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  • Bitwise operators in DX9 ps_2_0 shader

    - by lapin
    I've got the following code in a shader: // v & y are both floats nPixel = v; nPixel << 8; nPixel |= y; and this gives me the following error in compilation: shader.fx(80,10): error X3535: Bitwise operations not supported on legacy targets. shader.fx(92,18): ID3DXEffectCompiler::CompileEffect: There was an error compiling expression ID3DXEffectCompiler: Compilation failed The error is on the following line: nPixel |= y; What am I doing wrong here?

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  • HTML5/JS - Choppy Game Loop

    - by Rikonator
    I have been experimenting with HTML5/JS, trying to create a simple game when I hit a wall. My choice of game loop is too choppy to be actually of any use in a game. I'm trying for a fixed time step loop, rendering only when required. I simply use a requestAnimationFrame to run Game.update which finds the elapsed time since the last update, and calls State.update to update and render the current state. State.prototype.update = function(ms) { this.ticks += ms; var updates = 0; while(this.ticks >= State.DELTA_TIME && updates < State.MAX_UPDATES) { this.updateState(); this.updateFrameTicks += State.DELTA_TIME; this.updateFrames++; if(this.updateFrameTicks >= 1000) { this.ups = this.updateFrames; this.updateFrames = 0; this.updateFrameTicks -= 1000; } this.ticks -= State.DELTA_TIME; updates++; } if(updates > 0) { this.renderFrameTicks += updates*State.DELTA_TIME; this.renderFrames++; if(this.renderFrameTicks >= 1000) { this.rps = this.renderFrames; this.renderFrames = 0; this.renderFrameTicks -= 1000; } this.renderState(updates*State.DELTA_TIME); } }; But this strategy does not work very well. This is the result: http://jsbin.com/ukosuc/1 (Edit). As it is apparent, the 'game' has fits of lag, and when you tab out for a long period and come back, the 'game' behaves unexpectedly - updates faster than intended. This is either a problem due to something about game loops that I don't quite understand yet, or a problem due to implementation which I can't pinpoint. I haven't been able to solve this problem despite attempting several variations using setTimeout and requestAnimationFrame. (One such example is http://jsbin.com/eyarod/1/edit). Some help and insight would really be appreciated!

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  • Sprite Kit - containsPoint for SKPhysicsBody?

    - by gj15987
    I have a ball bouncing around the screen. I can pick it up and drag it onto a "bucket". When my touches finish, I use the containsPoint function to check and see if I have dropped the ball onto the bucket. This works fine, however, I actually want to check whether the ball is dropped onto the bucket node's physics body because my "bucket" is actually just an oval, and so I've applied a physics body which is the same shape as the oval, so that the white space around the oval isn't included in the physics simulation. I can't seem to find a "containsPoint" function for physics bodies. Can anyone advise on how I'd check for this? To summarise, I want to drop a node, onto a specific part of another node (or its physics body) and trigger an event. Thanks in advance.

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  • iPhone Open GL ES using FBX - How do I import animations from FBX into iPhone?

    - by Dominic Tancredi
    I've been researching this extensively. We have a game that's 90% complete, using custom game logic in iPhone 4.0. We've been asked to import a 3D model and have it animate when various events happen in the game. I've put together an OpenGL view (based on Eagl and several examples), and used Blender to import the model, as well as Jeff LeMarche's script to export the .h file. After much trial, it worked, and I was able to show a rotating model (unskinned). However, the 3d artist hadn't UV unwrapped the model, so provided me a new model, this one as a Maya file, along with animation in a FBX format, a .obj file, and .tga texture unwrapped. My question is : how can I use FBX inside OpenGL ES inside iPhone to run through animations? And what's the pipeline to get this Maya file into Blender to be able to create a .h file. I've tried the obj2opengl however the model is missing normals (did it have it in the first place?) and the skin isn't applying at all (possibly a code issue, something I think I can fix). I'm trying to use Jeff LeMarche's animation tutorial but can't figure out how to get the model files into a proper .h file for use. Any advice?

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  • Drawing an arrow cursor on user dragging in XNA/MonoGame

    - by adrin
    I am writing a touch enabled game in MonoGame (XNA-like API) and would like to display a an arrow 'cursor' as user is making a drag gesture from point A to point B. I am not sure on how to correctly approach this problem. It seems that its best to just draw a sprite from A to B and scale it as required. This would however mean it gets stretched as user continues dragging gesture in one direction. Or maybe its better to dynamically render the arrow so it looks better?

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  • Rendering with Direct3D

    - by Jamie
    Hi, I'm slightly confused about how Direct3D rendering works. Basically, as long as I render to one surface, everything is fine. But when I try rendering to multiple surfaces, it seems like everything is still rendered to one surface. I think there's something wrong with my calls. For each update cycle this is what I do 1. device-BeginScene() 2. sprite-Begin(...) ... A bunch of GetRenderTarget to store the old render target, then SetRenderTarget to set a new surface, and then things like CreateVertexBuffer, SetTexture, etc to draw on the new render target. Then resetting to the old render target. sprite-Draw([the back buffer]) (the back buffer is actually another surface, not the actual back buffer. But here it is being drawn onto the actual back buffer, I think) sprite-End() device-EndScene() device-Present(...) Also, it seems like if I mix sprite drawing and non-sprite drawing onto a surface, that first one set of render commands is executed and then the other set, rather than in order by when each command was called. If anyone could shed light on any of this, it would be much appreciated.

