物體消失/不在OPENGL的Z軸中縮放

Question

這段代碼基本上在一個圓周上圍繞中心點具有QUAD軌道。問題在於，當X旋轉精確時，它在Z軸上移動時消失，並且尺寸似乎沒有變化。它感覺像是在Orthagraphic視圖中渲染一切。

這是我的第一個OpenGL項目。

OPENGL代碼從這裏開始

 glClearColor(0.0f, 0.0f, 0.0f, 0.0f); 
     glClear(GL_COLOR_BUFFER_BIT); 
     glMatrixMode (GL_PROJECTION); 

     glPushMatrix(); 
     //glRotatef(theta, 0.0f, 0.0f, 1.0f); 
     glScalef(0.75f, 0.75f, 0.75f); 
     glTranslatef(planeX, -0.0f, 0.0f); 

     glBegin(GL_QUADS); 
      glColor3f(1.0f, 0.0f, 0.0f); glVertex3f(0.0f, 0.0f, planeZ); 
      glColor3f(0.0f, 1.0f, 0.0f); glVertex3f(0.0f, 1.0f, planeZ); 
      glColor3f(0.0f, 0.0f, 1.0f); glVertex3f(1.0f, 1.0f, planeZ); 
      glColor3f(0.0f, 0.0f, 1.0f); glVertex3f(1.0f, 0.0f, planeZ); 
     glEnd(); 

     glPopMatrix(); 

     SwapBuffers(hDC); 

     theta += 1.0f; 

     planeX = (sin(0.0314159265f*theta)); 
     planeZ = (cos(0.0314159265f*theta)); 
     Sleep (1); 

到此爲止

Answer 1

Help stamp out GL_PROJECTION abuse.