Tagged Questions
22
votes
6answers
9k views
How can I improve rendering speeds of a Voxel/Minecraft type game?
I'm writing my own clone of Minecraft (also written in Java). It works great right now. With a viewing distance of 40 meters I can easily hit 60 FPS on my MacBook Pro 8,1. (Intel i5 + Intel HD ...
11
votes
2answers
3k views
Am I allowed to make my Minecraft clone open source?
I'm developing in my spare time a game like Minecraft. In fact, it isn't "like Minecraft", because I'm trying to make it a close as possible copy of it (meant as exercise for myself at the age of 16 ...
10
votes
3answers
8k views
How can I make OpenGL textures scale without becoming blurry?
I'm using OpenGL through LWJGL.
I have a 16x16 textured quad rendering at 16x16. When I change it's scale amount, the quad grows, then becomes blurrier as it gets larger.
How can I make it scale ...
10
votes
1answer
8k views
Making a HUD/GUI with OpenGL (LWJGL)
I'm at the stage in my game development where I need to make a HUD or GUI. I've never gotten to this part, so I don't know how its done. I tried rendering a simple quad at a fixed position on the ...
9
votes
2answers
1k views
Rendering characters, with cut off limbs (Blender models in Java/OpenGL)
What aspects should I take into consideration for creating character animation and rendering classes if I want to be able to have detachable limbs? I've developed a detailed body system that can have ...
8
votes
2answers
571 views
What is the primary use of Vertex Buffer Objects?
From what I've read, it seems VBOs are purely for performance.
I'm working on a very rudimentary learning project in lwjgl and I'm just trying to figure out what more advanced features of the library ...
6
votes
2answers
5k views
How do you determine which object/surface the user's pointing at with lwjgl?
Title pretty much says it all. I'm working on a simple 'lets get used to lwjgl' project involving manipulation of a rubik's cube, and I can't figure out how to tell which side/square the user's ...
6
votes
1answer
2k views
How to invert background pixel's color
I'm writing a game and map editor using Java and jMonkeyEngine. In the map editor, I've got a brush done by wireframed sphere. My problem is: I want to make it visible everywhere, so I want to invert ...
6
votes
2answers
510 views
An odd performance problem rendering a simple scene (less than 14k vertices) in OpenGL using two vbos with LWJGL
Problem
I have been having a strange degrading performance issue rendering a simple scene containing two "chunks" of 4x4x4 cubes each.
Video of problem
This is a screen capture showing my console ...
6
votes
1answer
4k views
Making a camera in a 2D game (glOrtho)
I'm trying to make a camera that follows my character and it seems I've managed. However, I don't know how to limit that my camera don't follow me when my character reachs the boundaries of the ...
6
votes
1answer
225 views
How to debug framerate drops with VBOs, OpenGL
I'm working on an experimental app to test how VBOs perform when rendering a minecraft-like world. If the performance is better than what I use now I'll update my actual game. Based on what everyone ...
5
votes
2answers
657 views
3D models on 2D tilemap perspective when scrolling
I am creating a small top-down game, where the player traverses a 2D tilemap, with an illusion of depth provided by 3D models for things like buildings or trees.
Having gotten to the point where I ...
5
votes
2answers
803 views
Disadvantages of using multiple versions of OpenGL in LWJGL?
So, I'm trying to figure out LWJGL, and my goal is to use OpenGL 3.2 (because pretty shaders are pretty). But in every tutorial I can find for LWJGL, they import a bunch of different OpenGL versions ...
5
votes
1answer
698 views
Particle System OpenGL (ortho)
I want to implement a particle system in my game but i have no idea where to start :S
I've never programmed a particle system, so this is my first time >.<. I only want to display pixels ...
5
votes
1answer
5k views
OpenGL: Resizing Display and glOrtho/glViewport
I have researched this question from several sources and have yet to find a firm answer saying that "yes that is correct thinking" or "no, here is how it's done."
I am trying to ensure resolution ...
5
votes
2answers
258 views
Are display lists faster than VBOs?