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  • Interpolating height on opengl quad

    - by ThePlague
    Okay I've got a quad, see picture. And want to find the height at any point in the quad, is there a way to do this accurately as bilinear interpolation doesn't work in this case. As you can see the trees trunk is well beneath the terrain and should be at the same height as the trunks around it. I know the altitude of the vertices marked by a red circle and the centre red circle is roughly where the base should be, I've also crudely added a line as that surface is not flat.

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  • DirectX9 / HLSL Shader Model 3 - Passing Doubles between Shaders

    - by P. Avery
    I need higher precision on a few values within my vertex and pixel shaders...I'm currently using floats, so I would like to use doubles...I've read that HLSL Model 4 has two functions to convert a double into two unsigned integers and back again( asuint() and asdouble() ). These functions are only supported on HLSL 4 and I am using DirectX 9 which will only compile HLSL Model 3 and below... How can I pass a double between shaders? here is implementation for HLSL 4: struct VS_INPUT { float2 v; }; struct PS_INPUT { uint a; uint b; uint c; uint d; }; PS_INPUT VertexShader( VS_INPUT Input ) { PS_INPUT Output = ( PS_INPUT )0; double2 vPos = mul( Input.v, mWorld ).xy; asuint( vPos.x, Output.a, Output.b ); asuint( vPos.y, Output.c, Output.d ); return Output; } float4 PixelShader( PS_INPUT Input ) { double2 vPos; vPos.x = asdouble( Input.a, Input.b ); vPos.y = asdouble( Input.c, Input.d ); ... return 1; }

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  • Game mechanics patterns database?

    - by Klaim
    Do you know http://tvtropes.org ? It's a kind of wiki/database with scenaristic tropes, patterns that you can find in tones of stories, in tv shows, games, books, etc. Each trope/pattern have a (funny) name and there are references to where it appears, and the other way arround : each book/game/etc. have a list of tropes that it contains. I'm looking for an equivalent but for game mechanics patterns, something like "Death is definitive", "Perfect physical control (no inertia)", "Excell table gameplay", etc. I think it would be really useful. I can't find an equivalent for game mechanics (tvtrope is oriented to scenario, not game mechanics). Do you know any?

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  • WiX installer for XNA 4.0 game?

    - by Mathias Lykkegaard Lorenzen
    I'm trying to make a quick installer for my XNA 4.0 game which should be able to install silently. I did some research and figured out that WiX would probably be best for me. I don't like the setup projects inbuilt in Visual Studio 2010, and InstallShield LE doesn't have an XNA 4.0 redistributable. So, where can I find resources on how to make a WiX installer for an XNA 4.0 game? I've tried these links, but with no luck. They are targeting a different XNA version, and I want to make sure that a silent install would be supported (while still installing all prerequisites). http://blogs.msdn.com/b/astebner/archive/2008/11/17/9115792.aspx http://xnainstaller.codeplex.com/

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  • AS3: StageWidth for BOX2D?

    - by Gabriel Meono
    I know BOX2D uses meters, and AS3 uses pixels. I'm trying to create objects which are limited to the stageWidth. If I do this variable: for (var i:int = 0; i<(stage.stageWidth); i++){...} The animation will freeze, and this output appears: TypeError: Error #1009: Cannot access a property or method of a null object reference. at Box2D.Collision::b2BroadPhase/CreateProxy() at Box2D.Collision.Shapes::b2Shape/CreateProxy() at Box2D.Dynamics::b2Body/CreateShape() at com.actionsnippet.qbox.objects::CircleObject/build() at com.actionsnippet.qbox::QuickObject/init() at com.actionsnippet.qbox::QuickObject() at com.actionsnippet.qbox.objects::CircleObject() at com.actionsnippet.qbox::QuickBox2D/create() at com.actionsnippet.qbox::QuickBox2D/addCircle() at BOX2D_Test_Tutorial_fla::MainTimeline/frame1() Does anyone know how to fix this? Full Code: [SWF(width = 350, height = 600, frameRate = 60)] import com.actionsnippet.qbox.*; var sim:QuickBox2D = new QuickBox2D(this); sim.createStageWalls(); // make a heavy circle sim.addCircle({x:3, y:3, radius:0.4, density:1}); // create a few platforms // make pins for (var i:int = 0; i<(stage.stageWidth); i++){ //End sim.addCircle({x:1 + i * 1.5, y:18, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:17, radius:0.1, density:0}); sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0}); sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0}); //Mid end sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0}); sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0}); } sim.start(); sim.mouseDrag();

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  • JavaCV IplImage to LWJGL Texture

