Original Post
I was originally studying lighting. I made a blue sphere that was lit at the top to make it appear more REAL. Then I thought it would be cool if I could see the lights move. Unfortunately, the light positions are fixed (as far as i know). So, the code below tries to move the blue sphere to observe light reflections from various angles. The Problem? I use two variables x and y to store the translational values and increase or decrease them depending on the key pressed. Well, nothing is happening. You can see that i use cout<
//This is the common framework required for all GLUT programs
#include <gl/glut.h>
#include <windows.h>
#define STEP 0.05
#include <iostream>
using namespace std;
GLint Width, Height;
GLfloat x=0.0f,y=0.0f;
GLfloat diffused[]={0.0f,0.9f,0.1f,1.0f};
GLfloat ambient[]={1.0f,1.0f,1.0f,1.0f};
GLfloat lightpos[]={0.0f,1.0f,1.0f,1.0f};
void RenderScene()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(x,y,0.0f);
glColor3f(0.0f,0.0f,1.0f);
glutSolidSphere(0.5f,20,20);
glutSwapBuffers();
}
void SetupRC()
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_CULL_FACE);
glLightfv(GL_LIGHT0,GL_DIFFUSE,diffused);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambient);
glLightfv(GL_LIGHT0,GL_POSITION,lightpos);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
glColorMaterial(GL_FRONT,GL_AMBIENT);
glClearColor(0.0f,0.0f,0.0f,1.0f);
}
void TimerFunction(int value)
{
glutPostRedisplay(); //Refresh the screen
glutTimerFunc(33,TimerFunction,1);
}
void ChangeSize(int width,int height)
{
/* Save the new width and height */
Width = width;
Height = height;
/* Reset the viewport... */
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (float)width / (float)height, 0.1, 1000.0);
glMatrixMode(GL_MODELVIEW);
}
void SpecialFunction(int key,int x,int y)
{
cout<<x<<","<<y<<" ";
if(key == GLUT_KEY_UP)
y += STEP;
if(key == GLUT_KEY_DOWN)
y -= STEP;
if(key == GLUT_KEY_RIGHT)
x += STEP;
if(key == GLUT_KEY_LEFT)
x -= STEP;
glutPostRedisplay();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutCreateWindow("Simple");
glutDisplayFunc(RenderScene);
glutTimerFunc(33,TimerFunction,1);
glutSpecialFunc(SpecialFunction);
SetupRC();
glutMainLoop();
return 0;
}
