Java is both a popular programming language and runtime environment which allows Java programs to run unchanged on most hardware and software platforms.

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Removing extra blank window when adding Jmonkey based sound to Java based game

I'm currently programming a simple run and jump game in java. I'm in the process of implementing sound and I'd like to use Jmonkey's sound because I'd like to eventually switch the whole game over to ...
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0answers
48 views

Jmonkey Translucent Render Bucket fails to model object last

So I have a weapon model that moves wherever the camera moves and the rotation of the weapon is the same as the rotation of the camera. Additionally I added the weapon to the Translucency Queue Bucket ...
6
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1answer
2k views

Why do my images take 200 MB of RAM when they are ~20KB on disk?

I am creating an Android game using libGDX. When I load my nine images it takes 200 MB of RAM. But the images are 10 to 17 KB each. Why the discrepancy? Here is where I create textures from those ...
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1answer
33 views

Understanding HingeConstraint in jBullet

I'm using the java port of BulletPhysics engine jBullet. I'd like to make a joints between 2 triangles so that one edge of the first and one edge of the seconds act like a hinge. But I don't ...
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0answers
23 views

Using debugdraw in jbox2d

I've created a class which implements org.jbox2d.callbacks.DebugDraw. And implemented the abstract methods too. DebugDrawHandler extends org.jbox2d.callbacks.DebugDraw I've instanciated it with: ...
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1answer
68 views

Box2D Body creation causing performance issues

I have at max 10 dynamic bodies in my world at any time. they are created at random and fired up from below they screen. when a new body is being created, the fps falls from 59 - 61 to about 35- 40 ...
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2answers
302 views

OpenGL generate hills looking vertices

I want to generate a terrain which looks like hills. Some sort of sine waves. Should be as simple as possible. But I can not figure out how. I get very scary results, which are nothing worth. I need ...
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0answers
61 views

How to get yaw of bullet physics vehicle?

I am using the Bullet Physics port to java, JBullet, and am trying to render a vehicle body that i created in Blender on top of the vehicle chassis. Since i cannot effectively find a way to render ...
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0answers
66 views

OpenGL ES 2.0 - Applying rotation to only specific quads within a batch

This problem seems fairly simple on the face of it: How, when drawing a batch of quads using a triangle strip, can I apply a rotation to only one or some of the quads. I've been looking at this ...
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3answers
163 views

Making sprite rotate smoothly

I have a sprite that I want to rotate smoothly and face the opposite direction: This is my render function: public void render() { // Game Loop Gdx.gl.glClearColor(0.7f, 0.7f, 0.2f, 1); ...
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1answer
43 views

Making sprites move in oppsite direction of vector

I have a sprite that moves from the bottom left of the screen to the top right. What I want to know is how would i make it turn around and go in the opposite direction, and continue this loop. I ...
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3answers
145 views

Dynamic Crafting Systems [closed]

I have been toying with the idea of having a game that is based purely around crafting. That on its own is not much of a big deal. The way the crafting would work is the problem. The idea I have is ...
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2answers
155 views

Dealing with multiple scenes /levels

Overview I have a scene manager in my game and in each 'Scene' I have a render() and a update() method for drawing and updating my game's logic. Basically, when I want to switch to another scene, ...
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1answer
125 views

How to implement mouse based movement in an RPG? (Java) [duplicate]

I'm making a 2D rpg and I want the character to move with the mouse, ie the user clicks and then the character moves to that location. How do I accomplish this?
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2answers
177 views

Should FPS exceed ticks/second?

