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• DirectCompute information

  - by N0xus

  I've been trying to make use of the GPU as part of a project of mine. I've looked into both CUDA and OpenCL, but the lack of information showing you how to introduce these into a project is shocking. Even their dedicated forum groups are dead. So now, I'm looking into DirectCompute. From what I can tell, it's simply a new type of shader file that makes use of HLSL. My question is this, does my program (aside from being DirectX 10 / 11 ) need its structure changed? I mean, is it simply a case of creating the CS file, setting in the project like I would any other shader, and watch the magic happen? Any information on this would be appreciated.

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• Portal View/Projection Matrix near plane

  - by melak47

  For RenderToTexture/Camera based portal rendering, the basics seems simple enough. However, with a free camera, most of the time it is going to be looking at such portals at an angle: Now a regular near clipping plane will not always work here, it will either intersect with the wall the portal is sitting on, or possibly with objects in front of the wall. The desired near clipping plane would be aligned like the portal, producing a view volume more like this: or this in 3D: So here is my question: How does one construct or "truncate" a view/projection matrix to achieve such an off-camera-normal (near) clipping plane?

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• ScissorStack LIBGDX example?

  - by user36531

  I cant find a good resource/tutorial on how to do this. I would appreciate it if someone could provide a scissorstack example from an entity class. ie. using scissorstack on PlayerClass such that the map renders around the Player sprite, say 5 tiles. which would then allow me to create a Pawn class and apply same methodology to give a pawn sprite a lower number, like only rendering 1 tile around the location of the pawn.

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• failbit is being set and I can't figure out why

  - by felipedrl

  I'm writing a MIDI file loader. Everything is going fine until at some track I get a failbit exception while trying to read from file. I can't figure out why, I've checked the file size and it's ok too. Upon checking "errno" and it returns "0". Any ideas? Thanks. The snippet follows: file.read(reinterpret_cast<char*>(&mHeader.id), sizeof(MidiHeader)); mTracks = new MidiTrack[mHeader.nTracks]; for (uint i = 0; i < mHeader.nTracks; ++i) { // this read fails on 6th i. I've checked hexadecimal file and it's // ok so far. file.read(reinterpret_cast<char*>(&mTracks[i].id), sizeof(uint)); if (file.fail()) { std::cerr << errno << std::endl; massert(false); } massert(mTracks[i].id == 0x6B72544D); file.read(reinterpret_cast<char*>(&mTracks[i].size), sizeof(uint)); mTracks[i].size = swapBytes(mTracks[i].size); mTracks[i].data = new char[mTracks[i].size]; file.read(mTracks[i].data, mTracks[i].size * sizeof(char)); totalBytesRead += 8 + mTracks[i].size; massert(totalBytesRead <= fileSize); }

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• Client Side Prediction for a Look Vector

  - by Mike Sawayda

  So I am making a first person networked shooter. I am working on client-side prediction where I am predicting player position and look vectors client-side based on input messages received from the server. Right now I am only worried about the look vectors though. I am receiving the correct look vector from the server about 20 times per second and I am checking that against the look vector that I have client side. I want to interpolate the clients look vector towards the correct one that is server side over a period of time. Therefore no matter how far you are away from the servers look vector you will interpolate to it over the same amount of time. Ex. if you were 10 degrees off it would take the same amount of time as if you were 2 degrees off to be correctly lined up with the server copy. My code looks something like this but the problem is that the amount that you are changing the clients copy gets infinitesimally small so you will actually never reach the servers copy. This is because I am always calculating the difference and only moving by a percentage of that every frame. Does anyone have any suggestions on how to interpolate towards the servers copy correctly? if(rotationDiffY > ClientSideAttributes::minRotation) { if(serverRotY > clientRotY) { playerObjects[i]->collisionObject->rotation.y += (rotationDiffY * deltaTime); } else { playerObjects[i]->collisionObject->rotation.y -= (rotationDiffY deltaTime); } }

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• Algorithm for procedural city generation?