    - by rendrag
    As a side project I've been attempting to make a dynamic display (for example a screen within a game) that shows images from my webcam. I've been messing around with JavaCV and LWJGL for the past few months and have a basic understanding of how they both work. I found this after scouring google, but I get an error that the ByteBuffer isn't big enough. IplImage img = cam.getFrame(); ByteBuffer buffer = img.asByteBuffer(); int textureID = glGenTextures(); //Generate texture ID glBindTexture(GL_TEXTURE_2D, textureID); //Bind texture ID //I don't know how much of the following is necessary //Setup wrap mode glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE); //Setup texture scaling filtering glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); //Send texture data to OpenGL - this is the line that actually does stuff and that OpenGL has a problem with glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL12.GL_BGR, GL_UNSIGNED_BYTE, buffer); That last line throws this- Exception in thread "Thread-0" java.lang.IllegalArgumentException: Number of remaining buffer elements is 144, must be at least 921600. Because at most 921600 elements can be returned, a buffer with at least 921600 elements is required, regardless of actual returned element count at org.lwjgl.BufferChecks.throwBufferSizeException(BufferChecks.java:162) at org.lwjgl.BufferChecks.checkBufferSize(BufferChecks.java:189) at org.lwjgl.BufferChecks.checkBuffer(BufferChecks.java:230) at org.lwjgl.opengl.GL11.glTexImage2D(GL11.java:2845) at tests.TextureTest.getTexture(TextureTest.java:78) at tests.TextureTest.update(TextureTest.java:43) at lib.game.AbstractGame$1.run(AbstractGame.java:52) at java.lang.Thread.run(Thread.java:679)

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  • OpenGL ES 2.0: Filtering Polygons within VBO

    - by Bunkai.Satori
    Say, I send 10 polygon pairs (one polygon pair == one 2d sprite == one rectangle == two triangles) into OpenGL ES 2.0 VBO. The 10 polygon pairs represent one animated 2D object consisting of 10 frames. The 10 frames, of course, can not be rendered all at the same time, but will be rendered in particular order to make up smooth animation. Would you have an advice, how to pick up proper polygon pair for rendering (4 vertices) inside Vertex Shader from the VBO? Creating separate VBO for each frame would end up with thousands of VBOs, which is not the right way of doing it. I use OpenGL ES 2.0, and VBOs for both Vertices and Indices.

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  • Ogre 3d and bullet physics interaction

