cam_pos      = [-0.579227, 1.06201, 0.770039]';
cam_dir      = [0.986467, 0.00888431, -0.163717]';
cam_up       = [-0.0189628, 0.998012, -0.0601008]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.2166, -0.0829814, -1.30962]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;