  - by Zove Games

  I am planning on making a (simple) procedural city generator using Java. I need ideas on whan algorithm to use for the layout, and the actual buildings. The city will mostly have skyscrapers, not really much complex stuff. For the layout I already have a simple algorithm implemented: Create a Map with java.awt.Point keys and Integer values. Fill it with all the points in the city's bounds with the value as -1 (unnassigned) Shuffle the map, and assign the 1st 10 of the keys IDs (from 1-10) Loop until all points have IDs: Loop though all points: Assign points next to an assigned point IDs of the point next to them, if 2 or more points border the point, then randomly choose which ID the point will get. You will end up with 10 random regions. Make roads bordering these regions. Fill the inside of each region with a randomly spaced and randomly rotated grid PROBLEM: This is not the fastest way to do it. What algorithm should I use for the layout. And what should I use to make each building's design? I don't even know how I'm going to do that yet (fractals maybe). I just need some ideas, not actual code.

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• SDL: Clipping a Sprite Sheet from Left to Right

  - by 0X1A

  I'm trying to get a sprite sheet clipped in the right order but I'm a bit stumped, every iteration I've tried has tended to be in the wrong order. This is my current implementation. Frames = (TempSurface-h / ClipHeight) * (TempSurface-w / ClipWidth); SDL_Rect Clips[Frames]; for (i = 0; i < Frames; i++) { if (i != 0 && i % (TempSurface-h / ClipHeight) == 0) ColumnIndex++; Clips[i].x = ColumnIndex * ClipWidth; Clips[i].y = i % (TempSurface-h / ClipHeight) * ClipHeight; Clips[i].w = ClipWidth; Clips[i].h = ClipHeight; Where TempSurface is the entire sheet loaded to a SDL_Surface and Clips[] is an array of SDL_Rects. What results from this is a sprite sheet set to SDL_Rects in the wrong order. For example a sheet of dimensions 4x4 would load desirably as this: | 0 | 1 | 2 | 3 | | 4 | 5 | 6 | 7 | | 8 | 9 | 10| 11| | 12| 13| 14| 15| But would be set as this order: | 0 | 4 | 8 | 12| | 1 | 5 | 9 | 13| | 2 | 6 | 10| 14| | 3 | 7 | 11| 15| What should I be doing for these to be set correctly?

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• Climbing boxes in box2D

  - by Rothens

  I've just stepped into the world of Box2D with libgdx. I've already made a stack of boxes: They are dropped randomly ontop of each other. What I'd like to achieve is to make a character, that could freely climb on the boxes, (He can grip on the boxes anywhere, not just on the side/top of a box) but his weight affects the stack as well, so the boxes could fall down. My google-fu failed me... Is there any way to make this possible?

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• Java 2D Tile Collision

  - by opiop65

  I have been working on a way to do collision detection forever, and just can't figure it out. Here's my simple 2D array: for (int x = 0; x < 16; x++) { for (int y = 0; y < 16; y++) { map[x][y] = AIR; if(map[x][y] == AIR) { air.draw(x * tilesize, y * tilesize); } } } for (int x = 0; x < 16; x++) { for (int y = 6; y < 16; y++) { map[x][y] = GRASS; if(map[x][y] == GRASS) { grass.draw(x * tilesize, y * tilesize); } } } for (int x = 0; x < 16; x++) { for (int y = 8; y < 16; y++) { map[x][y] = STONE; if(map[x][y] == STONE) { stone.draw(x * tilesize, y * tilesize); } } } I want to do it with rectangles, and using the intersect() method, but how would I go about adding rectangles to all the tiles? Edit: My player moves like this: if(input.isKeyDown(Input.KEY_W)) { shiftY -= delta * speed; idY = (int) shiftY; if(shift == true) { shiftY -= delta * runspeed; } if(isColliding == true) { shiftY += delta * speed; } } if(input.isKeyDown(Input.KEY_S)) { shiftY += delta * speed; idY = (int) shiftY; if(shift == true) { shiftY += delta * runspeed; } if(isColliding == true) { shiftY -= delta * speed; } } if (input.isKeyDown(Input.KEY_A)) { steve = left; shiftX -= delta * speed; idX = (int) shiftX; if(shift == true) { shiftX -= delta * runspeed; } if(isColliding == true) { shiftX += delta * speed; } } if (input.isKeyDown(Input.KEY_D)) { steve = right; shiftX += delta * speed; idX = (int) shiftX; if(shift == true) { shiftX += delta * runspeed; } if(isColliding == true) { shiftX -= delta * speed; } } (I have tried my own collision code, but its horrible. Doesn't work in the slightest)