    - by Tim
    I have been playing around with Ogre3d and trying to integrate bullet physics. I have previously somewhat successfully got this functionality working with irrlicht and bullet and I am trying to base this on what I had done there, but modifying it to fit with Ogre. It is working but not correctly and I would like some help to understand what it is I am doing wrong. I have a state system and when I enter the "gamestate" I call some functions such as setting up a basic scene, creating the physics simulation. I am doing that as follows. void GameState::enter() { ... // Setup Physics btBroadphaseInterface *BroadPhase = new btAxisSweep3(btVector3(-1000,-1000,-1000), btVector3(1000,1000,1000)); btDefaultCollisionConfiguration *CollisionConfiguration = new btDefaultCollisionConfiguration(); btCollisionDispatcher *Dispatcher = new btCollisionDispatcher(CollisionConfiguration); btSequentialImpulseConstraintSolver *Solver = new btSequentialImpulseConstraintSolver(); World = new btDiscreteDynamicsWorld(Dispatcher, BroadPhase, Solver, CollisionConfiguration); ... createScene(); } In the createScene method I add a light and try to setup a "ground" plane to act as the ground for things to collide with.. as follows. I expect there is issues with this as I get objects colliding with the ground but half way through it and they glitch around like crazy on collision. void GameState::createScene() { m_pSceneMgr->createLight("Light")->setPosition(75,75,75); // Physics // As a test we want a floor plane for things to collide with Ogre::Entity *ent; Ogre::Plane p; p.normal = Ogre::Vector3(0,1,0); p.d = 0; Ogre::MeshManager::getSingleton().createPlane( "FloorPlane", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, p, 200000, 200000, 20, 20, true, 1, 9000,9000,Ogre::Vector3::UNIT_Z); ent = m_pSceneMgr->createEntity("floor", "FloorPlane"); ent->setMaterialName("Test/Floor"); Ogre::SceneNode *node = m_pSceneMgr->getRootSceneNode()->createChildSceneNode(); node->attachObject(ent); btTransform Transform; Transform.setIdentity(); Transform.setOrigin(btVector3(0,1,0)); // Give it to the motion state btDefaultMotionState *MotionState = new btDefaultMotionState(Transform); btCollisionShape *Shape = new btStaticPlaneShape(btVector3(0,1,0),0); // Add Mass btVector3 LocalInertia; Shape->calculateLocalInertia(0, LocalInertia); // CReate the rigid body object btRigidBody *RigidBody = new btRigidBody(0, MotionState, Shape, LocalInertia); // Store a pointer to the Ogre Node so we can update it later RigidBody->setUserPointer((void *) (node)); // Add it to the physics world World->addRigidBody(RigidBody); Objects.push_back(RigidBody); m_pNumEntities++; // End Physics } I then have a method to create a cube and give it rigid body physics properties. I know there will be errors here as I get the items colliding with the ground but not with each other properly. So I would appreciate some input on what I am doing wrong. void GameState::CreateBox(const btVector3 &TPosition, const btVector3 &TScale, btScalar TMass) { Ogre::Vector3 size = Ogre::Vector3::ZERO; Ogre::Vector3 pos = Ogre::Vector3::ZERO; Ogre::Vector3 scale = Ogre::Vector3::ZERO; pos.x = TPosition.getX(); pos.y = TPosition.getY(); pos.z = TPosition.getZ(); scale.x = TScale.getX(); scale.y = TScale.getY(); scale.z = TScale.getZ(); Ogre::Entity *entity = m_pSceneMgr->createEntity( "Box" + Ogre::StringConverter::toString(m_pNumEntities), "cube.mesh"); entity->setCastShadows(true); Ogre::AxisAlignedBox boundingB = entity->getBoundingBox(); size = boundingB.getSize(); //size /= 2.0f; // Only the half needed? //size *= 0.96f; // Bullet margin is a bit bigger so we need a smaller size entity->setMaterialName("Test/Cube"); Ogre::SceneNode *node = m_pSceneMgr->getRootSceneNode()->createChildSceneNode(); node->attachObject(entity); node->setPosition(pos); //node->scale(scale); // Physics btTransform Transform; Transform.setIdentity(); Transform.setOrigin(TPosition); // Give it to the motion state btDefaultMotionState *MotionState = new btDefaultMotionState(Transform); btVector3 HalfExtents(TScale.getX()*0.5f,TScale.getY()*0.5f,TScale.getZ()*0.5f); btCollisionShape *Shape = new btBoxShape(HalfExtents); // Add Mass btVector3 LocalInertia; Shape->calculateLocalInertia(TMass, LocalInertia); // CReate the rigid body object btRigidBody *RigidBody = new btRigidBody(TMass, MotionState, Shape, LocalInertia); // Store a pointer to the Ogre Node so we can update it later RigidBody->setUserPointer((void *) (node)); // Add it to the physics world World->addRigidBody(RigidBody); Objects.push_back(RigidBody); m_pNumEntities++; } Then in the GameState::update() method which which runs every frame to handle input and render etc I call an UpdatePhysics method to update the physics simulation. void GameState::UpdatePhysics(unsigned int TDeltaTime) { World->stepSimulation(TDeltaTime * 0.001f, 60); btRigidBody *TObject; for(std::vector<btRigidBody *>::iterator it = Objects.begin(); it != Objects.end(); ++it) { // Update renderer Ogre::SceneNode *node = static_cast<Ogre::SceneNode *>((*it)->getUserPointer()); TObject = *it; // Set position btVector3 Point = TObject->getCenterOfMassPosition(); node->setPosition(Ogre::Vector3((float)Point[0], (float)Point[1], (float)Point[2])); // set