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• How do I get a collision event from a KActor subclass?

  - by Almo

  I have a subclass of KActor, and I want an event when it collides with things. event RigidBodyCollision seems to be what I want according to this http://wiki.beyondunreal.com/UE3:Actor_events_%28UDK%29#RigidBodyCollision Called when a PrimitiveComponent this Actor owns has: -bNotifyRigidBodyCollision set to true -ScriptRigidBodyCollisionThreshold greater than 0 -it is involved in a physics collision where the relative velocity exceeds ScriptRigidBodyCollisionThreshold As far as I can tell, I have these set up, and the event is not called for any collisions (KActor-KActor, KActor-world geometry, etc). Is there something else I need to do?

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• Java and Eclipse setup properly, how do I install JOGL or LWJGL?

  - by shadowprotocol

  I have my Java environment installed alongside Eclipse, and I was successfully able to create and run a new project (simple System.out.println("Yay I work!"); I have the OpenGL SuperBible, and I primarily want to code 3D things (I'll take my time using the book to learn how to draw shapes in 3D space, etc..) Can you help me get setup with OpenGL in Java? I dont really need LWJGL, although I WILL make games eventually. I just can't even figure out with all of these terrible (and old) tutorials floating around on the net how to install either JOGL or LWJGL. If you can give me a hand with that, I'd appreciate it. I'd like to feel I contributed by having this page show the answer to the question, so that other poor souls googling for this same information can benefit.

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• Multiple passes in direct3d10

  - by innochenti

  I begin to learning direct3d10 and stuck with multiple passes. As input I have a triangle(that stored in vb/ib) and effect file: //some vertex shader and globals goes there. skip them to preserve simplicity float4 ColorPixelShader(PixelInputType input) : SV_Target { return float4(1,0,0,0); } float4 ColorPixelShader1(PixelInputType input) : SV_Target { return float4(0,1,0,0); } technique10 ColorTechnique { pass pass0 { SetVertexShader(CompileShader(vs_4_0, ColorVertexShader())); SetPixelShader(CompileShader(ps_4_0, ColorPixelShader())); SetGeometryShader(NULL); } pass pass1 { SetVertexShader(CompileShader(vs_4_0, ColorVertexShader())); SetPixelShader(CompileShader(ps_4_0, ColorPixelShader1())); SetGeometryShader(NULL); } } And some render code: pass1->Apply(0); device->DrawIndexed(indexCount, 0, 0); pass2->Apply(0); device->DrawIndexed(indexCount, 0, 0); What I'd expect to see is the green triangle, but it always shows me red triangle. What am I doing wrong? Also, I've got another question - should I set vertex shader in every pass? I've added ColorVertexShader1 that translates vertex position by some delta, and 've got following picture: http://imgur.com/Oe7Qj

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• melonJS: Entity and solid block on collision layer

  - by Arthur Halma

  Actually I have my player entity with 64x64 sprite animation and 18x60 hitbox also the map is maded by 16x16 tiles. When my player goes some way he can pass through blocks (but not all of them). For example there are 4 situations: Good (player can't pass the tile with isSolid property on collision layer) Good (player can't pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Bad (player pass the tile with isSolid property on collision layer) Looks like melonJS checks only corners of hitbox instead of whole rectangle. Can anyone help me in this situation.

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• What reference point/ tutorial could I use to help me make a "Ball rolling" game in flash?

  - by user1798964

  I am a complete newbie to programming, only took high school Computer science so I kind of know what im doing, I just want to know how I can make a ball rolling game that I want to make, could anyone show me an example of a good "ball rolling game" that has good physics and everything, I have tried to use Box2D for the physics portion of the game, but I found that using that is just code and I can't figure out how to make the graphics and details of the world I want to make in my game, all I would like to do would have a game that has the collision detection and physics of box2d only apply to one ball in it and use the left and right keys to move it. sorry if I am too unclear, if anyone could show a tutorial or something to me on how to make a proper "Ball rolling" game that has good physics that would be appreciated, thank you for taking the time to read this

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• Charakter coding / programming

  - by Jery

  lately I tryed a few times to create charakters for some games, but at some certain point (especially when collision detection came in) everything became messy and the interaction between chars, the world and certain items had a lot of bugs. So here is my question, how do you ussualy keep track of actions that your charakter is allowed to do, or more in general do you have some links / advices how to set up a char efficiantly? I´m working on a char right now, who should at least be able to run, jump, pick items up and use different fighting animations. Most ideas I came up with until now use some kind of action.priority / action.duration system to determain whats possible and what not, or a "action-manager" which defines for every action what is possible from that action on but it all doesnt work that well together =\ thx in advance for some input

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• Best way to develop a level from Top down image using 3dmax

  - by fire'fly

  I have to create a game level from a top down view of an area. I used a plane converted to an editable poly to do the job. I used edges to create the top view of roads, walkways and parks so that i can extrude/edit them later. My problem is the curves in the road look blocky I tried appying mesh smooth modifier on the final model but that interfered with material mapping. Again i tried it on the plane without the extrusions and still the modifier does not work(The roads loose their shape). I know one way to solve the problem is to add more vertices on the curve and transform their location to create a more natural curve but i have a lot of curves so before doing it manually i need to know if there is a tool that refines the curves. Also i need to know if there is a better or proper way of doing the task.

