cam_pos      = [-0.349258, 0.712373, 1.53452]';
cam_dir      = [0.880245, 0.464294, -0.0979795]';
cam_up       = [-0.40667, 0.844523, 0.348425]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.325209, 0.354916, -1.23983]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;