rotation btVector3 EulerRotation; QuaternionToEuler(TObject->getOrientation(), EulerRotation); node->setOrientation(1,(Ogre::Real)EulerRotation[0], (Ogre::Real)EulerRotation[1], (Ogre::Real)EulerRotation[2]); //node->rotate(Ogre::Vector3(EulerRotation[0], EulerRotation[1], EulerRotation[2])); } } void GameState::QuaternionToEuler(const btQuaternion &TQuat, btVector3 &TEuler) { btScalar W = TQuat.getW(); btScalar X = TQuat.getX(); btScalar Y = TQuat.getY(); btScalar Z = TQuat.getZ(); float WSquared = W * W; float XSquared = X * X; float YSquared = Y * Y; float ZSquared = Z * Z; TEuler.setX(atan2f(2.0f * (Y * Z + X * W), -XSquared - YSquared + ZSquared + WSquared)); TEuler.setY(asinf(-2.0f * (X * Z - Y * W))); TEuler.setZ(atan2f(2.0f * (X * Y + Z * W), XSquared - YSquared - ZSquared + WSquared)); TEuler *= RADTODEG; } I seem to have issues with the cubes not colliding with each other and colliding strangely with the ground. I have tried to capture the effect with the attached image. I would appreciate any help in understanding what I have done wrong. Thanks. EDIT : Solution The following code shows the changes I made to get accurate physics. void GameState::createScene() { m_pSceneMgr->createLight("Light")->setPosition(75,75,75); // Physics // As a test we want a floor plane for things to collide with Ogre::Entity *ent; Ogre::Plane p; p.normal = Ogre::Vector3(0,1,0); p.d = 0; Ogre::MeshManager::getSingleton().createPlane( "FloorPlane", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, p, 200000, 200000, 20, 20, true, 1, 9000,9000,Ogre::Vector3::UNIT_Z); ent = m_pSceneMgr->createEntity("floor", "FloorPlane"); ent->setMaterialName("Test/Floor"); Ogre::SceneNode *node = m_pSceneMgr->getRootSceneNode()->createChildSceneNode(); node->attachObject(ent); btTransform Transform; Transform.setIdentity(); // Fixed the transform vector here for y back to 0 to stop the objects sinking into the ground. Transform.setOrigin(btVector3(0,0,0)); // Give it to the motion state btDefaultMotionState *MotionState = new btDefaultMotionState(Transform); btCollisionShape *Shape = new btStaticPlaneShape(btVector3(0,1,0),0); // Add Mass btVector3 LocalInertia; Shape->calculateLocalInertia(0, LocalInertia); // CReate the rigid body object btRigidBody *RigidBody = new btRigidBody(0, MotionState, Shape, LocalInertia); // Store a pointer to the Ogre Node so we can update it later RigidBody->setUserPointer((void *) (node)); // Add it to the physics world World->addRigidBody(RigidBody); Objects.push_back(RigidBody); m_pNumEntities++; // End Physics } void GameState::CreateBox(const btVector3 &TPosition, const btVector3 &TScale, btScalar TMass) { Ogre::Vector3 size = Ogre::Vector3::ZERO; Ogre::Vector3 pos = Ogre::Vector3::ZERO; Ogre::Vector3 scale = Ogre::Vector3::ZERO; pos.x = TPosition.getX(); pos.y = TPosition.getY(); pos.z = TPosition.getZ(); scale.x = TScale.getX(); scale.y = TScale.getY(); scale.z = TScale.getZ(); Ogre::Entity *entity = m_pSceneMgr->createEntity( "Box" + Ogre::StringConverter::toString(m_pNumEntities), "cube.mesh"); entity->setCastShadows(true); Ogre::AxisAlignedBox boundingB = entity->getBoundingBox(); // The ogre bounding box is slightly bigger so I am reducing it for // use with the rigid body. size = boundingB.getSize()*0.95f; entity->setMaterialName("Test/Cube"); Ogre::SceneNode *node = m_pSceneMgr->getRootSceneNode()->createChildSceneNode(); node->attachObject(entity); node->setPosition(pos); node->showBoundingBox(true); //node->scale(scale); // Physics btTransform Transform; Transform.setIdentity(); Transform.setOrigin(TPosition); // Give it to the motion state btDefaultMotionState *MotionState = new btDefaultMotionState(Transform); // I got the size of the bounding box above but wasn't using it to set // the size for the rigid body. This now does. btVector3 HalfExtents(size.x*0.5f,size.y*0.5f,size.z*0.5f); btCollisionShape *Shape = new btBoxShape(HalfExtents); // Add Mass btVector3 LocalInertia; Shape->calculateLocalInertia(TMass, LocalInertia); // CReate the rigid body object btRigidBody *RigidBody = new btRigidBody(TMass, MotionState, Shape, LocalInertia); // Store a pointer to the Ogre Node so we can update it later RigidBody->setUserPointer((void *) (node)); // Add it to the physics world World->addRigidBody(RigidBody); Objects.push_back(RigidBody); m_pNumEntities++; } void GameState::UpdatePhysics(unsigned int TDeltaTime) { World->stepSimulation(TDeltaTime * 0.001f, 60); btRigidBody *TObject; for(std::vector<btRigidBody *>::iterator it = Objects.begin(); it != Objects.end(); ++it) { // Update renderer Ogre::SceneNode *node = static_cast<Ogre::SceneNode *>((*it)->getUserPointer()); TObject = *it; // Set position btVector3 Point = TObject->getCenterOfMassPosition(); node->setPosition(Ogre::Vector3((float)Point[0], (float)Point[1], (float)Point[2])); // Convert the bullet Quaternion to an Ogre quaternion btQuaternion btq = TObject->getOrientation(); Ogre::Quaternion quart = Ogre::Quaternion(btq.w(),btq.x(),btq.y(),btq.z()); // use the quaternion with setOrientation node->setOrientation(quart); } } The QuaternionToEuler function isn't needed so that was removed from code and header files. The objects now collide with the ground and each other appropriately.