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• Drawing flaming letters in 3D with OpenGL ES 2.0

  - by Chiquis

  I am a bit confused about how to achieve this. What I want is to "draw with flames". I have achieved this with textures successfully, but now my concern is about doing this with particles to achieve the flaming effect. Am I supposed to create a path along which I should add many particle emitters that will be emitting flame particles? I understand the concept for 2D, but for 3D are the particles always supposed to be facing the user? Something else I'm worried about is the performance hit that will occur by having that many particle emitters, because there can be many letters and drawings at the same time, and each of these elements will have many particle emitters. More detailed explanation: I have a path of points, which is my model. Imagine a dotted letter "S" for example. I want make the "S" be on fire. The "S" is just an example it can be a circle, triangle, a line, pretty much any path described by my set of points. For achieving this fire effect I thought about using particles. So I am using a program called "Particle Designer" to create a fire style particle emitter. This emitter looks perfect on 2D on the iphone screen dimensions. So then I thought that I could probably draw an S or any other figure if i place many particle emitters next to each other following the path described. To move from the 2D version to the 3D version I thought about, scaling the emitter (with a scale matrix multiplication in its model matrix) and then moving it to a point in my 3D world. I did this and it works. So now I have 1 particle emitter in the 3D world. My question is, is this how you would achieve a flaming letter? Is this too inefficient if i expect to have many flaming paths on my world? Am i supposed to rotate the particle's quad so that its always looking at the user? (the last one is because i noticed that if u look at it from the side the particles start to flatten out)

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• Grpahic hardwares

  - by Vanangamudi

  Which vendor provides better GPGPU. my requirements are confined to rendering utilising the GPU for BSDF building for e.g. Intel started providing Ivy Bridge chipset GPU, which are comparably fast to HD5960 cards. I'm not that against nvidia or amd. but I'm a fan of Intel. how it compares to nvidia in price and performance. if possible may I know, how all of them perform with OpenCL?? I'm not sure if it is right to ask it here. but I don't know where to ask.

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• Searching for fast skeletal animation algorithm

  - by igf

  Is it theoretically possible to dynamicaly animate scene with 100-150 400 poly characters meshes on high-end GL ES 2.0 mobile devices or i definetley should use prerendered keyframe animation? Scene have only one light source and precalculated shadow maps. View from top like in Warcraft 3. No any other meshes or objects. 2d collision detecting between objects calculated via spatial hashing. It can be any other algorithm besides ragdoll, but it must supply fast and simple skeletal animation for frame with 100+ low poly meshes for each mesh. Any ideas?

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• Need an engine for MMO mockup

  - by Kayle

  What I don't need is an MMORPG engine, at the moment. What I do need is a flexible easy-to-use engine that I can make a mock-up with. I don't need support for more than 10 players in an instance, so any multiplayer platform is probably fine. I need an engine with which I can create the following core features: Waves of simple AI enemies that have specific objectives (move to point A, destroy target, move to point B). The units present can be between 50-200 in number. An over-the-shoulder view and the ability to control a team of 3 (like Mass Effect or the latest Dragon Age) Functioning inventory system Right now, all I can really think of is Unreal or Source. Any other suggestions? Again, this is a proving mock-up, not an actual MMO. I'm not terribly worried about the visual aspects as we just want to test mechanics. Note: Can write some scripts in Python, Ruby, or Lua, if necessary.

