高光照明不工作

我創建了一個3D場景，我添加了一個光源和一個3D盒子，這個盒子應該被光源照亮。 Ambient和Diffuse兩種顏色看起來都能正常工作，但鏡面顏色似乎沒有正確計算。用光源移動相機前面時，不會出現鏡面「點」。但是，當我將相機移向立方體頂部並查看原點（0,0,0）時，可以在立方體的照亮側看到微弱的鏡面「點」。高光照明不工作

我的問題是：我做錯了什麼？

以下代碼中的所有內容都發生在modelMatrix中，並且_nav成員管理相機移動。

下面的代碼：

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

glMatrixMode(GL_MODELVIEW); 
glLoadIdentity(); 
gluLookAt(_nav->getCamPosx(), _nav->getCamPosy(), _nav->getCamPosz(), 
      _nav->getCamViewx(), _nav->getCamViewy(), _nav->getCamViewz(), 
      _nav->getCamUpx(), _nav->getCamUpy(), _nav->getCamUpz()); 

glEnable(GL_LIGHTING); 
glEnable(GL_LIGHT0); 

GLfloat qaAmbientLight[] = {0.2f, 0.2f, 0.2f, 1.0f}; 
GLfloat qaDiffuseLight[] = {0.8f, 0.8f, 0.8f, 1.0f}; 
GLfloat qaSpecularLight[] = {1.0f, 0.0f, 0.0f, 1.0f}; //red for testing 
glLightfv(GL_LIGHT0, GL_AMBIENT, qaAmbientLight); 
glLightfv(GL_LIGHT0, GL_DIFFUSE, qaDiffuseLight); 
glLightfv(GL_LIGHT0, GL_SPECULAR, qaSpecularLight); 

// Set the light position 
GLfloat qaLightPosition[] = {0.5f, 0.5f, 1.2f, 1.0f}; 
glLightfv(GL_LIGHT0, GL_POSITION, qaLightPosition); 

GLfloat cyan[] = {0.f, .8f, .8f, 1.f}; 
GLfloat white[] = {0.8f, 0.8f, 0.8f, 1.0f}; 
//GLfloat dark[] = {0.0, 0.0, 0.0, 1.0}; 
glMaterialfv(GL_FRONT, GL_AMBIENT, cyan); 
glMaterialfv(GL_FRONT, GL_DIFFUSE, cyan); 
glMaterialfv(GL_FRONT, GL_SPECULAR, white); 
GLfloat shininess[] = {80}; 
glMaterialfv(GL_FRONT, GL_SHININESS, shininess); 

glBegin(GL_QUADS); 

    glNormal3f(0.0f, -1.0f, 0.0f); 
    glVertex3f(0.1f, 0.0f, 0.1f); 
    glVertex3f(1.0f, 0.0f, 0.1f); 
    glVertex3f(1.0f, 0.0f, 1.0f); 
    glVertex3f(0.1f, 0.0f, 1.0f); 

    glNormal3f(0.0f, 0.0f, -1.0f); 
    glVertex3f(0.1f, 0.0f, 0.1f); 
    glVertex3f(1.0f, 0.0f, 0.1f); 
    glVertex3f(1.0f, 1.0f, 0.1f); 
    glVertex3f(0.1f, 1.0f, 0.1f); 

    glNormal3f(-1.0f, 0.0f, 0.0f); 
    glVertex3f(0.1f, 0.0f, 0.1f); 
    glVertex3f(0.1f, 0.0f, 1.0f); 
    glVertex3f(0.1f, 1.0f, 1.0f); 
    glVertex3f(0.1f, 1.0f, 0.1f); 

    //face that gets illuminated 
    glNormal3f(0.0f, 0.0f, 1.0f); 
    glVertex3f(1.0f, 0.0f, 1.0f); 
    glVertex3f(0.1f, 0.0f, 1.0f); 
    glVertex3f(0.1f, 1.0f, 1.0f); 
    glVertex3f(1.0f, 1.0f, 1.0f); 

    glNormal3f(1.0f, 0.0f, 0.0f); 
    glVertex3f(1.0f, 0.0f, 0.1f); 
    glVertex3f(1.0f, 0.0f, 1.0f); 
    glVertex3f(1.0f, 1.0f, 1.0f); 
    glVertex3f(1.0f, 1.0f, 0.1f); 

    glNormal3f(0.0f, 1.0f, 0.0f); 
    glVertex3f(0.1f, 1.0f, 0.1f); 
    glVertex3f(1.0f, 1.0f, 0.1f); 
    glVertex3f(1.0f, 1.0f, 1.0f); 
    glVertex3f(0.1f, 1.0f, 1.0f); 

glEnd();

面對立方體側帶光源：