cam_pos      = [0.354384, 1.24447, -0.51722]';
cam_dir      = [-0.960305, -0.271617, 0.063549]';
cam_up       = [-0.272644, 0.962083, -0.00791788]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.078455, 0.0331566, 1.32727]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;