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• Will there be any more books in the Game Programming Gems series?

  - by Laurent Couvidou

  It's been more than three years now that the last Game Programming Gems book was published. The official website isn't updated anymore, and this page of Mark DeLoura's website seems to imply that the series is over. Was there ever an official statement about this? Was number 8 the last book? The Game Programming Gems were one of the most (if not the most) important resource for me and probably thousands of developers around the globe, did the Internet kill them?

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• Move sprite in the direction it is facing?

  - by rphello101

  I'm using Java/Slick 2D. I'm trying to use the mouse to rotate the sprite and the arrow keys to move the sprite. I can get the sprite to rotate no problem, but I cannot get it to move in the direction it is supposed to. When I hit "forwards", the sprite doesn't necessarily move towards the mouse. I'm sure there has to be some standard code for this since many games use this style of motion. Can anyone help me out with what the trig is supposed to be? Thanks

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• How do i add a start menu page to my java game?

  - by user2149407

  I have a rather cool space invaders game that my friend and I have been working on for a while, and we have decided it needs an opening page, with "Start" options, "Quit" options and so forth. I have looked at several methods online, but cant seem to get any of them to work! Does anybody have any ideas? P.S Using JFrame to draw the main frame Im just looking to do this within Java, so just a panel that appears at a state change (GAME, MENU). Id like it to contain a few buttons to start the game, and quit. Later, I will add achievements, but im after something really basic for now. But thanks for the suggestions!

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• How do I find a unit vector of another in Java?

  - by Shijima

  I'm writing a Java formula based on this tutorial: 2-D elastic collisions without Trigonometry. I am in the section "Elastic Collisions in 2 Dimensions". Part of step 1 says: Next, find the unit vector of n, which we will call un. This is done by dividing by the magnitude of n. My below code represents the normal vector of 2 objects (I'm using a simple array to represent the normal vector). int[] normal = new int[2]; normal[0] = ball2.x - ball1.x; normal[1] = ball2.y - ball1.y; I am unsure what the tutorial means by dividing the magnitude of n to get the un. What is un? How can I calculate it with my Java array?

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• Settings object with singleton pattern

  - by axis

  I need to build an object that will have only one instance because this Object is dedicated to the storage of vital settings for my application and I would like to avoid a misuse of this type or a conflict at run-time. The most popular solution for this, according to the internet, is the Singleton pattern. But I would like to know about other ideas or solutions for this; also I would like to know if other solutions can be much more easy to grasp for an user of this hypothetical library. Thanks.

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• XNA - How do I change the texture of a 2D object?

  - by Adorjan

  I am on to make a table game, I successfully figured out how to make the arraw and to move the cursor on it (by tiles). Now I wanna find out how to make that if I hit the Enter key the tile's texture change to another. I tryed like this: if (input.KeyPressed(Keys.Enter)) { cell[X,Y].Cell_texture = tile_texture; } but it doesn't really work. Hope you can help. :) Thanks!

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• Vector normalization gives very imprecise results

  - by Kipras

  When I normalize vectors I receive very strange results. The lengths of the normalized vectors range from 1.0 to almost 1.5. The functions are all written by me, but I just can't find a mistake in my algorithm. When I normalize I just divide all components of the vector by the vector's length. public double length(){ return Math.sqrt(x*x + y*y); } public void normalize(){ if(length() > 0){ x /= length(); y /= length(); } } Is this supposed to happen? I mean I can see the length ranging from 0.9 to 1.1 at worst, but this is just overwhelming. Cheers

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• How to pause and unpause the animation of a sprite?

  - by user1609578

  My game has a sprite representing a character. When the character picks up an item, the sprite should stop moving for a period of time. I use CCbezier to make the sprite move, like this: sprite->runaction(x) Now I want the sprite to stop its current action (moving) and later resume it. I can make the sprite stop by using: sprite->stopaction(x) but if I do that, I can't resume the movement. How can I do that?

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• How to make an Image still when at position at Slick 2D?

