Unity3d coordinate and Ngui coordinate transformation

A object in the Ngui space, the parent node c,b the object in the Unity3d space. The AC render camera for CAMERA2D,B's render camera is CAMERA3D, if we want to set the A object to 10 pixels above the B object, but the A object is still in the Ngui space, it can be set as follows:

Vector3 result = Vector3.zero;

Vector3 Screen3dpos = Camera3d. Worldtoscreenpoint (b.position);

result = camera2d. Screentoworldpoint (Screen3dpos);

result.z = 0;

result = C.inversetransformpoint (result);

Result.y + = 10;

A.localpostion = result;

Unity3d coordinate and Ngui coordinate transformation