17. Backface Culling

• Simply means "Don't draw triangles that don't face the camera"

• Face culling is initially disabled

• Two steps to enable:

  
      glEnable( GL_CULL_FACE );
      glCullFace( GL_BACK );
  
  

    glCullFace() can also specify:

  
      GL_FRONT
      GL_FRONT_AND_BACK   // no faces are drawn, but other
                          // primitives such as points and lines are drawn.