on the community, here’s what I noticed these over achievers doing this past week! Time Critical XNA News: Xbox LIVE Indie Games sales data will be delayed March 17-20th due to some schedule maintenance http://create.msdn.com/en-us/news/indie_games_data_delay_march2011 GameMarx is releasing a series of videos to help raise donations for victims of the earthquakes and tsunami in Japan. Help out if you can! http://www.gamemarx.com/video/special/29/help-japan-sushido.aspx XNA MVPs: Catalin Zima shares his thoughts on the MVP summit and my book! http://www.catalinzima.com/2011/03/mvp-summit-2011/ Glenn Wilson (@mykre) helps the XNA team announce some new educational content that you don’t want to miss if you’re porting your app or game to Windows Phone 7 http://www.virtualrealm.com.au/Blog/tabid/62/EntryId/653/Porting-your-App-or-Game-to-Windows-Phone-7.aspx and Windows Phone 7 from scratch http://www.virtualrealm.com.au/Blog/tabid/62/EntryId/654/Windows-Phone-from-Scratch.aspx and shares a link to some free architectural models and textures http://twitter.com/#!/Mykre/status/46410160784158720 George (that’s me!) shares his MVP Summit 2011 summary and XBLIG thoughts http://geekswithblogs.net/clingermangw/archive/2011/03/15/144366.aspx XNA Developers: @SmallCaveGames shares a Code of Ethics for Xbox LIVE Indie Game Developers http://smallcavegames.blogspot.com/2011/03/unofficial-xblig-developers-code-of.html Derek S adds more Xbox LIVE Indie Game studios to his master list of XBLIG links http://twitter.com/#!/Mr_Deeke/status/46140996056125440 http://xbl-indieverse.blogspot.com/p/xblig-links.html Making games and want to help kids? Then share your story with GameFace: America! http://gameitupinitiative.com/about-the-initiative/programs/gameface-america/ Xbox LIVE Indie Games (XBLIG): XonaGames shares some video footage of their booth from GDC 2011 Video 1: http://youtu.be/lxIV9nk3Gq4 Video 2: http://youtu.be/GgfrjqkxR_o Video 3: http://youtu.be/yVcpXrTX7SQ Joystiq on Mommy’s Best Games Serious Sam Double D http://www.joystiq.com/2011/03/16/the-most-important-thing-about-serious-sam-double-d/ And The Escapist recommends that gamers start learning to avoid cleavage now http://www.escapistmagazine.com/news/view/108543-Boobie-Bomber-Makes-First-Appearance-in-Serious-Sam-Double-D Magiko Gaming started a blog on the XBLIG dashboard daily Top 10 games in the US. Good way to go back in time and look at the history of which games were in the the Top 10. http://dailytop10indiegames.wordpress.com/ Where are they going now? XBLIG developers at a crossroads.. http://www.gamesetwatch.com/2011/03/where_are_they_going_now_xblig.php http://www.gamasutra.com/view/news/33527/InDepth_Where_Are_They_Going_Now_XBLIG_Developers_At_A_Crossroads_.php BinaryTweed’s Clover: A Curious Tail is Xbox LIVE’s Deal of the Week! http://www.armlessoctopus.com/2011/03/15/what-luck-clover-a-curious-tale-is-half-price-this-week/ Looking for an Xbox LIVE Indie Game to buy? Writings of Mass Deduction has over 125 suggestions at this point! http://writingsofmassdeduction.com/ SkaStudios shares Vampire Smile Achievements AND their PAX East 2011 Both Setup video http://www.ska-studios.com/2011/03/14/vampire-smile-achievement/ http://www.ska-studios.com/2011/03/15/pax-booth-setup-time-lapse/ MasterBlud and VVGTV starts a new community for XBLIG developers and gamers to join http://vvgtv.forumotion.com/ Raymond Matthews (@DrakstarMatryx) covers Mommy’s Best Games getting Serious http://www.darkstarmatryx.com/?p=286 XNA Development: Dave Henry (@mort8088) posts the 4th tutorial in his series XNA 4.0 SpriteBatch extended http://mort8088.com/2011/03/11/xna-4-0-tutorial-4-spritebatch-extended/ Tutorial 5 - Creating a manual blank texture http://mort8088.com/2011/03/13/xna-4-tutorial-5-manual-blank-texture/ XNA 4.0 Tutorial 6 - Spritesheet Object http://mort8088.com/2011/03/18/xna-4-0-tutorial-6-spritesheet-object/ Jason Mitchell shares a tutorial on setting the alpha value for spritebatch in XNA 4.0 http://www.jason-mitchell.com/index.php/2011/03/13/setting-alpha-value-for-spritebatch-draw-in-xna-4/ XNA for Silverlight Developers: Part 7 - Collision Detection http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-7-Collision-detection.aspx Markus Ewald (@Cygon4) shares the full Ninject 2.0 binding for XNA and Sunburn http://twitter.com/#!/Cygon4/status/48330203826622464 Michael B. McLaughlin shares an AccelerometerInput XNA GameComponent he created (which I’m probably going to snag for a game I’m working on...) http://geekswithblogs.net/mikebmcl/archive/2011/03/17/accelerometerinput-xna-gamecomponent.aspx Extra Credit tackles the building of a good tutorial. Must watch for all Indie game devs (thanks for pointing it out Evan Johnson!) http://twitter.com/#!/johnsonevan/status/48452115680604160 http://www.escapistmagazine.com/videos/view/extra-credits/2921-Tutorials-101 ExEn is fully funded at this point so definitely something for XBLIG developers to keep an eye on as they consider releasing their games on other platforms http://rockethub.com/projects/752-exen-xna-for-iphone-android-and-silverlight Channel 9 and Greg Duncan post Mixing the Game State Management and Platformer XNA Recipes http://channel9.msdn.com/coding4fun/blog/Mixing-the-Game-State-Management-and-Platformer-XNA-Recipes Sgt. Conker has noticed Mike McLaughlin has been crazy productive and has done a recap of his recent posts http://www.sgtconker.com/2011/03/recap-of-mikebmcls-posts/

