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In this example we draw a teapot using openGL/GLUT , and also we are rotating it around the y-axis as animation .

Code:
#include <GL\glut.h>

GLfloat xRotated, yRotated, zRotated;
GLdouble size=1;


void display(void)
{

    glMatrixMode(GL_MODELVIEW);
    // clear the drawing buffer.
    glClear(GL_COLOR_BUFFER_BIT);
    // clear the identity matrix.
    glLoadIdentity();
    // traslate the draw by z = -4.0
    // Note this when you decrease z like -8.0 the drawing will looks far , or smaller.
    glTranslatef(0.0,0.0,-4.5);
    // Red color used to draw.
    glColor3f(0.8, 0.2, 0.1); 
    
// changing in transformation matrix.
    // rotation about X axis
    glRotatef(xRotated,1.0,0.0,0.0);
    // rotation about Y axis
    glRotatef(yRotated,0.0,1.0,0.0);
    // rotation about Z axis
    glRotatef(zRotated,0.0,0.0,1.0);
    // scaling transfomation 
    glScalef(1.0,1.0,1.0);
    // built-in (glut library) function , draw you a Teapot.
    glutSolidTeapot(size);
    // Flush buffers to screen
     
    glFlush
();        
    
// sawp buffers called because we are using double buffering 
   // glutSwapBuffers();
}

void reshapeFunc(int x, int y)
{
    if (== 0 || x == 0) return;  //Nothing is visible then, so return
    //Set a new projection matrix
    glMatrixMode(GL_PROJECTION);  
    glLoadIdentity
();
    //Angle of view:40 degrees
    //Near clipping plane distance: 0.5
    //Far clipping plane distance: 20.0
     
    gluPerspective
(40.0,(GLdouble)x/(GLdouble)y,0.5,20.0);
 
    glViewport
(0,0,x,y);  //Use the whole window for rendering
}

void idleFunc(void)
{
 
     yRotated 
+= 0.01;
     
    display
();
}


int main (int argc, char **argv)
{
    //Initialize GLUT
    glutInit(&argc, argv);
    //double buffering used to avoid flickering problem in animation
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);  
    
// window size
    glutInitWindowSize(400,350);
    // create the window 
    glutCreateWindow("Teapot Rotating Animation");
    glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
    xRotated = yRotated = zRotated = 30.0;
     xRotated=33;
     yRotated=40;
    glClearColor(0.0,0.0,0.0,0.0);
    //Assign  the function used in events
    glutDisplayFunc(display);
   glutReshapeFunc(reshapeFunc);
    glutIdleFunc(idleFunc);
    //Let start glut loop
    glutMainLoop();
    return 0;
}

 





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