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  • Align tetrahedrons

    - by thedeadlybutter
    I'm currently generating tetrahedron meshes in Unity When a player clicks the side of a mesh, a new one spawns aligned with it, like this. I'm not sure how nor can I find any information on implementing a tetra hedron grid. I tried playing around with the vertices until I realized I need to adjust position & rotation. Any ideas? EDIT: To be clear, the second image was manually placed objects in the Unity Editor. I'm looking to make an algorithm that places the meshes correctly.

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  • how to retain the animated position in opengl es 2.0

    - by Arun AC
    I am doing frame based animation for 300 frames in opengl es 2.0 I want a rectangle to translate by +200 pixels in X axis and also scaled up by double (2 units) in the first 100 frames Then, the animated rectangle has to stay there for the next 100 frames. Then, I want the same animated rectangle to translate by +200 pixels in X axis and also scaled down by half (0.5 units) in the last 100 frames. I am using simple linear interpolation to calculate the delta-animation value for each frame. Pseudo code: The below drawFrame() is executed for 300 times (300 frames) in a loop. float RectMVMatrix[4][4] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 }; // identity matrix int totalframes = 300; float translate-delta; // interpolated translation value for each frame float scale-delta; // interpolated scale value for each frame // The usual code for draw is: void drawFrame(int iCurrentFrame) { // mySetIdentity(RectMVMatrix); // comment this line to retain the animated position. mytranslate(RectMVMatrix, translate-delta, X_AXIS); // to translate the mv matrix in x axis by translate-delta value myscale(RectMVMatrix, scale-delta); // to scale the mv matrix by scale-delta value ... // opengl calls glDrawArrays(...); eglswapbuffers(...); } The above code will work fine for first 100 frames. in order to retain the animated rectangle during the frames 101 to 200, i removed the "mySetIdentity(RectMVMatrix);" in the above drawFrame(). Now on entering the drawFrame() for the 2nd frame, the RectMVMatrix will have the animated value of first frame e.g. RectMVMatrix[4][4] = { 1.01, 0, 0, 2, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 };// 2 pixels translation and 1.01 units scaling after first frame This RectMVMatrix is used for mytranslate() in 2nd frame. The translate function will affect the value of "RectMVMatrix[0][0]". Thus translation affects the scaling values also. Eventually output is getting wrong. How to retain the animated position without affecting the current ModelView matrix? =========================================== I got the solution... Thanks to Sergio. I created separate matrices for translation and scaling. e.g.CurrentTranslateMatrix[4][4], CurrentScaleMatrix[4][4]. Then for every frame, I reset 'CurrentTranslateMatrix' to identity and call mytranslate( CurrentTranslateMatrix, translate-delta, X_AXIS) function. I reset 'CurrentScaleMatrix' to identity and call myscale(CurrentScaleMatrix, scale-delta) function. Then, I multiplied these 'CurrentTranslateMatrix' and 'CurrentScaleMatrix' to get the final 'RectMVMatrix' Matrix for the frame. Pseudo Code: float RectMVMatrix[4][4] = {0}; float CurrentTranslateMatrix[4][4] = {0}; float CurrentScaleMatrix[4][4] = {0}; int iTotalFrames = 300; int iAnimationFrames = 100; int iTranslate_X = 200.0f; // in pixels float fScale_X = 2.0f; float scaleDelta; float translateDelta_X; void DrawRect(int iTotalFrames) { mySetIdentity(RectMVMatrix); for (int i = 0; i< iTotalFrames; i++) { DrawFrame(int iCurrentFrame); } } void getInterpolatedValue(int iStartFrame, int iEndFrame, int iTotalFrame, int iCurrentFrame, float *scaleDelta, float *translateDelta_X) { float fDelta = float ( (iCurrentFrame - iStartFrame) / (iEndFrame - iStartFrame)) float fStartX = 0.0f; float fEndX = ConvertPixelsToOpenGLUnit(iTranslate_X); *translateDelta_X = fStartX + fDelta * (fEndX - fStartX); float fStartScaleX = 1.0f; float fEndScaleX = fScale_X; *scaleDelta = fStartScaleX + fDelta * (fEndScaleX - fStartScaleX); } void DrawFrame(int iCurrentFrame) { getInterpolatedValue(0, iAnimationFrames, iTotalFrames, iCurrentFrame, &scaleDelta, &translateDelta_X) mySetIdentity(CurrentTranslateMatrix); myTranslate(RectMVMatrix, translateDelta_X, X_AXIS); // to translate the mv matrix in x axis by translate-delta value mySetIdentity(CurrentScaleMatrix); myScale(RectMVMatrix, scaleDelta); // to scale the mv matrix by scale-delta value myMultiplyMatrix(RectMVMatrix, CurrentTranslateMatrix, CurrentScaleMatrix);// RectMVMatrix = CurrentTranslateMatrix*CurrentScaleMatrix; ... // opengl calls glDrawArrays(...); eglswapbuffers(...); } I maintained this 'RectMVMatrix' value, if there is no animation for the current frame (e.g. 101th frame onwards). Thanks, Arun AC

