制造过程建模作业
glBegin ( GL_TRIANGLES );
glNormal3d(0, 0, 0);
//下面的三个顶点顺序要按照逆时针方向排列；
glVertex3d ( m_fCubeVertex[m_iVertexNumber + 1][0] , m_fCubeVertex[m_iVertexNumber + 1][1] , m_fCubeVertex[m_iVertexNumber + 1][2] );
glVertex3d ( m_fCubeVertex[i][0] , m_fCubeVertex[i][1] , m_fCubeVertex[i][2] );
glVertex3d ( m_fCubeVertex[i + 1][0] , m_fCubeVertex[i + 1][1] , m_fCubeVertex[i + 1][2] );
glEnd();