cam_pos      = [-0.632269, 1.06639, 0.469022]';
cam_dir      = [0.995953, -0.0771855, 0.0460344]';
cam_up       = [0.0745968, 0.995667, 0.0555254]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0666605, 0.0689826, -1.32654]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;