cam_pos      = [0.630029, 1.44379, 1.33331]';
cam_dir      = [-0.844697, -0.00951472, 0.53516]';
cam_up       = [-0.224962, 0.913554, -0.338838]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.645946, 0.540787, 1.02918]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;