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• Google I/O 2011: 3D Graphics on Android: Lessons learned from Google Body

  Google I/O 2011: 3D Graphics on Android: Lessons learned from Google Body Nico Weber Google originally built Google Body, a 3D application that renders the human body in incredible detail, for WebGL-capable browsers running on high-end bPCs. To bring the app to Android at a high resolution and frame rate, Nico Weber and Won Chun had a close encounter with Android's graphics stack. In this session Nico will present their findings as best practices for high-end 3D graphics using OpenGL ES 2.0 on Android. The covered topics range from getting accelerated pixels on the screen to fast resource loading, performance guidelines, texture compression, mipmapping, recommended vertex attribute formats, and shader handling. The talk also touches on related topics such as SDK vs NDK, picking, and resource loading. From: GoogleDevelopers Views: 6077 29 ratings Time: 56:09 More in Science & Technology

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• What's a good way to organize samplers for HLSL?

  - by Rei Miyasaka

  According to MSDN, I can have 4096 samplers per context. That's a lot, considering there's only a handful of common sampler states. That tempts me to initialize an array containing a whole bunch of common sampler states, assign them to every device context I use, and then in the pixel shaders refer to them by index using : register(s[n]) where n is the index in the array. If I want more samplers for whatever reason, I can just add them on after the last slot. Does this work? If not, when should I set the samplers? Should it be done when by the mesh renderer? The texture renderer? Or alongside PSSetShader? Edit: That trick I wrote above doesn't work (at least not yet), as the compiler gives me this error message when I try to use the same register twice: error X4500: overlapping register semantics not yet implemented 's0' So how do people usually organize samplers, then?

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• Implementing algorithms via compute shaders vs. pipeline shaders

  - by TravisG

  With the availability of compute shaders for both DirectX and OpenGL it's now possible to implement many algorithms without going through the rasterization pipeline and instead use general purpose computing on the GPU to solve the problem. For some algorithms this seems to become the intuitive canonical solution because they're inherently not rasterization based, and rasterization-based shaders seemed to be a workaround to harness GPU power (simple example: creating a noise texture. No quad needs to be rasterized here). Given an algorithm that can be implemented both ways, are there general (potential) performance benefits over using compute shaders vs. going the normal route? Are there drawbacks that we should watch out for (for example, is there some kind of unusual overhead to switching from/to compute shaders at runtime)? Are there perhaps other benefits or drawbacks to consider when choosing between the two?

