OpenGL is a graphics standard and API which targets the desktop and workstation markets. It is designed to be easy to accelerate with dedicated computer hardware, and hence most implementations give greatly improved performance over traditional software rendering. Currently, OpenGL is used for ...
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votes
1answer
2k views
GluUnproject works, but only when the camera is not rotated
I am working on a very basic 3D program, my first one using OpenGL. What I am trying to do is trace a ray from the mouse's location on click which works, but only when the camera is not rotated. When ...
3
votes
4answers
2k views
OpenGL gradient banding on Samsung Galaxy S2 Android phone
I've got a live wallpaper out on the market which uses OpenGL to render some basic shapes and a flat plane. The simple lighting creates a gradient effect across the plane, which looks fine on most ...
10
votes
1answer
619 views
How do I create good looking plasma explosion effects?
Is this just a billboard quad with a bloom shader?
1
vote
1answer
2k views
Picking objects with mouse ray
I simply want to pick a few spheres in my scene using the mouse-ray. I have implemented(copied most of it but with little understanding) a ray-sphere collision code. Also I have implemented the code ...
0
votes
1answer
181 views
Style: When to call GL Enable/Disable
I'm working on an OpenGL application and some routines render textured objects, some are just colored primitives. I was wondering if there was a standard convention for how to deal with setting the ...
10
votes
3answers
1k views
Go pure OpenGL or GLSL?
I got interested in studying graphic programming so the obvious entry point was to learn OpenGL. But gathering scattered information around forums and sites, it seems that a pure OpenGL implementation ...
2
votes
2answers
2k views
How to use OpenGL's glUseProgram?
While in the rendering loop, is it OK to call glUseProgram? Does it have a big overhead? I'm planing to use a program for each different material in the scene. I'm a real beginner with OpenGL and I'm ...
-1
votes
1answer
816 views
How to make Moving road/track for android game?
I am very much new to Android game development. and i have little idea about the canvas and open GL. in one of my requirement i wanted to draw a moving road/track(Jazzy). how should i start. please ...
8
votes
3answers
2k views
How can I bend an object in OpenGL?
Is there a way one could bend an object, like a cylinder or a plane using OpenGL?
I'm an OpenGL beginner (I'm using OpenGL ES 2.0, if that matters, although I suspect, math matters most in this case, ...
-1
votes
1answer
681 views
How to create a map by coding in OpenGL
I have a very good knowledge about Java, C++, Qt, C# etc... and I wanted to start making a game... most the engine that the game per se since I don't like the "design" part of making a game..
I have ...
2
votes
1answer
157 views
How to debug pyglet/opengl bus errors
I'm using pyglet for game development, and sometimes encounter "bus errors". They are not consistently repeatable, and whenever I try to do simple debugging (eg move/remove variables, etc), the errors ...
0
votes
1answer
1k views
android game using bullet and libgdx
i'm developing a android project for school and i'm currently using libgdx for rendering. It performs quite well, but it lacks a 3d physics library. So i searched and found that Bullet physics engine ...
6
votes
1answer
714 views
How is animation handled in non-immediate OpenGL?
I'm a newbie to modern OpenGL. I'm comfortable with the immediate OpenGL methodology, but I've never done any serious use of VBOs. My question is about animation. In immediate mode, to achieve ...
1
vote
0answers
354 views
3d collision detection on non flat surface
i am developing a game which needs an accurate collision detection algorithm, when a object travels down a slope which isn't flat. To be more precise i need to simulate a skier who travels down a ...
1
vote
2answers
372 views
Chessboard colors with VBO
I am trying to draw a chessboard pattern using VBO. Geometrywise, I have it implemented and working nicely. However, I have come to the point where I want to color up the board and I have realized ...
9
votes
2answers
776 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 ...
9
votes
2answers
360 views
How does Halo draw projectiles?
I am trying to draw projectiles and doing billboarding. A projectile consists of a bill-boarded "particle" and a "tracer". When I billboard a projectile, it cannot be seen when the player's viewing ...
3
votes
3answers
6k views
How can I rotate a camera about it's target point?
I'm drawing a scene where the camera freely moves about the universe. The camera class keeps track of the view (or look at) point, the position of the camera, and the up vector. These vectors/points ...
0
votes
2answers
225 views
Is it possible to create a Facebook game that is a Windows executable?
I'm thinking of trying to make a game, and I heard Facebook is good place to make it popular, but I don't want to make a sprite-based Flash game, I want to use OpenGL for rendering to get nice ...
1
vote
2answers
476 views
Rendering (rasterization / ray tracing / others)
I'm completely new to this graphics and game development. I have read about Rendering (drawing a 3D graphic on a display 2D) and there are many ways of rendering, Rasterization, Ray tracing, ...
4
votes
1answer
760 views
How do engines like Unreal relate to OpenGL or D3D?
Well I'm completely completely new to computer graphics and even more to game development. I am searching info and all that stuff to have the basics quickly. But there's a big question mark in my ...
3
votes
1answer
1k views
Is glEnable obsolete/unneeded in OpenGL ES 2?
In an iOS app I am writing I am now culling all the GL 1 crap from my GL 2 code. Can I safely remove glEnable?
4
votes
3answers
504 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 ...
3
votes
1answer
1k views
Changing the color of some fragment of a texture using shaders
Declarative programming language QML allows to connect the elements, their properties with universal variables in shader programs description. For these purposes there is such elements as ...
4
votes
1answer
532 views
Heightmap Physics Optimization/Improvement
I'm working on implementing the physics surrounding a player walking on a heightmap. A heightmap is a grid of points which are evenly spaced on the x and z axes, with varying heights. The physical ...
