cam_pos      = [0.65787, 1.44386, 1.31415]';
cam_dir      = [-0.610987, -0.195667, 0.767078]';
cam_up       = [-0.254005, 0.966195, 0.0441393]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.997213, 0.223271, 0.851244]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;