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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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• Modelling photo-realistic grass in realtime

  - by sebf

  Hello, I see a number of tutorials on how to create good looking grasses when creating 3D renders but can't think how to model it for realtime/use in a game's scenery. Sure simple models with alpha cutouts can be used to create plants and trees in really awesome scenery but what about a lawn? Are there any good tricks to achieve this effect? I tried with a simple 4 sided box and a small texture and the number of objects needed for a decent appearance made Max crawl to a halt. (I am thinking it may be possible with a shader but that is a whole other area so thought I would just ask about anyones experience with modelling it here) Thanks!

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• Isometric - precise screen coordinates to isometric

  - by Rawrz

  I'm trying to translate mouse coords to precise isometric coords (I can already find the tile the mouse is over, but I want it to be more precise). I've tried several different methods but I seem to keep falling short. For drawing I use: batch.draw( texture, (y * tileWidth / 2) + (x * tileWidth / 2), (x * tileHeight / 2) - (y * tileHeight / 2)) This is what I currently use for figuring out a tile position: float xt = x + camPosition.x - (ScreenWidth/2) ; float yt = (ScreenHeight) - y + camPosition.y - (ScreenHeight/2); int tileY = Math.round((((xt) / tileWidth) - ((yt) / tileHeight))); int tileX = Math.round((((xt) / tileWidth) + ((yt) / tileHeight))- 1); I'm just wondering how I could update these to allow for more precise coordinates, instead of tile only. EDIT: Following what ccxvii said below, and removing the -1 from tileX, the object follows my mouse just like I had wanted. Just going to re-examine the math and figure out if that change will result in other messes =o

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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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• Can GMod/SFM models be converted to Unity GameObjects?

  - by Supuhstar

  Someone made a suite of GMod/SFM models available for free for people making games and videos in GMod and SFM. These are of type .dmx, .dx80.vtx, .dx90.vtx, .mdl, .phy, .sw.vtx, .vvd, .vmt, and .vtf. I fon't use GMod or SFM, so I don't know what these are, thus making it hard for me to manually convert them. Is there any way to change these into files Unity can recognize and use? I'd like to have an easy step from converting them, but I would also accept instructions on how to export them to generic mesh/skeleton/texture files, and then how to import and combine these in Unity.

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• Softbody with complex geometry

  - by philipp

  I have modeled an Handball, based on the tutorial here, with a custom texture. Now I am trying to animate this model with the reactor module as a soft body. Therefor I have watched and tried a lot of tutorials and for animating a simple Sphere everything works fine. But if i try to use the model I have created, than it results in the crash of max or an animation that shows a crystal like structure that transforms itself to another crystal. Is it possible to animate this kind of complex geometry as a soft body and am i just setting the values wrong? If yes, which are the important ones I should check? Thanks in advance! Greetings philipp

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• openGL migration from SFML to glut, vertices arrays or display lists are not displayed