1
vote
1answer
548 views
Checking Collisions In 2D Platformer With Tiles
My team and I are developing a 2D platformer with C++/SDL/OpenGL, and we already defined a collision system, but we have a problem checking collisions with the tilemap.
The tiles of the tilemap are ...
3
votes
1answer
542 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
827 views
How can I create an orthographic display that handles different screen dimensions?
I'm trying to create an iPad/iPhone game using GLES2.0 that contains a 3D scene with a heads-up-display/GUI overlaid on the top. However, this problem would also apply if I were to port my game to a ...
2
votes
1answer
600 views
Need some help implementing VBO's with Frustum Culling
i'm currently developing my first 3D game for a school project, the game world is completely inspired by minecraft (world completely made out of cubes). I'm currently seeking to improve the ...
5
votes
3answers
949 views
What features does D3D have that OpenGL does not (and vice versa)?
Are there any feature comparisons on Direct3D 11 and the newest OpenGL versions?
Well, simply put, Direct3D 11 introduced three main features (taken from Wikipedia):
Tessellation
Multithreaded ...
1
vote
1answer
431 views
How can I place a ProgressBar in Android using Cocos 2d?
I want to place a horizontal progress bar in my Android application and I want to change its progress color. I used the following code, but the progress bar is not being displayed.
CCProgressTimer ...
1
vote
0answers
1k views
OpenGL font rendering
I am trying to make an openGL text rendering class using FreeType.
I was originally following this code but it doesn't seem to work out for me. I get nothing reguardless of what parameters I put for ...
8
votes
2answers
448 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 ...
1
vote
1answer
195 views
Frame Buffer Objects vs calling TexCoord2f?
I'm learning the basics of OpenGL with lwjgl currently, and following a guide I've got textured quads that can move around a scene.
I've been reading about Frame Buffer Objects, and I'm not really ...
0
votes
1answer
921 views
matrix 4x4 position data
I understand that a 4x4 matrix holds rotation and position data.
The rotation data is held in the 3x3 sub-matrix at the top left of the matrix.
The position data is held in the last column of the ...
1
vote
0answers
76 views
reflection not being drawn [closed]
I am using stencil buffer to render reflections in my scene.I am using SDL and opengl and am using the Ubuntu environment.I get a value of 8 when I try to get the buffer size for stencil buffer so it ...
5
votes
2answers
303 views
How does this snippet of code create a ray direction vector?
In the Minecraft source code, this code is used to create a direction vector for a ray from pitch and yaw:'
float f1 = MathHelper.cos(-rotationYaw * 0.01745329F - 3.141593F);
float f3 = ...
0
votes
1answer
298 views
vector rotations for branches of a 3d tree
I'm attempting to create a 3d tree procedurally. I'm hoping that someone can check my vector rotation maths, as I'm a bit confused.
I'm using an l-system (a recursive algorithm for generating ...
0
votes
1answer
106 views
Problems in exporting terrain from autodesk 3ds
i am trying to make small counter strike sort of game and for the terrain part i have exported the terrain in 3ds format from Autodesk 3ds-max and imported the same in opengl using lib3ds. Its working ...
0
votes
0answers
195 views
sdl stencil buffer [closed]
I am trying to use the stencil buffer for rendering reflection and am working with SDL and OpenGL.
When I give the command SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,8),I get a return value of 0 ...
5
votes
2answers
750 views
Getting the number of fragments which passed the depth test
In "modern" environments, the "NV Occlusion Query" extension provides a method to get the number of fragments which passed the depth test. However, on the iPad / iPhone using OpenGL ES, the extension ...
0
votes
1answer
331 views
Refactoring an immediate drawing function into VBO, access violation error
I have a MD2 model loader, I am trying to substitute its immediate drawing function with a Vertex Buffer Object one....
I am getting a really annoying access violation reading error and I can't ...
0
votes
1answer
470 views
Toon shader with Texture. Can this be optimized?
I am quite new to OpenGL, I have managed after long trial and error to integrate Nehe's Cel-Shading rendering with my Model loaders, and have them drawn using the Toon shade and outline AND their ...
1
vote
2answers
483 views
How can I disable/dim the screen when I click the pause button?
I am working in an android game using cocos2d. I want to dim the background screen when I click the pause button.
How can I do this ?
-1
votes
3answers
1k views
Unity3D or UDK or OPENGL from scratch? [closed]
I am just very confused which I should choose in terms of high end game development. The application that I am designing is pretty simple, requires some 3D, and some effects. I am looking at a game ...
3
votes
1answer
636 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);
...
9
votes
1answer
250 views
Deforming surfaces
I try to accomplish an deforming physic behaviour for levelsurfaces, but don't get an idea how to start with the implemenation so far.
Regardless of the shape from the surface (planes, cubes, ...
2
votes
1answer
1k views
How can I write only to the stencil buffer in OpenGL ES 2.0?
I'd like to write to the stencil buffer without incurring the cost of my expensive shaders. As I understand it, I write to the stencil buffer as a 'side effect' of rendering something. In this first ...
1
vote
1answer
511 views
How can I downsample a texture using FBOs?
I am rendering a scene to FBO as my render target whose size is 8 times the size of the orignal screen in OpenGL. Now i wan to downsample the texture generated by FBO to the size of the screen so as ...
0
votes
3answers
602 views
Struggling to get set up with JOGL2.0
I did have JOGL1.1 set up and working, but I soon discovered that it did not support the latest OpenGL, so I started work on upgrading to JOGL2.0 it's not gone too well.
Firstly, is it worth me ...
