cam_pos      = [-0.178169, 1.5029, 1.48732]';
cam_dir      = [-0.93475, 0.0808121, -0.345994]';
cam_up       = [0.302424, 0.692104, -0.655387]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.248046, 0.953956, 0.892941]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;