  - by user3714670

  Due to using quad buffered stereo 3D (which i have not included yet), i need to migrate my openGL program from a SFML window to a glut window. With SFML my vertices and display list were properly displayed, now with glut my window is blank white (or another color depending on the way i clear it). Here is the code to initialise the window : int type; int stereoMode = 0; if ( stereoMode == 0 ) type = GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH; else type = GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STEREO; glutInitDisplayMode(type); int argc = 0; char *argv = ""; glewExperimental = GL_TRUE; glutInit(&argc, &argv); bool fullscreen = false; glutInitWindowSize(width,height); int win = glutCreateWindow(title.c_str()); glutSetWindow(win); assert(win != 0); if ( fullscreen ) { glutFullScreen(); width = glutGet(GLUT_SCREEN_WIDTH); height = glutGet(GLUT_SCREEN_HEIGHT); } GLenum err = glewInit(); if (GLEW_OK != err) { fprintf(stderr, "Error: %s\n", glewGetErrorString(err)); } glutDisplayFunc(loop_function); This is the only code i had to change for now, but here is the code i used with sfml and displayed my objects in the loop, if i change the value of glClearColor, the window's background does change color : glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClearColor(255.0f, 255.0f, 255.0f, 0.0f); glLoadIdentity(); sf::Time elapsed_time = clock.getElapsedTime(); clock.restart(); camera->animate(elapsed_time.asMilliseconds()); camera->look(); for (auto i = objects->cbegin(); i != objects->cend(); ++i) (*i)->draw(camera); glutSwapBuffers(); Is there any other changes i should have done switching to glut ? that would be great if someone could enlighten me on the subject. In addition to that, i found out that adding too many objects (that were well handled before with SFML), openGL gives error 1285: out of memory. Maybe this is related. EDIT : Here is the code i use to draw each object, maybe it is the problem : GLuint LightID = glGetUniformLocation(this->shaderProgram, "LightPosition_worldspace"); if(LightID ==-1) cout << "LightID not found ..." << endl; GLuint MaterialAmbientID = glGetUniformLocation(this->shaderProgram, "MaterialAmbient"); if(LightID ==-1) cout << "LightID not found ..." << endl; GLuint MaterialSpecularID = glGetUniformLocation(this->shaderProgram, "MaterialSpecular"); if(LightID ==-1) cout << "LightID not found ..." << endl; glm::vec3 lightPos = glm::vec3(0,150,150); glUniform3f(LightID, lightPos.x, lightPos.y, lightPos.z); glUniform3f(MaterialAmbientID, MaterialAmbient.x, MaterialAmbient.y, MaterialAmbient.z); glUniform3f(MaterialSpecularID, MaterialSpecular.x, MaterialSpecular.y, MaterialSpecular.z); // Get a handle for our "myTextureSampler" uniform GLuint TextureID = glGetUniformLocation(shaderProgram, "myTextureSampler"); if(!TextureID) cout << "TextureID not found ..." << endl; glActiveTexture(GL_TEXTURE0); sf::Texture::bind(texture); glUniform1i(TextureID, 0); // 2nd attribute buffer : UVs GLuint vertexUVID = glGetAttribLocation(shaderProgram, "color"); if(vertexUVID==-1) cout << "vertexUVID not found ..." << endl; glEnableVertexAttribArray(vertexUVID); glBindBuffer(GL_ARRAY_BUFFER, color_array_buffer); glVertexAttribPointer(vertexUVID, 2, GL_FLOAT, GL_FALSE, 0, 0); GLuint vertexNormal_modelspaceID = glGetAttribLocation(shaderProgram, "normal"); if(!vertexNormal_modelspaceID) cout << "vertexNormal_modelspaceID not found ..." << endl; glEnableVertexAttribArray(vertexNormal_modelspaceID); glBindBuffer(GL_ARRAY_BUFFER, normal_array_buffer); glVertexAttribPointer(vertexNormal_modelspaceID, 3, GL_FLOAT, GL_FALSE, 0, 0 ); GLint posAttrib; posAttrib = glGetAttribLocation(shaderProgram, "position"); if(!posAttrib) cout << "posAttrib not found ..." << endl; glEnableVertexAttribArray(posAttrib); glBindBuffer(GL_ARRAY_BUFFER, position_array_buffer); glVertexAttribPointer(posAttrib, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elements_array_buffer); glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0); GLuint error; while ((error = glGetError()) != GL_NO_ERROR) { cerr << "OpenGL error: " << error << endl; } disableShaders();

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• Exporting SWF With Transparent Background For Scaleform/UDK

  - by Alex Shepard

  After looking all over in the UDN and forums I have yet to find a solution for this: I am currently using Flash CS3 and Actionscript 2.0 to build my scaleform menus and I can use them in the UDK. For various reasons I can't use the handy plugin Autodesk supplies to enable this export so I publish my flash documents to swf the old fassioned way and manually use the gfxexport.exe tool to get my .gfx file. I can then import into the UDK the normal way. My problem is that the flash movies that I import will not alpha blend even if the material is set to blend in the alpha channel of the target render texture. My project images are set up to export properly. My classpath for Actionscript 2.0 is set to the correct location. My HTML publish settings have window mode set to Transparent Windowless. Is it possible to export without the scaleform flash extension and still get the desired effects and if so how might I do so? Am I merely missing something from my project setup?

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• What is the most efficient way to blur in a shader?

