cam_pos      = [0.662314, 1.43053, 0.0124938]';
cam_dir      = [-0.867631, -0.187861, -0.460352]';
cam_up       = [-0.0906209, 0.970114, -0.225091]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.65021, 0.204259, 1.14211]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;