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  • Transforming object world space matrix to a position in world space

    - by Fredrik Boston Westman
    Im trying to make a function for picking objects with a bounding sphere however I have run in to a problem. First I check against my my bounding sphere, then if it checks out then I test against the vertexes. I have already tested my vertex picking method and it work fine, however when I check first with my bounding sphere method it dosnt register anything. My conclusion is that when im transform my sphere position in to the position of the object in world space, the transformation goes wrong ( I base this on the fact the the x coordinate always becomes 1, even tho i translate non of my meshes along the x-axis to 1). So my question is: What is the proper way to transform a objects world space matrix to a position vector ? This is how i do it now: First i set my position vector to 0. XMVECTOR meshPos = XMVectorSet(0.0f, 0.0f, 0.0f, 0.0f); Then I trannsform it with my object space matrix, and then add the offset to the center of the mesh. meshPos = XMVector3TransformCoord(meshPos, meshWorld) + centerOffset;

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  • jBullet Collision/Physics not working correctly

    - by Kenneth Bray
    Below is the code for one of my objects in the game I am creating (yes although this is a cube, I am not making anything remotely like MineCraft), and my issue is I while the cube will display and is does follow the physics if the cube falls, it does not interact with any other objects in the game. If I was to have multiple cubes in screen at once they all just sit there, or shoot off in all directions never stopping. Anyway, I am new to jBullet, and any help would be appreciated. package Object; import static org.lwjgl.opengl.GL11.GL_QUADS; import static org.lwjgl.opengl.GL11.glBegin; import static org.lwjgl.opengl.GL11.glColor3f; import static org.lwjgl.opengl.GL11.glEnd; import static org.lwjgl.opengl.GL11.glPopMatrix; import static org.lwjgl.opengl.GL11.glPushMatrix; import static org.lwjgl.opengl.GL11.glVertex3f; import javax.vecmath.Matrix4f; import javax.vecmath.Quat4f; import javax.vecmath.Vector3f; import com.bulletphysics.collision.shapes.BoxShape; import com.bulletphysics.collision.shapes.CollisionShape; import com.bulletphysics.dynamics.RigidBody; import com.bulletphysics.dynamics.RigidBodyConstructionInfo; import com.bulletphysics.linearmath.DefaultMotionState; import com.bulletphysics.linearmath.Transform; public class Cube { // Cube size/shape variables private float size; boolean cubeCollidable; boolean cubeDestroyable; // Position variables - currently this defines the center of the cube private float posX; private float posY; private float posZ; // Rotation variables - should be between 0 and 359, might consider letting rotation go higher though I can't think of a purpose currently private float rotX; private float rotY; private float rotZ; //collision shape is a box shape CollisionShape fallShape; // setup the motion state for the ball DefaultMotionState fallMotionState; Vector3f fallInertia = new Vector3f(0, 1, 0); RigidBodyConstructionInfo fallRigidBodyCI; public RigidBody fallRigidBody; int mass = 1; // Constructor public Cube(float pX, float pY, float pZ, float pSize) { posX = pX; posY = pY; posZ = pZ; size = pSize; rotX = 0; rotY = 0; rotZ = 0; // define the physics based on the values passed in fallShape = new BoxShape(new Vector3f(size, size, size)); fallMotionState = new DefaultMotionState(new Transform(new Matrix4f(new Quat4f(0, 0, 0, 1), new Vector3f(0, 50, 0), 1f))); fallRigidBodyCI = new RigidBodyConstructionInfo(mass, fallMotionState, fallShape, fallInertia); fallRigidBody = new RigidBody(fallRigidBodyCI); } public void Update() { Transform trans = new Transform(); fallRigidBody.getMotionState().getWorldTransform(trans); posY = trans.origin.x; posX = trans.origin.y; posZ = trans.origin.z; } public void Draw() { fallShape.calculateLocalInertia(mass, fallInertia); // center point posX, posY, posZ float radius = size / 2; //top glPushMatrix(); glBegin(GL_QUADS); { glColor3f(1.0f,0.0f,0.0f); // red glVertex3f(posX + radius, posY + radius, posZ - radius); glVertex3f(posX - radius, posY + radius, posZ - radius); glVertex3f(posX - radius, posY + radius, posZ + radius); glVertex3f(posX + radius, posY + radius, posZ + radius); } glEnd(); glPopMatrix(); //bottom glPushMatrix(); glBegin(GL_QUADS); { glColor3f(1.0f,1.0f,0.0f); // ?? color glVertex3f(posX + radius, posY - radius, posZ + radius); glVertex3f(posX - radius, posY - radius, posZ + radius); glVertex3f(posX - radius, posY - radius, posZ - radius); glVertex3f(posX + radius, posY - radius, posZ - radius); } glEnd(); glPopMatrix(); //right side glPushMatrix(); glBegin(GL_QUADS); { glColor3f(1.0f,0.0f,1.0f); // ?? color glVertex3f(posX + radius, posY + radius, posZ + radius); glVertex3f(posX + radius, posY - radius, posZ + radius); glVertex3f(posX + radius, posY - radius, posZ - radius); glVertex3f(posX + radius, posY + radius, posZ - radius); } glEnd(); glPopMatrix(); //left side glPushMatrix(); glBegin(GL_QUADS); { glColor3f(0.0f,1.0f,1.0f); // ?? color glVertex3f(posX - radius, posY + radius, posZ - radius); glVertex3f(posX - radius, posY - radius, posZ - radius); glVertex3f(posX - radius, posY - radius, posZ + radius); glVertex3f(posX - radius, posY + radius, posZ + radius); } glEnd(); glPopMatrix(); //front side glPushMatrix(); glBegin(GL_QUADS); { glColor3f(0.0f,0.0f,1.0f); //blue glVertex3f(posX + radius, posY + radius, posZ + radius); glVertex3f(posX - radius, posY + radius, posZ + radius); glVertex3f(posX - radius, posY - radius, posZ + radius); glVertex3f(posX + radius, posY - radius, posZ + radius); } glEnd(); glPopMatrix(); //back side glPushMatrix(); glBegin(GL_QUADS); { glColor3f(0.0f,1.0f,0.0f); // green glVertex3f(posX + radius, posY - radius, posZ - radius); glVertex3f(posX - radius, posY - radius, posZ - radius); glVertex3f(posX - radius, posY + radius, posZ - radius); glVertex3f(posX + radius, posY + radius, posZ - radius); } glEnd(); glPopMatrix(); } }

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  • difference between cocos2d-x vs cocos2d-js

    - by MFarooqi
    I'm just moving towards native apps... A friend of mine told me to start with cocos2d, I'm good in javascript. while searching google for cocos2d, and within cocos2d-x.org i found cocos2d-x cocos2d-JSB cocos2d-html5 cocos2d-Javascript I know what cocos2d-x is for.. and what cocos2d-html5 is for.. but what is cocos2d-JSB and cocos2d-Javascript.. Can somebody please tell me.. what exactly these 2 things are.. My questions are.. Can we developer 100%pure native apps/games in cocos2d-JSB and or cocos2d-javascrpoit. I also know cocos2d-JSB is javascript bindings.. but what does that exactly mean?.. Last but not least question.. what is cocos2d-Javascript for?.. does that work alone or we need cocos2d-html5 to make it previewable in IOS/Anroid/windowsPhone.. Please give me Details.. because i'm so confused... I want to develop native apps for IOS/Android and Windows. Thank you

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  • How can I reduce draw calls when using glBufferSubData and DYNAMIC_DRAW?