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  • Virtual Economy Setup - Virtual currencies advice

    - by Sarah Simpson
    I'm trying to figure out how to build my virtual economy. It seems like some games have one currency and some of them have up to 3 and 4 different ones. The game is an action game which is currently single player but I'm planning on adding a tournament mode that allows users to compete against each other. The virtual goods that a user would be able to purchase would be either customization to the character or powerups and utilities that give the character more abilities in the game. The character is able to gain coins during game play. The advice I'm trying to get is whether or not it makes sense to set up more than one currency and more than two currencies? What are the pros and cons? Reference to some resources that indicate research would be great.

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  • Are there existing FOSS component-based frameworks?

    - by Tesserex
    The component based game programming paradigm is becoming much more popular. I was wondering, are there any projects out there that offer a reusable component framework? In any language, I guess I don't care about that. It's not for my own project, I'm just curious. Specifically I mean are there projects that include a base Entity class, a base Component class, and maybe some standard components? It would then be much easier starting a game if you didn't want to reinvent the wheel, or maybe you want a GraphicsComponent that does sprites with Direct3D, but you figure it's already been done a dozen times. A quick Googling turns up Rusher. Has anyone heard of this / does anyone use it? If there are no popular ones, then why not? Is it too difficult to make something like this reusable, and they need heavy customization? In my own implementation I found a lot of boilerplate that could be shoved into a framework.

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  • Any 3D, Isometric, RPG oriented engines?

    - by Don Quixote
    I was wondering if there are any game engines out there that are oriented towards isometric, 3D RPGs such as Diablo 3, Torchlight, Magika, etc.. Most engines I found so far are either oriented towards FPS, such as Cry Engine and UDK, or are far too generic, such as the Irrlicht engine, which will add what I think is unnecessary work on the engine instead of the game. Any chance there are any engines out there that are crafted to be more suitable for RPGs? I would prefer they be in Java, since it's more my forte, but beggars can't be choosers, so C++ is great as well! Thank you.

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  • LIBGDX "parsing error emitter" with 2 or more emitters [on hold]

