glut

问题 I am using a timer function to animate, but I am having issues when I place it in the Renderer class. void Renderer::animate(int value) { glutTimerFunc(TIMERMSECS, animate, 0); } Error: \renderer.cpp(242) : error C3867: 'Renderer::animate': function call missing argument list; use '&Renderer::animate' to create a pointer to member 回答1: The issue is that Renderer::animate is a class member function and so has a hidden this parameter. glutTimerFunc doesn't know what value of this to pass, so if

问题 I am trying to obtain the Cartesian coordinates of a point for that I am using a simple function the devolves a window coordinates, something like (100,200). I want to convert this to Cartesian coordinates, the problems is that the window size is variable so I really don't know how to implement this. Edit: Op: I tried to use the guUnPorject by doing something like this GLdouble modelMatrix[16]; glGetDoublev(GL_MODELVIEW_MATRIX,modelMatrix); GLdouble projMatrix[16]; glGetDoublev(GL_PROJECTION

问题 I am trying to obtain the Cartesian coordinates of a point for that I am using a simple function the devolves a window coordinates, something like (100,200). I want to convert this to Cartesian coordinates, the problems is that the window size is variable so I really don't know how to implement this. Edit: Op: I tried to use the guUnPorject by doing something like this GLdouble modelMatrix[16]; glGetDoublev(GL_MODELVIEW_MATRIX,modelMatrix); GLdouble projMatrix[16]; glGetDoublev(GL_PROJECTION

问题 I want to compile a GLUT program #include <GL/glut.h> int main(int argc, char **argv) { // init GLUT and create Window glutInit(&argc, argv); glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); glutInitWindowPosition(100,100); glutInitWindowSize(320,320); glutCreateWindow("Lighthouse3D- GLUT Tutorial"); return 1; } Compile and link command: gcc -o main.exe main.c -lglut32 Result: main.o:main.c:(.text.startup+0x1c): undefined reference to `glutInit' main.o:main.c:(.text.startup+0x28):

问题 I'm working on a project using PyOpenGL, and I'm currently attempting to get OpenGL to render a kind of splash screen. My decided solution to this is to draw a textured 2D rectangle. Unfortunately, it appears that no matter what I do, nothing is ever drawn, I just get a black screen (So I guess something is drawn, otherwise it would be a transparent window, but it's definitely not what I want). Here is the pertinent code for my class: class ClassThing: def __init__(self): self.Splash = True

问题 i just started off using OpenGL and it seems it is not easy to understand the working of the glutMainLoop() what really happens there? Does it stay there doing nothing till any of the function calls responds? 回答1: It calls your display callback over and over, calling idle between so that it can maintain a specific framerate if possible, and others if necessary (such as if you resize the window or trigger an input event). Essentially, within this function is the main program loop, where GLUT

问题 I should have the newest version of Glew and Glut so that shouldn't be the problem. Everything should be linked, and I'm using MS visual studio 2010. My program compiles but when I get to glCreateShader(GL_FRAGMENT_SHADER) it show an error: "0xC0000005: Access violation." my program: #include <GL\glew.h> #include <GL\glut.h> #include <stdio.h> #include <stdlib.h> GLuint program; static char* readShaderSource(const char * shaderFile) { FILE* fp = fopen(shaderFile, "r"); char* buf; long size;

问题 i'm making a car race for the first time using opengl,the first problem i face is how to make the camera follow the car with constant distance..here is the code for keyboard function.V is the velocity of the car. void OnSpecial(int key, int x, int y) { float step = 5; switch(key) { case GLUT_KEY_LEFTa: carAngle = step; V.z = carAngle ; camera.Strafe(-step/2); break; case GLUT_KEY_RIGHT: carAngle = -step; V.z = carAngle ; camera.Strafe(step/2); break; case GLUT_KEY_UP: V.x += (-step); camera

问题 I'm attempting to draw text to the screen using GLUT in 2d. I want to use glutBitmapString(), can someone show me a simple example of what you have to do to setup and properly use this method in C++ so I can draw an arbitrary string at an (X,Y) position? glutBitmapString(void *font, const unsigned char *string); I'm using linux, and I know I need to create a Font object, although I'm not sure exactly how and I can supply it with the string as the second arguement. However, how do I also

问题 As per my question on Math Stackexchange: I am working on a project for my 3D Graphics class. The project is built with C++ and OpenGL / Glut. Basically, I create a horizontal rectangle window, subdivided into two squares. On the left, I have a two dimensional coordinate plane, which allows the users to point and click and define a profile 'curve'. I then need to wrap this curve around the Y-axis n number of times. So, would anyone be able to guide me as to how I would use Trigonometry to