    - by Kronos
    At first I had the problem where I had about 150 rectangles rendered every tick. I only used STATIC_DRAW and glBufferData. I added support for DYNAMIC_DRAW and glBufferSubData and now I have a very good result... but the number of draw calls (glDrawArrays) is the same. Best practices from Mozilla Dev website said it should be reduced, but how? Every rectangle has a method render() in which I do following (shortend): _gl.bindBuffer(WebGL.ARRAY_BUFFER, vertexBuffer); _gl.enableVertexAttribArray(a_position); _gl.vertexAttribPointer(a_position, 2, WebGL.FLOAT, false, 0, 0); _gl.bufferSubData(WebGL.ARRAY_BUFFER, 0, vertices); _gl.bindBuffer(WebGL.ARRAY_BUFFER, texCoordBuffer); _gl.enableVertexAttribArray(a_texCoordLocation); _gl.vertexAttribPointer(a_texCoordLocation, 2, WebGL.FLOAT, false, 0, 0); _gl.bufferSubData(WebGL.ARRAY_BUFFER, 0, texVertices); _gl.uniform2fv(_utranslation, _translation); _gl.uniform2fv(_urotation, _rotation); _gl.uniform2f(_location, Dart2D.WIDTH, Dart2D.HEIGHT); _gl.drawArrays(WebGL.TRIANGLES, 0, 6); So every rectangle calls drawArrays in every frame...

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  • XNA Level Select Menu

    - by user29901
    I'll try to explain this the best I can. I'm trying to create a level select menu for a game I'm making. The menu is basically a group of blocks numbered 1-16, similar to something like the Angry Birds menu. What I've done is created a cursor, basically just an outline to surround a block, that the user can move to select what level they want to play. What I want it do is move from block to block instead of simply moving around on the X and Y axes as it does now. So my question is, how can I get the cursor (highLight in the below code) to move from block to block(destinationRectangle1 etc. in the code)? /// Field for the "cursor" Vector2 highLightPos = new Vector2(400, 200); ///This is the Update code KeyboardState keyBoardState = Keyboard.GetState(); if (keyBoardState.IsKeyDown(Keys.Up)) highLightPos.Y--; if (keyBoardState.IsKeyDown(Keys.Down)) highLightPos.Y++; if (keyBoardState.IsKeyDown(Keys.Right)) highLightPos.X++; if (keyBoardState.IsKeyDown(Keys.Left)) highLightPos.X--; /// This is the draw code SpriteBatch spriteBatch = ScreenManager.SpriteBatch; Rectangle screenRectangle = new Rectangle(0, 0, 1280, 720); Rectangle destinationRectangle1 = new Rectangle(400, 200, 64, 64); Rectangle frameRectangle1 = new Rectangle(0, 0, 64, 64); Rectangle destinationRectangle2 = new Rectangle(500, 200, 64, 64); Rectangle frameRectangle2 = new Rectangle(64, 0, 64, 64); Rectangle destinationRectangle3 = new Rectangle(600, 200, 64, 64); Rectangle frameRectangle3 = new Rectangle(128, 0, 64, 64); Rectangle destinationRectangle4 = new Rectangle(700, 200, 64, 64); Rectangle frameRectangle4 = new Rectangle(192, 0, 64, 64); Rectangle destinationRectangle5 = new Rectangle(800, 200, 64, 64); Rectangle frameRectangle5 = new Rectangle(256, 0, 64, 64); Rectangle destinationRectangle6 = new Rectangle(400, 300, 64, 64); Rectangle frameRectangle6 = new Rectangle(320, 0, 64, 64); Rectangle destinationRectangle7 = new Rectangle(500, 300, 64, 64); Rectangle frameRectangle7 = new Rectangle(384, 0, 64, 64); Rectangle destinationRectangle8 = new Rectangle(600, 300, 64, 64); Rectangle frameRectangle8 = new Rectangle(448, 0, 64, 64); Rectangle destinationRectangle9 = new Rectangle(700, 300, 64, 64); Rectangle frameRectangle9 = new Rectangle(0, 64, 64, 64); Rectangle destinationRectangle10 = new Rectangle(800, 300, 64, 64); Rectangle frameRectangle10 = new Rectangle(64, 64, 64, 64); Rectangle destinationRectangle11 = new Rectangle(400, 400, 64, 64); Rectangle frameRectangle11 = new Rectangle(128, 64, 64, 64); Rectangle destinationRectangle12 = new Rectangle(500, 400, 64, 64); Rectangle frameRectangle12 = new Rectangle(192, 64, 64, 64); Rectangle destinationRectangle13 = new Rectangle(600, 400, 64, 64); Rectangle frameRectangle13 = new Rectangle(256, 64, 64, 64); Rectangle destinationRectangle14 = new Rectangle(700, 400, 64, 64); Rectangle frameRectangle14 = new Rectangle(320, 64, 64, 64); Rectangle destinationRectangle15 = new Rectangle(800, 400, 64, 64); Rectangle frameRectangle15 = new Rectangle(384, 64, 64, 64); Rectangle destinationRectangle16 = new Rectangle(600, 500, 64, 64); Rectangle frameRectangle16 = new Rectangle(448, 64, 64, 64); spriteBatch.Begin(); spriteBatch.Draw(forestBG, screenRectangle, Color.White); spriteBatch.Draw(highLight, highLightPos, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle1, frameRectangle1, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle2, frameRectangle2, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle3, frameRectangle3, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle4, frameRectangle4, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle5, frameRectangle5, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle6, frameRectangle6, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle7, frameRectangle7, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle8, frameRectangle8, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle9, frameRectangle9, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle10, frameRectangle10, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle11, frameRectangle11, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle12, frameRectangle12, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle13, frameRectangle13, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle14, frameRectangle14, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle15, frameRectangle15, Color.White); spriteBatch.Draw(levelSelectTiles, destinationRectangle16, frameRectangle16, Color.White); spriteBatch.End(); PS, I'm aware that this code is probably inefficient, cumbersome or that there's a better way to draw parts of a tile sheet. Any suggestions would be appreciated.