    - by flow969
    I have a problem with the use of particle effect of LIBGDX with 2 or more emitters. After using ParticleEditor to create my .p file, I use it in my code BUT...when I use only 1 emitter it's fine but with more than 1, not fine ! :( Here is my error code in java console : Exception in thread "LWJGL Application" java.lang.RuntimeException: Error parsing emitter: - Delay - at com.badlogic.gdx.graphics.g2d.ParticleEmitter.load(ParticleEmitter.java:910) at com.badlogic.gdx.graphics.g2d.ParticleEmitter.<init>(ParticleEmitter.java:95) at com.badlogic.gdx.graphics.g2d.ParticleEffect.loadEmitters(ParticleEffect.java:154) at com.badlogic.gdx.graphics.g2d.ParticleEffect.load(ParticleEffect.java:138) at com.fasgame.fishtrip.android.screens.GameScreen.show(GameScreen.java:313) at com.badlogic.gdx.Game.setScreen(Game.java:61) at com.fasgame.fishtrip.android.screens.MainMenuScreen.render(MainMenuScreen.java:71) at com.badlogic.gdx.Game.render(Game.java:46) at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:206) at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:114) Caused by: java.lang.NumberFormatException: For input string: "- Count -" at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source) at sun.misc.FloatingDecimal.parseFloat(Unknown Source) at java.lang.Float.parseFloat(Unknown Source) at com.badlogic.gdx.graphics.g2d.ParticleEmitter.readFloat(ParticleEmitter.java:929) at com.badlogic.gdx.graphics.g2d.ParticleEmitter$RangedNumericValue.load(ParticleEmitter.java:1062) at com.badlogic.gdx.graphics.g2d.ParticleEmitter.load(ParticleEmitter.java:866) ... 9 more And here is my particle effect .p file : Blanc - Delay - active: false - Duration - lowMin: 3000.0 lowMax: 3000.0 - Count - min: 0 max: 200 - Emission - lowMin: 0.0 lowMax: 0.0 highMin: 250.0 highMax: 250.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Life - lowMin: 500.0 lowMax: 500.0 highMin: 500.0 highMax: 500.0 relative: false scalingCount: 3 scaling0: 1.0 scaling1: 0.47058824 scaling2: 0.0 timelineCount: 3 timeline0: 0.0 timeline1: 0.51369864 timeline2: 1.0 - Life Offset - active: false - X Offset - active: false - Y Offset - active: false - Spawn Shape - shape: point - Spawn Width - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Spawn Height - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Scale - lowMin: 0.0 lowMax: 0.0 highMin: 70.0 highMax: 70.0 relative: true scalingCount: 2 scaling0: 1.0 scaling1: 0.0 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Velocity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 30.0 highMax: 300.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Angle - active: true lowMin: 220.0 lowMax: 320.0 highMin: 220.0 highMax: 320.0 relative: false scalingCount: 2 scaling0: 0.0 scaling1: 0.98039216 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Rotation - active: false - Wind - active: false - Gravity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Tint - colorsCount: 3 colors0: 0.50980395 colors1: 0.7647059 colors2: 0.7921569 timelineCount: 1 timeline0: 0.0 - Transparency - lowMin: 0.0 lowMax: 0.0 highMin: 1.0 highMax: 1.0 relative: false scalingCount: 4 scaling0: 1.0 scaling1: 1.0 scaling2: 1.0 scaling3: 1.0 timelineCount: 4 timeline0: 0.0 timeline1: 0.36301368 timeline2: 0.6164383 timeline3: 1.0 - Options - attached: false continuous: true aligned: false additive: true behind: false premultipliedAlpha: false pre_particle.png Bleu - Delay - active: false - Duration - lowMin: 3000.0 lowMax: 3000.0 - Count - min: 0 max: 200 - Emission - lowMin: 0.0 lowMax: 0.0 highMin: 250.0 highMax: 250.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Life - lowMin: 500.0 lowMax: 500.0 highMin: 500.0 highMax: 500.0 relative: false scalingCount: 3 scaling0: 1.0 scaling1: 0.47058824 scaling2: 0.0 timelineCount: 3 timeline0: 0.0 timeline1: 0.51369864 timeline2: 1.0 - Life Offset - active: false - X Offset - active: false - Y Offset - active: false - Spawn Shape - shape: point - Spawn Width - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Spawn Height - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Scale - lowMin: 0.0 lowMax: 0.0 highMin: 70.0 highMax: 70.0 relative: true scalingCount: 2 scaling0: 1.0 scaling1: 0.0 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Velocity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 30.0 highMax: 300.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Angle - active: true lowMin: 220.0 lowMax: 320.0 highMin: 220.0 highMax: 320.0 relative: false scalingCount: 2 scaling0: 0.0 scaling1: 0.98039216 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Rotation - active: false - Wind - active: false - Gravity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Tint - colorsCount: 3 colors0: 0.0 colors1: 0.7254902 colors2: 0.7921569 timelineCount: 1 timeline0: 0.0 - Transparency - lowMin: 0.0 lowMax: 0.0 highMin: 1.0 highMax: 1.0 relative: false scalingCount: 6 scaling0: 0.0 scaling1: 1.0 scaling2: 1.0 scaling3: 1.0 scaling4: 1.0 scaling5: 0.0 timelineCount: 6 timeline0: 0.0 timeline1: 0.047945205 timeline2: 0.34246576 timeline3: 0.6712329 timeline4: 0.94520545 timeline5: 1.0 - Options - attached: false continuous: true aligned: false additive: true behind: false premultipliedAlpha: false pre_particle.png BleuFonce - Delay - active: false - Duration - lowMin: 3000.0 lowMax: 3000.0 - Count - min: 0 max: 200 - Emission - lowMin: 0.0 lowMax: 0.0 highMin: 250.0 highMax: 250.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Life - lowMin: 500.0 lowMax: 500.0 highMin: 500.0 highMax: 500.0 relative: false scalingCount: 3 scaling0: 1.0 scaling1: 0.47058824 scaling2: 0.0 timelineCount: 3 timeline0: 0.0 timeline1: 0.51369864 timeline2: 1.0 - Life Offset - active: false - X Offset - active: false - Y Offset - active: false - Spawn Shape - shape: point - Spawn Width - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Spawn Height - lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Scale - lowMin: 0.0 lowMax: 0.0 highMin: 70.0 highMax: 70.0 relative: true scalingCount: 2 scaling0: 1.0 scaling1: 0.0 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Velocity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 30.0 highMax: 300.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Angle - active: true lowMin: 220.0 lowMax: 320.0 highMin: 220.0 highMax: 320.0 relative: false scalingCount: 2 scaling0: 0.0 scaling1: 0.98039216 timelineCount: 2 timeline0: 0.0 timeline1: 1.0 - Rotation - active: false - Wind - active: false - Gravity - active: true lowMin: 0.0 lowMax: 0.0 highMin: 0.0 highMax: 0.0 relative: false scalingCount: 1 scaling0: 1.0 timelineCount: 1 timeline0: 0.0 - Tint - colorsCount: 3 colors0: 0.0 colors1: 0.7294118 colors2: 1.0 timelineCount: 1 timeline0: 0.0 - Transparency - lowMin: 0.0 lowMax: 0.0 highMin: 1.0 highMax: 1.0 relative: false scalingCount: 4 scaling0: 1.0 scaling1: 0.0 scaling2: 0.0 scaling3: 1.0 timelineCount: 4 timeline0: 0.0 timeline1: 0.001 timeline2: 0.5753425 timeline3: 0.79452056 - Options - attached: false continuous: true aligned: false additive: true behind: false premultipliedAlpha: false pre_particle.png For the "- Image Path -" missing it's normal if I let them in it doesn't work even with only 1 emitter PS : I've already updated my lib to the last release