I was once told that you should never re-draw a frame if the game logic has not changed since the last draw. Assuming game logic is updated once every tick, and assuming a game runs at 40 FPS @ 20 ...
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2answers
264 views

Is object-oriented underestimated for game development? [closed]

I'd like to understand whether the object-oriented paradigm applied to game programming is bad, or whether it's just an urban legend. A friend of mine is developing a game with HTML5 and Javascript ...
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1answer
87 views

Why Is My AABB Collision Detection Not Working

I am going to be making a 3D game and I need to be able to test for accurate collision. I was able to get bounding sphere collision working (too inaccurate to be used for the whole game), but AABB ...
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1answer
192 views

How to determine the distance between a point and a rotated rectangle

This question is very similar to How do I calculate distance from a point to a rectangle?. But that question assumes that the rectangle is axis-alligned, or not rotated. So just like in that ...
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1answer
79 views

Java 2D RPG Game smart pathfinding [duplicate]

Hello I have a top down survival game where you shoot bad guys(green squares). The player can collide with certain tiles and so can the mobs but I want the mobs to go around the tile if there is a ...
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3answers
324 views

Calculating Projectile Movement

I'm having some trouble putting together a method that will constantly move a "bullet" in the same direction accurately. Here is what I have so far public Vector3f moveFromPosition(Vector3f location, ...
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votes
1answer
119 views

How to spawn multiple enemies? [closed]

I can store it in an array, ok, but after how can i paint it? Because if i do enemy = new Enemy(); enemy2 = new Enemy(); i create two istances of the object, but afer how can i paint it? I use: ...
1
vote
1answer
234 views

How would you declare a Texture object in the libgdx skin json file, using a region from a texture atlas?

I have a texture atlas that is linked to my skin.json file. The atlas contains a region named "game-title". I would like to declare a com.badlogic.gdx.graphics.Texture object in the json file, to ...
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1answer
96 views

Location of “units” in Code

So, I've been playing around with the concept of a game, mechanically think of the Civilization games(Tile, turn-based strategy) but I am quite uncertain about where I should store the units location ...
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1answer
95 views

Per vertex diffuse lighting not propogating across entire model

I'm not sure how to describe this problem so I've added a picture. When I add per vertex diffuse lighting to my model (just a field of cubes for simplicity) the lighting effect applies to each ...
2
votes
1answer
239 views

Avoiding memory allocation in Android game development

For obvious reasons, allocating memory on the fly in Android game development is not recommended. For example: http://developer.android.com/training/articles/perf-tips.html: There are two basic ...
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1answer
348 views

What is the relationship between glVertexAttribPointer index and GLSL location?

I've been getting some strange results when trying to implement a normals buffer for the purpose of rendering lighting. It seems to be related to the indexes for glEnableVertexAttribArray, ...
-1
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1answer
52 views

Screen flashing while window is open [closed]

The screen renders everything in the right place but the entire screen flickers/flashes while it's open. Any Ideas? TileMapEditor class import com.stardust.main.gfx.Assets; import java.awt.Graphics; ...
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0answers
9 views

Creating bullets at tip of rotateable object? [duplicate]

I am and not very good at trigonometry or whatever it is i'm even using. My problem is that I simply cannot figure out how to create the bullets exactly at the point of my object. The object rotates ...
0
votes
1answer
69 views

TileMap not not rendering [closed]

I have a tile map that I would like to be able to move while playing the game. In the code you will see the posX and posY variables. I used these variables so that when I complete this, I can have the ...
1
vote
1answer
80 views

Rotating an object to point towards the mouse [duplicate]

I'm using slick2d for this process and trying to rotate a minigun to face the mouse. My problem is that the minigun in my game is actually rotating but no towards the mouse at all! Also, the minigun ...
1
vote
1answer
100 views

IBO interfering with VBO data?

I have a vertex and color VBO that render a plane (2 triangles) just fine. However, when I attempt to use an IBO to render the plane, the vertices are completely off. My nice square looks all crumpled ...
0
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1answer
50 views

Using IBO's with color

I am trying to familiarize myself with IBO's by drawing triangles etc but I'm finding no way to get the color to apply properly. Can I not use an IBO to index the color values as well? I am having ...
1
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0answers
313 views

libgdx building 3D terrain

I've been spending a lot of my time working with libgdx scene 2d & have become very familiar with it. I've decided I want to move over to 3D & take a couple of weeks to learn & better ...
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0answers
69 views

Why does my texture-based object picking detect the wrong object? [closed]

I am a LibGDX beginner implementing a RISK-like game. I want to let the player select territories by clicking on them, but for some reason, the wrong territory is sometimes detected. The clicked ...
2
votes
1answer
75 views

Why do my Box2D bodies occasionally get stuck and separate forcibly?