  - by concernedcitizen

  I'm currently working on screen space reflections. I have perfectly reflective mirror-like surfaces working, and I now need to use a blur to make the reflection on surfaces with a low specular gloss value look more diffuse. I'm having difficulty deciding how to apply the blur, though. My first idea was to just sample a lower mip level of the screen rendertarget. However, the rendertarget uses SurfaceFormat.HalfVector4 (for HDR effects), which means XNA won't allow linear filtering. Point filtering looks horrible and really doesn't give the visual cue that I want. I've thought about using some kind of Box/Gaussian blur, but this would not be ideal. I've already thrashed the texture cache in the raymarching phase before the blur even occurs (a worst case reflection could be 32 samples per pixel), and the blur kernel to make the reflections look sufficiently diffuse would be fairly large. Does anyone have any suggestions? I know it's doable, as Photon Workshop achieved the effect in Unity.

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• Sprite sheets, Clamp or Wrap?

  - by David

  I'm using a combination of sprite sheets for well, sprites and individual textures for infinite tiling. For the tiling textures I'm obviously using Wrap to draw the entire surface in one call but up until now I've been making a seperate batch using Clamp for drawing sprites from the sprite sheets. The sprite sheets include a border (repeating the edge pixels of each sprite) and my code uses the correct source coordinates for sprites. But since I'm never giving coordinates outside of the texture when drawing sprites (and indeed the border exists to prevent bleed over when filtering) it's struck me that I'd be better off just using Wrap so that I can combine everything into one batch. I just want to be sure that I haven't overlooked something obvious. Is there any reason that Wrap would be harmful when used with a sprite sheet?

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• Why would GLCapabilities.setHardwareAccelerated(true/false) have no effect on performance?

  - by Luke

  I've got a JOGL application in which I am rendering 1 million textures (all the same texture) and 1 million lines between those textures. Basically it's a ball-and-stick graph. I am storing the vertices in a vertex array on the card and referencing them via index arrays, which are also stored on the card. Each pass through the draw loop I am basically doing this: gl.glBindBuffer(GL.GL_ARRAY_BUFFER, <buffer id>); gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, <buffer id>); gl.glDrawElements(GL.GL_POINTS, <size>, GL.GL_UNSIGNED_INT, 0); gl.glBindBuffer(GL.GL_ARRAY_BUFFER, <buffer id>); gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, <buffer id>); gl.glDrawElements(GL.GL_LINES, <size>, GL.GL_UNSIGNED_INT, 0); I noticed that the JOGL library is pegging one of my CPU cores. Every frame, the run method internal to the library is taking quite long. I'm not sure why this is happening since I have called setHardwareAccelerated(true) on the GLCapabilities used to create my canvas. What's more interesting is that I changed it to setHardwareAccelerated(false) and there was no impact on the performance at all. Is it possible that my code is not using hardware rendering even when it is set to true? Is there any way to check? EDIT: As suggested, I have tested breaking my calls up into smaller chunks. I have tried using glDrawRangeElements and respecting the limits that it requests. All of these simply resulted in the same pegged CPU usage and worse framerates. I have also narrowed the problem down to a simpler example where I just render 4 million textures (no lines). The draw loop then just doing this: gl.glEnableClientState(GL.GL_VERTEX_ARRAY); gl.glEnableClientState(GL.GL_INDEX_ARRAY); gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); gl.glMatrixMode(GL.GL_MODELVIEW); gl.glLoadIdentity(); <... Camera and transform related code ...> gl.glEnableVertexAttribArray(0); gl.glEnable(GL.GL_TEXTURE_2D); gl.glAlphaFunc(GL.GL_GREATER, ALPHA_TEST_LIMIT); gl.glEnable(GL.GL_ALPHA_TEST); <... Bind texture ...> gl.glBindBuffer(GL.GL_ARRAY_BUFFER, <buffer id>); gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, <buffer id>); gl.glDrawElements(GL.GL_POINTS, <size>, GL.GL_UNSIGNED_INT, 0); gl.glDisable(GL.GL_TEXTURE_2D); gl.glDisable(GL.GL_ALPHA_TEST); gl.glDisableVertexAttribArray(0); gl.glFlush(); Where the first buffer contains 12 million floats (the x,y,z coords of the 4 million textures) and the second (element) buffer contains 4 million integers. In this simple example it is simply the integers 0 through 3999999. I really want to know what is being done in software that is pegging my CPU, and how I can make it stop (if I can). My buffers are generated by the following code: gl.glBindBuffer(GL.GL_ARRAY_BUFFER, <buffer id>); gl.glBufferData(GL.GL_ARRAY_BUFFER, <size> * BufferUtil.SIZEOF_FLOAT, <buffer>, GL.GL_STATIC_DRAW); gl.glVertexAttribPointer(0, 3, GL.GL_FLOAT, false, 0, 0); and: gl.glBindBuffer(GL.GL_ELEMENT_ARRAY_BUFFER, <buffer id>); gl.glBufferData(GL.GL_ELEMENT_ARRAY_BUFFER, <size> * BufferUtil.SIZEOF_INT, <buffer>, GL.GL_STATIC_DRAW); ADDITIONAL INFO: Here is my initialization code: gl.setSwapInterval(1); //Also tried 0 gl.glShadeModel(GL.GL_SMOOTH); gl.glClearDepth(1.0f); gl.glEnable(GL.GL_DEPTH_TEST); gl.glDepthFunc(GL.GL_LESS); gl.glHint(GL.GL_PERSPECTIVE_CORRECTION_HINT, GL.GL_FASTEST); gl.glPointParameterfv(GL.GL_POINT_DISTANCE_ATTENUATION, POINT_DISTANCE_ATTENUATION, 0); gl.glPointParameterfv(GL.GL_POINT_SIZE_MIN, MIN_POINT_SIZE, 0); gl.glPointParameterfv(GL.GL_POINT_SIZE_MAX, MAX_POINT_SIZE, 0); gl.glPointSize(POINT_SIZE); gl.glTexEnvf(GL.GL_POINT_SPRITE, GL.GL_COORD_REPLACE, GL.GL_TRUE); gl.glEnable(GL.GL_POINT_SPRITE); gl.glClearColor(clearColor.getX(), clearColor.getY(), clearColor.getZ(), 0.0f); Also, I'm not sure if this helps or not, but when I drag the entire graph off the screen, the FPS shoots back up and the CPU usage falls to 0%. This seems obvious and intuitive to me, but I thought that might give a hint to someone else.