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  • Distance between two 3D objects' faces

    - by Arthur Gibraltar
    I'm really newbie on programming and I'm making some tests. I couldn't find nowhere on Internet how could I calculate the distance between two 3D objects' faces. Is there anyway? Detailing, as an example, I have two 3D cubes. Each one has a vector3 position designating it's center on the 3D space and an orientation matrix. And each cube has a size (float width, float height and float length). I could get a simple distance between them by calling Vector3.Distance(), but it doesn't consider its sizes, just the position. Then the distance would be between its centers. Is there any way to calculate the distance between the faces? Thanks for any reply.

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  • How do I generate a level randomly?

    - by Charlton Santana
    I am currently hard coding 10 different instances like the code below, but but I'd like to create many more. Instead of having the same layout for the new level, I was wondering if there is anyway to generate a random X value for each block (this will be how far into the level it is). A level 100,000 pixels wide would be good enough but if anyone knows a system to make the level go on and on, I'd like to know that too. This is basically how I define a block now (with irrelevant code removed): block = new Block(R.drawable.block, 400, platformheight); block2 = new Block(R.drawable.block, 600, platformheight); block3 = new Block(R.drawable.block, 750, platformheight); The 400 is the X position, which I'd like to place randomly through the level, the platformheight variable defines the Y position which I don't want to change.

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  • The practical cost of swapping effects

    - by sebf
    I use XNA for my projects and on those forums I sometimes see references to the fact that swapping an effect for a mesh has a relatively high cost, which surprises me as I thought to swap an effect was simply a case of copying the replacement shader program to the GPU along with appropriate parameters. I wondered if someone could explain exactly what is costly about this process? And put, if possible, 'relatively' into context? For example say I wanted to use a short shader to help with picking, I would: Change the effect on every object, calculting a unique color to identify it and providing it to the shader. Draw all the objects to a render target in memory. Get the color from the target and use it to look up the selected object. What portion of the total time taken to complete that process would be spent swapping the shaders? My instincts would say that rendering the scene again, no matter how simple the shader, would be an order of magnitude slower than any other part of the process so why all the concern over effects?

