cam_pos      = [0.00854059, 0.898084, 1.13297]';
cam_dir      = [0.790533, 0.557605, 0.253247]';
cam_up       = [-0.603362, 0.638276, 0.478078]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.139566, 0.705879, -1.11855]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;