cam_pos      = [-0.59885, 0.955648, 0.0166431]';
cam_dir      = [-0.144087, 0.169637, -0.974917]';
cam_up       = [0.988793, 0.0635791, -0.135075]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0519639, 1.30799, 0.235273]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;