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  • Detect collision from a particular side

    - by Fabián
    I'm making a platform sidescrolling game. All I want to do is to detect if my character is on the floor: function OnCollisionStay (col : Collision){ if(col.gameObject.tag == "Floor"){ onFloor = true; } else {onFloor = false;} } function OnCollisionExit (col : Collision){ onFloor = false; } But I know this isn't the accurate way. If I hit a cube with a "floor" tag, in the air (no matter if with the character's feet or head) I would be able to jump. Is there a way to use the same box collision to detect if I'm touching something from a specific side?

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  • Collision detection in 3D space

    - by dreta
    I've got to write, what can be summed up as, a compelte 3D game from scratch this semester. Up untill now i have only programmed 2D games in my spare time, the transition doesn't seem tough, the game's simple. The only issue i have is collision detection. The only thing i could find was AABB, bounding spheres or recommendations of various physics engines. I have to program a submarine that's going to be moving freely inside of a cave system, AFAIK i can't use physics libraries, so none of the above solves my problem. Up untill now i was using SAT for my collision detection. Are there any similar, great algorithms, but crafted for 3D collision? I'm not talking about octrees, or other optimalizations, i'm talking about direct collision detection of one set of 3D polygons with annother set of 3D polygons. I thought about using SAT twice, project the mesh from the top and the side, but then it seems so hard to even divide 3D space into convex shapes. Also that seems like far too much computation even with octrees. How do proffessionals do it? Could somebody shed some light.

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  • Can't read .cso files but I can read their .hlsl versions?

    - by Jader J Rivera
    Well I've been trying to read a .cso file to use as a shader for a DirectX program I'm currently making. Problem is no matter how I implemented a way to read the file it never worked. And after fidgeting around I discover that it's only the .cso files I can't read. I can read anything else (which means it works) even their .hlsl files. Which is strange because the .hlsl (high level shader language) files are supposed to turn into .cso (compiled shader object) files. What I'm currently doing is: vector<byte> Read(string File){ vector<byte> Text; fstream file(File, ios::in | ios::ate | ios::binary); if(file.is_open()){ Text.resize(file.tellg()); file.seekg(0 , ios::beg); file.read(reinterpret_cast<char*>(&Text[0]), Text.size()); file.close(); } return Text; }; If I then implement it. Read("VertexShader.hlsl"); //Works Read("VertexShader.cso"); //Doesn't Works?!?! And I need the .cso version of the shader to draw my sexy triangles. Without it my life and application will never continue and I have no idea what could be wrong. (I've also asked this at stack overflow but still no answers.)

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  • Why does glGetString returns a NULL string

    - by snape
    I am trying my hands at GLFW library. I have written a basic program to get OpenGL renderer and vendor string. Here is the code #include <GL/glew.h> #include <GL/glfw.h> #include <cstdio> #include <cstdlib> #include <string> using namespace std; void shutDown(int returnCode) { printf("There was an error in running the code with error %d\n",returnCode); GLenum res = glGetError(); const GLubyte *errString = gluErrorString(res); printf("Error is %s\n", errString); glfwTerminate(); exit(returnCode); } int main() { // start GL context and O/S window using GLFW helper library if (glfwInit() != GL_TRUE) shutDown(1); if (glfwOpenWindow(0, 0, 0, 0, 0, 0, 0, 0, GLFW_WINDOW) != GL_TRUE) shutDown(2); // start GLEW extension handler glewInit(); // get version info const GLubyte* renderer = glGetString (GL_RENDERER); // get renderer string const GLubyte* version = glGetString (GL_VERSION); // version as a string printf("Renderer: %s\n", renderer); printf("OpenGL version supported %s\n", version); // close GL context and any other GLFW resources glfwTerminate(); return 0; } I googled this error and found out that we have to initialize the OpenGL context before calling glGetString(). Although I have initialized OpenGL context using glfwInit() but still the function returns a NULL string. Any ideas? Edit I have updated the code with error checking mechanisms. This code on running outputs the following There was an error in running the code with error 2 Error is no error

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  • How AlphaBlend Blendstate works in XNA 4 when accumulighting light into a RenderTarget?