  - by SystemNetworks

  For example, I want to put a building down. if I press 2, it will show the building near the character and it is moving with my character. I have done that. Now I wanted to know how do i put it down and stop following my character? I have something called shiftX and shiftY (Which is the position of my character) And my character looks like it is moving because the map and images itself is moving which i call, probePositionX and probePositionY.

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• How do I make a Java gave without a JFrame?

  - by kullalok

  I am working on an arcade-like game, and so far, I have been using JFrame. All the action occurs in the JFrame basically. However, I've noticed that a lot of games that you install on a computer don't have a frame. When you play them on Windows, the game covers the entire screen (the start bar disappears and you can't access any other application on your computer). I'd like to do that for my game. Is it possible to do so with Java? If so, how would I do this?

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• Can a high FPS negatively affect how a program runs?

  - by rphello101

  Yeah I know this is a broad question and will get down rated, I'm just hoping for some answer before it gets closed. Anyway, I'm using Slick 2D/Java to play around with graphics. I'm having some trouble with trying to move an image. The weird thing is, the code works just fine on my laptop, but the image sporadically moves to (0,0) and stops on my desktop. The only difference between the two is that it says the FPS is about 500 on my laptop and 6600 on my desktop. Can that affect it or does someone have any ideas for what to check on?

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• Multiple Kickstarter campaigns. Good? Bad? Ugly?

  - by BerickCook

  I've been toying with the idea of doing a Kickstarter for my game to help fund some good artists to replace the placeholder graphics I currently have. Just a small goal of $2k or so. Regardless of whether the campaign is successful this time, would it be considered a faux pas to do another, larger kickstarter once the game is looking better? Would the rewards need to be the same, or could I offer better rewards at lower donation levels for the first one as an "early adopter" bonus?

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• Saving files with libgdx

  - by Rudy_TM

  Writing my game in libgdx, i arrived at the point when i need to save the player stats and the info of the levels, but in libgdx its not allowed to write the file inside folder of the application, only external (in the sd) is allowed, well, the point is that i want that my new file cat be seen by anyone, or if they see it how can i pass it to a binary file, so no one can see it. I just want to hide the file :P

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• C++ Parallel Asynchonous task

  - by Doodlemeat

  I am currently building a randomly generated terrain game where terrain is created automatically around the player. I am experiencing lag when the generated process is active, as I am running quite heavy tasks with post-processing and creating physics bodies. Then I came to mind using a parallel asynchronous task to do the post-processing for me. But I have no idea how I am going to do that. I have searched for C++ std::async but I believe that is not what I want. In the examples I found, a task returned something. I want the task to change objects in the main program. This is what I want: // Main program // Chunks that needs to be processed. // NOTE! These chunks are already generated, but need post-processing only! std::vector<Chunk*> unprocessedChunks; And then my task could look something like this, running like a loop constantly checking if there is chunks to process. // Asynced task if(unprocessedChunks.size() > 0) { processChunk(unprocessedChunks.pop()); } I know it's not far from easy as I wrote it, but it would be a huge help for me if you could push me at the right direction. In Java, I could type something like this: asynced_task = startAsyncTask(new PostProcessTask()); And that task would run until I do this: asynced_task.cancel();

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• How can I set the rotation of a shape to the same as my image?

  - by BleedObsidian

  The way you set rotations of images is different from setting shape rotations. So how can I make the shape have the same rotation as my image? This is how my image rotates: if(input.isKeyDown(Input.KEY_RIGHT)) { rotate += rotateSpeed * delta; image.rotate(rotate - image.getRotation()); } How can I get the same effect but with a shape? For example: How can I get that rectangle to be at the same rotation as the car?

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• UDK: Toggle Material on Brushes?

  - by user50300

  I'm attempting to change / toggle the material that's applied to a BSP brush. I've seen where it's possible on static meshes, but I can't seem to get it to work on brushes. Below is an example scenario. The ground (BSP Brush) is covered in a stone material The player hits a trigger. A new "moss" material is applied to the brush, removing the old stone material. Any assistance you could offer would be greatly appreciated.

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• setting the position in different resolution

  - by Moaz

  I have a normal game window which is 640*480, and everything is fine, but when I try to maximize the window, the objects translate to different positions on the screen, for example If I have a circle which is drawn at the center in the normal window, when I try to maximize it, it shifts away from the center of the screen. How do I adjust it so it draws at the center in both normal window and maximized window ?

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• How to determine which thrusters to turn on to rotate the ship?

  - by migimunz

  The configuration of the ship changes dynamically, so I have to determine which thruster to turn on when I want to rotate the ship clockwise or counter clockwise. The thrusters are always axis aligned with the ship (never at an angle) and are either on or off. Here's one of the possible setups: What I've tried so far is to visualize the firing vector and the direction vector to the center of mass of the ship: Unfortunately, I didn't get very far with that.

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