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  • Good Project Organization Software

    - by QAH
    Hello everyone! I am really having a hard time trying to set a schedule with development of my game. I would do better and quicker development if I had some sort of schedule to go by. What are some good programs out there, desktop or web, that allow you to easily organize your project and set development goals and milestones? I would prefer options that are free in cost, but feel free to mention non-free programs also. Thanks alot

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  • HTML5 canvas screen to isometric coordinate conversion

    - by ovhqe
    I am trying to create an isometric game using HTML5 canvas, but don't know how to convert HTML5 canvas screen coordinates to isometric coordinates. My code now is: var mouseX = 0; var mouseY = 0; function mouseCheck(event) { mouseX = event.pageX; mouseY = event.pageY; } which gives me canvas coordinates. But how do I convert these coordinates to isometric coordinates? I am using 16x16 tiles.

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  • References about Game Engine Architecture in AAA Games

    - by sharethis
    Last weeks I focused on game engine architecture and learned a lot about different approaches like component based, data driven, and so on. I used them in test applications and understand their intention but none of them looks like the holy grail. So I wonder how major games in the industry ("AAA Games") solve different architecture problems. But I noticed that there are barely references about game engine architecture out there. Do you know any resources of game engine architecture of major game titles like Battlefield, Call of Duty, Crysis, Skyrim, and so on? Doesn't matter if it is an article of a game developer or a wiki page or an entire book. I read this related popular question: Good resources for learning about game architecture? But it is focused on learning books rather than approaches in the industry. Hopefully the breadth of our community can carry together certain useful informations! Thanks a lot! Edit: This question is focused but not restricted to first person games.

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  • libgdx spite position relative to body

    - by While-E
    Apologies if this is a reiteration, as I couldn't find another discussion of this over the past couple days. Issue: I'm using libgdx and box2d, and I'm currently updating the sprite's position to the body's current position every render call. Using a debugRenderer to see the bodies, I see that there is fairly noticeable lag between the movement/position of the body and the sprite that is being moved relative to it. Question: Is this lag normal, possibly to perform collisions ahead of time? If not, should I be manipulating/relating the positions differently? Thanks in advance! [Solution] This was a coding error on my part. Pointed out by a good reply below, I was updating the position of the sprite relative to the body and then stepping the physics. Thus never actually setting the sprite to the body's CURRENT position. Thanks!

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  • How to achieve best performance in DirectX 9.0 while rendering on multiple monitors

    - by Vibhore Tanwer
    I am new to DirectX, and trying to learn best practice. Please suggest what are the best practices for rendering on multiple monitors different things at the same time? how can I boost performance of application? I have gone through this article http://msdn.microsoft.com/en-us/library/windows/desktop/bb147263%28v=vs.85%29.aspx . I am making use of some pixel shaders to achieve some effects. At most 4 effect(4 shader effects) can be applied at same time. What are the best practices to achieve best performance with DirectX 9.0. I read somewhere that DirectX 11 provides support for parallel rendering, but I am not able to get any working sample for DirectX 11.0. Please help me with this, Any help would be of great value. Thanks

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  • Render rivers in a grid.

    - by Gabriel A. Zorrilla
    I have created a random height map and now i want to create rivers. I've made an algorithm based on a* to make rivers flow from peaks to sea and now i'm in the quest of figuring out an elegant algorithm to render them. It's a 2D, square, mapgrid. The cells which the river pases has a simple integer value with this form :rivernumber && pointOrder. Ie: 10, 11, 12, 13, 14, 15, 16...1+N for the first river, 20,21,22,23...2+N for the second, etc. This is created in the map grid generation time and it's executed just once, when the world is generated. I wanted to treat each river as a vector, but there is a problem, if the same river has branches (because i put some noise to generate branches), i can not just connect the points in order. The second alternative is to generate a complex algorithm where analizes each point, checks if the next is not a branch, if so trigger another algorithm that take care of the branch then returns to the main river, etc. Very complex and inelegant. Perhaps there is a solution in the world generation algorithm or in the river rendering algorithm that is commonly used in these cases and i'm not aware of. Any tips? Thanks!!

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