    - by cubrman
    I am using a Deferred Rendering engine from Catalin Zima's tutorial: His lighting shader returns the color of the light in the rgb channels and the specular component in the alpha channel. Here is how light gets accumulated: Game.GraphicsDevice.SetRenderTarget(LightRT); Game.GraphicsDevice.Clear(Color.Transparent); Game.GraphicsDevice.BlendState = BlendState.AlphaBlend; // Continuously draw 3d spheres with lighting pixel shader. ... Game.GraphicsDevice.BlendState = BlendState.Opaque; MSDN states that AlphaBlend field of the BlendState class uses the next formula for alphablending: (source × Blend.SourceAlpha) + (destination × Blend.InvSourceAlpha), where "source" is the color of the pixel returned by the shader and "destination" is the color of the pixel in the rendertarget. My question is why do my colors are accumulated correctly in the Light rendertarget even when the new pixels' alphas equal zero? As a quick sanity check I ran the following code in the light's pixel shader: float specularLight = 0; float4 light4 = attenuation * lightIntensity * float4(diffuseLight.rgb,specularLight); if (light4.a == 0) light4 = 0; return light4; This prevents lighting from getting accumulated and, subsequently, drawn on the screen. But when I do the following: float specularLight = 0; float4 light4 = attenuation * lightIntensity * float4(diffuseLight.rgb,specularLight); return light4; The light is accumulated and drawn exactly where it needs to be. What am I missing? According to the formula above: (source x 0) + (destination x 1) should equal destination, so the "LightRT" rendertarget must not change when I draw light spheres into it! It feels like the GPU is using the Additive blend instead: (source × Blend.One) + (destination × Blend.One)

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  • Get Specific depth values in Kinect (XNA)

    - by N0xus
    I'm currently trying to make a hand / finger tracking with a kinect in XNA. For this, I need to be able to specify the depth range I want my program to render. I've looked about, and I cannot see how this is done. As far as I can tell, kinect's depth values only work with pre-set ranged found in the depthStream. What I would like to do is make it modular so that I can change the depth range my kinect renders. I know this has been down before but I can't find anything online that can show me how to do this. Could someone please help me out? I have made it possible to render the standard depth view with the kinect, and the method that I have made for converting the depth frame is as follows (I've a feeling its something in here I need to set) private byte[] ConvertDepthFrame(short[] depthFrame, DepthImageStream depthStream, int depthFrame32Length) { int tooNearDepth = depthStream.TooNearDepth; int tooFarDepth = depthStream.TooFarDepth; int unknownDepth = depthStream.UnknownDepth; byte[] depthFrame32 = new byte[depthFrame32Length]; for (int i16 = 0, i32 = 0; i16 < depthFrame.Length && i32 < depthFrame32.Length; i16++, i32 += 4) { int player = depthFrame[i16] & DepthImageFrame.PlayerIndexBitmask; int realDepth = depthFrame[i16] >> DepthImageFrame.PlayerIndexBitmaskWidth; // transform 13-bit depth information into an 8-bit intensity appropriate // for display (we disregard information in most significant bit) byte intensity = (byte)(~(realDepth >> 8)); if (player == 0 && realDepth == 00) { // white depthFrame32[i32 + RedIndex] = 255; depthFrame32[i32 + GreenIndex] = 255; depthFrame32[i32 + BlueIndex] = 255; } // omitted other if statements. Simple changed the color of the pixels if they went out of the pre=set depth values else { // tint the intensity by dividing by per-player values depthFrame32[i32 + RedIndex] = (byte)(intensity >> IntensityShiftByPlayerR[player]); depthFrame32[i32 + GreenIndex] = (byte)(intensity >> IntensityShiftByPlayerG[player]); depthFrame32[i32 + BlueIndex] = (byte)(intensity >> IntensityShiftByPlayerB[player]); } } return depthFrame32; } I have a strong hunch it's something I need to change in the int player and int realDepth values, but i can't be sure.

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  • How should I show shared resources during a Shared Resource game in the Galaxy Editor?