I'm making a space game with LibGDX and Box2D. I made a video here to illustrate the issue. Verbal description: When objects collide, they sometimes get stuck together and are then suddenly separated ...
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1answer
86 views

Box2D object wont move until tons of force is used

Im making a game for android im using LibGDX and Jbox2D it is a space flying exploration game controlled with the accelerometer. so I have set the world to no have no gravity. the objects in Box2D ...
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2answers
718 views

How do I make an 8 bit sprite sheet using GIMP or Paint.NET?

I'm looking to create a sprite sheet for an 8 bit, 2D RPG I'm making. All I need to do at the moment is render in some textures. To do this, I want to make an 8x8 sprite sheet. Now, I am really bad at ...
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0answers
17 views

Projectile Motion in lwjgl with java [duplicate]

I was trying to make a game with a bow and arrow using lwjgl but I couldent get the arch right. I have a function called projectile that is updated once a frame for each arrow. my frame cap is at 60 ...
1
vote
1answer
107 views

Smooth anmiation with LibGDX

I want to move a enemy from its current position toward the mouse position in LibGDX. x, y - enemy position saveX, saveY - position where my enemy need to go(or mouse position saved at specific ...
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0answers
76 views

JBox2D Objects moving slowly (pixel to meter conversion) (SOLVED) [closed]

This problem is solved When trying to program a game using Box2D, I ran into a problem with Box2D. I filled in pixel numbers for the lengths of the the textures and sprites to create a box around it. ...
1
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2answers
363 views

How do I make a pop-up window with Scene2D?

I have a main-menu screen with a logo and a bunch of buttons. When the Login-button is pressed, I pop up a dialogue asking for a username and password. This works fine, other than the "popping up". ...
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vote
0answers
102 views

Rotating a scene around a fixed axis

I am looking for a way to move my scene so that when I translate forward/back/left right it moves directly up/down/left/right on the screen. Currently it does do that until I rotate (by anything ...
2
votes
1answer
132 views

How do I multiply two RGBA colours?

I have two RGBA integers. What procedure should I perform on them to return the multiplied colour? Do I need to split the RGBA integer into its component integers (R, G, B, A)? I'm using this for a ...
1
vote
1answer
70 views

How can I do a weighted cascade down a path in a 3D environment?

I am trying to perform a weighted cascade down a path in a 3D environment. Now, what I am trying to do is have one object(a cube) in the environment scan from its coords 1 in every direction for ...
0
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0answers
150 views

Need some guidance implementing event based game loop in JavaFX card game

i tried to make the title as much informative as possible. Anyhow, i'll try to be brief - I'm fairly new to java programming and programming altogether, after learning the basics and some advanced ...
0
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0answers
51 views

Slick 2D - how to substract two vectors?

I have two vectors:- Vector2f enemyVec = new Vector2f(enemyX, enemyY); Vector2f playerVec = new Vector2f(playerX, playerY); According to docs, I can use the "sub" method to substract two vectors ...
2
votes
1answer
110 views

Libgdx : point that scrolls on the edge of a circle

I'm not very familiar with libgdx vectors. I want to create my own joystick-controller and I want to know how can I find the coordinates of B by using Vectors. I can calculate the radius and I have ...
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0answers
134 views

How can I make a swinging rope?

Base question: How can I make a swinging rope in box2d? Context: The idea is to have a rope where the player can grab it, swing a little bit to get more "momentum" and reach the next platform. Like ...
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vote
2answers
181 views

Entity Component System: Store pointer in Component to Entity

I was wondering if it is a bad idea to store a pointer in every Component to the Entity which owns the Component. E.g. I have a Component "NPC". Each entity which owns this Component also must have ...
4
votes
4answers
813 views

Algorithm to verify if a shape is inside another

I have a rectangular canvas and I need to verify whether a shape is totally inside that canvas or not. The shape can be lines, ellipses, arcs, rectangles and arbitrary polygons. Does anyone know a ...