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• Efficient visualization of a large voxelized volume

  - by Alejandro Piad

  Lets consider a large voxelized volume stored in an oct-tree or any other convenient structure. This volume represents, for instance, a landscape, where each block is either empty (air), or it has an specific material that will be later used to apply a texture. Voxels that are next to each other represent connected sections of the surface. What I need is an algorithm to generate a mesh from this voxels that represents the volume, with the following caracteristics: All the "holes" in the voxelized volume are correct. All the connections are correct, i.e. seamless. The surface appears smooth. In a broad sense, I want to somehow preserve the surface topology, meaning that connected sections remain connected in the resulting mesh and that the surface has a curvature that responds to the voxels topology. Imagine trying to render the Minecraft world but getting the mountain ladders to be smooth instead of blocky.

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• Ios Game with many animated Nodes,performance issues

  - by user31929

  I'm working in a large map upside-down game(not tiled map),the map i use is a city. I have to insert many node to create the "life of the city",something like people that cross the streets,cars,etc... Some of this characters are involved in physics and game logic but others are only graphic characters. For what i know the only way i can achive this result is to create each character node with or without physic body and animate each character with a texture atlas. In this way i think that i'll have many performance problems, (the characters will be something like 100/150) even if i'll apply all the performance tips that i know... My question is: with large numbers of characters there another programming pattern that i must follow ? What is the approch of game like simcity,simpsons tapped out for ios,etc... that have so many animation at the same time?

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• What exactly is UV and UVW Mapping?

  - by Michael Stum

  Trying to understand some basic 3D concepts, at the moment I'm trying to figure out how textures actually work. I know that UV and UVW mapping are techniques that map 2D Textures to 3D Objects - Wikipedia told me as much. I googled for explanations but only found tutorials that assumed that I already know what it is. From my understanding, each 3D Model is made out of Points, and several points create a face? Does each point or face have a secondary coordinate that maps to a x/y position in the 2D Texture? Or how does unwrapping manipulate the model? Also, what does the W in UVW really do, what does it offer over UV? As I understand it, W maps to the Z coordinate, but in what situation would I have different textures for the same X/Y and different Z, wouldn't the Z part be invisible? Or am I completely misunderstanding this?