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• Java ResourceLoader.getResourceAsStream local resource

  - by Dajgoro Labinac

  Before using lwjgl, i used the Graphic method, and there i displayed imageicons, and i had the picture file located in the resources. I used: ImageIcon tcard = new ImageIcon(this.getClass().getResource("RCA.png")); to load the image. Now when i load textures in lwjgl, i have to use absolute paths to locate the file: tcard = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("C:/RCA.png")); I tried googling, but i didn't find anything helpful... How can i load the image from the local resources like in the first example?

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• What is the most serious limitation of Unity?

  - by ashes999

  Having read this heated question about Unity vs. UDK vs. ID something, I'm curious to know: what the repeatedly-hit, most crippling limitation(s) of Unity? In order to keep this question non-subjective, again, I'm talking about the top repeated offender(s) of Unity are. This is something that, as a Unity user, you really wish someone had told you about before you started using it. I have heard from someone that Unity does not deal well with version control, since it generates a lot of binary files (which are un-diffable). This, to me, is not really crippling as I work alone. Thoughts?

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• Calculating angle between 2 vectors

  - by Error 454

  I am working on some movement AI where there are no obstacles and movement is restricted to the XY plane. I am calculating 2 vectors: v - the direction of ship 1 w - the vector pointing from the position of ship 1 to ship 2 I am then calculating the angle between these two vectors using the standard formula: arccos( v . w / ( |v| |w| ) ) The problem I'm having is the nature of arccos only returning values between 0 and 180. This makes it impossible to determine whether I should turn left or right to face the other ship. Is there a better way to do this?

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• non randomic enemy movement implementation

  - by user601836

  I would like to implement enemy movement on a X-Y grid. Would it be a good idea to have a predefined table with an initial X-Y position and a predefined "surveillance path"? Each enemy will follow its path until it detects a player, at this point it will start chasing it using a chasing algorithm. According to a friend of mine this implementation is good because the design of a good path will provide to the user a sort of reality sensation.

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• Move Camera Freely Around Object While Looking at It

  - by Alex_Hyzer_Kenoyer

  I've got a 3D model loaded (a planet) and I have a camera that I want to allow the user to move freely around it. I have no problem getting the camera to orbit the planet around either the x or y axis. My problem is when I try to move the camera on a different axis I have no idea how to go about doing it. I am using OpenGL on Android with the libGDX library. I want the camera to orbit the planet in the direction that the user swipes their finger on the screen.

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• Rendering only a part of the screen in high detail

  - by Bart van Heukelom

  If graphics are rendered for a large viewing angle (e.g. a very large TV or a VR headset), the viewer can't actually focus on the entire image, just a part of it. (Actually, this is the case for regular sized screens as well.) Combined with a way to track the viewer's eyes, you could theoretically exploit this and render the graphics away from the viewer's focus with progressively less details and resolution, gaining performance, without losing perceived quality. Are there any techniques for this available or under development today?

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• Why does unity obj import flip my x coordinate?

  - by milkplus

  When I import my wavefront obj model into unity and then draw lines over it with the same coordinates in the obj file, the x coordinate is negated. I don't see any option in the importer that might be doing that. And I'm using the same localToWorldMatrix and the same coordinate data in the .obj file. Hmmm GL.PushMatrix(); GL.MultMatrix(transform.localToWorldMatrix); CreateMaterial(); lineMaterial.SetPass(0); GL.Color(new Color(0, 1, 0)); GL.Begin(GL.LINES); GL.Vertex(p1); GL.Vertex(p2); GL.Vertex(p2); GL.Vertex(p3); //... GL.End(); GL.PopMatrix();

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• Jumping over non-stationary objects without problems ... 2-D platformer ... how could this be solved? [on hold]

  - by help bonafide pigeons

  You know this problem ... take Super Mario Bros. for example. When Mario/Luigi/etc. comes in proximity with a nearing pipe image an invisible boundary setter must prevent him from continuing forward movement. However, when you jump and move both x and y you are coordinately moving in two dimensions at an exact time. When nearing the pipe in mid-air as you are falling, i.e. implementation of gravity in the computer program "pulling" the image back down, and you do not want them to get "stuck" in both falling and moving. That problem is solved, but how about this one: The player controlling the ball object is attempting to jump and move rightwards over the non-stationary block that moves up and down. How could we measure its top and lower x+y components to determine the safest way for the ball to accurately either fall back down, or catch the ledge, or get pushed down under it, etc.?

