projects each face to the screen. It
then determines if the front side or the back side of the face is visible.
can choose not to render back faces. For
example, when outside an opaque closed surface, the back faces are never
visible as they are occluded by nearer front faces. Therefore they can be culled
that is, not rendered.
is enabled using
the side to cull is specified by glCullFace(GLenum mode)
where mode is
Culling back faces may increase
the rendering efficiency (framerate) and is enabled by default in the template.