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• Doing an SNES Mode 7 (affine transform) effect in pygame

  - by 2D_Guy

  Is there such a thing as a short answer on how to do a Mode 7 / mario kart type effect in pygame? I have googled extensively, all the docs I can come up with are dozens of pages in other languages (asm, c) with lots of strange-looking equations and such. Ideally, I would like to find something explained more in English than in mathematical terms. I can use PIL or pygame to manipulate the image/texture, or whatever else is necessary. I would really like to achieve a mode 7 effect in pygame, but I seem close to my wit's end. Help would be greatly appreciated. Any and all resources or explanations you can provide would be fantastic, even if they're not as simple as I'd like them to be. If I can figure it out, I'll write a definitive how to do mode 7 for newbies page. edit: mode 7 doc: http://www.coranac.com/tonc/text/mode7.htm

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• Drawing a textured triangle with CPU instead of GPU

  - by Jenko

  I understand the benefits of GPU rendering and such, but for a certain limited application I need to render textured triangles purely using CPU. I've built a 3D engine capable of object handling, transform, projection, culling and the likes ... now all I need is a little code snippet that draws a single textured triangle onto a bitmap... any language accepted! Inputs: Texture bitmap, Triangle U/V/W coords, Triangle X/Y screen coords Output: The textured triangle drawn at the given screen coords I've currently been using a platform function to draw triangles to screen, but I'm looking to handle it myself to speeden up the process.

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• Is it appropriate for a class to only be a collection of information with no logic?

  - by qegal

  Say I have a class Person that has instance variables age, weight, and height, and another class Fruit that has instance variables sugarContent and texture. The Person class has no methods save setters and getters, while the Fruit class has both setters and getters and logic methods like calculateSweetness. Is the Fruit class the type of class that is better practice than the Person class. What I mean by this is that the Person class seems like it doesn't have much purpose; it exists solely to organize data, while the Fruit class organizes data and actually contains methods for logic.

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• Runescape Private Server - How does it work?

  - by Friend of Kim

  I've seen a lot of Runescape private servers lately. How do they work? Most of them are based on the old Runescape, but a few look exactly like the real Runescape. How do they make the servers? Has the source code of the game been leaked on several occasions, and is that used to make Runescape servers? Or have some people just replicated Runescape, and tried to make the same game themselves (and "stolen" the 3D objects and texture from Jagex to make it look the same, and written the code to be able to replicate most functions of Runescape)?

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• Does md2 support skeletal meshes?

  - by jsvcycling

  I'm creating an FPS game. I'm writing my own game engine. So far all the backend stuff is going great. I'd like to support md2 as the native file format for 3D Objects, but I also want to use skeletal meshes. Does anyone know if the md2 file format supports skeletal meshes? In-case you need to know, I'm going to use blender as my Mesh creation tool and C++ as my programming language... Thanks For got to mention, the engine is based on OpenGL... Alright, for anyone who is reading this, I just found the Doom 3 md5 specifications (http://tfc.duke.free.fr/coding/md5-specs-en.html). It gives you some help on writing a parser (see bottom of link), but the example doesn't support lighting and texture mapping (the second set of example code allows for animation). Thanks @Neverender for answering my question...

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• General visual effects to meshes/entities

  - by Pacha

  I am trying to add some visual effects to some entities, meshes, or whatever you want to call them as they are looking pretty dull in my game right now. What I want to achieve is this: http://youtu.be/zox8935PLw0?t=36s (the "texture" gets disintegrated and then goes back to normal, covering the whole mesh.) Also I would like to know what is the best way to add effects like the one in the video to my game (for example, thunder effects, shattering, etc.) I know that I can do some things with shaders, but I haven't learned them too well and I am still in a beginner level. I am using Ogre3D, and GLSL for shaders. Thanks! Note: this is a screen-shot of my game, I want to apply the effect in the video to my main character):

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• Tools for assembling textures into DDS files

  - by Nicol Bolas

  There are plenty of tools for making images. I'm not looking for one of those; I have many tools for creating an image. I've got tools for compressing images, generating mipmaps, and even for poking at their basic data format. My issue is with texture assembly. DDS files support cubemaps, array textures, and even cubemap arrays. But I don't know of a tool that can pack a series of images into a cubemap or the like. What tools are available for doing this kind of thing?

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