cam_pos      = [0.65388, 1.44247, 1.31925]';
cam_dir      = [-0.472684, -0.194735, 0.859446]';
cam_up       = [-0.187142, 0.975215, 0.11804]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.14531, 0.139707, 0.661558]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;