Piso y esfera

#include

GLfloat anguloCuboX = 0.0f;
GLfloat anguloCuboY = 0.0f;
GLfloat anguloEsfera = 0.0f;
GLfloat TrasEsferax= 3.0f;
GLfloat TrasEsferay= 0.0f;
GLfloat TrasEsferaz= -5.0f;

GLint ancho=400;
GLint alto=400;

int hazPerspectiva = 0;

void reshape(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
   
    if(hazPerspectiva)
 gluPerspective(60.0f, (GLfloat)width/(GLfloat)height, 1.0f, 20.0f);
    else
 glOrtho(-6,6, -6, 6, 2, 12);
    glMatrixMode(GL_MODELVIEW);

    ancho = width;
    alto = height;
}

void drawCube(void)
{
    glColor3f(0.0f, 1.0f, 1.0f);
    glBegin(GL_QUADS);       //piso
    glVertex3f( 1.0f,-1.0f, -1.0f);
    glVertex3f( 1.0f,-1.0f,  1.0f);
    glVertex3f(-1.0f,-1.0f,  1.0f);
    glVertex3f(-1.0f,-1.0f, -1.0f);
    glEnd();
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

    glTranslatef(0.0f, 0.0f, -5.0f);

   glRotatef(5, 1.0f, 0.0f, 0.0f);
   glRotatef(5, 0.0f, 1.0f, 0.0f);
    drawCube();
    glLoadIdentity();
    glTranslatef(TrasEsferax,TrasEsferay,TrasEsferaz);

    glColor3f(1.0f, 1.0f, 0.0f);
    glutWireSphere(0.3f, 6, 6);
    glFlush();
    glutSwapBuffers();

}
void init()
{
    glClearColor(0,0,0,0);
    glEnable(GL_DEPTH_TEST);
    ancho = 400;
    alto = 400;
}

void idle()
{
    display();
}

void keyboard(unsigned char key, int x, int y)
{
    switch(key)
    {
    case 'p':
    case 'P':
 hazPerspectiva=1;
 reshape(ancho,alto);
 break;

    case 'o':
    case 'O':
 hazPerspectiva=0;
 reshape(ancho,alto);
 break;
 case 'i':
    case 'I':
    TrasEsferax-=1.0;
  break;
 case 'D':
    case 'd':
    TrasEsferax+=1.0;
  break;
 case 'A':
    case 'a':
    TrasEsferay+=1.0;
  break;
 case 'B':
    case 'b':
    TrasEsferay-=1.0;
  break;
 case 'c':
    case 'C':
    TrasEsferaz+=0.5;
  break;
 
 case 'l':
    case 'L':
    TrasEsferaz-=0.5;
  break;

    }
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(ancho, alto);
    glutCreateWindow("Piso_pelota");
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutIdleFunc(idle);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
    return 0;

}