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• Transparent parts of texture are opaque black instead

  - by Aaron

  I render a sprite twice, one on top of the other. The sprites have transparent parts, so I should be able to see the bottom sprite under the top sprite. The transparent parts are black (the clear colour) and opaque instead though and the topmost sprite blocks the bottom sprite. My fragment shader is trivial: uniform sampler2D texture; varying vec2 f_texcoord; void main() { gl_FragColor = texture2D(texture, f_texcoord); } I have glEnable(GL_BLEND) and glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) in my initialization code. My texture comes from a PNG file that I load with libpng. I'm sure to use GL_RGBA when initializing the texture with glTexImage2D (otherwise the sprites look like noise).

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• XNA: Retrieve texture file name during runtime

  - by townsean

  I'm trying to retrieve the names of the texture files (or their locations) on a mesh. I realize that the texture file name information is not preserved when the model is loaded. I've been doing tons of searching and some experimenting but I've been met with no luck. I've gathered that I need to extended the content pipeline and store the file location in somewhere like ModelMeshPart.Tag. My problem is, even when I'm trying to make my own custom processor, I still can't figure out where the texture file name is. :( Any thoughts? Thanks! UPDATE: Okay, so I found something kind of promising. NodeContent.Identity.SourceFilename, only that returns the location of my .X model. When I go down the node tree he is always null. Then there's the ContentItem.Name property. It seems to have names of my mesh, but not my actual texture file names. :(

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• How to animate the sprite along with action in Cocos2d?

  - by user1201239

  Cocos2d-android - I have an animation which has 5 Frames they are close cropped images. Now I want Sprite to do animation as well as Move in X direction.i.e. I have a player running which gets collided with obstacle and falls down .. Now I want sprite to run animation as well as moveBy in -ve x direction gameOverAnimation =CCSprite.sprite("gmovr00") gameOverAnimation.setAnchorPoint(0, 0); gameOverAnimation.setPosition(340.0f, 200.0f); addChild(gameOverAnimation,10); CCIntervalAction action1 = CCAnimate.action(mEndAnimation, false); action1.setDuration(1.0f); CCIntervalAction delay = CCDelayTime.action(0.68f); CCMoveBy actionBy = CCMoveBy.action(1.0f, CGPoint.ccp(-340,0)); CCIntervalAction seq1 = CCSpawn.actions(action1,actionBy); //CCSpawn spawn = CCSpawn.actions(action1, actionBy); CCSequence sequence1 = CCSequence.actions(seq1,CCCallFuncN.action(this,"gameOver")); gameOverAnimation.runAction(sequence1); Above code makes animation run first then moved in y direction Thanks for the help.. And can some one explaing me the concept of time with frame Animation or good example ?

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• jump pads problem

  - by Pasquale Sada

  I'm trying to make a character jump on a landing pad who stays above him. Here is the formula I've used (everything is pretty much self-explainable, maybe except character_MaxForce that is the total force the character can jump ): deltaPosition = target - character_position; sqrtTerm = Sqrt(2*-gravity.y * deltaPosition.y + MaxYVelocity* character_MaxForce); time = (MaxYVelocity-sqrtTerm) /gravity.y; speedSq = jumpVelocity.x* jumpVelocity.x + jumpVelocity.z *jumpVelocity.z; if speedSq < (character_MaxForce * character_MaxForce) we have the right time so we can store the value jumpVelocity.x = deltaPosition.x / time; jumpVelocity.z = deltaPosition.z / time; otherwise we try the other solution time = (MaxYVelocity+sqrtTerm) /gravity.y; and then store it jumpVelocity.x = deltaPosition.x / time; jumpVelocity.z = deltaPosition.z / time; jumpVelocity.y = MaxYVelocity; rigidbody_velocity = jumpVelocity; The problem is that the character is jumping away from the landing pad or sometime he jumps too far never hitting the landing pad.

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