    - by Mag Roader
    One of my favorite ways to play the original StarCraft was in a "Team" game. In this game type, multiple players on the same "team" would share control, resources, supply, and even the same starting location. It was like playing as 1 player, only 2 humans were controlling it. It was a lot of fun. I want to do something very similar in StarCraft 2, but I need to create a custom map in the Galaxy Editor to do it. I found the editor can quite easily emulate this behavior. There is a Trigger action "Set Alliance for Player Group" to "...treat each other as Ally With Shared Vision, Control, And Spending." To use this, I create units for only 1 of the players, and then set all players to be allied with each other in this way. All the other players get no units and no resources. This makes it so 1 player is the actual owner of all the units and everyone else is tagging along with full control. This nearly works! The problem is that if I am not the actual owning player, I can't actually see how many minerals/gas/supply the team has. This makes it pretty difficult to build stuff. What would be the best way to display to the other players how many Minerals/Gas/Supply the team has?

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  • Sound not playing on Windows XP - SoundEffect or Song: Monogame

    - by ashes999
    I'm trying to integrate sound into my Monogame game. I don't have the content pipeline hack -- just straight Monogame (Beta 3) at this point. (I tried adding the content pipeline, but ran into some issues.) I added a .wav file to my /Content directory, and I can create and instantiate both SoundEffect and Song classes. However, both show durations of 00:00:00 (on a ten-second long file), and neither plays. I can call LoadContent without any issue. But when I call Play, nothing plays. I've tried a couple of different sounds, and different formats (MP3 and WAV) to rule that out. Only WAV seems to even load without crashing out, but it doesn't play. There seems to be a GitHub issue that fixes this problem in 2.5.1. Downgrading to 2.5.1 doesn't fix this problem; it seems like it's fixed in 3.0 (_data is set in the SoundEffect instance). This issue only occurs on Windows XP. I tested it on a Windows 7 laptop, and the sound plays fine.

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  • Does use of simple shaders improve performace/battery life?

    - by Miro
    I'm making OpenGL game for Android. Till now i've used only fixed function pipeline, but i'm rendering simple things. Fixed function pipeline includes a lot of stuff i don't need. So i'm thinking about implementing shaders in my game to simplify OpenGL pipeline if it can make better performance. Better performance = better battery life, unless fps is limited by software limit, not hardware power.

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  • Dynamic Dijkstra

    - by Dani
    I need dynamic dijkstra algorithm that can update itself when edge's cost is changed without a full recalculation. Full recalculation is not an option. I've tryed to "brew" my own implemantion with no success. I've also tryed to find on the Internet but found nothing. A link to an article explaining the algorithm or even it's name will be good. Edit: Thanks everyone for answering. I managed to make algorithm of my own that runs in O(V+E) time, if anyone wishes to know the algorithm just say so and I will post it.

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  • How was collision detection handled in The Legend of Zelda: A Link to the Past?

    - by Restart
    I would like to know how the collision detection was done in The Legend of Zelda: A Link To The Past. The game is 16x16 tile based, so how did they do the tiles where only a quarter or half of the tile is occupied? Did they use a smaller grid for collision detection like 8x8 tiles, so four of them make one 16x16 tile of the texture grid? But then, they also have true half tiles which are diagonally cut and the corners of the tiles seem to be round or something. If Link walks into tiles corner he can keep on walking and automatically moves around it's corner. How is that done? I hope someone can help me out here.

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  • Microsoft dévoile la feuille de route de ses produits d'administration, et présente sa solution clou

    Microsoft dévoile la feuille de route de ses produits d'administration, et présente sa solution cloud Windows Intune Le Microsoft Management Summit a actuellement lieu à Las Vegas. Il s'y déroule du 19 au 23 Avril et permet de faire le point sur les produits d'administration de la firme de Redmond. Mardi, Microsoft y a dévoilé la feuille de route de ses produits d'administration avant de présenter Windows Intune : une solution « in the Cloud » pour administrer les postes de travail. Retrouvez tous les détails sur ces deux nouvelles dans le communiqué de presse que nous a fait parvenir le service de presse de Microsoft France : ...

