cam_pos      = [0.794277, 1.29884, 1.46316]';
cam_dir      = [-0.0176316, -0.001829, -0.999843]';
cam_up       = [9.27009e-05, 0.999998, -0.00183092]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.32979, 0.000166207, 0.0234498]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;