Block 1:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   glScalef(2.0, 3.0, 1.0); 

Block 2:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   glScalef(1.0, 1.0, 1.0); 
   
   glutWireTeapot(5.0); // Teapot.

Block 3:
   // Modeling transformations.
      glTranslatef(0.0, 0.0, -15.0); 
   // glScalef(1.0, 3.0, 1.0); 
   
   glBegin(GL_LINE_LOOP);
      glVertex3f(4.0, 0.0, 0.0);
      glVertex3f(0.0, 4.0, 0.0);
      glVertex3f(-4.0, 0.0, 0.0);
      glVertex3f(0.0, -4.0, 0.0);
   glEnd();

Block 4:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0);
   glRotatef(60.0, 0.0, 0.0, 1.0);

   glutWireTeapot(5.0);

Block 5:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   glTranslatef(10.0, 0.0, 0.0); 
   glRotatef(45.0, 0.0, 0.0, 1.0);

Block 6:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0);
   glRotatef(45.0, 0.0, 0.0, 1.0);
   glTranslatef(10.0, 0.0, 0.0); 

Block 7:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   glRotatef(45.0, 0.0, 0.0, 1.0);
   glScalef(1.0, 3.0, 1.0);

Block 8:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   glScalef(1.0, 3.0, 1.0); 
   glRotatef(45.0, 0.0, 0.0, 1.0);

Block 9:
   // Modeling transformations.
   glTranslatef(0.0, 0.0, -15.0); 
   
   glTranslatef(7.5, 7.5, 0.0); // Translate back.
   glRotatef(45.0, 0.0, 0.0, 1.0); // Rotate about origin.
   glTranslatef(-7.5, -7.5, 0.0); // Translate to origin.

Block 10:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);
   glLoadIdentity(); 
   
   // Modeling transformations.	
   glTranslatef(0.0, 0.0, -15.0); 
   // glRotatef(45.0, 0.0, 0.0, 1.0);
   glTranslatef(5.0, 0.0, 0.0);

   glutWireCube(5.0); // Box.

   //More modeling transformations.
   glTranslatef (0.0, 10.0, 0.0);

   glutWireSphere (2.0, 10, 8); // Sphere.

   glFlush();
}

Block 11:
   // Modeling transformations.	
   glTranslatef(0.0, 0.0, -15.0);
   glRotatef(45.0, 0.0, 0.0, 1.0);
   glTranslatef(5.0, 0.0, 0.0); 

   glutWireCube(5.0); // Box.

   //More modeling transformations.
   glTranslatef (0.0, 10.0, 0.0);

   glutWireSphere (2.0, 10, 8); // Sphere.

Block 12:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);
   glLoadIdentity(); 

   glTranslatef(0.0, 0.0, -15.0);

   glScalef(1.0, 2.0, 1.0); 
   glutWireCube(5.0); // Box torso.

   glTranslatef(0.0, 7.0, 0.0); 
   glutWireSphere(2.0, 10, 8); // Spherical head.

   glFlush();
}

Block 13:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);
   glLoadIdentity(); 

   glTranslatef(0.0, 0.0, -15.0);

   glPushMatrix();
   glScalef(1.0, 2.0, 1.0); 
   glutWireCube(5.0); // Box.
   glPopMatrix();

   glTranslatef(0.0, 7.0, 0.0); 
   glutWireSphere(2.0, 10, 8); // Sphere.

   glFlush();
}

Block 14:
   glTranslatef(4.0, 0.0, 0.0);

   // Satellite
   glColor3f(1.0, 0.0, 0.0);
   glutWireSphere(0.5, 5, 5);

Block 15:
   glRotatef(10*latAngle, 0.0, 1.0, 0.0);
   glTranslatef(4.0, 0.0, 0.0);

   // Satellite
   glColor3f(1.0, 0.0, 0.0);
   glutWireSphere(0.5, 5, 5);

Block 16:
   // Trick code block.
   glTranslatef(4.0, 0.0, 0.0);
   glRotatef(10*latAngle, 0.0, 1.0, 0.0);
   glTranslatef(-4.0, 0.0, 0.0);
    
   glTranslatef(4.0, 0.0, 0.0);

   // Satellite.   
   glColor3f(1.0, 0.0, 0.0);
   glutWireSphere(0.5, 5, 5);

Block 17:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glLoadIdentity();

   // Place scene in frustum.
   glTranslatef(0.0, 0.0, -9.0);

   // Head.
   glColor3f(0.0, 0.0, 1.0);
   glutWireSphere(2.0, 20, 20);

   // Hat.
   glColor3f(0.0, 1.0, 0.0);
   glutWireCone(2.0, 5.0, 20, 20);
   
   glutSwapBuffers();
}

Block 18:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glLoadIdentity();

   // Place scene in frustum.
   glTranslatef(0.0, 0.0, -9.0);

   // Head.
   glColor3f(0.0, 0.0, 1.0);
   glutWireSphere(2.0, 20, 20);

   // Transformations of the hat.
   glRotatef(30.0, 0.0, 0.0, 1.0);
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   glTranslatef(0.0, 0.0, 2.0);

   // Hat.
   glColor3f(0.0, 1.0, 0.0);
   glutWireCone(2.0, 5.0, 20, 20);
   
   glutSwapBuffers();
}

Block 19:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glLoadIdentity();

   // Place scene in frustum.
   glTranslatef(0.0, 0.0, -9.0);

   // Head.
   glColor3f(0.0, 0.0, 1.0);
   glutWireSphere(2.0, 20, 20);

   // Transformations of the hat and brim.
   glRotatef(30.0, 0.0, 0.0, 1.0);
   glRotatef(-90.0, 1.0, 0.0, 0.0);
   glTranslatef(0.0, 0.0, 2.0);

   // Hat.
   glColor3f(0.0, 1.0, 0.0);
   glutWireCone(2.0, 5.0, 20, 20);

   // Brim.
   glutWireTorus(0.2, 2.2, 10, 25);

   glutSwapBuffers();
}

Block 20:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);
   glLoadIdentity(); 
   
   // Viewing transformation.
   gluLookAt(0.0, 0.0, 15.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); 

   glutWireCube(5.0); // Box.

   glFlush();
}

Block 21:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);

   glLoadIdentity(); 
   
   // Viewing transformation.
   gluLookAt(0.0, 0.0, 15.0, 15.0, 0.0, 0.0, 0.0, 1.0, 0.0);

   // Modeling transformation block equivalent
   // to the preceding viewing transformation.
   // glRotatef(45.0, 0.0, 1.0, 0.0);
   // glTranslatef(0.0, 0.0, -15.0);

   glutWireCube(5.0);

   glFlush();
}

Block 22:
void drawScene(void)
{
   glClear(GL_COLOR_BUFFER_BIT);
   glColor3f(0.0, 0.0, 0.0);

   glLoadIdentity(); 
   
   // Viewing transformation.
   gluLookAt(-30.0, 0.0, 30.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

   // Modeling transformation block equivalent
   // to the preceding viewing transformation.
   // glRotatef(45.0, 0.0, 1.0, 0.0);
   // glTranslatef(30.0, 0.0, -30.0);

   glutWireCone(3.0, 10.0, 20, 20);

   glFlush();
}