I'm making a voxel rendering engine. My "chunks" are 32 * 32 * 256 blocks and I can render a 16 * 16 square of them (which corresponds to Minecraft's maximal render distance). I'm using VBOs holding ...
5
votes
1answer
1k views
What's the best way of drawing a glowing 3d line using LWJGL?
Sort of like a strip-light effect; not actually a light source, but just a polygon with glowing edges.
Can this be done easily? Right now I'm contemplating drawing a line more than once with varying ...
5
votes
3answers
322 views
How do I send multiple matrices to a vertex shader?
I'm practising animations using bones/skinning. I am trying to send the shader one matrix per vertex. I can think of these two approaches.
Method 1
I have one uniform handle for each bone matrix ...
4
votes
2answers
972 views
Sprite batching in OpenGL
I've got a JAVA based game with an OpenGL rendering front that is drawing a large amount of sprites every frame (during testing it peaked at 700). Now this game is completely unoptimized. There is no ...
4
votes
2answers
4k views
Texture antialiasing?
In my Minecraft-clone style game, blocks are textured with a border that is lighter then the block color. See picture below:
To achieve this effect without the textures being blurry I use this ...
4
votes
1answer
2k views
Access vertex data stored in VBO in the shader
If I wanted to store extra data in a VBO for skinning (indices for indexing into an array of matrices of bones and floats for applying weights to those bones) How would I go about accessing that data ...
4
votes
1answer
711 views
How do I draw a full resolution texture to a window of the same resolution?
My image is 1280x800, and my screen size is 1280x800. It should draw perfectly. I'm creating a quad the size of the screen, and setting the texture to fit the quad. But right now it draws a square ...
4
votes
2answers
4k views
Starting Java 2D Platformer using LWJGL [closed]
Getting started on a 2d platforming project in java. I've decided on using LWJGL and OpenGL, but I don't quite know where to start. What is typically the first thing one would work on with a ...
4
votes
1answer
775 views
using heightmap to simulate 3d in an isometric 2d game
I saw a video of an 2.5d engine that used heightmaps to do zbuffering.
Is this hard to do? I have more or less no idea of Opengl(lwjgl) and that stuff.
I could imagine, that you compare each pixel ...
4
votes
3answers
1k views
Java and Eclipse setup properly, how do I install JOGL or LWJGL?
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 ...
4
votes
2answers
1k views
OpenGL Lighting [duplicate]
I have a simple day and night cycle by at day disabling OpenGL lighting and at night enabling openGL Lighting. When I enable everything appears darker. My question is How would I make it that at a ...
4
votes
3answers
718 views
Error when trying to use VBO “array vertex_buffer_object must be disabled to call this method”
EDIT
I have effectivley re-wrote this question in order to greatly imrpove its quality - see revision logs if you must
I have narrowed down my problem to the initialisation phase of my program, when ...
4
votes
1answer
271 views
Restricting Camera Movements with OpenGL
I've been programming a game using the Java library LWJGL. I've got a little problem, though. It is a 2D game, and I'm aiming for a game like the original Civilization (I quick Google of "Civilization ...
3
votes
2answers
208 views
How can I improve the performance of this rendering code?
I've created a practice application for rendering triangles/squares/cubes using VBOs. This is mainly so I can get it right before upgrading a 3D block world game I've written that currently is using ...
3
votes
1answer
174 views
LWJGL Eclipse Resource Deployment
I'm still experimenting with some OpenGL in LWJGL, and as I get to know more and more about OpenGL, I start to do more complicated things like multi texturing, shadowmapping and more. Now, right now ...
3
votes
1answer
462 views
How can I set the rotation of a shape to the same as my image?
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:
...
3
votes
1answer
71 views
How do you create a game overlay that makes the underlying graphics inactive?
I've created a simple game, and I drew a large rectangle in photoshop with faded edges that I want to use to overlay the game until the user presses "Begin" (on the overlay). The problem I'm currently ...
3
votes
1answer
200 views
Cut a translucent square in a texture
How to remove (cut-out) a transparent rectangle in a Texture, so that the hole will be translucent.