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  • Should I make the Cells in a Tiledmap as null when my player hits it

    - by Vishal Kumar
    I am making a Tile Based game using Libgdx. I took the idea from SuperKoalio platformer demo by Mario Zencher. When I wanted to implement Collectables in my game , I simply draw the coins using Tiled Map Editor. When my player hits that, I use to set that cell as null. Someday on this site suggested me not to do so... never use null. I agreed. What can be any other way. If I am using layer.setCell(x,y) to set the cell to any other cell... even if an transparent one .. my player seems to be stopped by an invisible object/hurdle. This is my code: for (Rectangle tile : tiles) { if (koalaRect.overlaps(tile)) { TiledMapTileLayer layer = (TiledMapTileLayer) map.getLayers().get(1); try{ type = layer.getCell((int) tile.x, (int) tile.y).getTile().getProperties().get("tileType").toString(); } catch(Exception e){ System.out.print("Exception in Tiles Property"+e); type="nonbreakable"; } //Let us destroy this cell if(("award".equals(type))){ layer.setCell((int) tile.x, (int) tile.y, null); listener.coin(); score+=100; test = ""+layer.getCell(0, 0).getTile().getProperties().get("tileType"); } //DOING THIS GIVES A BAD EFFECT if(("killer".equals(type))){ //player.health--; //layer.setCell((int) tile.x, (int) tile.y, layer.getCell(20,0)); } // we actually reset the player y-position here // so it is just below/above the tile we collided with // this removes bouncing :) if (player.velocity.y > 0) { player.position.y = (tile.y - Player.height); } Is this a right approach? OR I should create separate Sprite Class called Coin.

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  • How can I dynamically load the correct sprite from a sprite sheet?

    - by Leonard Challis
    I am making a simple card game in unity. The game is based on a standard 52-card pack, with identical backs for unique faces. In my particular game different cards are worth different values and have various special abilities. The game will have 52 cards on the table (on the draw position or in the face-down deck or in someone's hand) at all times, so this number won't change. I thought that making a Card prefab and instantiating 52 of these manually would be a bad idea. Even doing it in code, I thought, would be a bit OTT, and that I should just instantiate visual cards when they are face-up to the player. I have a sprite sheet of the 52 cards and the back, which is imported as a Sprite in multiple mode, sliced in to a grid containing all the cards needed to play the game. The problem I now face is that, through my GameController script I want to generate a shuffled pack of cards, deal some to each player and then show those cards to a player. However, I am not sure of the best way, or even if it's possible, to do this dynamically with the sprite sheets as they are. For instance if I have the following: private CardRank rank; private CardSuite suite; private void Start() { this.rank = CardRank.Ace; this.suite = CardSuite.Spades; } This class would be instantiated by the game manager. I would have 52 of these in code. Whenever I have to visually show a card in the scene, I would use a card prefab, which is essentially a game object with a SpriteRenderer on it. I would need to dynamically load the correct sprite for this object from the spritesheet. The sliced sprites from the sprite sheet actually have names in the format AS (Ace of Spades), 7H (Seven of Hearts), etc - though this was a manual thing I did myself of course. I have also tried various alternative solutions, including creating animations, having separate sprites not in a spritesheet and having an array of available sprites in an array with a specific index for each card, but none seem as elegant as trying to load the correct sprite at runtime, as I'm trying to. So, how do I load a specific sprite from a spritesheet at runtime? I'm open to suggestions, even those that make me think differently about how to approach the problem.

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  • Can I become a Game Designer? [on hold]

    - by user32721
    This is my first time posting something on a forum in 4 years. I am posting this because I want to adjust my expectations and goals regarding game design. I am in college in Morocco (Al Akhawayn university). just started my junior year. I am a communications major (school of humanities) and a gender studies minor. I want to become a video game designer. It is the only career that I am interested in. I have been playing ever since I was 5 and haven't stopped yet. Currently I don't have any noteworthy skills to become a designer. I don't know how to program (don't really have the patience for it) and I can't draw to save my life. I haven't tried visual software like MAYA or MAX so I can't comment on graphic design. So I basically want to know whether my current education is capable of helping me reach my goal. If not then should I take a master's in game design (in the U.S?) or switch my minor to computer science? I am sorry that this post is long! I look forward to hearing your advice!

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  • When does depth testing happen?

    - by Utkarsh Sinha
    I'm working with 2D sprites - and I want to do 3D style depth testing with them. When writing a pixel shader for them, I get access to the semantic DEPTH0. Would writing to this value help? It seems it doesn't. Maybe it's done before the pixel shader step? Or is depth testing only done when drawing 3D things (I'm using SpriteBatch)? Any links/articles/topics to read/search for would be appreciated.

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