cam_pos      = [-0.595198, 0.92987, 0.0363649]';
cam_dir      = [-0.128663, 0.168801, -0.977217]';
cam_up       = [0.99156, 0.0377758, -0.124026]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0212526, 1.30995, 0.229075]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;