On Android I would use the Xfermodes approach:
...
3
votes
1answer
344 views
How do I call glVertexPointer in Java?
I'm trying to convert the following code to Java:
glVertexPointer( 3, GL_FLOAT, 0, &(mesh.m_PositionBuffer[0]) );
Where mesh::mPositionBuffer is std::vector<glm::vec3>;
How would I make ...
3
votes
3answers
2k views
Suggest a simple Java math library for matrix operations for use with OpenGL (lwjgl) [closed]
I'm writing an OpenGL app with Java. I need to do some math for camera and frustum culling (for AABB). Could you suggest a simple and fast Java math library for that?
3
votes
1answer
835 views
Ray picking - get direction from pitch and yaw
I am attempting to cast a ray from the center of the screen and check for collisions with objects.
When rendering, I use these calls to set up the camera:
GL11.glRotated(mPitch, 1, 0, 0);
...
3
votes
1answer
109 views
Convert global rotation into local rotation
I have an object in my game and I have its location, rotation and scaling in separate float[3]. The location rotation and scale are all on the global axis; these do not change based on the objects ...
3
votes
1answer
780 views
Fire simulation using java and opengl
i'm newly working with opengl. I'm trying to create a simple program that will simulate fire. My question is what are the ways other than particle effects to simulate fire. And can fire simulation ...
3
votes
1answer
11k views
Loading PNG textures for use in Android OpenGL ES1
I'm very new to Android and OpenGL coding (I have previously used ogre3d). I am trying to find an efficient way to load PNG textures. It is currently taking around 8 secs to load 3 512x512 textures ...
3
votes
1answer
978 views
State of art shadowing technique for OpenGL on isometric terrain?
What's the most efficient way of creating shadows for object on a isometric terrain with OpenGL and JOGL? Note that this terrain is not flat and is not heightmap generated. Think it as another model. ...
3
votes
1answer
216 views
Why is SpriteBatch.end() generating null pointer exception in this code?
I am getting a null pointer exception using libGDX that the debugger points as the SpriteBatch.end() line. I was wondering what would cause this.
Here is the offending code block, specifically the ...
3
votes
1answer
598 views
How to program dynamic touch events that scale according to device?
When using openGL to build a UI for my prototype I find that that I am still required to use pixels to capture touch events. To make matters worse the Android Docs make this subject slightly ...
2
votes
2answers
1k views
How should I do 3D games through Java on a mac?
I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class.
Now, I want to learn ...
2
votes
2answers
2k views
Move Camera Freely Around Object While Looking at It
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 ...
2
votes
3answers
503 views
OpenGL Get Rotated X and Y of quad
I am developing a game in 2D using LWJGL library.
So far I have a rotating box. I have done basic Rectangle collision, but it doesn't work for rotated rectangles.
Does OpenGL have a function that ...
2
votes
3answers
394 views
How can I create a spritesheet animation with big images?
If I have a 200x200 pixel sprite, and I want to create an animation for it with 30 different frames, how can I accomplish that? I can't put them on one texture/spritesheet.
2
votes
1answer
207 views
3D Camera Rotation
Please, forgive me, but I need help and I've been stuck on this for a few weeks now, I'm making no progress and everywhere I go and I see a different answer, everything I try doesn't work. I've had ...
2
votes
1answer
199 views
LibGDX strange camera behaviour
I'm currently doing my final assessment for my study Game Development. I'm currently facing a real weird (maybe explainable) result from my camera.
I just set up my scene with alot of tiles and a ...
2
votes
2answers
631 views
Checking if an object is inside bounds of an isometric chunk
How would I check if an object is inside the bounds of an isometric chunk? for example I have a player and I want to check if its inside the bounds of this isometric chunk.
I draw the isometric ...
2
votes
2answers
344 views
Ray Picking: how can I find which copy of model to pick, if they share the same vertices, but each one is translated before being drawn?
I have a scene, in which I am drawing few different objects - each one has the same vertices and each one is translated to proper place before being drawn.
While using libgdx (but I think that this ...
