[opengl] Forum Topics

I was just wondering why do we exactly call glTranste command if its possible just to increase objects x, y or z. And its even stated in this tutorial: http://nehe.gamedev.net/tutorial/particle_engine_using_triangle_strips/21001/ that its even faster to only use Vertex3f() instead of resetting the Modelview Matrix. Anyways, maybe its just something particular …

So i was simply following one of the opengl tutorials - http://nehe.gamedev.net/tutorial/loading_and_moving_through_a_3d_world/22003/ So everything works completely fine except one thing, when i load in textures with SOIL lib its not completely correct, but with GLAUX lib it works just fine but i dont prefer using GLAUX. Here is what i …

It seems that i dont fully comprehend how rotation works. So leys say i have a cube and i do this: x = 90.0f; rotatef(x, 1.0f, 0.0f, 0.0f); Notice that my code here may be not all correct, its like that just to symbolize what i mean. So by doing …

I want to test some graphics work I am doing with the Utah Teapot model. The issue is that all the data I can find on it uses bezier patches (which I have no clue how to render) does anybody know how I could get the data in a form …

Hi there, I feel really stupid since I'm a beginner at OpenGL with drawing. Is there something that I'm missing in the code? The line doesn't show up on the screen. Thanks! glClearColor(1.0f, 1.0f, 1.0f, 1.0f); glBegin( GL_LINES ); glColor3f( 1.0f, 0.0f, 0.0f ); glVertex3f( 100.0f, 150.0f, 0.0f ); glVertex3f( …

Hi there, I'm sorry if this is a vague question, but I've just been assigned to create a color animation project with GLSL, and I've never really used it before. The criteria for the assignment is that the animation should depend on object coordinates, vary over time and should use …

I am wondering how to perform a 2D image blit with openGL. I used to use SDL and it was easy, but with opengl I end up making a rectangle with texture coords that is sunk a little into the screen. Is there any way to perform a 'real' blit? …

I have tries run Angry Birds Game on my laptop But it says that opengl not suppoted. I use lenovo ideapad s10 with windows 7 ultimate on it. Plz Tell me the solution how can i get opengl suppot on my laptop....

Straight to the point, I am using SOIL (http://www.lonesock.net/soil.html) library to upload images into OpenGl. Loading textures works fine but there is this thing i dont fully comprehend. Lets say I load an image into OpenGL via SOIL and I want to reuse the same image over few other textures …

I want to load a 3D model into an opengl scene. For this I've read about the .obj format and how the vertex cord's and etc are stored. I want to parse this file, but have completely no idea what soever how to begin with. After going through couple of …

I am trying to compile NeHe code for win32 app in visual studio 2010. but this error appear: [CODE]cannot convert parameter 2 from 'const char [29]' to 'LPCWSTR' 1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast[/CODE] to these instructions [ICODE] if (!wglMakeCurrent(NULL,NULL)) // Are …

So the function: [CODE]glLoadIdentity();[/CODE] resets the matrix, so for instance we do this: [CODE]glMatrixMode(GL_PROJECTION); glLoadIdentity();[/CODE] how exactly does this work, it seems that we set the matrix and then just return it to the way it used to be.

I am working on a game making (or really just general program making, but my question applies to games) DLL for opengl. It is almost done but the collision detection is a little bit slow since it has to calculate bounding boxes for each object repeatedly. I was thinking of …

I recently looked at [URL="http://www.songho.ca/opengl/gl_vbo.html"]this[/URL] description of VBOs and a sample implementation of them. When I ran the executable, it was significantly faster with no VBOs than with them. I don't understand why it should be slower with the VBOs than without. Can anybody explain why?

Hi there! I'm currently working on a school project using a Kinect device. Me and my friend decided that we wanted to create the same 3D effect as [url=http://www.youtube.com/watch?v=Jd3-eiid-Uw]this[/url] guy (Using our Kinect instead of using a Wii). We've made everything work perfectly, and we actually get a really cool …

How do you make shadows in OpenGL. I have been using the NeHe tutorials, but I do not understand their shadow lesson. Can anybody help?

Hello, I have been working with opengl and other graphics libraries and they all require the bits per pixel of the screen on initialization of a window. My question is, is there any way to get the system's preffered bits per pixel? or that of the monitor?

Hi All, I have a doubt regarding SDL programming. Can some one please help me how can i subdivide a Image lets say into 4 parts and then store them in SDL_Surface array. I intend to animate later using these subdivided images by using SDL_BlitSurface function. I am new to …

Good day, geeky guys. :cool: I have some reactions and questions about DirectX and OpenGL... Suppose (for example only,) I was hired by a big game company to spearhead game developer teams then, I want the game we will produce, to make it versatile in any computer regardless of computer …

Hi, I have a grid, which contains cells that have several different properties. [CODE]struct fluidProperties1 { float foo; float bar; };[/CODE] and I create the grid as follows using a template [CODE]Grid2D<fluidProperties1> grid1;[/CODE] Now, I want to pass the array formed only by the values of foo, and not by …

Been struggling with this the past hour, so need some help. I'm trying to light my screen with objects that already have set color values glColor3f... I've included the glColorMaterial and its enable within my lighting function however, it lights the scene with the last set color which is red …

I managed to load the bmp file into my project, but it was giving dull and hazy kind of texture for some images .. any idea as to why this is happening ??

Hi , i have just started OpenGL. So i am sorry if my question is stupid, but i was trying to move a circle inside a square and was unable to do it . .can you please help me out please ?? [CODE] #include <GL/glut.h> #include <math.h> bool* keyStates = …

Hello I already posted this on [URL="http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=306688"]opengl.org[/URL], but nobody seems to have a solution. Basically I set up Opengl and when I want to draw 3D or say I want to use the z-axis by translating in this dimension, it doesn't have any effect. What I can do, is moving …

I am using GL_TRIANGLE_STRIP to draw my terrain to the screen, however when I compile and run the program I get nothing. When I change GL_TRIANGLE_STRIP to GL_LINES it shows up and works. What can I do to get it working with GL_TRIANGLE_STRIP? here is my draw code: [CODE] void …

Ok, I found this code after searching for days, and to my delight it actually worked. It loads a TGA file into the memory... but I have no idea about how to load it into an OpenGL texture that I can use to texture a cube. I have literally spent …

I've been Programming in C++ for a year. I am done with Basics and all other OOP concepts(like inheritance,polymorphism and STL) I want to be a game programmer, but i don't know what to study now? I've heard about OpenGL, DirectX, GUI libraries as a result i m confused to …

I need help. I tried to load an image using SOIL. I was having problems with it so I found another code I am using. However, it looks like I am not loading it properly. It's simple but I think I'm confusing myself. I still can't wrap my head around …

I need to convert a true type font into a list of three dimensional vertices using openGL. I looked at the NeHe tutorial, but it only creates a display list from the font and as far as I can tell it is not possible for me to extract the vertices …

I need to know how to extract the data in a display list in opengl. I have a font and use it to create a display list to draw, but then I want to get the actual vertexes of it so I can use them for collision checking. How can …