cam_pos      = [-0.163217, 1.228, 1.29127]';
cam_dir      = [0.669683, -0.0571034, -0.740449]';
cam_up       = [-0.25638, 0.917965, -0.302671]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.926995, -0.522065, -0.79814]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;